Sbc pushrod question

[Mark Yacavone]

Originally Posted by Denny Steward

Mark, a 5/16 .120 wall would be the least I would use on a SBC stocker engine.

Thanks
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Sounds like about a.070 oil passage ..Enough for roller rockers? Anybody go less? Possible?

[Dwight Southerland]

Originally Posted by Mark Yacavone

Thanks
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Sounds like about a.070 oil passage ..Enough for roller rockers? Anybody go less? Possible?

You also have to lube the springs. The bearings in the trunnion of the rocker arm will operate on very little. I have run .025 on circle track engines with the right coating on the valve springs.

[Mark Yacavone]

Originally Posted by Dwight Southerland

You also have to lube the springs. The bearings in the trunnion of the rocker arm will operate on very little. I have run .025 on circle track engines with the right coating on the valve springs.

Okay , coatings..Like?
Any experience without the coating?
I would assume you have to cool the springs to a certain degree too.
I also assume there's a fine mist of oil everywhere in there at higher rpm.

[Mike Pearson]

I wouldn't think you would have any problem at all running a good quality 5/16 pushrods with that spring pressure. I ran them on my super stock engines for years with much higher pressure with no failures. Just got some 7/16 for the engine I am puting in my car. It will be interesting to see if there is any difference from the 3/8 that I have been running. I have mostly used comp pushrods in the past.

[Denny Steward]

They will work just fine without coatings I have plenty of racers using them now with zero troubles at all.

[Denny Steward]

Mike what wall are the 7/16 you are putting in your new engine

[Mike Pearson]

Originally Posted by Denny Steward

Mike what wall are the 7/16 you are putting in your new engine

Not sure they came with the engine when I bought it. They are a nice looking tapered tip type. I will get the engine back from Mike Thompson on Friday so I will look to see if they have a part number on them. I would bet they are 080 wall