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I'm certainly not building anything for Pro Stock, just piss ant 1000+ HP gen. 1 SBC. My next iteration is running .927" x 2.250" long x .215" wall H13 pins. I just measured crankshaft balance weights yesterday. The pins are 136.4 grams.

Jason G.
 

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I'm certainly not building anything for Pro Stock, just piss ant 1000+ HP gen. 1 SBC. My next iteration is running .927" x 2.250" long x .215" wall H13 pins. I just measured crankshaft balance weights yesterday. The pins are 136.4 grams.

Jason G.
.787" x 1.800" DLC thick wall pin will handle that.
 

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Another dumb thought. Why can’t they invent a roller lifter with a round ball bearing on the bottom that floats, and doesn’t take a link bar?
 

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Another dumb thought. Why can’t they invent a roller lifter with a round ball bearing on the bottom that floats, and doesn’t take a link bar?
Think about how small the contact area between the ball bearing and the lobe would be and how great the forces would be at that contact point

Stan
 

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Think about how small the contact area between the ball bearing and the lobe would be and how great the forces would be at that contact point

Stan
To make those lifters work and not have such a small contact area the face of the cam lobes would have to be concave. But if done there would be no need for link bars and the lifter could free spin like a flat tappet but with the performance of a roller. Now watch someone design it and become an uber-millionaire. Actually a really good idea with best of all worlds
 

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A question for the PRO STOCK guy's how many runs do you get out of a lifter, or a cam before they are done?

Or do you just change them after so many? How many would that be?

Thanks
 

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A question for the PRO STOCK guy's how many runs do you get out of a lifter, or a cam before they are done?

Or do you just change them after so many? How many would that be?

Thanks
V hasnt raced in awhile, so im kinda not really pro stock...lol. but ill give what i know
cams last indefinitely. Its tool steel and harder than a priests pecker with a new altar boy...lol
Lifters, ive not been able to make the clamshell wheel guided big lifter happy due to lack of r&d time. So our 1.095 stuff with a .950 wheel I would rebuild around 40-50 passes
When we were using the .937 stuff, 20-25 passes

We would typically regrind the tool steel cores, as they are expensive as hell, untill the base circle got too small. I could typically get 3-4 regrinds out of a core before i had to scrap it
 

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To make those lifters work and not have such a small contact area the face of the cam lobes would have to be concave. But if done there would be no need for link bars and the lifter could free spin like a flat tappet but with the performance of a roller. Now watch someone design it and become an uber-millionaire. Actually a really good idea with best of all worlds
Yes machining the lobe like a bearing race would distribute the load much better. How more would that add to the cost of the cam? If the lifter rotated that means you could not run offset push rod seats in the lifter.

Stan
 

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I completely forgot about offset pushrods. Thanks Stan. That changes things for sure. Yes it would raise the price to make the cam.
 

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A question for the PRO STOCK guy's how many runs do you get out of a lifter, or a cam before they are done?

Or do you just change them after so many? How many would that be?

Thanks
I think you are getting an amazing amount of runs on your Comp Z bar .875 Hemi lifters. The tight lash definitely is contributing to this. Doubt that you really need a keyway lifter. If you did the North Carolina stuff is the best.
 

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A question for the PRO STOCK guy's how many runs do you get out of a lifter, or a cam before they are done?

Or do you just change them after so many? How many would that be?

Thanks
Most cannot adjust their valves properly anyway. Their parts get hammered and they blame the lifters.
 

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I don’t know if I’m right, but I set my lifters extremely tight. My thinking is that 0.020 feeler gauge ain’t gonna open a spring with 325# on the seat.
Not sure I'm understanding you statement. Are you saying a tighter lash makes it difficult to open a high seat pressure spring?
 

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I'm sure he means won't move the spring @ 325 while setting the lash guys
 
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