fuel boiling

[Clone TIE Pilot]

For some engines they sell lifter valley splash shields to keep hot oil off of the bottom of the intake.

I would more likely think that the valley pan gaskets are more designed for ease of installation than for thermal reasons. After all, most GM intakes have an exhaust crossover. Just my two cents..

Probably, but I didn't mean the BOP intake gaskets, catalogs like Jegs sell sheetmetal oil shields that fit into the lifter valley of SBCs but are not part of the intake gaskets. Even factory SBC intakes have a oil shield rivited to the bottom of the intake to protect the heat crosssover. I guess if you ran vortec heads with the GM Qjet vortec intake manifold, you would avoid some of this with the lack of a heat crossover.

 

[jacobdavis1979]

Doesn't anybody find it odd that fuel would be boiling in the carb with the engine temps at only 165?

Not at all my malibu pulled the same crap a few years ago and it never runs any hotter than 170 even when its 100 degrees outside.
Theres 2 problems that cause this mostly and thats ethanol gas nowadays and the aluminum body of an edelbrock carb with those to combined its a vapor lock disaster. Thats why my fuel line is all rubber now no metal line routed along the wheel well as far from the block as possible and why i got my 1 inch phenolic spacer under the carb. Todays gas boils like crazy and edelbrock carbs are huge heat conductors.

What about the stock Qjets, would they be as prone to boiling? I think they are pot metal instead of aluminum and the mounting gaskets are usually pretty thick.

For some engines they sell lifter valley splash shields to keep hot oil off of the bottom of the intake.

My qjet never did that. The problem actully didnt start untill i put on the edelbrock. Qjet is a much better carb if you have a good one.