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347sbf prop size for mustang

Printed From: CorrectCraftFan.com
Category: General Correct Craft Discussion
Forum Name: General Discussion
Forum Discription: Anything Correct Craft
URL: http://www.CorrectCraftFan.com/forum/forum_posts.asp?TID=49867
Printed Date: August-04-2021 at 6:15pm


Topic: 347sbf prop size for mustang
Posted By: Mustang347
Subject: 347sbf prop size for mustang
Date Posted: June-04-2021 at 11:39pm
Trying to figure prop size for 450hp 347 on my 71 mustang with 12x15 federal



Replies:
Posted By: 8122pbrainard
Date Posted: June-05-2021 at 6:19am
Tyrone,
Send a PM or email to Billy asking him what he's running on his Mustang with a stroker. 

https://www.correctcraftfan.com/forum/member_profile.asp?PF=306" rel="nofollow - Member Profile (correctcraftfan.com)

Welcome to CCfan. 


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/diaries/details.asp?ID=1622" rel="nofollow -

54 Atom

/diaries/details.asp?ID=2179" rel="nofollow - 77 Tique

64 X55 Dunphy

Keep it original, Pete
<


Posted By: Mustang347
Date Posted: June-05-2021 at 8:07am
Thanks Peter, wanting to give this little mustang hole shot not to concerned with to speed!


Posted By: 8122pbrainard
Date Posted: June-05-2021 at 8:18am
Tyrone,
I've had the pleasure of driving Billy's stroker and trust me, his Mustang has plenty of hole shot! Big smile


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/diaries/details.asp?ID=1622" rel="nofollow -

54 Atom

/diaries/details.asp?ID=2179" rel="nofollow - 77 Tique

64 X55 Dunphy

Keep it original, Pete
<


Posted By: Mustang347
Date Posted: June-05-2021 at 8:26am
That's awesome to hear, I sent him a message with detail on what I wanted to achieve. Really excited about this setup, I had ran the worn out hmm 302 last couple years just really enjoying the boat. But it was so bad that when we started to pull motor apart we quickly seen the timing chain was so stretched in surprise it hadn't came off lol not to mention the motor was locked up when first bought, nothing marvel mystery old didn't fix 😉


Posted By: 75 Tique
Date Posted: June-05-2021 at 8:53am
Hopefully you get through but not optimistic.  Billy hasnt been on here is about 3 years.  This is going way back but last email I had for him was hobiedr@bellsouth.net.



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“So, how was your weekend?”
“Well, let me see…sun burn, stiff neck, screwed up back, assorted aches and pains….yup, my weekend was great, thanks for asking.”


Posted By: Mustang347
Date Posted: June-05-2021 at 8:56am
Ok thanks Larry, hopefully someone will chime in with some info.


Posted By: 8122pbrainard
Date Posted: June-05-2021 at 10:02am
Originally posted by 75 Tique 75 Tique wrote:

Hopefully you get through but not optimistic.  Billy hasnt been on here is about 3 years. .

Larry,
It's been two years since Billy has formally signed in but, I do know he still visits looking at the parts forum sections.  Yes, hopefully he will connect.

The other possible way is via Facebook. 


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/diaries/details.asp?ID=1622" rel="nofollow -

54 Atom

/diaries/details.asp?ID=2179" rel="nofollow - 77 Tique

64 X55 Dunphy

Keep it original, Pete
<


Posted By: KENO
Date Posted: June-05-2021 at 12:40pm
You could click on the link below to get some reading on boat dr's boat.

http://www.google.com/search?q=correctcraftfan+boat+dr+331+stroker&sxsrf=ALeKk00-2uL2rW9TLjQWWYnJGLLvGilhBg:1622911527234&ei=J6q7YNvvDe-H_QbEkrygDQ&start=0&sa=N&ved=2ahUKEwibn9TI-IDxAhXvQ98KHUQJD9Q4ChDy0wN6BAgBEDY&biw=1536&bih=722" rel="nofollow - link

It was a 331 in a 64 American Skier 

Sorta like comparing a Macintosh apple to a Gala apple. Wink

You'll find quite a bit of reading and some prop discussion too at times.


