vortec bolt pattern same as 87 and up?
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Junior Member
Joined: Feb 2013
Posts: 37
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Car: 1987 iroc z
Engine: 305 tpi for now
Transmission: 700r4
Axle/Gears: 3:24
vortec bolt pattern same as 87 and up?
cant seem to find a straight answer. im working on another 87 iroc 305 700r4.
im doing a tpi to carb swap and someone told me you have to use vortec intakes for 87 heads because of the bolt pattern. im going to put on a set of vortec heads in the near future any way so i dont mid buying 1..............
im doing a tpi to carb swap and someone told me you have to use vortec intakes for 87 heads because of the bolt pattern. im going to put on a set of vortec heads in the near future any way so i dont mid buying 1..............
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: vortec bolt pattern same as 87 and up?
Only have to look and compare the two intakes ; Not even close
Vortec head has only 4 bolts a side , reg SBC heads off all years have 6 bolts
]
And the intake ports are a completely different shape so even if the intake did bolt up , it wouldn't work
]
Vortec head has only 4 bolts a side , reg SBC heads off all years have 6 bolts
]
And the intake ports are a completely different shape so even if the intake did bolt up , it wouldn't work
]
Last edited by vetteoz; Jul 1, 2013 at 03:57 AM.
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: vortec bolt pattern same as 87 and up?
If using any non Vortec SBC head you can make the other style intake work by just filing the intake bolt holes out to suit the different angle.
Exactly the same as the aftermarket intakes where one intake fits both style heads ; early and late .
Last edited by vetteoz; Jul 1, 2013 at 04:00 AM.
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