1976 PCM 351

I have looked around this forum for some simple answers to my specific need, and cannot find the needle in the haystack. So, here it goes. I would like to eventually rebuild my 76 351. Wouldn't mind a few extra horses. Is porting the heads an option? Are GT40 heads the way to go? And, are there any rebuild "kits" available anywhere?

I understand that this is a major undertaking, with a reinstallation requiring lining up the block precisely and getting the flanges to the prop shaft to line up. I am mechanically inclined, but would need help understanding all of the "top dead center" stuff, what I should do, and what I shouldn't do. But at this point in time, I wouldn't mind chatting with someone that has gone through this before, and can give me a little insight/foresight.

Thanks again for taking the time to respond, I really appreciate it.
ps. the engine probably has a good 4000 hours on it. It really doesn't burn oil, or leak anywhere, and actually purrs at 3600 RPM.

Welcome to CCF!

Why are you thinking re-build, especially if it is running well. How many hours are on it? Are you not happy with performance - which could be just tuning, timing, or prop sizing?

You will quickly find out we all REALLY like pictures here, so put some up!

Tony, there is a lot of discussion about this on the site. If you find the search here won't get you where you want, try using Google and "correctcraftfan.com" along with the subject and sometimes that works better.

The intake, heads, and cam as Gary suggested is the simple way to add 50-60 HP to a 351. Not all that expensive, either. Engine removal and re-install are not hard at all, and shaft alignment takes some care but again isn't difficult.

Take a look in the Common Questions section, there's a thread about GT-40 and GT-40p heads at the top.

TRBenj wrote: Someone should dig up the link to Alan's 351w rebuild thread... Should have all his answers and then some.

351 rebuild

And I do appreciate everyone's advise. I am on the fence as to whether or not rebuild the 351 as it is running nicely, even after 4000 hours. I understand that it had a valve job about 20 years ago, but that's about it. And really . . . is it really worth spending bookoo bucks to do an upgrade to gain 30-40hp? Different prop to match (another $600). The implications and considerations? Why would I really need a better hole-shot, when she performs just fine. I can easily get a 300# person up on slalom without problem. I am starting to lean towards a simple rebuild, if anything at all, unless there is overwhelming evidence otherwise. Hmmmmmmmmmmm.

I was not trying to pawn off the responsibility of a decision to the group. What I am hoping for is all of your experiences and wisdom, so that I can then make an intelligible choice.

If it can easily get a 300 pounder up on one then clearly you don't need the few extra horses you speak of. Plus you say it runs fine. If it ain't broke don't fix it.

74Wind wrote: If it can easily get a 300 pounder up on one then clearly you don't need the few extra horses you speak of. Plus you say it runs fine. If it ain't broke don't fix it.

How do you know he doesn't have a few 340 pound friends?

63 Skier wrote: 74Wind wrote: If it can easily get a 300 pounder up on one then clearly you don't need the few extra horses you speak of. Plus you say it runs fine. If it ain't broke don't fix it. How do you know he doesn't have a few 340 pound friends?

Well, if he indeed does then I would refrain from comment. Or suggest they contact the Falcons , they could use the help.

Looks to be an orginal 13x13 Federal Prop.

As for an upgrade in prop, I would definitely listen to them, they know their props . I would not believe it until I went to the cc reunions.

I just upgraded to the 540, bought from delta for $360 with discount, but unfortunately will not be able to test it till next year

Good luck

You can't id size definitively from the picture but it's obviously a federal or MW. Even if it's the optimal size (13x13) it's performance is worlds behind that of an Acme.

A lesk down test would be in order. If all cylinders are holding pressure well & oil pressure is OK, then just run it as is.

It tests the ability for a cylinder to hold pressure, which indicates the health of the rings and that the valves are seating correctly. You pressurize the cylinder with compressed air with valves closed at TDC and see how quickly it leaks down, and whether it leaks by the rings or out a valve.

Chris, think it's necessary? If plenty of power, no oil consumption, and good oil pressure I wonder if he should just keep running it until a there's some indication of a problem. I suppose it would answer the question on overall engine health.

The 540 is the right prop. Too much info has been shared previously to recount here... Try a search.

Delta propellor has great prices and we get another 5% off on top of that. Click the "links" at the top of the page for the code. When selling direct, acme sells at full retail to protect their dealer network.

Ever year changed with 20/50, along w/tranny oil, filter/water separator filter. Lifted the carb each winter, and so and so forth. VR1