Posted By: Mustang347
Date Posted: June-05-2021 at 1:25pm
Wow oh wow, thanks Keno! That lead to so many links of good info. Think I'll stick with my 12x15 for the moment, from all I've read it came with a slightly larger pitch being the moody 302 was a 235hp/9.5comp motor. I spoke with acme and they suggested a 13x13 but I don't have clearance for it, I've only got 7/8 with current prop


Posted By: Gary S
Date Posted: June-05-2021 at 4:30pm
I don't want to put words in TRB's mouth but I seem to recall he has stated that an Acme's rake keeps the prop away from the hull ?  Maybe he will see this and comment

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http://www.correctcraftfan.com/diaries/details.asp?ID=1711&sort=&pagenum=1&yrstart=1966&yrend=1970" rel="nofollow - 69 Mustang HM SS
95 Nautique Super Sport


Posted By: TRBenj
Date Posted: June-05-2021 at 6:40pm
There are others here with 302 stroker experience in the 16’ hull. Reid has been running a pretty hot 347 in his 73 mustang for many years. I’ve got a 331 in my ‘71 Skier. Billy’s was a 331 too, btw… and he really liked a 13” diameter OJ 4-blade IIRC… which I would wholeheartedly NOT recommend for safety reasons.

12x15 OJ legend 3-blade and Acme 1214 would go to the top of the list. I would like to see some specs on how you squeaked 450hp out of a RH 302 based engine without pushing the powerband away from the useful marine range and into the auto range. If you’ve got a really wild cam and/or a lefty in there, all bets are off.



Posted By: 8122pbrainard
Date Posted: June-05-2021 at 7:05pm
Tyrone,
How about posting some pictures. I know I'd love to see some and sure others would too.

Tim brought up engine rotation but I too am curious. What rotation did you build? 


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/diaries/details.asp?ID=1622" rel="nofollow -

54 Atom

/diaries/details.asp?ID=2179" rel="nofollow - 77 Tique

64 X55 Dunphy

Keep it original, Pete
<


Posted By: Mustang347
Date Posted: June-05-2021 at 7:18pm
Thanks Trb, it's still Rh also it's a late 302 roller block. Scat balanced assembly,11.1 comp, custom comp roller cam 558 lift 112lsa, procomp heads with 5 angle valve job, cnc ported, OG boss 302 ported intake man, Og Barry Grant 825 carb with blue cones, ported Hmm aluminum exhaust. Made best power between 5800-6200, yes I know it's not a typical 44-4800 marine engine, but I like fast point A to B racing


Posted By: Mustang347
Date Posted: June-05-2021 at 7:20pm
Also this boat is just a toy, some waking boarding behind it as well as a tow swan (Swaney) lol. I have a pontoon that we cruise when it's family


Posted By: 67 ski nat
Date Posted: June-06-2021 at 12:23am
Dude this boat sounds sweet
Any chance you have video of a hole shot


Posted By: TRBenj
Date Posted: June-06-2021 at 7:47pm
You’ll have to explain the rh roller Comp… have never heard of such an animal existing. Boss intake meaning some sort of Cleveland top end? I’m confused.


Posted By: Mustang347
Date Posted: June-06-2021 at 10:49pm
67 nat, been working alot so haven't got a chance to take it out. Also Trb, competition cams will grind you whatever you, give them a call if you want something special, and as far as the boss comment. I used a original boss intake my uncle gave me due to the stock 2.36 intake runners to work with the as mentioned Pro comp heads. So no mention of anything Cleveland. The engine is a pretty basic mild build and Rh still runs as simple as Lh


Posted By: GottaSki
Date Posted: June-07-2021 at 8:51am
Pardon our curiosity because saying boss and Windsor together is like sayin jumbo shrimp, i'm not privy to this intake you remarked

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"There is nothing, absolutely nothing, half so much worthwhile as messing around with boats...simply messing."

