Re: intake gaskets for performer manifold?
Using the RTV on the ends of any SBC manifold up to the Vortecs is recommended and how GM did it. Even the Fel-Pro gaskets say not to use the gaskets they include and usually include silicone.
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68' C20. 283CI w/55CC 305HO heads, NP435 Close Ratio, Corp. 14 bolt FF 3.21, 75' front end swap (everything but the X-member).
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