Is it 58cc or 64cc? I thought 58, but aserting that it has 64cc heads, which is it? His car is a 89 RS convertable, would have had the L03 right? I know his car was a v8 stock because he swapped to HO heads.
https://www.thirdgen.org/messgboard/...ML/004979.html

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1989 Pontiac Firebird Formula LO3 Auto
-180 degree stat
-Hooker Cat-Back
*****Possible summer '01 mods*****
Open Element, Auburn Posi, Keyless Entry, wonder Bar off the IROC, 4th gen seats, T/A tail lights

1985 Camaro IROC-Z LB9 Auto
http://www.geocities.com/krt80/

The LO3 heads are 58cc. 64cc heads on a 305 would send your compression ratio down the toilet (without domed pistons).

-Mark W.
'88 SC Camaro w/ 305 TBI

Ok, thanks just making sure.

hotrod magazine once CC'ed them at 55.3 cc's

close enough