1967formulaS
Well-Known Member
You must have a washer between hold down and rocker. You can use a flat file on hold down to gain clearance.
Thanks man.
You must have a washer between hold down and rocker. You can use a flat file on hold down to gain clearance.
Agree,you need billet rockers with better clearance to valve tips.
And spring retainers.
for what its worth, I run these on my stealth headed 383. I spent last winter blueprinting the rockers and heads.
All is well at 6800 rpm.
You need clearance throughout the lift cycle. I rounded the nose a little. correct valve stem height is critical.I have. 0.022 clearance between rocker arm body and the retainer. Is this not enough?
View attachment 1715088606
You need clearance throughout the lift cycle. I rounded the nose a little. correct valve stem height is critical.
you need to get the geometry as close as possible. no more than 2.5 threads showing on adjuster and pushrod should be aligned
Wait wait wait. Why do those rockers look like they are guided? Meaning why does the rocker stick down below the valve? That isn't correct.
Also, if you need to move the rocker over, just file down the hold down. It ain't hard.
I just don't know why the rockers are guided.
^^^^^^^^^THIS^^^^^^^^^^^^
The best thing you can do is let Mike help you out. You'll be happy you did.
As for the rockers I'd use 1.6 every day of the week and twice on Sunday. Your cam is close to what I run on a 340 and I used 1.6 rockers so I could NET a bit over .600 lift.
If you have the piston to valve clearance and retainer to guide clearance take the lift. Lift is your friend.
Ain't that a kick in the pants? You never seen those afore? Yeah just let them slap around off the valve tip and guide themselves. The ones that showed up here actually contacted the retainer also. At least that doesn't appear to be a problem this time.Wait wait wait. Why do those rockers look like they are guided? Meaning why does the rocker stick down below the valve? That isn't correct.
Also, if you need to move the rocker over, just file down the hold down. It ain't hard.
I just don't know why the rockers are guided.
Sorry, I didn't realize I could only have 15 messages. I guess email is a better option to reach me. Inbox is now empty.Found B3 profile on here, but his inbox is full. Interested in this geometry correction kit he mentioned in his article.
Maybe this kit along with a slightly longer pushrod is what I need.
Ain't that a kick in the pants? You never seen those afore? Yeah just let them slap around off the valve tip and guide themselves. The ones that showed up here actually contacted the retainer also. At least that doesn't appear to be a problem this time.
$1800 here for Harlan sharp or comp cams rockers. I just can't do it. Not at least for another 6 months anyway.
Went through the cycle at the instructed 0.014 valve lash.
This left me 6 threads below the rocker and 7 threads above the rocker (with the adjuster nut off) using a 9.250 pushrod.
The contact patch was surprisingly consistent near the centre of the valve stem. The angle of the pushrod was a bit off at full lift.
The gap between the rocker arm and the valve retainer was at 0.022 - 0.024 throughout its travel.
Thoughts....
View attachment 1715088632
View attachment 1715088633
Ain't that a kick in the pants? You never seen those afore? Yeah just let them slap around off the valve tip and guide themselves. The ones that showed up here actually contacted the retainer also. At least that doesn't appear to be a problem this time.
That isn't a PRW design, it's a Speedmaster aka ProComp design. With enough tip height, they can work, but why do that when it isn't needed. This isn' t the only Mopar specific part that isn't properly designed, though.Yep. Here is a picture of those rocker arms on a beehive spring. This type of setup will destroy an engine almost instantly! I'm not sure what the guy who designed those rocker arms was thinking about when he came up with that design but it was wrong. I told PRW about this design problem at least 10 years ago but evidently they never bothered to fix it.
View attachment 1715088738
Yep. Here is a picture of those rocker arms on a beehive spring. This type of setup will destroy an engine almost instantly! I'm not sure what the guy who designed those rocker arms was thinking about when he came up with that design but it was wrong. I told PRW about this design problem at least 10 years ago but evidently they never bothered to fix it.
View attachment 1715088738
But they are made at the same factory, just a different part of the building, the early production stage. lolMy PRW rockers don't look like that.
Seems the engineer that drew that design hit the hippie lettuce pretty hard.
But they are made at the same factory, just a different part of the building, the early production stage. lol
I wonder, is comp pro mags just down the hall.
these are small block....prw and speedmaster....look alot alike
View attachment 1715088789
View attachment 1715088790
View attachment 1715088791