Mainly using Holley/Demon carbs have only limited experience with Q-jets. Putting together a warm 350 and would like some advice to get me in the ball park. Car is a '48 Anglia approx 2600lbs, has 3.07 rear with 28'' tyres, an 11'' TCI converter and TCI prepped TH350. Engine specs:- '68 350 std bore 9.5:1, TA intake, TA 1 5/8 headers Cam:- Lunati, 215/225 @.050, lift .0468 int, .0493 exh, on 112*lobe centres. Got to tune the car with street use in mind, hence the use of the Q-jet. The carb is a '71 800cfm, which from reading this board seems to be the one to go for..... Thanks in advance Ian
A little more info... Just like to add... - Altitude is only approx 300ft and using an old Mallory dual point to light the fire, well for now. - Should I start with stock '68 jetting and go richer, if so approx how much? - Just want some idea so that when we first fire the motor after re-build it'll run no problems.. Thanks again Ian
Ian, Rule for Q-jet is when you go up 3 jet sizes, you go up one size in primary rod. If it has say .068 jets and 45B rods, and you go to .071 jets, go up to a 46B rod. Are you sure that the carb is an 800 CFM? The only 800 carbs were meant for 455's. Its Ok to put one on a radical 350, but with your combo, I'd stay with a 350 carb, which is a 750.
Hey Larry, that got me thinking about the 800cfm on the 350. Suppose you had a stock 350 and were using an 800cfm. Would rejetting solve any "problems" associated with too much carb? What do you think would be a problem in putting a carb with slightly more cfm on a 350? o No: A while back, I put an 800 on my stock 350 and it runs very well and gets 15mpg on the highway. I figured that was respectable. Unfortunately I just sold it for a more gas guzzling 455:grin:
Adam, The part throttle and idle calibrations are meant for a big block. You can get away with putting one on a 350 by jetting it correctly, but I wouldn't put a 350 carb on a 455. That was what I discovered when I bought my car. In your case it was no problem.
