Modify 87 TPI base for 84 heads?
Thread Starter
Joined: Jul 2006
Posts: 686
Likes: 2
From: Davisburg, MI
Car: 87 Evoluzione, 84 TransAm, 05 GTO
Engine: LT1, L98, LS2
Transmission: (2) T56 & (1) 700R4
Axle/Gears: Moser 12-bolt w/3.73 & Stock
Modify 87 TPI base for 84 heads?
I've talked my daughter into converting her 84 T/A to FI. I'm supposed to pick up a TPI system from an 87 IROC this weekend. Most sites say I need a non-roller block base (85, 86 F-body or aluminum head Corvette). I've seen some hints that the center mounting holes can be modified. What about the EGR passages? Which base gasket would I use?
Joined: Apr 2005
Posts: 7,736
Likes: 14
From: Not in Kansas anymore
Car: 82 Z28
Engine: 383 SP EFI/ 4150 TB
Transmission: T400
Axle/Gears: QP 9" 3.73
Re: Modify 87 TPI base for 84 heads?
You just slot the the two center holes in the F-Body intake to suit the different bolt angle used on the regular SBC heads.Might need a washer under bolt head
Intake gasket is the same; only the angle of the center bolts differs .
72 degrees vs 90 degrees on pre '86 iron and Vette alum heads
Intake gasket is the same; only the angle of the center bolts differs .
72 degrees vs 90 degrees on pre '86 iron and Vette alum heads
Thread Starter
Joined: Jul 2006
Posts: 686
Likes: 2
From: Davisburg, MI
Car: 87 Evoluzione, 84 TransAm, 05 GTO
Engine: LT1, L98, LS2
Transmission: (2) T56 & (1) 700R4
Axle/Gears: Moser 12-bolt w/3.73 & Stock
Re: Modify 87 TPI base for 84 heads?
Thanks, I should have checked Rock Auto to see same gasket used.
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