Thread: 502 ramjet

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Hey Ventura, sorry to hear about your low rpm issues. Get 'em fixed yet? One of the reasons I wanted to go with a GM set-up was to avoid those types of problems, yet as you can see BADFISH went that route and had problems anyways. Mind you it could simply be his too-cool water temps...
I 've installed the engine on the subframe of a donor truck which I purchased 2 months ago. I also cut out the cab section so as to allow me to use it for fitment purposes. 4L80E from PATC c/w Compushift controller is now sitting in the frame as well, feeding an NP241C off've a 94 3/4 ton pick-up. The subframe has had pretty well all the steering/suspension components replaced. Within another 2 weeks, my baby'll be pulling into my garage with a puny 4.3 for tha last time.

DONE!!!!!!!!!!!

Engine/frame assembly was swapped in last week, started her up on Saturday. Freakin' awesome. The exhaust is a bit louder than I'd hoped for (meaning I didn't wanna hear it at all LOL) which means I get some heads turning in town. But other than that, she runs great.
I'm surprised that she has a lopey idle, I always thought that fuel-inj. motors can't run that much cam. But she doesn't bog or load up, even if she's been idling for 5-10 minutes.
It was a heckofa swap, about 10 times more labour & fabbing intensive that I thought it'd be. I'd never do another one like it, but I'm beaming with pride that I pulled this one off.
Anyone ever wanna do something as stupid as I've done *GRIN*, I'd be more than happy to answer any questions.

peter2772000@yahoo.com


EDIT. Rats, I did it again. I thought I had shrunk the pic down enuf, guess I was wrong. Sorry...

I have built two 57's with 502s in them and have had the same problem of hunting and too rich and really lacking in power with both of them. One was a 3 and the last one is a 4 type. What I found on both of them is that the factory tightens the valves WAY too tight. I would suggest you adjust them if you haven't. You will find that you can back them up a full turn and still won't have any clearance. If you do it with the engine running get ready for a big mess of oil on everything. I actually read your post today looking for an answer to another problem that I am having with the type 4. I hope this helps. It will cure it!