Best Intake gaskets

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Skip Fix

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So I have two different FelPro gaskets . A thick composition Felpro 1255 and a rubber/steel composite.
Leaning toward the rubber one but was wondering do they need RTV around the water passages to seal them or just at either end?
 

Schurkey

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1. What engine? What intake manifold? (Vortec 5.7L, I presume.)

2. RTV on the China Walls, not on the gaskets.

3. Assuming Vortec, I've got a preference for the re-usable silicone-rubber jobs. The early versions were problematic, but they've been improved since the Vortec small-block was new.
 

tayto

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been a while since i've mess around with a vortec intake, but I recall using the felpro 1255s, ARP bolts and torqued to 30 ft-lbs. any recommendations on torque? the stock spec seemed too low when going away from the space age gaskets.
 

L31MaxExpress

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been a while since i've mess around with a vortec intake, but I recall using the felpro 1255s, ARP bolts and torqued to 30 ft-lbs. any recommendations on torque? the stock spec seemed too low when going away from the space age gaskets.
IIRC mibe are at 13 or 15, what Edelbrock recomeends for their intake.
 

98chevy2500SS

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For the Vortec's, I use the Fel-Pro MIK98000T gasket set.
 

L31MaxExpress

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Factory intake(new China casting) on Blueprint Engines 383 with their aluminum heads.
1255s on mine. I hope you did some port work. The factory manifold much less a dorman chinese clone is terrible.

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