Bigger bore head gaskets okay?
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Junior Member
Joined: Oct 2005
Posts: 33
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From: Winchester, KY
Car: 86 Iroc
Engine: LG4 305 Powerhouse
Transmission: Auto
Bigger bore head gaskets okay?
On my stock block 305, the bore is 3.736. I can get gaskets with that bore (Summit# FEL-505SD) but Trick flow recommends Felpro# 1010 which is up to 4.155 bore. Is it okay to use the 4.155 bore gaskets with the 3.736 bore? The heads are aluminum 305 heads. Thanks.
Senior Member
Joined: May 2002
Posts: 845
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From: Northern California, Redding
Car: Red 1987 IROC Convertible
Engine: 305 LB9 TPI
Transmission: T5 5-Speed
Axle/Gears: 9-Bolt 3.45
World Products does the same thing on their 305 sr torquers. I think it's to allow clearance for the bigger 1.94 intake valves.
I went with what the manufacturer recommends, which is a gasket made for a 350 cu engine, the felpro #1003.
I think that there will be some compression loss due to the bigger bore gasket, but maybe they made up for that in the chamber design to begin with...
I went with what the manufacturer recommends, which is a gasket made for a 350 cu engine, the felpro #1003.
I think that there will be some compression loss due to the bigger bore gasket, but maybe they made up for that in the chamber design to begin with...
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