I thought it'd go faster....

MomsR/T said
I agree with this diagn.

If the thing was nosing over at the top end, thats a classic case of valve float...............you never mentioned spring pressure or how old they are/were.

The springs were new when I put these heads on 3 years ago and I've only put 20 or so runs on it since then.

I also agree that it may be a tuning issue but I don't feel that changing the cam all of a sudden makes the plugs any better or worse than they were before..............

Is this a vacumm secondary or mechanical? You may have a slight vacumm loss (based on overlap) and thus not bringing in your power valve or secondaries early enough............

It's a 750HP, mechanical secondary carb. The jetting is square (73 all around) and a 6.5 PV.

The problem with the plugs is that they're old... I didn't change them this season (oops) and when I was checking out the wires this afternoon I found one that's cracked. I've got a new set of wires and will pick up some plugs for it this week... I've also got an MSD distributor that's been sitting on the shelf for a while, maybe now's a good time to put it in.