pulled the front clip off the Z/28

[DavidS]

Originally Posted by My84Z

My car runs 11 to 1 on pump :shrug:

Yep. It looks like some guys run 11:1 on pump with no problems at all.

[My84Z]

Yeah as long asyou have 93 should be no problem at all

[ILuvPizzaTimes10]

Wrong and Wrong. Sorry guys but an aluminum head transfers heat to water Alot better then a Cast iron head does. So on an aluminum head you wont have hot spots like you will on a cats iron head. like the edges of the squish area and valve shrouds and plug boss. all of those will glow on a cast iron head and with too high of compression will burn the fuel before the plug fires(detonation) and wen that happens kiss a piston good buy.

Lead additive/leaded(aviation fuel) was the reason you could run high comp on pump gas in the 60's. doing it now is not a good idea unless you run vp110(110 octane race fuel) or greater. other wise you will have to back off your timing so far that you could lose almost 100hp just so it wont ping wen its warmed up. run either lower comp pistons with the cast heads or aluminum heads if you want to be able to just drive the car without issue and special fuels. sorry to be long winded but id Really hate for you to do this and then be upset with the performance or need for 7.50 a gallon fuels.

[DavidS]

Thanks for the explanation Pizza!!!! I'd rather have too much info rather than too little.

[ILuvPizzaTimes10]

any time. theres alot to converting a classic high comp motor over for pump gas use. cast heads are the problem.

[My84Z]

Thanks capt obvious but us aluminum guys go 11.5+ with 93 11 should have no problem on a honda if u wanted lol

[ILuvPizzaTimes10]

9.5 on 93 is the limit for cast iron head John!

[My84Z]

No way maybe if you put it together

[ILuvPizzaTimes10]

look it up. then talk to me with facts not what you think will work. ass.

[My84Z]

Where did u get your facts? I have seen plenty of the stock motor cars running on 93.
With the stock small cam and low timing it will have no problem imho.