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Author Topic:   high rpm miss
posted May 21, 2003 10:23 AM
I am running a 6" rod 355 with a hydrolic cam and rhoads lifters and midwest motorsports heads with 2.02-1.60 valves and Z-28 springs, 2bbl rochester carb and when it hits 5,000 on up it misses. I have tried every thing imaginable; ign. mod, cap, rotor, coil, plugs, wires compression tests 152lbs and up. I am stumped

posted May 21, 2003 10:34 AM
Lifters and valve springs. Change both and your skip will be gone. Rhoads lifters kill HP, and plain Z-28 springs won't have enough seat or nose (open) pressure for high rpm use.
Run good anti-pumpup hyd. lifters, and stock diameter springs that have about 110-135lbs seat pressure at installed height, and the valvetrain will handle it.
Long slot rockers (preferrably 1.6 ratio on the intakes) will do the job as well.
In the carb dept, make sure you're not too lean (or too rich) as a 2G carb is prone to flutter or blubber when the fuel supply is even a little off.
Hope all this helps, but I think you'll find the lifters and springs are your problems.


posted May 21, 2003 10:35 AM
I had asimilar response typed and by the time i submitted it KP already had...

[This message has been edited by dirtbuster (edited May 21, 2003).]

posted May 21, 2003 12:58 PM
What he said.

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