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Old 12-06-2005, 04:11 PM
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pushrod length

am i going to need custom length pushrods for my .480/.480 cam in my chevy 355 using stock ratio 1.5 roller rockers?

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Old 12-06-2005, 04:13 PM
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Unless you are changing something that is going to alter your valve train geometry, then no, you shouldn't need a different length of pushrod. Are you only changing the cam? What is the old setup vs the new setup you are going to?
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Old 12-06-2005, 04:17 PM
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from completely stock to new cam, new springs, new roller rockers, stock ratio, stock length valves.

what if i switched to 1.6 or 1.7 rockers?
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Old 12-06-2005, 04:27 PM
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You should not need different lenght push rods. You should consider stepping up to BETTER quality push rod though.
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Old 12-06-2005, 05:34 PM
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You may or may not need different length pushrods, but since you are installing roller rockers, i'd suggest checking them. Its not hard and you can usually get one of the pushrod checking tools online or at your local speed shop. Here is what it looks like, really takes the guesswork out of it.

As you can see on my last engine, the pushrods were WAY too long. i had the block decked .020 and the heads trued, plus different valves. I had to go .100 shorter to get them right on.

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Old 12-06-2005, 06:30 PM
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wow that pic helps alot. thanks.
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Old 12-07-2005, 04:55 AM
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Pushrod length is a major aspect of proper valve train geometry. It's doesn't take long to check it.

http://www.compcams.com/information/Products/Pushrods/
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Old 12-07-2005, 03:42 PM
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While I agree with the guys above, I don't think a different push rod will be needed in this case. The engine is bone stock, changing the cam isn't going to change the geometry. If he changed the heads, valves, etc.. I would definetly check push rod length. I have the tools and I do check them, but I wouldn't send a guy out to buy the tools for a mild cam swap. If you want to do everything like it "should" be done, he needs to buy a valve spring micrometer and check spring height as well, so he can set up the spring correctly.

My point is this a is a very mild modification, he is not changine heads or doing any other machine work. If the stock pushrods are correct now they will still be correct afer the cam swap. He is not even changing rocker ratios. Nothing he is changing should effect the geometry.

Just my opinion.
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