? idle speed ?

[ryan_pope]

For my 1964 buick nail head, 425 cubic inch engine:::

I want to know the idle speed(s) for the engine : At cold engine start (rpm): ? and at hot engine rpm: ?


I don't know the respective rpm's of the engine. I plan to put my test light on engine this weekend and adjust the idle speed to OEM specifications. that is why I want to know the idles speeds, please.

[ryan_pope]

I spoke to two experts who agree....

Fast idle on the cam of carb = 1800 - 2200 rpm ; Best is 1600

hot idle ; 600 - 650 in neutral AND 525 - 550 with the transmission in gear.

[bobc455]

I know I'm late to the game on this thread, but I would much rather focus on:
- Maximum vacuum at idle
- Correct timing at idle
- Correct mixture at idle

Then you can play with the idle speed from there. But I would try to adjust the others as best you can first.

-Bob C.