Re: New Gen Holley.
Ok, I had a bit of a play with the old 600 last night, fitted a new cam to the throttle pump (bone or cream one). the Flat spot is heaps better, I can actually drive the thing now. But it is still there.
Any suggestions on how to get rid of it. Basically it idles really nice, but any rapid change in throttle possition causes it to cough, then it will catch up and off you go.
I have the adjuster screw on the throttle pump just loose so you can just move it without the pump moving. it seams to work better like this than it did when it was tight. I tried both settings on the new cam and this one works best (top hole). I screwed the idle mixture screws out an extra 1/4 turn didnt seem to make any difference.
The only other thing I noticed is when I took it for a drive it got pretty hot. Like too lean. From memory it has 60 and 64 jets in it.
Pics are post on www.fordespghia.com