Fastest Chrysler?

SO i see all the talk, OF who has the fastest boat. Most of what i see is alot of small ford motors. I know much more about them, since im a big Mustang guy.

Dont know too much about these chrysler motors. Who has been working on these trying to get a few more ponys. I would of loved to get a 351, But i could not pass up the deal i got on my new ride!!!

Thinking about getting some head work done, Mabey new springs, a fresh mill and a Valve job. I was looking for some after market heads. How Ever the market on them seem kinda small. Also looking a Cam. It allready has a edelbrock carb. just seeing who has tried what with these 318s

its a 71 Martinique

Eric, you and I need to talk, as I'm a big Mustang/Ford guy as well, but running a close second is Mopar. I outgrew bowties as a kid. As BKH noted, arguably the fastest current boat on this site is Marshall Morgan's 340 '70 light blue Mustang, which runs 56-57+ mph all day long. His old diary listing still shows the nice 273 Mopar it came with. His 340 has a vintage Edelbrock intake (do a search on the important marine mod'n aspects of this swap before installing), flat top KB pistons, an upgraded marine cam (getting harder and harder to find) which has the same lift specs as the orig hot 340 found in the auto appl'n, and a very warmed over set of iron 2.02/1.60 heads. Aftermarket heads are available from Edelbrock but those are pricey, so I'd recommend spending a few bucks on the ones you have with good results or find "X" or "J" Mopar cast irons castings. It may be best to rework your existing going with larger valves, as the 340-360 larger chamber X and J heads will lower your compression somewhat (unless you change pistons) offsetting flow gains. If you decide to do a total rebuild strongly consider getting a bare 340 block for $200-500 as you can use the rods and crank from your 318 as the stroke was/is the same. Don't look at the 360 as it's slightly different requiring a new $$oil pan, etc. The biggest downfall IMO are the old log exhausts, which sound as good or better than any engine out there, but can't possibly flow as good as a later model center-rise or more header-type exhaust. The later model Chrysler center rise pieces are out there and available. I think it's Brian, (someone correct me if I'm wrong since he doesn't come on the site much if any) that has the 71-72 SN with the 318 and Holley Pro-jection which has been at Green Lake the last 2 years and flys to tune of 52 mph. I rode in it, and it's strong. (I started and stopped 1/2 dozen times and over 2 hrs and a handful of beers on this post so please forgive mistakes)    

EDIT: I just realize Phats beat me to half the punch after I'd finished and I wasn't responding to any of his comments. He knows his Mopar sh%t.

The only parts of this thread I understand is: the 318 sounds good. Mine takes me fast enough to ski, and I love the sound while I'm being towed behind it.

Someday I'll find a downhill lake and see if I can go faster.

Chuck

Im a chevy guy to the end, but you cant beat the sound of a mopar

Niagra river is about12 mph, when you see spray though you start to get worried

Forgive me for not being a huge Mopar man, But what model cars would i find the x/j/swirl port heads on. Seeing how im a ford guy, I know that cobra mustangs 93-95 came with GT40 heads and 5.0L exploders came with the GT40P head. not to mention you can round up used trickflow heads for well under 1000 bucks.

Like i said im still learning about these mopar motors.

What keywords should i use to find the marnie mods for a intake?

I was reading that all off the mopar heads lack in the exhaust port, and headers makes a huge diffrence, i know thats not a huge option, unless i spen big bucks. I guessing you should favor the Exhaust duration in cam specs...

Thanks for all the help so far!!!

whered you get the 5-10 info from, we are running timing similar to cars, its just not vacuum advanced.

Any one run a Elecric Water pump?

Eric H wrote: Any one run a Elecric Water pump?

You are not going to see any gains in HP with running a electric pump. In fact the opposite! You would need to keep charging the battery while running the pump. The generation of electric power isn't 100% efficient and why alternators heat up. It's lost energy being converted to heat.

Just curious on the Water pump deal, I know thats What we run on the track and street ford motors. I just know the 2nd water pump(forgive me for not knowing the proper name) Takes a good bit of force to turn.

CSR among others make a small block water pump

On a dyno we have seen as much as 15 RWHP with the electric units

Reid, i think a little oil runs in your veins

Yes boat doc. It has never been dynoed but considering the weight of the car and the 1/4 et and mph it should be making 385 to 400 at the crank. I didnt mention it has some headman 1 5/8 headers and 9.8 to 1 ish compression. 360's run like raped apes with minimal speed mods. The car weighs around 3900 lbs with me in it and runs 13.19 at 104mph on 235 drag radials 2600 stall with a stock transmision 3.91 sure grip rear end. Best 60 foot is 1.88 and does that all day long on pump gas at 32degrees full advance. I think theres some more power in the timing becasue most small blocks like 36 degrees for most power but I didnt have time to bump it up anymore.

Like the other guys said the 340 swap would be much easier than the 360 because a 360 is externally balanced which is stupid because it needs a balanced flywheel or converter so I just had mine balanced internally with heavy mettel in the crank and now I can do whatever I want on the outside of it. Dont use the 318 rods or crank. The earlier 340 cranks were forged and 340s had much stronger rods.

Still have a serios doubt that you are making that kinda HP with that motor.
Just for giggles if your numbers are accurate, the mods to my stroker should net me at least 400+. And it just aint gonna happen in the real world.
If you can acheive one HP per cube you gotta lot of money invested.It is not gonna happen with a set of headers and a mild cam on a smog motor w/ higher than normal comp.
There is a lot more to the equation , but then if your spinning that MOPAR 7500 it may be making those #'s.
Several mods to mine and I HONESTLY think she is in the 330 range and that may be a little HIGH..........Again JMHO...Boat dr

Do a search on the HI-Teks, they are true headers, and the water don't dump till after the collectors.My numbers are still low compared to yours.....


1964 American Skier, click on this under my name and you will see pics of my motor and the SS HI=TEKS.