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#1 |
Registered Member
Join Date: Jan 2001
Location: Ojai, CA
Posts: 19
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![]() Well i have recently built a 408 stroker, and at high rpms (starting around 3,000 and getting worse as it revs higher) it seems to start dropping random cylinders or running rough. at first i thought it could be the carburetor (edelbrock 750) so i tried a holly on it, there was no change. i suspected intake valve float but a vacuum gauge showed steady vacuum at all rpms. is it possible that it could be spark plug blowout? i am really at a loss here but i hope to know before i start throwing money at ignition parts upgrades etc. so any help is appreciated! below is the specs on the engine
408w forged pistons, 10.25:1 compression, crane roller cam 224/232 duration .540/.560 lift 112lsa, edelbrock performer aluminum heads 2.02/1.60 valves. weiand stealth intake Mallory magnetic pickup distributor "stock" coil and wires from autozone. dual 2.5" exhaust w/ shorty headers. now the strange thing is, i have a jet boat with a high compression olds 455 in it, and it has the same problem! (rough above 3500 rpm at any throttle/load level)
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-1968 Mustang Coupe- 302 roller, gt-40Ys, E-303, t-5 |
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#2 |
Registered Member
Join Date: Jan 2001
Location: Ojai, CA
Posts: 19
|
![]() doesn't anybody have any ideas?
__________________
-1968 Mustang Coupe- 302 roller, gt-40Ys, E-303, t-5 |
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#3 |
Registered Member
Join Date: Dec 2006
Location: new york
Posts: 482
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![]() sounds like a coil
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347 stroker all forged,arp everything,stud mains w/girdle,7qt pan,full roller, custom cam, aluminum heads swirl valves 5 angle valve job.quick fuel 750,areomotive pump,cobras w/nitto drags,and m/t et drags for the track, ford racing 373 gears,centerforce clutch,tko500,underdrive pulleys,bassani x-pipe,flowmasters ^best et so far 11.6 1.61 60ft coming soon 9sec et's ![]() 1992 mustang gt 2001 gmc 1500 4x4 78 century boat 92 skidoo |
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