Can somone give me info on the factory heads in a 1987 GTA 5.7?
Thread Starter
Supreme Member
Joined: Jan 2000
Posts: 1,180
Likes: 82
From: Mississauga, Ontario Canada
Car: 1987 GTA
Engine: 5.7
Transmission: T5WC
Axle/Gears: 3:27
Can somone give me info on the factory heads in a 1987 GTA 5.7?
Just wondering what the factory specs were on cylinder heads. Such as CC's and stuff. And since I have 1.64 or somthing exhaust valves and .202 Intake valves. Would this change things. Thanks just curious
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1987 T/A GTA 5.7L, Bored .020 and ported for .202 valves, edelbrock headers, flowmaster exhaust, JET STAGE II chip, Comp CAM, Adjustable fuel pressure, Airfoil, K&N filter, B&M stage 2 shift kit, and a home depot ram air(Hey it looks good and it works)
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1987 T/A GTA 5.7L, Bored .020 and ported for .202 valves, edelbrock headers, flowmaster exhaust, JET STAGE II chip, Comp CAM, Adjustable fuel pressure, Airfoil, K&N filter, B&M stage 2 shift kit, and a home depot ram air(Hey it looks good and it works)
Supreme Member
Joined: Jul 1999
Posts: 5,183
Likes: 42
From: Oakdale, Ca
Car: 89 IrocZ
Engine: L98-ish
Transmission: 700R4
Change you sig line, my friend.
You have 1.94 inch intake valves, and 1.5inch exhaust valves. Lot's of discussion has occured about the combustion chamber size, most settle for 64cc's.
You have 1.94 inch intake valves, and 1.5inch exhaust valves. Lot's of discussion has occured about the combustion chamber size, most settle for 64cc's.
Joined: Jul 1999
Posts: 10,950
Likes: 26
From: Orange, SoCal
Car: 1990 Pontiac Trans Am
Engine: 355 TPI siamesed runners
Transmission: Tremec T56
Axle/Gears: 12-Bolt 3.73
I think you mean 2.02" and 1.60" on your intake and exhaust valves. Stock are 1.94" and 1.50" like 8Mike9 said. Stock combustion chamber volume is 64cc's or so.
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1991 Camaro Z28
5.7L 5-Speed (originally 305)
13.23 @ 107.62 MPH
Southern California
Member: SoCal 3rd Gen F-Bodies
Webmaster: SoCal F-Bodies
-=ICON Motorsports=-
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1991 Camaro Z28
5.7L 5-Speed (originally 305)
13.23 @ 107.62 MPH
Southern California
Member: SoCal 3rd Gen F-Bodies
Webmaster: SoCal F-Bodies
-=ICON Motorsports=-
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