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Standard Main Jet #851/4-32" Thread
JJ300F8-4030-5
3-point mounting to the head positions the alternator to the inside of the driver side valve cover
To assure proper piston ring end-gap
They are self-priming and self-regulating at 9-11
Steel Harmonic Balancer RO0208 Product:Suit BB Chev 427-502, Ext Balance Standard Main Jet #851/4-32" ThreadSteel Harmonic BalancerSuit BB Chev 427 502, Ext Balance RO0208 0208 Harmonic Balancers: All Romac Harmonic Balancers are SFI 18. 1 spec approved. These are offered in four styles. All 360 degreed and fully encapsulated outer rings via a shoulder at the rear and a serviceable circlip mounted at the front of the outer ring. All Romac Balancers are Individually Consecutively Marked, fully serviceable and need no special bonding with the elastomer.
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