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Old 05-04-2012, 08:13 AM
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Confused on checking pushrod length

I am building up a SBC350. The block has been decked, heads have been milled, using non standard head gasket, and I will be using full roller rockers. I see that comp cams offer two push rod length checking tools that might help me, but I might have to buy both. The standard pushrod length on this engine is 7.8", correct" Why in the heck would they make their tools adjust to 7.8"? Shouldn't they make a tool that adjusts from 7.3"-8.3" or is this just a scam to get me to buy two tools? In the end I am thinking with the material that has been cut, I should opt for the smaller tool first, then if that isn't correct get the next size up. Thoughts?


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7702-1 Hi-Tech Checking Pushrod 6.800"-7.800" $19.00
7703-1 Hi-Tech Checking Pushrod 7.800"-8.800" $19.00

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Old 05-04-2012, 09:33 AM
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Cut a pushrod in half, remove a section, weld in long nut on one side, jam nut and bolt on the other and make your own adjustable pushrod tool. Make sure when you do this you can adjust it between the desired measurements. When you get the length right measure it yourself or take it to a machine shop and have them measure it for you. Get the one closest to your measurement that is available. Easy $5.00 problem to handle.

However having a motor with minor decking on the block and or heads with a thin head gasket is probably not enough to require different length pushrods. Usually, longer stem valves with aftermarket heads cause a reason valvetrain correction. If you are using hydraulic flat tappet cam, use a solid lifter in place of the hydraulic lifter to check pushrod length, same with a roller. Keep an eye on the backside of the rocker arm as well. You can get a good pattern with the rocker arm sitting on the retainer on the backside, which causes a need for a longer pushrod or rocker arm clearancing.
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