LM7 Exhaust port
#1
Teching In
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Join Date: Jul 2010
Location: Warren, Mi
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LM7 Exhaust port
Has anyone worked the bump at the base of the valve stem boss in the roof of the LM7 exhaust port and had any problems with the water jacket area? Does smoothing the bump cause a hot spot or breakout into the water jacket? I'd like better flow without causing a hydrolock issue. The wall thickness under the bump is supposed to be about 4-1/2 mm's. I'm thinking I removed about half of that material. Any information about past experiences would be appreciated. Thanks.
#3
TECH Senior Member
Looks like the port wall thickness is consistent enough that any bump can be ground off with no ill effects to the head.