305/ 350 TPI base?
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Joined: Feb 2001
Posts: 396
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From: kentucky
Car: 1990 GTA
Engine: L98
Transmission: manual/t56
I'm pretty sure that they are exactly the same. The only difference is the 87 and up had their center bolt hole drilled straight down instead of the angle that older manifolds use. my 350 heads are mid 70's vintage so I used a 86 305 base and it bolted up perfectly
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