Push rods

[supspt454]

What pushrods is anyone running for a 383 with Edelbrock heads and 1.6. I know factory is 7.200. I have a push rod length checker and almost to the point to measure. Just trying to get an idea what y’all using. Thanks.

 

[Schurkey]

As said, stock is about 7.2".

No one can tell you what you need. There's a dozen variables in an engine that affect proper pushrod length. Get an adjustable pushrod as a tool, and find out what length makes the smallest/narrowest pattern on the valve tip.

Doesn't have to be perfectly centered so long as it doesn't go off the edge of the valve tip as it rolls across.

If you have pushrod guideplates, you MUST have hardened pushrods. If the pushrods are not guided by guideplates or oval holes in the iron cylinder head, you MUST have self-guiding rockers...but don't use guided pushrods AND self-guiding rockers.

The ones I just bought are https://www.summitracing.com/parts/SUM-G6406

Summit is currently running a discount code if your order is at least $250.

 

[supspt454]

Hi. Yeah, I have all that stuff. I was just trying to get some ideas of what length others are running with a similar combo. I know they will all be different. I will post what my measurement will be later today. Thanks.

 

[supspt454]

I took a small shoulder nut and placed upside down in the lifter removed the spring and reassembled. Perfectly locked out the lifter to check for PRL.

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[supspt454]

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[supspt454]

Wear pattern with 7.200 push rods and 1.6 ratio rockers.

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[Schurkey]

Not bad. Perfectly centered, not as narrow as I'd prefer (but they're OK.) I'll take narrow over centered. In a perfect world, you'd have both. Keep in mind that in actual use, the pushrod will preload the lifter by ~.050 or thereabouts, making the pushrod effectively a little shorter. This may or may not improve your pattern.

Those are hardened pushrods...right? And the rockers are not self-aligning?

 

[PlayingWithTBI]

I'll take narrow over centered. In a perfect world, you'd have both. Keep in mind that in actual use, the pushrod will preload the lifter by ~.050 or thereabouts, making the pushrod effectively a little shorter. This may or may not improve your pattern.

^^^Yep. Here's mine after running (with Summit Racing aluminum heads, guide plates, chromoly push rods and full roller rockers) for ~8,000 Miles. A little off center but, a pretty nice wear pattern. Kinda out of focus but, you get the idea.

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[supspt454]

Not bad. Perfectly centered, not as narrow as I'd prefer (but they're OK.) I'll take narrow over centered. In a perfect world, you'd have both. Keep in mind that in actual use, the pushrod will preload the lifter by ~.050 or thereabouts, making the pushrod effectively a little shorter. This may or may not improve your pattern.

Those are hardened pushrods...right? And the rockers are not self-aligning?

BTR hardened chrome pushrods, comp cams steel roller tip rockers (non self aligning) guide plates.