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Re: Rocker arm issues. [Re: AndyF] #3039049
05/02/22 11:50 AM
05/02/22 11:50 AM
Joined: Aug 2019
Posts: 6,508
Super Spudsville
Mr PotatoHead Offline
Half Baked
Mr PotatoHead  Offline
Half Baked

Joined: Aug 2019
Posts: 6,508
Super Spudsville
Seen two vids on the new mopar small block trick flo heads, the rockers beating the tops of the retainers and one broke valve.

Wonder what the mis match in parts was here?




Originally Posted by AndyF
My guess is that someone at the PRW factory stamped a set of 1.50 rockers with the 1.60 ID and then they got boxed and sold as 1.60 rockers. PRW gave me a set of their steel rocker arms when they first came out for a magazine article, but the rockers were a timebomb so I never used them. The rockers had ribs around the roller tip that were too big. The ribs hit the valve lock before the roller hit the valve stem so the load was all being carried by the valve lock. I never even started the engine when I saw that. Just boxed up the rocker arms and sent them back and never included them in the article. I assume they fixed this design flaw but I haven't looked at a set since.

Screenshot 2022-05-02 at 09-47-18 Customs Stops Tricked Out Truck Border Security Canada's Front Line.pngScreenshot 2022-05-02 at 09-46-43 Customs Stops Tricked Out Truck Border Security Canada's Front Line.png

STOP POTATO HATE!
Re: Rocker arm issues. [Re: Mr PotatoHead] #3039067
05/02/22 12:34 PM
05/02/22 12:34 PM
Joined: May 2005
Posts: 1,503
Apollo, PA.
B1MAXX Offline
pro stock
B1MAXX  Offline
pro stock

Joined: May 2005
Posts: 1,503
Apollo, PA.
Hey pretty nifty, a built in valve spring compressor. laugh2

Re: Rocker arm issues. [Re: Mr PotatoHead] #3039114
05/02/22 03:06 PM
05/02/22 03:06 PM
Joined: Jan 2003
Posts: 13,916
So. Burlington, Vt.
F
fast68plymouth Offline
I Live Here
fast68plymouth  Offline
I Live Here
F

Joined: Jan 2003
Posts: 13,916
So. Burlington, Vt.
Quote
Seen two vids on the new mopar small block trick flo heads, the rockers beating the tops of the retainers and one broke valve.

Wonder what the mis match in parts was here?


The only rockers I would have any real “expectation” about fitting those heads, without needing modifications to something, are the HS part numbers recommended by TF.

Anything else should get extra scrutiny(although they should all be checked).

If there is evidence of contact between the rocker and the retainer.......IMO, that’s on the one doing the final assembly.


68 Satellite, 383 with stock 906’s, 3550lbs, 11.18@123
Dealer for Comp Cams/Indy Heads
Re: Rocker arm issues. [Re: fast68plymouth] #3039220
05/02/22 10:55 PM
05/02/22 10:55 PM
Joined: Jan 2003
Posts: 29,809
Oregon
A
AndyF Offline
Too Many Posts
AndyF  Offline
Too Many Posts
A

Joined: Jan 2003
Posts: 29,809
Oregon
I agree. In my opinion there are only a few rocker arms that work with each popular Mopar head. Many people assume that you can buy anything and bolt it to anything and have it work since the parts are advertised for a Mopar BB or SB. But I've seen enough data over the last 30 years to convince me otherwise. Everything doesn't fit on everything.

Re: Rocker arm issues. [Re: AndyF] #3039839
05/04/22 11:05 PM
05/04/22 11:05 PM
Joined: Sep 2017
Posts: 258
Red Deer, Alberta
G
Greenwood Offline OP
enthusiast
Greenwood  Offline OP
enthusiast
G

Joined: Sep 2017
Posts: 258
Red Deer, Alberta
Originally Posted by AndyF
I agree. In my opinion there are only a few rocker arms that work with each popular Mopar head. Many people assume that you can buy anything and bolt it to anything and have it work since the parts are advertised for a Mopar BB or SB. But I've seen enough data over the last 30 years to convince me otherwise. Everything doesn't fit on everything.


That's an interesting observation. I've just got a set of worked over J-heads. I have a hunch I will be able to do a real world comparison where I find out exactly what the power difference is between 513 lift and 585-590 lift, with no other changes. smile

Re: Rocker arm issues. [Re: Greenwood] #3040015
05/05/22 04:51 PM
05/05/22 04:51 PM
Joined: Jan 2003
Posts: 13,916
So. Burlington, Vt.
F
fast68plymouth Offline
I Live Here
fast68plymouth  Offline
I Live Here
F

Joined: Jan 2003
Posts: 13,916
So. Burlington, Vt.
If the engine combo is slightly “under-cammed”, then the added ratio(area under the curve) should pay off.
Adding ratio is no guarantee of added power.
I’ve swapped rockers from 1.5 to 1.6 several times where the result was a reduction of power across the board.

We have 1.2 break in rockers for SBC.
Sometimes even when swapping from those to the normal 1.5’s or 1.6’s doesn’t result in huge gains.


68 Satellite, 383 with stock 906’s, 3550lbs, 11.18@123
Dealer for Comp Cams/Indy Heads
Re: Rocker arm issues. [Re: Greenwood] #3040055
05/05/22 07:02 PM
05/05/22 07:02 PM
Joined: Aug 2003
Posts: 39,275
Bend,OR USA
C
Cab_Burge Offline
I Win
Cab_Burge  Offline
I Win
C

Joined: Aug 2003
Posts: 39,275
Bend,OR USA
Originally Posted by Greenwood
[

That's an interesting observation. I've just got a set of worked over J-heads. I have a hunch I will be able to do a real world comparison where I find out exactly what the power difference is between 513 lift and 585-590 lift, with no other changes. smile
Are you sure that the cam with more lift doesn't have more duration at .020, .050, .100 and at .200 lift on the lifters? scope twocents
All the BB Mopar V8 I've dealt with at the track and on a engine dyno like more air with more fuel up Your on the right path wrench up

Last edited by Cab_Burge; 05/05/22 07:03 PM.

Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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