crane 741 cam and stock roller lifters
#1
crane 741 cam and stock roller lifters
I am wondering if it is OK to use the stock style lifters in a gen vi 502. The cam installed is crane 168741. .610/.632 lift. Crane says to use crane lifters with lift over .570.
Are they just trying to make money or are different lifters required?
Are they just trying to make money or are different lifters required?
#3
MarineKinetics
Platinum Member
Baja,
The GM OEM roller lifter will accept a range value of 0.326” lobe lift (0.555” valve lift) to .335” lobe (.6035” valve) to insure the lifter body will not drop below the base of the retainer plate when the lifter is on the base circle. If you attempt to utilize an OEM lifter to a .372” lobe cam you will need to mock up the engine to finished spec and validate that dimension.
Bob
The GM OEM roller lifter will accept a range value of 0.326” lobe lift (0.555” valve lift) to .335” lobe (.6035” valve) to insure the lifter body will not drop below the base of the retainer plate when the lifter is on the base circle. If you attempt to utilize an OEM lifter to a .372” lobe cam you will need to mock up the engine to finished spec and validate that dimension.
Bob
#5
MarineKinetics
Platinum Member
It’s important to differentiate between stock style lifters.
The GM OEM stock lifter is problematic due to the shorter body and likely will not have the dimensional length to accommodate the specified cam. Many of the Mercury Marine stock lifters are actually the Crane/Morel .300” long body lifter which is compatible with a .372” lobe lift on the Crane Cam.
The GM OEM stock lifter is problematic due to the shorter body and likely will not have the dimensional length to accommodate the specified cam. Many of the Mercury Marine stock lifters are actually the Crane/Morel .300” long body lifter which is compatible with a .372” lobe lift on the Crane Cam.
Last edited by rmbuilder; 07-14-2014 at 05:10 PM.
#6
The other thing to keep in mind is that the stock hyd lifters may not be able to handle the increased spring pressure required for proper valvetrain stability with a cam that has that kind of lift. The stock lifter also has a relatively small wheel on it. My advice is to spend the money now and get your valvetrain set up properly. You will regret it if you "cheap out" in this area. Ask me how I know.
#10
Registered
iTrader: (7)
Members been having good luck with the Johnson's. Do to the number of hyd roller failures you don't wanna go cheap. People will recommend what they've had good luck with and that's good. Isky Red zones, morels, crower sd hippo, cranes iskys gonna have to dig in a little deeper.
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Faster Daddy (01-25-2022)