- Joined
- Nov 11, 2007
- Messages
- 7,796
Replace the camshaft. I'm not recalling saying don't do this, but I would have. Go with the 250-260 versions of compcams.
Read compcams own description, need a 2000rpm plus stall converter. High performance vehicle. You have either of those? This cam was designed for a light Camaro or mustang to do burnouts on the street, not be a drivable truck cam pulling 4000 lbs.
However, it should idle. Some others mentioned one nagging issue why it might not, not enough compression to run with the performance cam, resulting in as you noted 4 inches of mercury. 4, I would expect no less than 8-12 with a performance cam.
I don't think you have a vacuum leak or a carb issue, but, if you have another known good to you carb, might try running with that. Or take your carb and run it on another motor and prove it works or does not.
Then replace the camshaft with an RV type camshaft.
Read compcams own description, need a 2000rpm plus stall converter. High performance vehicle. You have either of those? This cam was designed for a light Camaro or mustang to do burnouts on the street, not be a drivable truck cam pulling 4000 lbs.
However, it should idle. Some others mentioned one nagging issue why it might not, not enough compression to run with the performance cam, resulting in as you noted 4 inches of mercury. 4, I would expect no less than 8-12 with a performance cam.
I don't think you have a vacuum leak or a carb issue, but, if you have another known good to you carb, might try running with that. Or take your carb and run it on another motor and prove it works or does not.
Then replace the camshaft with an RV type camshaft.