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"The 5/16" fuel line you are running is too small"
I'll say it again your fuel line is fine. You can run 11's w/ a 5/16 ine and mech pump...even w/ a 440-6 in a B-body. If it's fuel issue you either have a clogged filter or you car is lean. changing the line to 3/8 won't do squat.

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If you have 140 across the borad you have a compression problem...either your valves are a tad open or you don't have the 11:1 you thought you had.

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I'm not sure what a decent CR means,

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overkill = cheap security. If you are pushing the edges of the envelope, you will only go lean once! Could I see a show of hands of those on this thread that even have a fuel pressure guage in their car?

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for two cars

but I've seen many a car run 11s with just 5/16 lines

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overkill = cheap security. If you are pushing the edges of the envelope, you will only go lean once! Could I see a show of hands of those on this thread that even have a fuel pressure guage in their car?

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for two cars

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Dude, is that Hitler, or what???

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Theyre not flat tops. They have a .050" quench dome, and a .039" head gasket, sitting .009 in the hole...with a .050" recess machined in the chamber

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I've also supported 550hp with a factory mechanical and 5/16 line. Many lines now have kinks and guy dont cut them properly so the flow is much lower than it should be. That fact is, overkill sells, and in many cases, meaning a car that runs in the 12s or high 11s, they simply dont need that much pump or line. In somecases, you add so much volume in the line the milder pumps have trouble pumping against the inertia of the fuel in the line in first gear.

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Im working on getting a degree wheel. But heres another "long shot". Edelbrock recommends the use of adjusteble rocker arms when using cams with a greater-than-stock lift. There has to be a reason for this. Since Im running the MP509, is it possible the rocker stands themselves might not be machined at the same height as say a stock cast iron head, therefore causing the valves to "hang open"? Much like a Chevy with the rockers adjusted too tight? I do have experience with that scenario and the effect is great. I should have a degree wheel tomorrow and Ill take a crack at it.

But who here thinks I could benefit from an adjustable rocker setup? Id like to rule that out as a possibility as well. I appreciate all of the replies. Its all very interesting. I just hope I can get to the bottom of this.

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