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Old 02-13-2012, 01:03 PM   #1
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Car: 1989 formula
Engine: stock lo3 305
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383 with vortec heads question

can i just put vortec heads on a 383 or do i have to machine anything
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Old 02-13-2012, 02:50 PM   #2
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Car: '86 Bird, 96 ImpalaSS, 98 C1500XCab
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Re: 383 with vortec heads question

The Vortec heads will bolt right onto any Gen 1 SBC (the steam holes for a 400 block would be the only consideration).
The head-to-intake bolt pattern is what's unique for Vortec heads.
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Old 02-13-2012, 03:01 PM   #3
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Re: 383 with vortec heads question

Quote:
Originally Posted by AJHECK95 View Post
can i just put vortec heads on a 383 or do i have to machine anything
They will bolt on to your block, but you will still have the same valve-lift limit (around 0.460") of the Vortec head unless that is corrected, and due to the relatively small CSA of the Vortec intake port you may be a little RPM limited (power wise) on a 383. It's not bad for street driving, but for best track results some careful porting would be in order.
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Old 02-13-2012, 03:01 PM
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