idle question - The 1947 - Present Chevrolet & GMC Truck Message Board Network

76bonanza · 04-19-2007, 07:49 PM

First I have a mild 355 Auto th400. How much should the idle drop from park to drive? Right now it idles around 950 in park and around 700 in drive is that about right?

**53burb** · 04-19-2007, 08:09 PM

that is about right....i think idle should be about 800 & drop to 600 in gear....i think 950 is a little high...

76bonanza · 04-19-2007, 08:32 PM

I have no choke on my carb and the little extra idle seems to help some.

**53burb** · 04-19-2007, 08:43 PM

yeah I forgot about that part....before I yanked my engine out, I didn't use my choke....it doesn't get too cold here in Phoenix for too long....

*rage'nrat638* · 04-19-2007, 08:49 PM

your in the ball park. adjust to suit taste.

just not so high it run's on after truning off..

and your tranny don't klunk from being to high.

mines right at 700 in drive. different cam, intake's and carb combo's will change this around a little.

Piece of Work · 04-19-2007, 08:58 PM

If it's working for you, leave it where it's at. I just increased mine for the same reason.

-Mark

04-19-2007, 07:49 PM	#1
76bonanza Senior Member Join Date: Mar 2003 Location: St robert Mo Posts: 2,001	idle question First I have a mild 355 Auto th400. How much should the idle drop from park to drive? Right now it idles around 950 in park and around 700 in drive is that about right? __________________ 1968 c10 lowered 3" 4" 355/Th400 built by Hatfield racing in joplin MO

04-19-2007, 08:09 PM	#2
53burb Senior Member Join Date: May 2004 Location: Queen Creek, AZ Posts: 1,010	Re: idle question that is about right....i think idle should be about 800 & drop to 600 in gear....i think 950 is a little high...

04-19-2007, 08:32 PM	#3
76bonanza Senior Member Join Date: Mar 2003 Location: St robert Mo Posts: 2,001	Re: idle question I have no choke on my carb and the little extra idle seems to help some. __________________ 1968 c10 lowered 3" 4" 355/Th400 built by Hatfield racing in joplin MO

04-19-2007, 08:43 PM	#4
53burb Senior Member Join Date: May 2004 Location: Queen Creek, AZ Posts: 1,010	Re: idle question yeah I forgot about that part....before I yanked my engine out, I didn't use my choke....it doesn't get too cold here in Phoenix for too long....

04-19-2007, 08:49 PM	#5
rage'nrat638 Account Suspended Join Date: Mar 2003 Location: THE FALL GUY CHICAGO IL Posts: 5,883	Re: idle question your in the ball park. adjust to suit taste. just not so high it run's on after truning off.. and your tranny don't klunk from being to high. mines right at 700 in drive. different cam, intake's and carb combo's will change this around a little.

04-19-2007, 08:58 PM	#6
Piece of Work Cultural Infidel Join Date: Jan 2007 Location: Clearwater, FL Posts: 668	Re: idle question If it's working for you, leave it where it's at. I just increased mine for the same reason. -Mark __________________ posted via La-Z-Boy -Mark 1972 C-10 Fleetside 350/TH350 PS PB A/C Cab Sadly....Sold 1968 Short Fleet 350/TH400 PS PB Delivered by Fine69 Also sadly Sold! It may be that your whole purpose in life is simply to serve as a warning to others. A man is not complete until he is married -- then he is finished.



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