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Old 10-19-2007, 08:57 AM
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GM hyd roller lifters and .540 lift

Has anyone used GM factory hydraulic roller lifters with a cam that has a .360 lobe lift/.540 at the valve? I have heard rumors that the stock lifter may fall below the guide when on the base circle of the cam(not good). Crane makes longer travel lifters for this application but they are over $500...YIKES!

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Old 10-19-2007, 06:12 PM
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I can`t say I heard of what your discribing, If there was a issue it seems the cam company would notify one in the instructions or if in any doubt contact the cam company. Comp sells a cam with .600 lift for use on stock roller tappets. Ultimately check the clearence yourself when you assemble it.
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Old 01-30-2008, 05:20 PM
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Sorry to resurrect a somewhat old thread, but I have the exact same issue that the OP had and I was hoping for some more information on the subject.

I have a late-model 350 SBC (factory roller cam) that I am using for a 383 build. When speaking to a tech at Crane about a cam recommendation, he advised me not to use stock GM lifters for any cam with more than ~.480 lift (1.5 rockers) because they are more likely to fail after that point. He recommended the same lifters mentioned above, which are $535 from Summit. Here is the Crane listing for those lifters:

http://www.cranecams.com/index.php?s...&lvl=3&prt=117

Quote:
Long travel design for 87-98 blocks originally equipped with hydraulic roller cam and lifters. A necessity when camshafts have greater than stock lobe lift or reduced base circle diameter. For use with standard GM alignment bars.
I haven't seen any comparably specified lifters from Comp or any other big-name valve train companies that I have looked into. So I'm wondering, is this really a necessity? Or was the Crane tech simply trying to sell me a really expensive set of lifters? Crane has another set of lifters in their line for a little over $200, which is comparable to most others that I have found from Comp, et al. My phone call with Comp was cut off mid-way through thanks to my cell phone dropping the call and I haven't had time to contact them since.

A good question to ask others here would be: Has anybody used stock GM roller lifters on a cam with valve lift in excess of .480" and had any problems?

Thanks for any information you guys can provide. I will of course check this upon assembly, but I'd rather not have to go through the hassle of returning and re-ordering lifters should I find something wrong; I'd like to try and get the correct lifters the first time.
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Old 01-30-2008, 06:22 PM
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I used a new set of GMPP hydraulic roller lifters in this 383 build. The cam has a 1.15 base circle(standard for this lobe) and .360 lobe lift(.540 at the valve). The lifters do not fall below the top of the guide when on the base of the lobe and all is well so far!

I bought the kit from SDPC for around $200 which includes the liters,retainer,guides and bolts.
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Old 01-30-2008, 11:51 PM
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Cool, thanks for the information GMC. I'll have to check to see what the base circle is on these cams I'm looking at.

What kind of RPM does your new 383 normally see?
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