New engine start up, mixture?

R

Rapid

New Member

Mar 31, 2005

297

1

0

Columbia, SC

Dec 30, 2008

#1

• Dec 30, 2008

• #1

I have upgraded my engine from Edelbrock performer intake, cam, and Performer RPM heads with stock pistons, to Edelbrock performer RPM intake, Comp Cams XE268H, KB Flat top pistons. Do I need to make the mixture richer before I run it for 30 minutes at 2500 rpm? I don't want it too lean nor do I want to wash the oil from the cylinders by being too rich.

 

A

Arron Johnson

Banned

Dec 30, 2008

31

0

0

Sonoma, CA.

Dec 30, 2008

#2

• Dec 30, 2008

• #2

No, that carb should be fine the way it is. What you added wasn't THAT big of a jump and shouldn't require any mixture changes. You can keep an eye out for glowing headers during your cam break-in period, which is an indicator of a lean mixture, but you shouldn't have any issues.

 

woodsnake

15 Year Member

Jan 16, 2007

1,352

15

69

Hicksville, NY

Dec 31, 2008

#3

• Dec 31, 2008

• #3

Does that cam require adjustable valve train? Did you measure for proper pushrod length?

 

R

Rapid

New Member

Mar 31, 2005

297

1

0

Columbia, SC

Dec 31, 2008

#4

• Dec 31, 2008

• #4

rollers are staying centered on the valve stem so I think I am OK.