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Old 06-04-2010, 10:01 PM
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Small block pushrods

Whats the difference between hydraulic roller pushrods and standard pushrods? why cant I run standard 5/16 inch standard pushrods in my 1986 with roller cam and roller lifters?

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Last edited by dewane1; 06-04-2010 at 10:15 PM. Reason: forgot to say what kind of engine
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Old 06-04-2010, 10:06 PM
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Small block pushrods

Whats the difference between hydraulic roller pushrods and standard pushrods? why cant I run standard 5/16 inch standard pushrods in my 1986 350 chevy with roller cam and roller lifters?

Last edited by dewane1; 06-04-2010 at 10:29 PM. Reason: did not specify engine
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Old 06-04-2010, 10:23 PM
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Hi, and welcome.
I can't answer your question with any certainty, but I suspect there is a difference in length.

I also noticed that you have 3 (related) posts within a span of 10 minutes.
There is no need to do that. You can go back and edit your original post, or even submit a new comment in the original thread.
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Old 06-04-2010, 10:56 PM
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66GMC is right- the lengths are different. About 7.8" for a flat tappet, about 7.2" for the OEM roller.
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Old 06-04-2010, 11:37 PM
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chevy push rods

I'm running standard stock, rockers, just hydraulic roller lifters which as far as I can see are the same on the pushrod end and ebay lists 7 1/3 inch high grade pushrods, but they say not for roller cams, confusing, about 8 bucks apiece difference.
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Old 06-05-2010, 12:03 AM
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Quote:
Originally Posted by dewane1
I'm running standard stock, rockers, just hydraulic roller lifters which as far as I can see are the same on the pushrod end and ebay lists 7 1/3 inch high grade pushrods, but they say not for roller cams, confusing, about 8 bucks apiece difference.
There are MANY different length pushrods, depending on what they are supposed to fit, whether the valve train is OEM or modified, what machining ops have been done to the heads and/or block, etc.

I don't recall manufacturer's specifying the p-rod length by fractional measurement, i.e. 7-1/3", rather they would most often be listed as 7.333" length.

An OEM roller SBC from 1986-up through the Vortec L31 engine (about 2000) used 7.2" nominal length p-rods.

That said, the exact p-rod length depends on many variables, and should be checked so as to provide the correct geometry for the valve train.

If you would care to tell the forum what it is you are building and what parts you are wanting to use, maybe some useful info will be forthcoming.
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Old 06-05-2010, 06:02 AM
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GM hydraulic roller lifters are taller than flat tappet lifters. The corresponding pushrod is shorter. NO direct swap.
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Old 06-05-2010, 01:30 PM
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small block pushrods

Thanks to all for your information, ou were very helpful.
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