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THUNDERBOLT19 04-24-2026 08:19 PM
489 build sheet?
 
Looking for anyone that’s built a 489. Have a 454 that’s 0.030” over with 4.25” scat crank and rods. Need to figure out pistons/heads/cam. Looking for any help to point me in right direction.

I have:
Holley 850
rect port dart single plane intake


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