So just had motor put in my 70 chevell early this summer, nice healthy ran great 540 horse 540 tq. Fully hyraulic roller, roller rockers, roller lifters, holley 750 double pumper, merlin 330cfm rectangular port heads, mechanical fuel pump, pump gas, etc.
Ran great, pulled hard past 3 grand all the way to redline, sounded smooth, left it sit in garage for 4 weeks while out of state, turned key without pumping pedal and fired right over and ran smooth.
Then one day took out do drive and noticed major power difference. Lost a lot of power. Did not sound the same running either. Would loose major power over 3 grand and would pop/backfire. Would diesel when you shut the car off, continue running or trying to. Noticed small rubber fuel hose (only rubber left) looked collapsed. adjusted valves, started and ran horrible, 180 compression on all cylinders except the one with 0 and no vaccum do to collapsed lifters. after fact dropped plunger on two roller lifters (bullet brand) replaced them with comp racing roller lifters. Drilled needles out in carb. Ran great for about an hour, then returned to as before.
Now the thing will barely start after sitting overnight, not even stay running while pedal is down until warm, run uneven, reeks of rich/fuel even though I was told by a speed shop the carb was "way leaned out", feels weaker, looses major power above 3 grand and pops/backfires when taken that high, and diesels when shut off. What the hell is wrong with this POS, i keep thinking it's a fuel issue, or, timing? What could it be?
I'm going to ditch the mechanical fuel pump, put a holley blue pump on with holley regulator, and if that fails I give up. I have a cummins diesel laying in my garage that I will, mark my words, put in the car to spite everyone.
Ran great, pulled hard past 3 grand all the way to redline, sounded smooth, left it sit in garage for 4 weeks while out of state, turned key without pumping pedal and fired right over and ran smooth.
Then one day took out do drive and noticed major power difference. Lost a lot of power. Did not sound the same running either. Would loose major power over 3 grand and would pop/backfire. Would diesel when you shut the car off, continue running or trying to. Noticed small rubber fuel hose (only rubber left) looked collapsed. adjusted valves, started and ran horrible, 180 compression on all cylinders except the one with 0 and no vaccum do to collapsed lifters. after fact dropped plunger on two roller lifters (bullet brand) replaced them with comp racing roller lifters. Drilled needles out in carb. Ran great for about an hour, then returned to as before.
Now the thing will barely start after sitting overnight, not even stay running while pedal is down until warm, run uneven, reeks of rich/fuel even though I was told by a speed shop the carb was "way leaned out", feels weaker, looses major power above 3 grand and pops/backfires when taken that high, and diesels when shut off. What the hell is wrong with this POS, i keep thinking it's a fuel issue, or, timing? What could it be?
I'm going to ditch the mechanical fuel pump, put a holley blue pump on with holley regulator, and if that fails I give up. I have a cummins diesel laying in my garage that I will, mark my words, put in the car to spite everyone.
