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The set out of a ZZ3 mtr measured 7.194. Maybe the ZZ4's are different pushrods?
Does not quite make sense being as they both use the same cam, unless the ZZ4 uses a different leght lifter, which I doubt. Used a set of harden aftermarket pushrods in my ZZ3 mtr and they measured 7.200.
Assembled a 350 Vortec roller mtr and used shorter lenght Comp push rods at 7.150.
The zz-zz3 did have different pushrods. I forget the part number for the older stuff but they were for guide plates. The ZZ4 has self guided rockers which is why they changed them. From what I read both GM products are good. As for the length difference, not sure. Maybe different heads?
1985 Pontiac Firebird, ZZ4 with AFR 195's, Comp XR 288 cam, Mighty Demon 750 mech, reworked 700R4 w/3200 stall, B&M Megashifter, Griffin radiator, Dual BeCool fans, PST front bushings, Eibach 1.5" progressive rate springs, 373 locker rear, 4th gen black leather seats, 17" Boyd Coddington Smoothies wrapped in BFG Comp Ta rubber.
