Pushrod clearance

[Illahe]

Hello Gentlemen,

Fitting some Harland Sharp rocker arms today and would like to know what everyone runs for side to side clearance. The assemblies have some serious (.045"+) side to side play, and the pushrod tubes of the aluminum heads are getting taxed with .590 lift (SFT). I have a set of shims to correct the issue, yet I don't recall any information that came with the rocker arm set.

 

[Garrett Ellison]

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Instructions specify .008-.012.

 

[BSB67]

chrome-extension://efaidnbmnnnibpcajpcglclefindmkaj/https://cdn.shopify.com/s/files/1/0569/2951/7720/files/7002K_Instructions.pdf?v=1630371422
Instructions specify .008-.012.

I think he is asking about pushrod clearance, not rocker clearance. But it’s not clear.

 

[Illahe]

I think he is asking about pushrod clearance, not rocker clearance. But it’s not clear.

You've answered my question. I'll center the rocker arms in the pushrod tubes. Thanks for the help!

 

[TT5.9mag]

I put masking tape on the pushrod and if it doesn’t rub off when I rotate the engine I send it. But I also run the largest, stiffest pushrods I can fit.

 

[MOPAROFFICIAL]

Hello Gentlemen,

Fitting some Harland Sharp rocker arms today and would like to know what everyone runs for side to side clearance. The assemblies have some serious (.045"+) side to side play, and the pushrod tubes of the aluminum heads are getting taxed with .590 lift (SFT). I have a set of shims to correct the issue, yet I don't recall any information that came with the rocker arm set.

.010-.015.

 

[TT5.9mag]

Sorry I answered a question no one was asking.

 

[Illahe]

I put masking tape on the pushrod and if it doesn’t rub off when I rotate the engine I send it. But I also run the largest, stiffest pushrods I can fit.

Thanks for the tip!

Manton made me a couple of pushrods to check the set up. When the rocker assembly is installed its clear that the side play was an issue with the pushrod clearance. Even when the rockers are centered with the pushrod tubes, at max lift its close...The cam's base circle is about .045" off the core, and I was wondering if that is messing with the geometry as well.

 

[Garrett Ellison]

Mike at B3 can send you directions to make a geometry correction kit. Oftentimes, It's the only way to correct rocker geometry issues when things get too far off kilter from the original design. I would definitely be looking into it well before the .590 lift range, although it's not just a lift issue, as you noted with your borderline reduced base circle cam.
B3 Racing Engines LLC - Mopar Rocker Arm Geometry Tech

 

[MOPARMAGA]

Sorry I answered a question no one was asking.

That's called "MANSPLAINING" lol