i am swaping my 88 firebird formula 305 tbi with a 88 chevy truck 350 tbi and i was wondering if any one could tell me what cc the heads are on both of these motors please and thank you

 

Moved this to its own thread, and out of the Engine Swap forum, because it didn't belong where you posted it.

Approximately 58cc and 64cc, respectively. Actual results may vary.

 

i thought the L05 heads were 68cc.

 

New, stock, the LO5 heads are about 65 cc, while your '88 LO3 is closer to 55 cc.

 

well that would explain my pre ignition problem with my s10.

 

Have you tried any de-carbonizing? Seafoam, or ATF? Also try filing the sharp edges off your spark plugs.

 

i haven't tried that. its done it since i built the engine 2 years ago. i figured the compression with 68cc heads to be 9.0:1. i runs well on 89 or higher octane. i'm using rapidfire plugs.

 

thanks guys and sorry about posting in the wrong spot im still new to this site and just figured out how to do my own posting a couple days ago

so just wondering would you go with the heads on the 350 or swap my ones off the 305 to the 350 im working with a tight budget and im not really looking to make a 4 or 5 hundred hp car but would still like a little more power then just a stock motor
thaks for any help you could offer me.

 

i would use the 350 heads. compression would be to high with the 305 heads.

 

thanks thats what i was thinking but im no mecanic im more what you would call a parts replacer lol but im learning one step at a time.

 

So you're at 9.3:1. That's not gonna cause preignition by itself. Not even with a stock LO3 cam.

 

Plus your TBI 305 heads never belong on any 350.