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Old 08-06-2011, 01:40 PM
63chevy 63chevy is offline
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is back fireing normal for cold motor

hi i have a 1963 pannel van(4160lbs)
i resently have a machine shop build a motor
for me ,blue print balanced,and bored

469 (454)
roller cam howard 0 lash
10.5 pistons
598 horsepower
582 tork
400th
830 cfm
373 rear end grear
vac plugged on carb and distrib.
i had the timing at 38 degr.
now it's 34 deg runs better and cooler now
when its cold it back fires a little (very little)

driving down road when under 180' (temp) it does it
when 200deg it runs fine fine
and the oil temp is at 70 psi when temp is at 200 it drops to
40 ( in has a high per pump.)
any thoughts thanks

Last edited by 63chevy; 08-06-2011 at 01:55 PM.
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