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Customer q:

I'm replacing the heads on my stock 5.6 vortec 350. I want to use the Chevrolet Performance 12558060 SBC Cast Iron Vortec Cylinder Head 170cc Intake Ports and the Comp roller tip rockers self aligning. Can I use 1.6 ratio with the stock heads and without modifications or will I need to stick with the 1.52 ratio?? What rocker arms part # will work with my application? Will I need to measure for new pushrods or is there a kit with roller rockers and pushrods for this application? Thanks


ac = Yes

drivewheel = 4WD

engine = 5.7 V8 Vortec

fuel = Fuel Injected

make = Chevy

model = K1500 Suburban

pwrbrk = Yes

pwrstr = Yes

trans = Automatic 4L60E

year = 1999


Max valve lift is .475. If using a 1.6 rocker puts you over this with the cam, you have chosen you will need to use 1.52 stock length pushrods will be used with factory roller cams.

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auto car parts help
Posted on
March 26, 2018

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