zz4 cam, vette heads and 1.6 rockers
Thread Starter
Junior Member
Joined: Apr 2001
Posts: 83
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From: Blacklick, Ohio, USA
Car: '91 RS
Engine: 5.7 tbi
Transmission: 700r4
zz4 cam, vette heads and 1.6 rockers
I want to swap some '88 aluminum D port heads from a 88-up vette when I do a ZZ4 cam swap. I also have some 1.6 rockers I'd like to put on.
After cleaning up the heads and probably some porting, is there anything I should look for or work on to avoid problems with that lift of cam and the 1.6 rockers.
Any advice would be appreciated.
Thanks,
GC
After cleaning up the heads and probably some porting, is there anything I should look for or work on to avoid problems with that lift of cam and the 1.6 rockers.
Any advice would be appreciated.
Thanks,
GC
Supreme Member
Joined: Sep 2001
Posts: 6,111
Likes: 53
From: Ontario, Canada
Car: 1988 Firebird S/E
Engine: 406Ci Vortec SBC
Transmission: TH-350/3500stall
Axle/Gears: 7.5" Auburn 4.10 Posi-Traction
The hole where the pushrod passes through the head
may need to be elongated for 1.6:1 rockers.
May need a better valve spring. Check retainer to guide boss top (or valve seal) at full lift. +.060" clearance minimum.
The 1.6 rockers will probabily only be needed on the intake side.
may need to be elongated for 1.6:1 rockers.
May need a better valve spring. Check retainer to guide boss top (or valve seal) at full lift. +.060" clearance minimum.
The 1.6 rockers will probabily only be needed on the intake side.
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