Thread: head stud diamiter

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Just curious about where you measure your head stud diamiter? is it @ the thread or where it is larger where the stud goes into the head?? I got 3/8 on the thread and am using 3/8 rockers and am just wondering if that is where my rocker problems may be and I should be running 7/16 instead.

You don't mention the make or size of the engine. The head studs (bolts) in a SBC engine are 7/16-14. The rocker are studs come in two different sizes, 3/8 and 7/16. To what engine are you referring to?

Originally Posted by Bobwall1

Just curious about where you measure your head stud diamiter? is it @ the thread or where it is larger where the stud goes into the head?? I got 3/8 on the thread and am using 3/8 rockers and am just wondering if that is where my rocker problems may be and I should be running 7/16 instead.

You're talking about your rocker arm studs, and not the studs in the block for bolting the heads in place, correct? And we're talking screw in rocker arm studs, not press-in, correct? Your 3/8" stud should measure 0.3750" below the threads, and your major diameter will likely fall between 0.3737" and 0.3750". Just to clarify, this is the engine that you told us about here, right?? Steel roller tipped rockers hitting spring retainers

It's just a suggestion, but in my experience you'll get more relevant replies if you continue the discussion on a specific question in one thread instead of starting new threads for every new idea that you have about what might be the problem. The response from Hurst01 immediately above is a perfect example, asking what engine we're discussing here.

Thanks for your input. Yes that is the engine 96 block with 95 swirl port heads. I bought assault racing's steel roller tipped rockers for the heads, and am still having issues. The rockers are the only self aligning rockers they had, but they said self aligning/vortec. I didn't think the vortec heads were different than the other SBC heads angle wise. I thought it was just in the swirl. The exhaust rockers were hitting the retainers, so I changed them back to the stock SA rockers on the exhaust side, but it didn't solve my problem. I am running 1.5's. the heads came with 1.6's I marked the poly locke on the drivers side last time I had the valve cover off, and havent had the time to check them yet.

Why did you change to a 1.5 rocker if 1.6's were OK before? Did you adjust the pushrod length when you changed ratio?

Bolts, & Studs are measured on the threads

I never ran the 1.6's, but that what was origanally on these heads. Pushrod length shouldn't matter. The 1.6 will push the valve open further, or so I'm told. I need to find out if my problem is that my steel roller tipped rockers are evidently for vortec heads.