TPI lower plenum
#1
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Location: Dover AFB, Delaware
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Car: 1986 Iroc-Z
Engine: 5.7
Transmission: 700r4
Axle/Gears: 3.23
TPI lower plenum
Does anyone know if the TPI base for an 86 and a 89 are the same. Mind you I know the intake bolt holes are at a different angle, but that is what I want. I located a nice set of heads but they are 87-95. I want to change the TPI base and switch everything else over.
#2
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Re: TPI lower plenum
Im not sure what you mean bye lower plenum. But the only difference in the intake in f-body between 86 and a 89 intake would be the inner 4 bolt angle but the holes can be elongated. The 89 intake does not have a provision for the ninth injector cold start timer switch.
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Car: 1986 Iroc-Z
Engine: 5.7
Transmission: 700r4
Axle/Gears: 3.23
Re: TPI lower plenum
Ah ok. I wanted to make sure there were no other differences between the bases. What I want to do is use a newer base for the tpi so I can use newer heads.
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Car: 1986 Iroc-Z
Engine: 5.7
Transmission: 700r4
Axle/Gears: 3.23
Re: TPI lower plenum
Thanks for all the info man. I am assuming that if I use a TPI base from later than 88 there is no cold start injector and I would have to make changes to the ecm.
#6
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Re: TPI lower plenum
you can drill and tap the plenum for the timer switch, or got to 89 $6E programing and buy a csi delete kit just to make sure the csi isn't leaking.
http://www.ebay.com/itm/Chevy-TPI-SBC-Cold-Start-9th-Injector-Block-Off-Delete-Kit-/380661635968?pt=Motors_Car_Truck_Parts_Accessories&hash=item58a1339b80&vxp=mtr
http://www.ebay.com/itm/Chevy-TPI-SBC-Cold-Start-9th-Injector-Block-Off-Delete-Kit-/380661635968?pt=Motors_Car_Truck_Parts_Accessories&hash=item58a1339b80&vxp=mtr
#7
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Join Date: Feb 2010
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Car: 1986 Iroc-Z
Engine: 5.7
Transmission: 700r4
Axle/Gears: 3.23
Re: TPI lower plenum
Hey thanks for the fast responses. What I ended up doing was finding a decent priced TPI base for an 88 camaro with cold start injector. Didn't want to mess with compatibility. But this information is still very useful should I ever decide to delete the injector. Thank you so much!
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