Rocker Clarification is up!!!

[Pvt Parts]

Originally Posted by X-TECH MAN

LOL......More times than I can count. When I went to metal parts inspection a LOT of parts for air craft ejection seats and stuff that goes "BOOM" came in from vendors out of spec.

I have a friend who worked in a job shop that made the pivot pins for aircraft wings during the Vietnam War. I can't post here what went on in that shop.

[Jeremy]

We need to be carfull of what we ask for.
I am trying to get ready for next year and I've checked several rocker ratios.

Com Cams 1.5's came out between 1.526 and 1.572 all over 1.5.
Pro Comp's 1.6 came out 1.506, some over and some under the 1.5.
Crane 1.5,s came out 1.427, all under the 1.5.
There was considerable differances from rocker to rocker on all of them.

What they say there ratio's are may not be what they really are.

Jerry Stk.4168

[Jason]

Maybe the old stamped rocker arms aren't so bad after all.

[Alan Roehrich]

Originally Posted by Jeremy

We need to be carfull of what we ask for.
I am trying to get ready for next year and I've checked several rocker ratios.

Com Cams 1.5's came out between 1.526 and 1.572 all over 1.5.
Pro Comp's 1.6 came out 1.506, some over and some under the 1.5.
Crane 1.5,s came out 1.427, all under the 1.5.
There was considerable differances from rocker to rocker on all of them.

What they say there ratio's are may not be what they really are.

Jerry Stk.4168

Just wondering, what was your test procedure?

[Jim Wahl]

SECTION 10A: STOCK CARS, ENGINE:1, ROCKERS ARMS (Page 5) (1/19/2012)
"OEM or a Aftermarket rocker arm permitted. Either adjustable push rods or adjustable OEM rocker arms permitted on any application, but not both. Needle/roller bearing pivots and roller tips are permitted for all applications. Must remain same design as original application (i.e. stud mount must retain stud mount, pedestal type must retain pedestal type and shaft type must retain shaft type. Stud girdles prohibited.) Stamped steel OEM and OEM-type rocker arms may be reinforced."


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[ss wannabee]

All good points by everybody here...With all the trouble...almost makes you want to yearn for the old days...the real STOCK Eliminator...(lift-duration-overlap-spring pressure...and REAL stock rockers!)

[Jeff Teuton]

How about this. Make sure your rockers are the same configuration like the book says. Make sure the ratio stamped on the rocker is the same as the 'blueprint specs', and make sure your cam passes with a solid or blocked lifter. What am I missing here.

[Jim Wahl]

Originally Posted by Jeff Teuton

How about this. Make sure your rockers are the same configuration like the book says. Make sure the ratio stamped on the rocker is the same as the 'blueprint specs', and make sure your cam passes with a solid or blocked lifter. What am I missing here.

You all know Jeff is right. If you want to take advantage of the new rocker rule you will have to do your homework! Jim


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[Jason]

Forget the ratio stamped on the rockers. Those numbers evidently mean nothing. Be sure to measure the lift at the retainer AND at the lifter so you can do the math when you check the ratio of the rocker arms yourself. What should be a simple bolt-on is turning out to be a real cluster that no one ever expected.

Remember...watch what you wish for, it might just come true!!!!!

[Jeff Lee]

I think it's a real cluster for those that still ask to go to the bathroom...