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05-16-2004 09:05 PM #1
CHR Member
- Join Date
- Dec 2003
- Location
- Festus
- Car Year, Make, Model: 75 GMC C-15
- Posts
- 342
781 heads
Ive got a 75 454 that has casting #781 heads on it. Im trying to find out the cumbustion chamber size of these heads.
Mortec says 118cc.. while my Federal mogul/SpeedPro catalog & a big bloc Chevrolet book I have shows that that # is 110 cc. If anyone knows for sure, or has more sources please let me know. John75 GMC C-15 factory 454, automatic, lowered
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It would be nice if this up and down crap would cease.
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