hot68rs

This is my first time on this forum but There seems to be a lot of people that have solved problems here. I just finished a 1969 Camaro with a crate zz502. The problem I am having is it misfires at cruising speed or under slight acceleration. Here are the specs;

Demon Triple D induction - Six Shooter
MSD 6al Box
Petronix 60,00 volt coil
AC delco #4 plugs
MSD Pro Billet Mechanical advance distributor #85551
Timing at 34 total

Runs well on full acceleration. I am thinking that the single two barrel, which it runs on most of the time is jetted to small or I have a spark problem somewhere. Everything is new. Thanks

kenSS

iTrader: (1)

it could be to lean. try jetting it up 2 sizes and see what happens. just a start.

hot68rs

Thanks. I will do that. Can't hurt. Will lean make it misfire or more like putter under light cruising or light acceleration say around 1500 - 2000 rpm? Thanks

deelong4002

iTrader: (8)

hot68rs

Thanks guys for your response. I jetted the middle carb up to 70 from 68 and it seemed to get a little better. It makes me feel that the problem is fuel. I was thinking about going to 74. Although I know I run 78's in my 68 small block 406 on a dual quad setup on the main carb. So maybe higher than 74? If that don't do it it may be something else. Any other thoughts.