stock valve locks
07-13-2013, 07:26 PM
#1
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stock valve locks so I'm doing a heads and cam swap and I've run into a slight problem. ms4 cam ported 799's with prc .675 dual valve springs. which valve lock should i use or are the stock ones ok to use? Tsp looks like they want you to use stock locks...any suggestions?
07-14-2013, 11:16 AM
#4
You might wanna ask TSP. The stock locks will hold but do not put them in a retainer
designed for the 7* locks.
Brain Tooly has a thread somewhere in here touting the advantages of a stock lock.
designed for the 7* locks.
Brain Tooly has a thread somewhere in here touting the advantages of a stock lock.
07-14-2013, 03:43 PM
#6
Here you go
You can tell the difference in how easy the valve is allowed to rotate with the stock locks versus machine locks by simple holding a valve in one hand, while pulling on the retainers and locks with the other hand and twisting.
We found the valve tips with the stock locks fared better during the durability testing versus the machined locks. It works much like how flat tappet lifters must spin in the lifter bore on a camshaft. If they don't rotate, they wipe out fast.
Of course open spring pressure had FAR more influence on valve tip durability than valve rotation, but it goes hand in hand.
We found the valve tips with the stock locks fared better during the durability testing versus the machined locks. It works much like how flat tappet lifters must spin in the lifter bore on a camshaft. If they don't rotate, they wipe out fast.
Of course open spring pressure had FAR more influence on valve tip durability than valve rotation, but it goes hand in hand.
