Heads, Casting number 624
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Joined: Jan 2002
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From: webster, ny
Heads, Casting number 624
hi, i am looking into some heads and was wondering exactly what they are. i was told they are 76 cc and were vette heads. the casting number is 624. can anyone veryify what these are? thanks a lot!
Joined: Mar 2000
Posts: 5,703
Likes: 132
From: Orange, CA
Car: '90 Trans Am-12.45@110.71
Engine: 355 w/AFR 195's Elem. 400/430 HP/TQ
Transmission: Tremec T-56
Axle/Gears: 12 Bolt 3.73
Heads
They are not 'vette heads. They are 76 cc 1.94-1.50 perimeter bolt pattern on the valve covers and are for early style intakes(up to '86). They would lower the compression too much unless you change pistons.
Thread Starter
Member
Joined: Jan 2002
Posts: 476
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From: webster, ny
yeah i will be changing pistons. i am building a 355 tpi motor from scratch and havent purchased anything yet. i am getting all my parts straight before i do anything yet. i have one more question for you. what compression ratio should i be running with a set of domed pistons? tahnks a lot
Joined: Mar 2000
Posts: 5,703
Likes: 132
From: Orange, CA
Car: '90 Trans Am-12.45@110.71
Engine: 355 w/AFR 195's Elem. 400/430 HP/TQ
Transmission: Tremec T-56
Axle/Gears: 12 Bolt 3.73
Heads
No more than 9.8 with steel heads, alum. maybe 10.1
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