Overlap Triangle

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Would you tube the block or bush the lifter bores if it were yours?
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I’ll answer your question with a question……

Do you want your DLC bushing lifters to have pressure fed oiling to the bushings……. Or not?
 
PRH said:
I’ll answer your question with a question……

Do you want your DLC bushing lifters to have pressure fed oiling to the bushings……. Or not?
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I can honestly say I don't know. What method would be better?
 
Danny Bellmore said:
I can honestly say I don't know. What method would be better?
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If you need oil to the rollers or if you pushrod oil you can drill the bushings before you install them. a .060 hole is plenty big.

If you tube it, you can drill the tube after its installed and finished. I don't do the oil holes until I run the peening tool through the tube and make sure the lifter moves freely on the bore. Then I drill the holes. .060 is plenty bug enough for that too.

On the drivers side, I use a set screw with a .125 hole in it down at the main bearing. That is enough oil to feed the rollers and/or pushrod oiling.

I haven't done it yet but I will probably start tubing both sides. I can't see why not to do it. But if you just tube the passenger side and restrict the drivers side that's good too.
 
Newbomb Turk said:
If you need oil to the rollers or if you pushrod oil you can drill the bushings before you install them. a .060 hole is plenty big.

If you tube it, you can drill the tube after its installed and finished. I don't do the oil holes until I run the peening tool through the tube and make sure the lifter moves freely on the bore. Then I drill the holes. .060 is plenty bug enough for that too.

On the drivers side, I use a set screw with a .125 hole in it down at the main bearing. That is enough oil to feed the rollers and/or pushrod oiling.

I haven't done it yet but I will probably start tubing both sides. I can't see why not to do it. But if you just tube the passenger side and restrict the drivers side that's good too.
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I did tube my last block. After the peening was done, I had to use a sandpaper roll to get the lifters to move freely within the lifter bores.

Now I did not drill any holes in the copper tubing in the lifter bores.
 
Danny Bellmore said:
I did tube my last block. After the peening was done, I had to use a sandpaper roll to get the lifters to move freely within the lifter bores.

Now I did not drill any holes in the copper tubing in the lifter bores.
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If you aren’t pushrod oiling or you don’t need to pressure feed the lifters I don’t drill any holes either.
 
Danny how did you like the comp cam 20-718-9? I’m considering upgrading to that one from my current comp cam, which is 254/268 - 660/660 -108.
My combo is a 408, 12.25 to 1, Trickflow 190 heads fully ported, 727 5400, 4.30 gears.
 
rslscobra said:
Danny how did you like the comp cam 20-718-9? I’m considering upgrading to that one from my current comp cam, which is 254/268 - 660/660 -108.
My combo is a 408, 12.25 to 1, Trickflow 190 heads fully ported, 727 5400, 4.30 gears.
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I liked the cam.
My combo was 408 11.8 vr200 heads 727 456 gears.
Best pass was a 6.69. My converter was way too tight at 4000.
I now have a 904 with a 600 converter ready to go in.
 
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