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Old 07-02-2010, 10:03 PM
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comp ratio conundrum

What comp ratio can i expect when i combine a "6781" oval port head with a KB ICOA fordged 23cc dome stroker (489) piston. Iv heard the 6781 is either a 113 or 119 chamber.

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Old 07-02-2010, 10:07 PM
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comp ratio conundrum

Sorry the moter im refering to is a 1978 454 BBC,stroked to a 489 (030 overbore)
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Old 07-03-2010, 12:47 AM
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Old 07-03-2010, 06:32 AM
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should measure the chamber to know for sure.

my 781's are 122cc.
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