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crane 741 cam and stock roller lifters

Old 07-14-2014, 02:04 PM
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Default 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?
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Old 07-14-2014, 03:20 PM
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Do what Crane says.
MY 2¢

With my 741 I used Crane lifters, springs, rockers they recommend.

Last edited by Rattlesnake Jake; 07-14-2014 at 03:22 PM.
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Old 07-14-2014, 04:23 PM
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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
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Old 07-14-2014, 04:31 PM
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I used a set of stock lifters on a .625 lift cam and they worked fine. Just make sure that they do not hit the retainer plate at the top of the lift and make sure they don't go below the plate when on the base circle.
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Old 07-14-2014, 05:07 PM
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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.

Last edited by rmbuilder; 07-14-2014 at 05:10 PM.
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Old 07-14-2014, 06:41 PM
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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.
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Old 07-14-2014, 06:54 PM
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I am asking as this is the set up in a 502 I bought here a while back. The engine was professionally assembled from what I was told but before putting this one into service I wanted to get this figured out.
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Old 07-14-2014, 06:58 PM
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Baja,

Email me a photo and I will let you know what you have.

Bob
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Old 04-10-2019, 01:01 AM
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Which lifter would work for the 741 in a gen VI? Do i really have to spend 800 bucks for lifters???
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Old 04-10-2019, 06:46 PM
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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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