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Old 04-29-2013, 09:23 AM
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comformation on roller 383 pushrod length

hello!
im working on a roller 383 for a 57 chevy.
i ordered the block from summit,
im running edelbrock rpm 460 hp top end package.
i have been told that i need -.150" pushrods.
can anyone confirm this?
i really hate ordering the wrong parts!
thanks!

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Old 04-29-2013, 09:26 AM
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Any answers to that without checking valve train geometry would be a WAG.
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Old 04-29-2013, 09:40 AM
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You need a pushrod length checker, you can make one or buy a cheap one. Anyone who tells you a specific size is just guessing- you need a checker before you can order the size you need.
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Old 04-29-2013, 05:32 PM
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Quote:
Originally Posted by h0trod View Post
hello!
im working on a roller 383 for a 57 chevy.
i ordered the block from summit,
im running edelbrock rpm 460 hp top end package.
i have been told that i need -.150" pushrods.
can anyone confirm this?
i really hate ordering the wrong parts!
thanks!
I agree with 68NovaSS and ap72; this is the best advice you can get. You'll need the rocker you intend to use on this motor, a checking spring and a checking push rod. This has to be done with the heads on the block with the block assembeled at least with the crank assembly cam and cam drive installed.

When you start mixing non production parts even though the aftermarket parts may be fairly common it is not unusual to hit odd dimensions in the build up. So it just is not prudent to predict what push rod lenght will provide the proper sweep of the rocker on the valve stem. This, especially, can become a problem where stiffer than production valve springs are used along with a higher lift and perhaps a faster lift cam is used and/or 1.6 or more ratio rockers are used. These are things that increase the accelerations of the valve, spring, locks, and retainer as well as the general forces of the spring. Because of the extra speeds, motion, distance, and force involved the sweep of the rocker on the valve stem tip becomes more critical to where misses of location results considerable off center forces that want to bind the valve stem in the guide. This greatly speeds wear, mostly of the guides, but also the valve stems. When this happens the valve orbits on the seat taking more time to seal compresson in the cylinder and this motion breaks the abilty of the seal to hold oil out leting oil down the stem clearance. That oil not only reduces the fuel's octane but it cokes on the backside of intake valve adding weight and obstruction the incoming mixture. You don't have to hang out in this or other forums too much before you hear complaints about somebody's head being no good because the guides wore out in no time or worse an insert came loose; my experience says often as not these events are from not paying enough attention to the rocker sweep on the stem tip which often drives right back on pushrod lenght, so this is REALLY important.

So rather than just taking someones word for pushrod lenght, you are well advised to procure the proper tools and check out what is really needed for the built up dimensions your engine has.

Bogie
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Old 04-29-2013, 11:15 PM
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appreciate it!
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