River Rat to Mole


Posted By: Mustang347
Date Posted: June-07-2021 at 12:20pm
I tried attaching pics, but i'm unfamiliar with how to do it on this site. I'm using a Boss 302 engine intake that came on the 69-70 boss mustangs. Used they go for around 700 bucks on ebay and other forums, they have large intake runners that can't be used on stock 302 or 351w heads as such as the D0oe heads that came on my Hmm 302. I built this engine no different than the ones in my 77 f100, 78 f00, 72 Maverick, 74 vette aside from Rh vs Lh


Posted By: GottaSki
Date Posted: June-07-2021 at 1:33pm
Press the <Post Reply> to get picture options instead of using the quick reply panel

ah, so its a clevor  .   What was your exhaust solution?


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"There is nothing, absolutely nothing, half so much worthwhile as messing around with boats...simply messing."

River Rat to Mole


Posted By: KENO
Date Posted: June-07-2021 at 1:59pm
Originally posted by Mustang347 Mustang347 wrote:

I built this engine no different than the ones in my 77 f100, 78 f00, 72 Maverick, 74 vette aside from Rh vs Lh

I'm a little curious about a Boss 302 74 Corvette myself Wink


Posted By: Mustang347
Date Posted: June-07-2021 at 2:13pm
Gottaski, only Boss intake with pro comp aluminum heads with big ports.
Keno, good one but the vette packs a 454. Only chevy I own lol


Posted By: Gary S
Date Posted: June-07-2021 at 2:19pm
Originally posted by Mustang347 Mustang347 wrote:

, ported Hmm aluminum exhaust.

Can't be he's still using the HM exhaust


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http://www.correctcraftfan.com/diaries/details.asp?ID=1711&sort=&pagenum=1&yrstart=1966&yrend=1970" rel="nofollow - 69 Mustang HM SS
95 Nautique Super Sport


Posted By: Gary S
Date Posted: June-07-2021 at 2:27pm
Looks to me by these pictures that a true Boss 302 was based more on a Windsor rather than a Cleveland - notice the thermostat is mounted to the manifold like a Windsor rather than to the block of the Cleveland. http://www.boss302.com/intake.htm

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http://www.correctcraftfan.com/diaries/details.asp?ID=1711&sort=&pagenum=1&yrstart=1966&yrend=1970" rel="nofollow - 69 Mustang HM SS
95 Nautique Super Sport


Posted By: MrMcD
Date Posted: June-07-2021 at 4:58pm
Cleveland 4bbl heads had huge ports.  The true Boss 302 used those heads and made great top end power.
Ford did this to try and beat the GM 302 in the Z28 Camaro.  Those huge heads on the small engine would be weak under 4,000 RPM so prop it to spin some rpm
Not sure if you will find much power increase if you plan to run it under 5,000 rpm.




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Posted By: Mustang347
Date Posted: June-07-2021 at 5:17pm
Hit it on the Head MrMcd that's just what ford did and won the 1970 championship! Also yes big ports 2.36 height on the runners that's why I'm running cnc pro comp heads, couldn't do it with any type stock heads unless Cleveland. But also stroking it to 347 helped a lot, but yeah I could wind it to 72-7500 like the late model guys and get around 525 out of it lol


Posted By: MrMcD
Date Posted: June-08-2021 at 12:30pm
Might check to see what rpm the prop is safe to turn.  In drag boats the props are known to fail but they are pushing a lot more horsepower.

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Posted By: TRBenj
Date Posted: June-08-2021 at 2:53pm
When did you get that cam? I just called Comp to see if they had different offerings than the last time we had spoken… the tech told me they don’t have anything for a reverse rotation Ford and haven’t in a while- let alone a reverse rotation roller cam (as those blanks never existed, historically). We do know of at least one place who has sourced the roller blanks so there are a few kicking around out there in the wild, but they don’t appear to be doing business with Comp.

