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I was on the phone today with Crower. I asked what rockers they recommended? I was told to use 1.5 and 1.6 rockers. I'm just curious as to how many out there split the rockers on there sbc 400. Is there a preference or a least favorable brand of rocker?
Every engine combo is unique. You can experiment with 1.5 and 1.6 rockers on the intake & exhaust and see what your engine likes. You might only see a difference on the engine dyno though. Remember to check for adequate pushrod hole clearance in the heads before swapping on the 1.6 rockers.
Make sure that you use a long enough rocker stud so that your rocker is located on the stud and not on the threads, and has enough length to get good thread engagement for your poly-locks.
Installing roller rockers can create there own problems if you don't check the details.
406.th400.9 inch,lots of Duct tape.
Superglue is my friend
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Last edited by novamike; 21st-May-2007 at 10:02 PM.
I like the 1.5 exhaust and the 1.6 intake. There is more to it than just the difference in lift. The entire lift curve is changed by the rocker ratio. Most intakes need the quick lift to get the valve open and the flow started, most exhaust (except turbo) do not need that.
If the cam is not already too big, the intake 1.6 usually helps. One the exhaust, esp. automatic, the 1.6 doesn't seem to help or may even hurt performance a little.
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