Holley 670 tuning
Thread Starter
Instructor
Joined: Apr 2011
Posts: 151
Likes: 1
From: Cedar Springs MI
Holley 670 tuning
OK, I got a new Holly 670 after the 2 Edel 600's failed to idle.
they both ran great at WOT and part throttle but stalled and loaded up at idle.
Traded for a new 670 and it would stall after warm just putting it in gear.
I think I got that problem fixed...I bumped up the floats a bit. I haven't been able to test drive since...dropped ins for winter.
The question I have is, why would it ping now when the I stomp the gas?
Also, no power at all. timing is set at 8 degrees BTDC.
Do I need to play with secondary springs, larger jets, power valve???
I don't want to waste a lot of time and money doing things that may or may not work, is there an exact science to this??
I would have thought if anything it would be too rich out of the box.
here is what I have...
basically stock except for Comp Cam CL12-212, Edelbrock EPS intake,
stripped of emissions and Pacesetter exhaust.
3:55 or 3:73 gears??? not sure.
they both ran great at WOT and part throttle but stalled and loaded up at idle.
Traded for a new 670 and it would stall after warm just putting it in gear.
I think I got that problem fixed...I bumped up the floats a bit. I haven't been able to test drive since...dropped ins for winter.
The question I have is, why would it ping now when the I stomp the gas?
Also, no power at all. timing is set at 8 degrees BTDC.
Do I need to play with secondary springs, larger jets, power valve???
I don't want to waste a lot of time and money doing things that may or may not work, is there an exact science to this??
I would have thought if anything it would be too rich out of the box.
here is what I have...
basically stock except for Comp Cam CL12-212, Edelbrock EPS intake,
stripped of emissions and Pacesetter exhaust.
3:55 or 3:73 gears??? not sure.
Le Mans Master
Joined: Jun 2004
Posts: 6,231
Likes: 65
From: Seattle WA
St. Jude Donor '14
I'd take the time to ensure the timing curve is set per the timing sticky before doing anything else. Static timing is one thing - but if you've got sticking weights or a lazy advance curve that has a huge impact on power.
There is a science to carb tuning for sure, but it does involve use of an A/F meter
There is a science to carb tuning for sure, but it does involve use of an A/F meter
Safety Car
Joined: Mar 2009
Posts: 3,558
Likes: 4
From: Oakland California
I'd take the time to ensure the timing curve is set per the timing sticky before doing anything else. Static timing is one thing - but if you've got sticking weights or a lazy advance curve that has a huge impact on power.
There is a science to carb tuning for sure, but it does involve use of an A/F meter
There is a science to carb tuning for sure, but it does involve use of an A/F meter
Definitely check your timing, per the timing sticky, it will help.
Thread Starter
Instructor
Joined: Apr 2011
Posts: 151
Likes: 1
From: Cedar Springs MI
Race Director
Joined: May 2006
Posts: 18,737
Likes: 2,583
no they are referring to a thread on this site that is permanent, thus "sticky". It explains how to properly set up your timing curve. I will try to find it and add the link to this post.
http://forums.corvetteforum.com/c3-t...long-post.html
http://forums.corvetteforum.com/c3-t...long-post.html
Last edited by MelWff; Nov 22, 2011 at 12:18 PM.
