...say I feel like while I've decided to replace my vavle springs, I might as well do a head/valve job on a seperate set of 305 heads instead of the ones I have on the car now, so I can still drive it daily....so I decide to look around for a set of 305 heads for the 86 TPI motor.....my question is.....which year vehicles would work on my 86 motor? If i was to theoretically go ahead and theoretically get these theoretical heads, I'd of course theoretically go ahead and have them magnafluxed, ported and polished with high performance parts. I just need to know what year 305 TPI motors or other motors I could theoretically use them(without any problems ecm or otherwise). Thanks.

 

TTT

 

I am pretty sure almost any pre 87(non centerbolt valve cover) 305 heads would work...theoretically :lala:

 

Theoretically, the only TPI motors that theoretically used those heads is 85 and 86. I heard some theories that L69 engines (and maybe even some LG4's) may have escaped the factory with them as well.

Theoretically the best idea would be to look up the casting number and get the same kind. IIRC 416 are the last 3 digits.

 

I theoretically thank you guys for responding to this theoretical topic and giving me the theoretical information that i would need to theoretically accomplish what is theoretically in my head. Thanks again

 

Oh...and theoretically, once I have the new set of heads on, along with a set of Hooker 2055's.....i theoretically should not throw any engine codes, so as long as I let the car "learn" the new, theoretical mods, correct? Because all I'm theoretically doing is providing more theoretical air/exahust flow....is that theoretically correct as well?

 

TTT

 

No codes...

I've noticed in some of your posts you seem to be a bit over concerned about affecting ECM control of the engine...you'd be suprised about how much you can actually do without affecting anything.

Worst comes to worst, you drop 200bucks on PROM tuning equipment, and tune it better than it was before.

 

You're right about me posting alot about codes.....in the last few months, I could swear I've had poltergeist living in all my sensors and the ECM itself. Took the best mechanic in this area and the person who taught him everything he knows to get to the root of it all....I just dont want a relapse But following successful completion of the headwork and headers and then siamsed runners, I will probably get into prom burning myself and pick up the software and equipment....i'd really like to learn that and toy with it. Thanks for the response.

 

Yeah, I see your concern...but heck, after chasing all that down, you should be good-to-go incase anything pops up

But I feel your pain...before the Internet Age, I was wanting to put in a manual control swith for my fan...wasn't comfortable with the on-off limits...so i checked with a GM mechanic (back about mid to late '89) and he scared me off from it, saying "Oh, you'll mess with the computer...blah, blah,blah..".

Heck, now that's one of the most common cooling mods.

 

Yea i know....you're right heh heh....funny you should mention the GM Mechanic saying that about the cooling fan that it would mess with the computer. Incidentally, my mechanic told me the same thing. Granted, my computer cant find the signal to turn it on, b/c i wired it from the harness to a toggle switch on my dash....however, as we all know, yes...these motors were designed to run so d**m hot....BUT....you see a performance gain, longer engine life, engine oil/trans oil life out of it(at least I have). Back when i was a new user to this board, I believe i read somewhere that the reason they made the engines run so hot was for emissions for some reason....w/e....I've got the 170 thermo from the tech article on this board, and i control my fan....car never ran rich or lean b/c of it....it runs just fine:thumbup: I have confidence that with my friend's knowledge and all the diagnostics and other various tools that we will be ok with this install. There is just that bit of worry/doubt that it'll be good for 10min to 5 weeks and then something else goes....

 

Just make sure you hook up all the ground wires to the heads or you'll be chasing all sorts of random codes.

I've had some pretty off the wall setups run just fine (read: no codes) with the stock programming. Usually when you get a code, something is amiss.

 

I had a long block 4-bolt main 388 stroker built for my 88' IROC, with GMPP FB Vortec Heads & SDPC Vortec TPI, did the top end myself, including 30lb injectors, SLP 1-3/4" headers, Crane FireBall HI-6s Ignition Holley 255lph fuel pump & AFPR, and all the mods I could think of. I used an 89 Covette ARAP Hot bin, and only changed the base timing, injector flow-rate, and coolant temps for the 170 thermostat and didn't throw a single code on startup.

 

I'm plan on going over everything with 10 fine-tooth combs....after all the trouble i've had in the last few months, i plan on being extremely careful.

That makes me feel a bit more at ease.:thumbup:

 

not to be too picky but your sig is 15 lines long, you have posted it 6 times in this thread, thats 90 lines of just your sig.

We get it

I only post my sig once per thread, and if i post again, I edit out my first sig and keep it on my latest post.

 

I apologize for my sig offending you.