350 rocket back fire at w.o.t
#1
350 rocket back fire at w.o.t
my 350 rocket is stock except the cam msd system and carb and it runs fine until I give it full throttle from a stop or from around 30 mph I know my exhaust choke block off has a leak can that cause it I drove it at w.o.t on the interstate before the leak started now at w.o.t it back fires and tries to die
carb is a holley 4150 600 cfm d.p
carb is a holley 4150 600 cfm d.p
#3
[QUOTE=farmer52;963736]Sticky valve?[/QUOTEi
the carb is a bit to big and I had it set to lean I cured the rolling w.o.t I'm still trying to figure out the off idle stumble and backfire
the carb is a bit to big and I had it set to lean I cured the rolling w.o.t I'm still trying to figure out the off idle stumble and backfire
#4
All the stuff I have read about double pumpers said you need a high stall or manual transmission since the secondaries open immediately and the engine can't use the available air/fuel at low RPM.
#5
the stock worn out 500 cfm 2 barrel Rochester would boil the hides the 600 4 barrel wont it stumbles
Last edited by 72delta88; October 27th, 2016 at 10:22 AM.
#7
it got 1 so its just a dual feed I got most of the hesitation fixed carb was to lean itll chirp the tires now but it still gets smoked by the ols 2 barrel it still pops out the carb when I hit it to full throttle when cold but the exhaust choke block off is leaking air so I can get it tuned in
Last edited by 72delta88; October 27th, 2016 at 02:14 PM.
#8
#12
the 2barrel was dumping gas and the body was warped and the local parts store couldn't get a 2 barrel for 2 weeks and it was 50$ more then the 289 I spent on the 4 barrel I'm changine to a 4 barrel intake in January when I sprayed either at the carb base the only leak was the exhaust choke so its causing it to run lean
#16
Gettin' on er' and puttin' er' up to 6500 RPMs isn't going to help it much either haha!!
I'd think about gettin' on something else if you have that much energy, maybe somethin' in the back seat. Jus' sayin'
I've wipped springs out of back seats back in the day, pffft while flyin'
Put-er-ther
Eric
I'd think about gettin' on something else if you have that much energy, maybe somethin' in the back seat. Jus' sayin'
I've wipped springs out of back seats back in the day, pffft while flyin'
Put-er-ther
Eric
Last edited by 76olds; October 29th, 2016 at 07:02 PM.
#18
Gettin' on er' and puttin' er' up to 6500 RPMs isn't going to help it much either haha!!
I'd think about gettin' on something else if you have that much energy, maybe somethin' in the back seat. Jus' sayin'
I've wipped springs out of back seats back in the day, pffft while flyin'so its not accurate
Put-er-ther
Eric
I'd think about gettin' on something else if you have that much energy, maybe somethin' in the back seat. Jus' sayin'
I've wipped springs out of back seats back in the day, pffft while flyin'so its not accurate
Put-er-ther
Eric
#19
#21
yea not the best way to go I know but the car was on the side of the road and it was 2 weeks before the parts store could get a 2 barrel I'm goin to a 4 barrel intake longtube headers and dual 2.5 in exhaust in december
Last edited by 72delta88; October 31st, 2016 at 01:34 PM.
#22
Have you got the cam/chain sorted out?
#23
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