Rockers necessary?
09-17-2009, 09:24 PM
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Rockers necessary? Just curious, when doing cam swaps, is it really necessary to change Rockers, push Rods etc?? Already bought new lifters and springs. Car has 74k miles.
09-17-2009, 09:56 PM
#2
Rockers are optional. GM stockers are pretty damn good - strong, light. May want to send to Harlan Sharp to modify the needle bearings. Check the swipe pattern on the valve tips to determine correct geometry.
However, push rods are a no brainer. First, they are cheap. Second, stock GM push rods are notoriously weak. Add a high lift, long duration cam to stronger valve springs and you'll need some high strength push rods.
Lastly, push rods may also be required in a different length as most cam manufacturers utilize a smaller base circle on the camshaft. Therefore, the push rods will need to be slightly longer to compensate for the reduced base circle compared to the stock cam. Always use a push rod checker to verify the correct length and lifter preload.
However, push rods are a no brainer. First, they are cheap. Second, stock GM push rods are notoriously weak. Add a high lift, long duration cam to stronger valve springs and you'll need some high strength push rods.
Lastly, push rods may also be required in a different length as most cam manufacturers utilize a smaller base circle on the camshaft. Therefore, the push rods will need to be slightly longer to compensate for the reduced base circle compared to the stock cam. Always use a push rod checker to verify the correct length and lifter preload.
09-17-2009, 11:07 PM
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Well which pushrods in particular and what lengths exactly? My motor is a LS1 v8 6 speed, mods are in the signature. Never upgraded pushrods so no idea right now, thnx