What’s the story? Did I get the wrong tech? (Obviously being able to “grind anything” is true- assuming they have a blank with which to start).


Posted By: KENO
Date Posted: June-08-2021 at 3:37pm

And then there's the question of the gear............(although there might be somebody out there who can say Abracadabra and whip one out of his stockpile) Wink


Posted By: Mustang347
Date Posted: June-09-2021 at 11:14pm
Trb sorry to just be replying, I got the can ground back in 17. Did you get the name of the tech you spoke too? Also melling still has a large selection of Rh cams and will sell a blank. Keno lol like the caption, also are you speaking of cam gear as it's reverse , timing chain is a std double roller gear set or Dizzy which is Og Mallory


Posted By: KENO
Date Posted: June-10-2021 at 7:22am
Originally posted by Mustang347 Mustang347 wrote:

Trb sorry to just be replying, I got the can ground back in 17. Did you get the name of the tech you spoke too? Also melling still has a large selection of Rh cams and will sell a blank. Keno lol like the caption, also are you speaking of cam gear as it's reverse , timing chain is a std double roller gear set or Dizzy which is Og Mallory

We know the gear on the cam is reverse and the gear on the distributor is reverse also, but what are they made of?

Since a roller cam typically uses a hardened cam gear and the only reverse rotation gear available for a 351w distributor is cast iron that might work for a little while before some gear destruction takes place, certain people will be wondering what your distributor gear is made of and where you got it and how much you paid for it or just what you did so it will have a long and happy life married to that cam gear. Wink


Posted By: TRBenj
Date Posted: June-10-2021 at 10:28am
I didn’t write the techs name down but it wouldn’t help us anyways since he clearly didn’t have any knowledge to add.

4yrs isn’t very long ago, i haven’t worked with Comp in 8 or 9 years but I find it highly unlikely some magical RR blanks came into existence in the interim and disappeared again without a trace. A few of us here do have the extremely rare RH roller set ups in BBC and SBF form, but they come from limited run specialty companies and cost dearly. You’ll have to excuse our surprise at the suggestion that you can just call up Comp or melling and order one as easy as a ham sandwich. Flat tappet is another story, though those blanks are getting harder and harder to find these days… and the blanks have limitations on how much lift they can build in (nothing close to the specs your claiming has been available in the 15+ years I’ve been keeping track, afaik).

KenO makes some good points on the gear also- the specialty gears required by roller cams don’t exist in the wild in reverse rotation form either.


Posted By: 67 ski nat
Date Posted: June-10-2021 at 11:08am
Originally posted by KENO KENO wrote:










And then there's the question of the gear............(although there might be somebody out there who can say Abracadabra and whip one out of his stockpile) Wink




Posted By: Gary S
Date Posted: June-10-2021 at 11:15am
Speaking of abracadabra and flying like an eagle what ever became of Steve Millers work with LSM? Thought this was the answer......
https://www.correctcraftfan.com/forum/forum_posts.asp?TID=46907&PN=1&title=1977-302-pcm-engine


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http://www.correctcraftfan.com/diaries/details.asp?ID=1711&sort=&pagenum=1&yrstart=1966&yrend=1970" rel="nofollow - 69 Mustang HM SS
95 Nautique Super Sport


Posted By: KENO
Date Posted: June-10-2021 at 11:44am
Originally posted by Gary S Gary S wrote:

Speaking of abracadabra and flying like an eagle what ever became of Steve Millers work with LSM? Thought this was the answer......
https://www.correctcraftfan.com/forum/forum_posts.asp?TID=46907&PN=1&title=1977-302-pcm-engine

That is the answer.................he paid dearly for a cam and then figured out there were no distributor gears  that were compatible and LSM wasn't any help on the gears and he had to pay somebody else more dearly and ended up getting a dozen made.

Maybe people will pay him dearly so he can "take the money and run" Wink

Like TRB said, no readily available stuff without jumping through lots of hoops.



