SeanP
Donation Time
So I have been having some rough idle issues and the car has not wanted to idle after driving when coming off throttle. I have checked float levels replaced the carb/manifold gasket and tried to adjust the air fuel mixture but have not had any success.
I have had a couple of gurus look at it and both commented that they felt that it wanted more air fuel but we are running out of screw to turn at 3.5 turns.
My engine was bored 30 over, has a moderate cam and had the heads ported and over sized valves (i believe exhaust only), headers, and is currently running a 390 cfm 4160 holley. I was told that I prob needed to up my primary jet size by 4 or 5 and just wanted to see what you guys are running. The 4160 came stock with a 51 currently it has 57's. Does that make sense for the jets to be 10-11 sizes over the suggested jet size for the stock motor?
thanks
also what vacuum pressure should i see at idle? Is there a good service manual for this motor out there?
I have had a couple of gurus look at it and both commented that they felt that it wanted more air fuel but we are running out of screw to turn at 3.5 turns.
My engine was bored 30 over, has a moderate cam and had the heads ported and over sized valves (i believe exhaust only), headers, and is currently running a 390 cfm 4160 holley. I was told that I prob needed to up my primary jet size by 4 or 5 and just wanted to see what you guys are running. The 4160 came stock with a 51 currently it has 57's. Does that make sense for the jets to be 10-11 sizes over the suggested jet size for the stock motor?
thanks
also what vacuum pressure should i see at idle? Is there a good service manual for this motor out there?
Last edited: