Posting up the same old question

[leathernotch]

High Idle

After head install, of iron gt 40's. Car idles at 800 cold once she warms up the car doesn't go below 1400, revving causes the idle to stick and it takes awhile to come back down. Vacuum when the car is cold (800to1000) is about 10 or below. Went through top-end and replaced all gaskets. No change. Why would the car idle correctly when cold?

The car idled at 1400 before we went through and replaced all of the intake gaskets and adjusted valves when we finished she idled the same no change same rpm at 1400 when she is warm. So it has to be another issue

 

[leathernotch]

Going to move post to checklist

 

[HISSIN50]

I'd keep vac leak hunting, based not only on symptoms but also on the vac reading.

You really don't know that the car idles correctly when cold because you dont have a good warm idle to compare to. The cold idle goes through several steps of RPM.

I'm sure you'll find the answer in the surging idle sticky.
Good luck.