Center cylinders lean question.
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STR-LGL-70
Remines
6 posters
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Center cylinders lean question.
I am have a lean condition on the center 4 cylinders with a C460 manifold and C460 heads. the carb is a Gen 3 Holley 1425 CFM with 2.375" throttle bores. I am just wondering if other have had a similar issues and possible solutions for this. A different carb or manifold work? Any help would be great.
Thanks in advance for all of the information.
Michael Remines
Thanks in advance for all of the information.
Michael Remines
Remines- Posts : 22
Join date : 2016-03-10
Location : Troy. MO
Re: Center cylinders lean question.
I don't have an answer for you but was wondering if you have a carb spacer and if so which one?
Also, any port work on the intake?
Thanks, Sheldon G
Also, any port work on the intake?
Thanks, Sheldon G
STR-LGL-70- Posts : 223
Join date : 2009-08-06
Age : 61
Location : Daytona FL
Re: Center cylinders lean question.
Yes the manifold has a good bit of porting done to it. Yes I am running a 1" open spacer not tapered just straight.
Michael Remines
Michael Remines
Remines- Posts : 22
Join date : 2016-03-10
Location : Troy. MO
Re: Center cylinders lean question.
Are they lean, according to what the plugs look like?....or are you using individual cylinder 02 sensors?
BBFTorino- Posts : 997
Join date : 2015-12-31
Re: Center cylinders lean question.
I have the heads off and there is a big difference in the the center 4 as to the coners. You see it in camber and the cylinders.
Michael Remines
Michael Remines
Remines- Posts : 22
Join date : 2016-03-10
Location : Troy. MO
Re: Center cylinders lean question.
I’ve seen cylinder to cylinder issues on mine, if you have room try a stacking a few spacers
dfree383- BBF CONTRIBUTOR
- Posts : 14832
Join date : 2009-07-09
Location : Home Wif Da Wife.....
Re: Center cylinders lean question.
It may not have anything to do with a fuel distribution issue but I helped a guy on a bbc with a new gen3 Holley. Nothing we did would put enough fuel in the engine. Belt drive pump checked ok, air bleeds swapped with no affect. Finally sent to BLP for an extreme makeover to find out the metering block passages were too small. I recall them having that same problem years ago on another dominator carb. BLP metering blocks and it was a whole new animal!
cool40- BBF CONTRIBUTOR
- Posts : 7308
Join date : 2009-08-31
Age : 53
Location : on the 1/8 mile dyno
Re: Center cylinders lean question.
I spoke with my carburetor guy. We talked back and forth a few time and I sent him manifold plenum area pics. He feels there is something going on in the carburetor. i think i will look at this for now and see where it leads. I will let every one know what we find from here once engine is back together.
Thanks for the information and suggestions,
Michael Remines
Thanks for the information and suggestions,
Michael Remines
Remines- Posts : 22
Join date : 2016-03-10
Location : Troy. MO
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» lean cylinders?
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» 540 powerboat mill
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» 460 engine failure 800 miles street use
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