I am building a 350 for my firebird...I got this engine complete in a trade. I pulled the heads off to clean them up and to look at the cylinder walls and top of the pistons. Everything looks good. I wanted to see what the heads were and to my suprise the casting numbers dont match. The valves are the same 1.94/1.5, but i dont know what the chamber size is...The casting on one is-3973487 and-333882 on the other. Does it matter that the castings are different? Does anyone know where to find out the diffeces in these heads? I found some info on www.nastyz28.com but not the chamber sizes. plus I don't know if they have ever been milled...Any help will be great...
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Greg W. in West Michigan
1992 Formula WS6-A/R Rims, Stock L05 swap, Former Abuse Victim
1983 Z28-Parts car- *Sold*
1984 Z28-305 HO Auto *Sold*
1986 Camaro-V-6 5Spd *Sold*
1984 Camaro-V-6 Auto *Sold*
<Motor out -
one is supposed to have bigger intake valves. That cant be good for your engine, or power output
Eric W.
89 Firebird Formula WS6
Accel/Lingenfelter Super Ram
6.2L/382.97 ci
Custom PROM Dyno tuned
WCT-5 speed
BW 9-bolt Posi 3.45
Boss MS 18" Rims
Headman Headers 1 5/8 Ceramic Coated
Custom Dual exhaust
1LE upgrade
Custom Temperature / Navigation Rear View Mirror
In a constant state of upgrade!
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Greg W. in West Michigan
1992 Formula WS6-A/R Rims, Stock L05 swap, Former Abuse Victim
1983 Z28-Parts car- *Sold*
1984 Z28-305 HO Auto *Sold*
1986 Camaro-V-6 5Spd *Sold*
1984 Camaro-V-6 Auto *Sold*
<Motor outComment
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In some ways no. As long the chamber size, valve size, seat composition and casting weights are the same you are fine. I wouldn't mix early and later castings as the latter are lightweight emissions castings that aren't the best choice for high performance work. The 1975-1980 Light Castings, Double heat riser heads are PRONE TO CRACKING.Originally posted by carguy100200
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Thanks though
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