small block push rods
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small block push rods - 3/2/2008 5:44:12 PM
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78buckshot
Posts: 653
Joined: 1/28/2007
From: Michigan
Status: offline
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Have any of you had to use push rods other than stock length when building a motor? I'm puttin' together my 383 with cast iron heads, stock deck height on the block, Comp cams Extreme Energy flat hydraulic, Comp cams roller tip rockers. The factory rods are 7.80 inches, I want to get a push rod length checker but I don't know if I'll be needing longer or shorter than stock. The tools are either 6.80-7.80 or 7.80-8.80, it's kinda' like a micrometer with a limited travel to check the correct valve train geometry.
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RE: small block push rods - 3/2/2008 6:05:07 PM
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78buckshot
Posts: 653
Joined: 1/28/2007
From: Michigan
Status: offline
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The heads are stock and didn't need to be milled. The cam is an Extreme Energy flat hydraulic CL12-234-2, less than .500 inches of lift. I'm using their whole cam kit with springs, lifters, and comp's magnum roller tip rockers.
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RE: small block push rods - 3/2/2008 6:21:05 PM
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78buckshot
Posts: 653
Joined: 1/28/2007
From: Michigan
Status: offline
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Thanks for the chart Clayton, I didn't see any reference to push rods but like you said, they were using different heads.
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RE: small block push rods - 3/2/2008 6:31:27 PM
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DryCreamer
Posts: 93
Joined: 1/28/2008
From: Muncie, IN
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I would venture a strong guess that if the heads weren't milled and you are using the stock block, that stock length push rods will do fine, are they the rockers that have the posi-lock nut in the center or do they have the little doughnut thing (can't remember the name, fulcrum?) and the stock oblong nut? My buddy used Edelbrock heads and full aluminum roller rockers with stock pushrods just fine. I just called him and he said it depends on where the tip of the roller rocker sits on the tip of the valve stem. Put it all together with a couple stock pushrods and see where the tip of the rocker arm sits, if it rests in middle of the valve stem, you are good, if its to far to the exhaust side, you gotta get shorter, if its to far to the intake side, you gotta get longer.
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RE: small block push rods - 3/2/2008 6:43:59 PM
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78buckshot
Posts: 653
Joined: 1/28/2007
From: Michigan
Status: offline
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I'll have to find a solid lifter to check the travel, the hydraulics wont be pumped up and the plunger will give me false readings. The rockers have the ball style fulcrum similar to the stock rockers. I'll definitely start with the 7.80 rod and check the entire path of the rocker tip. I appreciate the info from your buddy.
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