Lifter rule in Stock

[Rick Schilling]

I know this should be obvious, but if your combination already uses hydraulic roller lifters you can convert to solid rollers now?

[Billy Nees]

Originally Posted by Rick Schilling

I know this should be obvious, but if your combination already uses hydraulic roller lifters you can convert to solid rollers now?

It seems to me that going from a heavy hydraulic roller to a (fairly) light race-type solid roller should do wonders for the RPM potential of a bunch of modern Stockers!

[Greg Reimer 7376]

Seems to me that after a lot of good intelligent questions have surfaced and been discussed, a rule clarification will probably be forthcoming. Yes, Billy, the solid roller lifter comment is a real good probability that RPM's might possibly be affected for good. I know that a mechanical lifter camshaft has clearance ramps included on each end of the lobe configuration to allow for lash, and that the overall lift also compensates for valve train lash. If you tried a set of mechanical lifters on your existent hydraulic cam, what would you use for lash on an initial effort before replacing the cam?We're talking going to a test and tune,not some kind of national event.

[jimi]

Originally Posted by Greg Reimer 7376

Seems to me that after a lot of good intelligent questions have surfaced and been discussed, a rule clarification will probably be forthcoming. Yes, Billy, the solid roller lifter comment is a real good probability that RPM's might possibly be affected for good. I know that a mechanical lifter camshaft has clearance ramps included on each end of the lobe configuration to allow for lash, and that the overall lift also compensates for valve train lash. If you tried a set of mechanical lifters on your existent hydraulic cam, what would you use for lash on an initial effort before replacing the cam?We're talking going to a test and tune,not some kind of national event.

been using solid lifters on hydraulic cam grinds for years in street cars adjust the lash at.006".

[Dan Fahey]

Holy Super Stock Batman !!!

Stockers with SOLIDS !

D

[ALMACK]

Originally Posted by Dan Fahey

Holy Super Stock Batman !!!

Stockers with SOLIDS !

D

One step closer to SS for sure Dan

[Alan Roehrich]

Originally Posted by Rick Schilling

I know this should be obvious, but if your combination already uses hydraulic roller lifters you can convert to solid rollers now?

If that is the case, then a lot of stockers are about to gain a lot of RPM, and spend a lot of money. This could get really interesting. Or really stupid. Maybe both.

[Dwight Southerland]

Originally Posted by Alan Roehrich

If that is the case, then a lot of stockers are about to gain a lot of RPM, and spend a lot of money. This could get really interesting. Or really stupid. Maybe both.

Alan, that usually goes hand in hand. It's like the chicken and egg thing.

[Bob Mulry]

Originally Posted by Bob Don

I just emailed NHRA Tech to get clarification on the new language. This is the response:

"The intent was/is to allow the use of a solid lifter in place of a hydraulic, you may not replace a flat tappet with a roller.

Thanks

Joey Gorman
NHRA Assistant Regional Technical Director
Office-(317)-969-8609"

...and there you have it.

Thank you getting the correct information and posting the email...

Now I can print it off and put it in the racecar glove box with all of the other NHRA explanations....

Bob

[Grey Ghost]

Originally Posted by Bob Don

I just emailed NHRA Tech to get clarification on the new language. This is the response:

"The intent was/is to allow the use of a solid lifter in place of a hydraulic, you may not replace a flat tappet with a roller.

Thanks

Joey Gorman
NHRA Assistant Regional Technical Director
Office-(317)-969-8609"

...and there you have it.

Here we go. Why do the hyd cam combos get an "up grade" and not the solid cam combinations?? IF ( I am not advocating for this) everyone had been up graded to rollers would that not have leveled the playing field? Am I missing something here? Are not the lifter concerns "wiping out a motor" shared with solid and hyd cams?