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Author Topic:   missing
vaseau55
Dirt Roller

Total posts: 7
posted April 23, 2002 11:02 PM
i am running a 358 w/991 heads and a 2 barrel.it souns and runs fine to about 5000.everything is new,from the oil pump to the carb.when i get about 3/4 down the straitaway on a 1/4 mile it really misses until i let off.i run a stock dist w/a new accel module.new carb,dist,plugs,wires,mwms#5cam@.030,lifters,pushrods, wont run worth a ****,built many motors but never had his prob, any help would be greatly appreciated. thank you

EVANSRACING24E
Dirt Forum Racer

Total posts: 80
posted April 24, 2002 12:05 AM
check your needle valve settings.mine did the same thing and i wasnt getting enough fuel.or maybe wrong jetting.

KPLugnut
Dirt Freak

Total posts: 408
posted April 24, 2002 07:58 AM
Just a thought, but are you sure you have enough valve spring pressure?

Also, check your fuel pressure as well, but that's less likely to cause your problem than weak valve springs.

Hope that helps,
KPLugnut

LUBEGUY07
Dirt Maniac

Total posts: 156
posted April 24, 2002 11:35 AM
i would have to say its your valve springs what kind are u using if your using z/28 stlye ones from midwerst motorsports they need to be changed after about ten night on them becouse they get weak after that. Also chech your distributor and make sure it isnt bad, i had one go bad this year already so i bought a new one from summit. if they have to much play in them it will not let u rev it up



cas23
Dirt Roller

Total posts: 17
posted April 24, 2002 09:56 PM UIN: 25501394
make sure the wire going in to your hei is big enough ive seen this cause high speed misses also. just look what size they run from the factory.

vaseau55
Dirt Roller

Total posts: 7
posted April 24, 2002 11:06 PM
thanks for all the help guys,i rewired and checked fuel pressure and my dist.everything checked out so i ripped her apart and put new springs and valves in her.well find out tomorrow nite if she'll go or blow! thanks again,randy vasseau #55

vaseau55
Dirt Roller

Total posts: 7
posted April 27, 2002 11:32 AM
valve springs,huge diff.started 18th and moved to 5th and ended op 8th.thanks guys randy vasseau #55

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