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Old 11-02-2004, 02:11 PM
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high rpm mis

I have a newly rebiult 327 chevy bored 30 over flat top pistons with a .100 dome,327 350 horse cam 222@50 447 lift and exhaust,882 heads 1.94 1.50 76cc,power plus intake idle to 5500,750 holley vacum secondairies,stock disributor with pertronix eye in it. It starts and idles great,When i take it to the drag strip or even hotrodding on the street it starts missing about 5200,You can baby it and it will run 6000 with out missing you stand on it and it cuts out,I put all new steel braded fuel lines holley red fuel pump new gas tank,Carb is only one year old looks fine have taken apart and cleaned it.I was running a 2 inch spacer under carb took it off now car misses at 4000.Ive tried all diferent timing settings,jetting the carb nothing works.Any suggestions will be appreciated.I worked on this thing so much cant even remember if it ever ran wright.Im also running headers.This is in my 1955 2 door wagon,327,th350,456 posi.thank you.

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Old 11-02-2004, 02:15 PM
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welcome John..............moving this to the "engine" forum.

Sounds to me like your ignition is cutting out...........

Possible valve float...............
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Old 11-02-2004, 02:22 PM
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wel I am certainly not the engine expert but I would be taking a hard look at the distributor..high speed cut out can be a symptom of a worn distributor that allows the timeng to wander at high RPM..Main clue is that it seemd to run ok at "normal" Rpm...
I have tried most all of it and now do what is known to work..
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Old 11-02-2004, 03:08 PM
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Float or Distributor

Doc here

Sounds like possible Valve float to me. Contact your Cam's manufacturer and give them the spec's for your engine and ask if this may be happening...

Another thing you might want to look at, is distributor. The Non HEI's are usually not wide enough between the spark towers to Isolate the spark from surrounding plug towers, hence you get cross fire within the cap at extreme RPM...

If you have an old HEI and The space to install it, toss it in and see if the problem goes away...GM HEI's are good to around 7000 RPM's...without crossfire. (Why It has such a large large Cap)

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