1970 Lt1 carb. settings

[al8apex]

What do you mean by you think it needs more fuel?

Is it running out of RPM?

I run a lot more initial timing that that (more than twice) but you need to know what your total advance is and when it is acheived.

I found the FACTORY jets to be WAYYYYYY to rich for my 1970 Z28 M22 with 3.73's for the street. But if you are only going to run it down the drag strip, your cylinder wall washing richness is ok there, but WAY too fat for the street IMHO and experience.

I took my stock primaries (70) and moved them to the secondaries (that WERE 76) and went to 68's for the primaries, lots more response, crisper and only on severe upper acceleration was it any different than the jets that kept on fouling my plugs during everyday street driving

you could take it to a dyno and get it dyno tuned, that's what they did back in the day

[todd micheal]

Thanks for the input. i had more timing but went back to stock and had to start some where. How do i figure total advance What size squirter do you use. Never have fouled a plug yet in 2000 miles, yes feels like the car could have more off the line. it pulls ok , wont break tires loose unless you drop clutch. car pulls ok and then kinda goes flat, stops pulling but keeps aclerating.

[al8apex]

sounds like your timing is one of your issues

I have the stock carb, 4555 780 cfm, stock accel pump

[al8apex]

the power valve should be 8.5:

http://www.mopar1.us/carbs.html

[todd micheal]

Yes that is the one thing i m going to do is change power value to 8.5 How do i set timing up like you have done with total advance. what is the stock squirter size?? Thanks todd

[markjohnson]

I can't believe it calls for a 8.5 Power valve! On a decent-sized duration camshaft, that PV would be opening early and fouling plugs. I think I'd go with a 6.5 PV. Get Eric's (Vintage Musclecar) advice on this.

[todd micheal]

Any idea what i could advance timing up to?? And from there i will get a vac. reading and split in half and pic power value.