Posted By: GottaSki
Date Posted: June-10-2021 at 12:11pm
Awesome steve millering Gary
I'm still perplexed like a space cowboy fitting a boss intake on procomp windsor heads while procomp has cleveland heads to make a proper clevor boss302


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"There is nothing, absolutely nothing, half so much worthwhile as messing around with boats...simply messing."

River Rat to Mole


Posted By: Mustang347
Date Posted: June-10-2021 at 12:49pm
Trb, just spoke with Will at comp seems after some digging around as he's only been there the last 2yrs that around 16 early 17 was the dying off point of there RR stock. So as he told me, shoulda bought 2 as a back up! Keno I'm running a brass gear, which seems to be holding pretty smooth. Gottaski, I'm running the Boss intake because it was given to me also I got really good deal on the procomp sbf heads which were able to be port matched to the intake. But starting from the beginning, I posted about prop size and joined this forum because I thought it would be somewhat polite and informative. Which there has been that thanks Mcd and few others, but not to be picked over how I built my engine or where I got parts years ago. I also have a turbo 460 in a 77 a ls swapped 78 a built 454/ t5 swap in my 74 auto cross vette and a stroker going in my wife's maverick. And drive a 700hp f250 daily that gets 28mpg on the highway. So if anyones curious about those also Pm me an I'll give you my cell#


Posted By: KENO
Date Posted: June-10-2021 at 1:19pm
Umm.........most people here exchange information and when you show up with an odd ball setup they might like to know where you got the parts.

So.......where'd the brass RR gear come from? That would be a good exchange of info.


Posted By: Mustang347
Date Posted: June-10-2021 at 1:34pm
Keno, Basic power industries out of NC. Also your comment is understandable, but the manner in which some are going about it is an obvious manner of ops no see that's not right I couldn't find info on the web so he's incorrect. I've been building motors with my dad for over 20yrs if someone has a sincere question than ask, not to respond and say they couldn't find anything on what I said there in its not true. Just as the tech at comp said this stuff is dying out especially Rr motors and if and when you can find it ya better get 2. Also this isn't a odd ball setup, it's just simple Rr and I was able to source what I need at the the time..


Posted By: TRBenj
Date Posted: June-10-2021 at 1:57pm
The information you asked for was in post #12.

Believe it or not, some people on the Internet are FOS.


Posted By: Mustang347
Date Posted: June-10-2021 at 2:04pm
Trb now that I want disagree with, hence the reasoning i joined this forum. I hate social media ie Fb, instagram etc. Also can someone walk me through how to post pics


Posted By: KENO
Date Posted: June-10-2021 at 2:17pm
Click on the link and read down to the 3rd post, it has some picture info and also some guy's e mail address who would probably post a few or so pictures if you were to e mail them to him Wink

http://www.correctcraftfan.com/forum/forum_posts.asp?TID=49878&title=72" rel="nofollow - link

If you keep going, there's mention of posting to Imgur then doing a copy and paste.

It just ain't an easy thing to do.






Posted By: GottaSki
Date Posted: June-10-2021 at 9:03pm
We really are on your side Tyrone , you must admit you have a one of a kind and odd setup and claiming 1.3hp/ci needs some examination to help you with your prop selection proper.
Your boat is small and light and you have inquired about launch vs top speed
What rpms do want to be at topped out at? Where do you predict the power peak?
I haven't seen your duration on the cam, that would help us too
Because right now you have a 351-4, high lift big valve aluminum head. And we can extrapolate from there because you are not alone with alum heads nor more cam.
Acme recommendation sounds steep to me if you are after hole shot with a big cam.
Hopefully you aren't afraid to spin it




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"There is nothing, absolutely nothing, half so much worthwhile as messing around with boats...simply messing."

River Rat to Mole


Posted By: 67 ski nat
Date Posted: June-12-2021 at 8:40am
There are some extremely knowledgeable ford RR guys on this forum. The info they can provide is amazing for such small tight group. They will hang with you and help for several pages until your fixed
Sounds like you are a bit of a master as well
You have probably gained respect with your build
Please stay with us



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