Taking It To The Track

7e5hangten360 said

congrats for your 11 seconds time slips on the first time out. 5 in. of vacuum idling in park aint much, your power valve is probably open all the time. also, from your et, you should be going 115 mph or so , as you already know. i suspect that this 3310 is where you could improve. if you could borrow a double-pumper that is in good shape... look at the vacuum reading with the double pumper, it should go up. if vacuum doesnt improve, try twisting the distributor. that 508 cam will like a lot of initial advance. none of this costs money. have fun! and be ready for personnal bests!

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Thanks for the kind words.
I took out a 6.5 and installed the 2.5 I mentioned while tuning it on the street, before I went to the track. That and a few other things has it idling in gear now. Next, I'll install PV rated a bit higher than any vacuum reading I get through the traps. I have to hope that PV won't open at idle, in gear. That's why I have to see what vacuum it has in gear, idling. After that, from what I read in Dave Emanual's, "Super Tuning and Modifying Holley Carbs", I'll have to try a combination of blocking the PV, richening the jets, and making the idle feed restrictions smaller.
That's what I see. If anyone has other ideas, I'm here to listen!

I don't know anyone to borrow a carb from, but I think I have to make mine work. But I suppose it could have a vacuum leak in it. I haven't found any leaks anywhere.
What would make a double pumper have a higher vacuum reading than a vacuum secondary?

My distributor is set at 35* total, with a lot, probably 25-28* initial (all in quick), also aimed at getting it to idle. I also have an ignition kill switch so that it'll spin when starting hot.