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Your cart is empty. Specifications:
GRADE 8 HARMONIC BALANCER BOLT
1/2" - 20 Threads
1-1/2" Under Head Length
1/4" Thick Washer
Lock Washer
3/4" Hex Head
Fits:
Big Block Chevy 366 454 Engines
May Not Fit With Aluminum Pulleys , Check Dimensions !
Logan K.
April 30, 2025
a MARK IV 454 should be: 1/2 in.-20. (This bolt is not). I needed a bolt for the SBC anyways and the price is decent. I did not check the harmonic balancer pulley bolts.
Evan
February 5, 2025
good fit
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