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Mr P I found the link you were talking about I think but its for 4500 dominator style boosters which are easy to change. I couldnt find anything on the 4150 carbs like he has. With the 4150's from my experience you need a special tool to swedge the boosters in place. if you have something for the 4150 please post it.

As far as the idle I would look at timing and possible throttle plate sticking open. I found a strange thing when I replaced the 4 hole gasket on my car. Used a Summit brand gasket and the gasket was actually hanging up the secondary throttle blades.

I would look for a vacuum leak around the intake as well. I have had that issue before.

As far as running better than gas you bet it will. You should be .1 or more faster than on gas. I picked up .3 and 4 MPH over 110 race gas on a 10.5 - 1 440.

I would change the air bleeds and set them up somewhere around 26-28 on the High Speed Bleed and 62 on the Idle Air bleed.

I changed the boosters in mine as I feared it would lean out too much on the top end with the smaller boosters.

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I know you drilled your own jets but what jets would your .129 hole be equal to - 90-something?
[/quote .129 hole size is close to holley #100 jets. Don

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Anyway no more tuning for now because tomorrow is the big race. Hopefully I can go some rounds when it matters!

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Amen. Now sharpen up that shoe polish bottle, and go mow em' down.

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I picked up the air bleeds today same as Jim was using so we'll see if they help.

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The idle problem has cleared up. Changing the air bleeds as suggested made a huge difference. The car drives around with better manners and pulls much better on the big end.

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