477 BBC HIGH RPM MISFIRE
#1
Junior Member
APPRENTICE
Thread Starter
Join Date: Nov 2006
Location: Quincy, IL.
Posts: 14
477 BBC HIGH RPM MISFIRE
I have been fighting this for long enough... 477 BBC Dart pro 1 heads, Roller, 13:1, BG 400 pump (new), Quick Fuel 1050 Alch, MSD Distributor ignition.
Between the 1 -2 shift the car started popping slightly, steadily got worse. EGT was reading high. Put larger jet in carb. Kept getting worse as time went bye. Don't race alot so a few weeks go bye between attemts to cure. Thought it was a fuel delivery problem. Ordered new BG 400 pump and 4 port reg. Installed but no cure. Got up to almost 200 jets and still had hot EGT temps. Winter came a I said I'll see you next year.
Ordered new valve springs and installed. Went out today and problem still there. Any other things I am missing? I am probably looking over the problem so don't be afraid to mention some silly questions at this point.
Thanks in advance.
Between the 1 -2 shift the car started popping slightly, steadily got worse. EGT was reading high. Put larger jet in carb. Kept getting worse as time went bye. Don't race alot so a few weeks go bye between attemts to cure. Thought it was a fuel delivery problem. Ordered new BG 400 pump and 4 port reg. Installed but no cure. Got up to almost 200 jets and still had hot EGT temps. Winter came a I said I'll see you next year.
Ordered new valve springs and installed. Went out today and problem still there. Any other things I am missing? I am probably looking over the problem so don't be afraid to mention some silly questions at this point.
Thanks in advance.
#5
Senior Member
RACING JUNKIE
Join Date: May 2003
Location: Coldwater, MI
Posts: 2,998
Originally Posted by bajaboat32
I have 8 to 9 lbs of fuel pressure. When I started changing jets, The EGT did not change or got worse. I am i at 1335 degrees and only running 1/8 mile.
Which VP fuel the normal m1 or m5 ?