Carb tuning help

Carb tuning help

Thanks for the responses, guys. I like the Eddy carbs for their street manners and drivability, so I appreciate the help. Plus, being able to change jets without draining the fuel is a plus. :)

dodge freak said
Is it electric choke / those are jetted leaner. I agree the Carter / Edelbrock carbs are better for idling...the Holley can be made to idle very well but the Edelbrock carb will always be a bit better.

The secondaries may need to be jetted richer..maybe my eyes are shot but I can not see those tiny numbers on the jets. I use wire drills and a mic to find the size I want. Small changes make a big difference and both the primaries and secondaries need to be right for best power.

Try going up .003 on the secondary jets..might need to go .006...each jet is .003 larger.

This carb does have the electric choke, so it is set up a bit leaner. I'll try bringing the primary jets up a size and a size or two on the secondary side.

fishy68 said
If it doesn't ping with the Holley but does with the Eddy it's most likely just running lean. That's providing the Holley wasn't running so pig rich it drowned out spark knock. Generally when you jet a carb up you should do all corners, not just the front's. Otherwise you have an imbalance. Try jetting up the secondaries too and see what happens. I have noticed every Eddy I messed with was jetted pretty lean out of the box.

BTW: What's your timing set at? I have a 360 very similar to yours (9.8 to 1, mild ported X heads, Lunati 60404 cam which is one size bigger than yours) and mine won't tolerate any more than 34 degrees total timing on 93 octane.

I'll have to recheck, but I'm pretty sure it's set at 34 degrees. I DO have a heavy spring on the advance mechanism, so it could be possible that it's advancing more than I think it is higher in the rev range.

64physhy said
Like dodge freak said, the electric choke eddy's are 2 sizes leaner than the manual choke ones. For what you have though, a 600 might not be enough.

Yeah, it is the electric choke version. Now that I think of it, I think I remember seeing a chart for carb vs. cam size, and the Eddys did seem to recommend larger carbs than Holley does with their double pumpers. IE: Edelbrock would say to use their 750AFB for this cam vs. Holley saying to use a 650 DP. Maybe I should try to jet this carb a few sizes up with the expectation of going to a 750?