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Old 02-07-2009, 04:09 PM
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Questions on oem roller lifters for 5.7 chevy

Hello guys I am building a new 350 chevy 1 piece rear main seal engine and I am going to use a roller cam. I have never bought any oem roller lifters before and I don't know what ones to get brand name wise.

First of how high can they be reved to until pump up? I know that antipump up hydraullic lifters are good too 6500 rpm but what about oem hydraullic lifters? Also the ones I was looking at are the GM OEM roller set from summitracing that also includes the spider rack bar and dogbone retainers to go with them.

I am getting a comp cam xtreme energy HR 270hr 270/276, 218/224@ 50 with 495/502 lift. What is the highest amount of lift the oem rollers can handle before the lifter can get to far down the bore to where the retainer won't be able to hold it in place?

I know the GM hot cam has more lift then that so I should be ok but would like to know if anyone can help with info.

Thanks Eric

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Old 02-07-2009, 04:27 PM
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I used the stock lifters on a comp cam with 230/236 duration @.050 and .510/.520 lift with no problems. (XR282HR)
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Old 02-07-2009, 04:30 PM
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I always used the stock lifters after checking and cleaning them and I`ve not had a issue.
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Old 02-07-2009, 04:34 PM
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Hey cool thanks guys. I am going to go with the GM roller set up that comes wih all the lifters and the spider rack etc and for $220 bucks you can't beat the price. Hope they go up to 5500 rpm with no issues. Thanks guys
Eric
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Old 02-08-2009, 12:45 AM
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There's an article in October 07 CarCraft ( The Secret of Cheap Roller Cams ) That has all the Info. According to Crane cams Director of Valvetrain R&D Mark Cambell valve lifts of more than .530" at the valve w/1.5 rocker can allow the lifter to fall deep enough into the lifter bore (because of the lobe's smaller base circle) that the steel retainer can lose it's grip on the lifter body. Crane sells long travel OEM style lifters to eliminate the problem, but they're expensive compared to stock lifters.

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Old 02-08-2009, 08:30 AM
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Hello thanks for the info but I am not using a small base circle cam just a standard size. I am not making a stroker 383. I will have to keep that in mind but my cam will not have over 502 lift. I know the gm hot cam has over 525 lift and it works with the oem rollers just fine. Thanks guys for input.
Eric
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Old 02-11-2009, 01:36 AM
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The GM Hot cam uses 1.6 rockers to get that .525" lift. Lift with standard 1.5 rockers is only .492".
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Old 02-11-2009, 06:31 AM
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If you haven't bought them yet get a set of LS7 lifters ($100) or CTSV lifters ($300) for increased valvetrain stability at higher RPM. For a lot fo guys its the steal of the century.
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Old 02-11-2009, 10:09 AM
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Quote:
Originally Posted by eric32
Hello guys I am building a new 350 chevy 1 piece rear main seal engine and I am going to use a roller cam. I have never bought any oem roller lifters before and I don't know what ones to get brand name wise.

First of how high can they be reved to until pump up? I know that antipump up hydraullic lifters are good too 6500 rpm but what about oem hydraullic lifters? Also the ones I was looking at are the GM OEM roller set from summitracing that also includes the spider rack bar and dogbone retainers to go with them.

I am getting a comp cam xtreme energy HR 270hr 270/276, 218/224@ 50 with 495/502 lift. What is the highest amount of lift the oem rollers can handle before the lifter can get to far down the bore to where the retainer won't be able to hold it in place?

I know the GM hot cam has more lift then that so I should be ok but would like to know if anyone can help with info.

Thanks Eric
Does your block have the provisions for a roller cam? Not all one piece seal blocks are designed for a roller cam.

If your block isn't designed for the OEM roller then you're going to have to make some compromises at the lifter and the use of GM V8 rollers is out the window.

Bogie
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Old 02-11-2009, 06:39 PM
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Yes my block is already setup for roller lifters. I am getting a new L31 350 one piece seal 4 bolt main block from summit racing in a few weeks. I know it will handle the cam I am using just fine but will check things over just to make sure.
Eric
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Old 02-11-2009, 06:57 PM
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How can I use LS 7 lifters in a Gen 1 SBC block? Do they have the .842 bore diameter? This is the first I have heard of 8000 rpm hydraullic lifters going to that high of an rpm. But I only need hydraullic roller lifters good to 6500 rpm max and will last a long time with now worries and handle a good amount of lift.
Eric
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Old 02-11-2009, 07:00 PM
How fast is fast enough?
 
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To use them you drop them in the retaining spider- viola!. CTSV lifters are the best, but they're about $300.
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Old 02-11-2009, 07:03 PM
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Heck only $300 is a heck of a lot cheaper then retrofit roller lifters and I bet the CTSV lifters are a lot better too.
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Old 02-12-2009, 09:41 AM
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Quote:
Originally Posted by eric32
Yes my block is already setup for roller lifters. I am getting a new L31 350 one piece seal 4 bolt main block from summit racing in a few weeks. I know it will handle the cam I am using just fine but will check things over just to make sure.
Eric
That makes life a lot simpler.

Bogie
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