340six
King Of Bling
These are the old Comp Cams before Stainless and not Bushed. 1.5 ratio will be used with the 3/8 pushrods(shown)
And Bannana shafts and adjusters/nuts came from Smith Brothers
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Valvetrain Geometry
- Thread starter Earlie A
- Start date
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And Bannana shafts and adjusters/nuts came from Smith Brothers
Possibly cause they still produced poly's after LA came out, sharing same angle would probably allow both share same machining operations
gzig5
Well-Known Member
Seems like the tip of the PRW is much higher above the centerline of the pivot than the Comp that is pictured below it. Especially if the rocker is rotated so that the adjuster bolt is vertical. That has to have an effect on something? I need to get my set of PRW out anyway to start measuring again for correction. If someone has good Paint skills, I bet it would be more obvious with some reference lines laid on top of the axle axes.
Woody500
Well-Known Member
It was obvious to me when i first looked @ the pics, that one is higher. & there was one that seems to look even higher than that, but may be has a different shot angle on it fooling me.
Earlie A
Well-Known Member
There are certainly differences in the shape of the arm and in the angularity of the adjusting screw. It’s a little harder to tell anything about the differences in the location of the contact points which is what would really matter. Does anyone have an old PRW rocker (1.6 ratio) they would be willing to ship to me for comparison testing? I have block and head combo still set up for this purpose. I’ll pay for the shipping both ways and post the results.
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gzig5
Well-Known Member
I can help with the PRW rocker but you need to clear some space in your inbox or PM me.
Earlie A
Well-Known Member
Thanks. Try again.
It was a comparison to the small block Chevy. I should have been more clear.
That was sorta my question. 48 degrees seems to be the "perfect" angle. Only 3 degrees from 45. 11 degrees from 59. What I was getting at was, I'd rather have 45 than 59. lol Can the stock blocks lifter angle be "corrected" to 48?
Nope. There isn’t nearly enough material the to move them that far.
That's too bad. I wonder what their thinking on that was? Maybe like EarlyA said. Kinda a holdover from the poly junk.
Earlie A
Well-Known Member
Wonder how much it could be corrected with lifter bushings? And how far could you cheat a cam core? 2,3,4 degrees?
Wonder what Bob Glidden was using for cam cores when he welded his own blocks to 48 degrees?
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That's what I was asking essentially. It could only be done with lifter bushings. I think newbomb mightta missed that. Does it or would it really matter about the cam core? Could you "cheat" that much.....or would you be actually correcting something and remove friction from the whole shoot & match? Maybe we should just all run 1st gen Chevy small blocks. lol
Cuda416
Well-Known Member
I just did a quick 2D cad drawing using some of the basic dimensions and it looks like the lifter bores would have to also be "rotated" toward the centerline of the engine around the cam axis, not just tilted so even reboring the lifter bores to correct the angle would take out all of the material on the inboard side of the bores. There'd be no meat to put a bushing into.
That is assuming the lifter bores are aligned with the cam centerline so I could be wrong.
Yeah that sounds about right. We're purdy much "stuck" with what we got. What is it? Ten grand for a block with better geometry?
Cuda416
Well-Known Member
That or a radically designed head/valve train that works with 59. Still probably cost 10k lol
Exactly. We need to all change to slant sixes. There's some good geometry. lol
Cuda416
Well-Known Member
We could weld two together and just go with V12's!
Earlie A
Well-Known Member
This is correct. The lifter bores would have to rotate around the centerline of the cam. There is enough meat to rotate some, just wonder how much.
Cuda416
Well-Known Member
After making a cad drawing like a 2yo using crayons, I'm wondering if anyone has actual 2d drawings of blocks, heads etc they'd share for edumacational purposes. Not asking for the keys to the kingdom so to speak just things that you might have found floating around the internet. I've seen bell housing bolt patterns, hemi heads etc. Anyone here have small block stuff?
Earlie A
Well-Known Member
That would be great. Even factory blueprints that could be digitized.
Woody500
Well-Known Member
I had seriously thought about that. Probably take a lot, and many more stoppers than occurred to me 15 yrs ago.
Need more mains...etc etc etc. Just too much!
And I wondered if they thought about it for the Viper.
Cuda416
Well-Known Member
If the tractor pull crowd can do it, someone around here can figure it out. lol
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