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Old 11-16-2005, 02:14 PM
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fuel wash edelbrock rpm heads

hi
i got a used set off edelbrock heads for my chevy 383
the chambers of the heads weren't cleaned

if i see in the combustion chamber there is a clear spot
on the heads wall near the plug and under the intake valve
the heads are 70 cc

as far as i know from the head porting books this is fuel wash
and will be bad for performance.



i cleaned up the other head by light grinding ,unshrouding the valves
and made the ports even width
maybe the unshrouding would help

what can i do to prevent this or is this normal

thanks
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Old 11-17-2005, 10:11 PM
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Get your heads on a flow bench and see whats going on.
Index your plugs.
Be sure your timeing is properly indexed.
Check fuel flow in your intake.
Let me know what happens.
P.S. Do not over polish those heads until they are flow tested. LOU
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Old 11-18-2005, 07:49 AM
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Probably just a tuning issue or a type of fuel additive he was using.
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Old 11-18-2005, 09:57 AM
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thanks for response

i dont got or know somebody with a flow bench over here.
i am not going to polish the intake only the chamber and ex port

i bought the heads used so i didnt know what the other owner off the heads
did with it or how it was tuned

thanks
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Old 11-18-2005, 10:13 AM
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It's best to read the combustion process off the top of the piston, not the head. That area of the head would be a high velocity area and I don't think your seeing anything abnormal.

A flow bench is not going to tell you anything except what the heads flow. You'd need to wetflow the head and very few of those types of machines are out in the field.
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