Roller cams
Thread Starter
|
Cross-Country
Joined: Jul 2014
Posts: 79
Likes: 3
Roller cams
If I am rebuilding engine and select a roller cam, could someone explain how this impacts rocker selection/install? ..and roller rocker vs normal rocker? Can stock rocker arm be used or does aftermarket valve train need to be used?
This would be for a mild build/street use on an FE engine
If there is a good thread or online explanation of these options then point me that way.
Thanks!
This would be for a mild build/street use on an FE engine
If there is a good thread or online explanation of these options then point me that way.
Thanks!
FTE Legend
Joined: Jun 2006
Posts: 31,930
Likes: 1,499
From: Ottawa, Ontario
A roller cam has no impact on the rocker arms, it only affects the lifters which have to be roller(not flat tappet) and the pushrods which have to be shorter because roller lifters are taller.
You could decide to use roller rockers as well but that is not manditory.
You could decide to use roller rockers as well but that is not manditory.
Thread Starter
|
Cross-Country
Joined: Jul 2014
Posts: 79
Likes: 3
For a mild /street build, should I go with stud or shaft mounted system?
Cargo Master
Joined: Oct 2020
Posts: 2,699
Likes: 795
The choice of rocker arm mostly depends on how much spring load you're going to need with your choice of camshaft. If it is a hydraulic roller then the stock rocker arms would work fine.
Many years ago I tested stock rocker arms vs roller rocker arms on a circle track small block Chevy. The rules at the track for which the engine was built required stock rocker arms but where it ended up being raced they didn't have that rule. On the dyno in back to back testing I found ZERO performance difference from one to another. Now to be fair the engine had 16 really good stock rocker arms that I had selected for ratio previously. And to keep the ***** from burning up the oiling to the top end couldn't be restricted with the stock rocker arms so in real world use the rollers would have a couple of advantages. This was in an engine that ran continuously from about 6500rpm up to 7200rpm with a solid flat tappet cam using spring loads of 140 seat 340 open.
Many years ago I tested stock rocker arms vs roller rocker arms on a circle track small block Chevy. The rules at the track for which the engine was built required stock rocker arms but where it ended up being raced they didn't have that rule. On the dyno in back to back testing I found ZERO performance difference from one to another. Now to be fair the engine had 16 really good stock rocker arms that I had selected for ratio previously. And to keep the ***** from burning up the oiling to the top end couldn't be restricted with the stock rocker arms so in real world use the rollers would have a couple of advantages. This was in an engine that ran continuously from about 6500rpm up to 7200rpm with a solid flat tappet cam using spring loads of 140 seat 340 open.
Lead Driver
Joined: Mar 2004
Posts: 8,924
Likes: 153
The choice of rocker arm mostly depends on how much spring load you're going to need with your choice of camshaft. If it is a hydraulic roller then the stock rocker arms would work fine.
Many years ago I tested stock rocker arms vs roller rocker arms on a circle track small block Chevy. The rules at the track for which the engine was built required stock rocker arms but where it ended up being raced they didn't have that rule. On the dyno in back to back testing I found ZERO performance difference from one to another. Now to be fair the engine had 16 really good stock rocker arms that I had selected for ratio previously. And to keep the ***** from burning up the oiling to the top end couldn't be restricted with the stock rocker arms so in real world use the rollers would have a couple of advantages. This was in an engine that ran continuously from about 6500rpm up to 7200rpm with a solid flat tappet cam using spring loads of 140 seat 340 open.
Many years ago I tested stock rocker arms vs roller rocker arms on a circle track small block Chevy. The rules at the track for which the engine was built required stock rocker arms but where it ended up being raced they didn't have that rule. On the dyno in back to back testing I found ZERO performance difference from one to another. Now to be fair the engine had 16 really good stock rocker arms that I had selected for ratio previously. And to keep the ***** from burning up the oiling to the top end couldn't be restricted with the stock rocker arms so in real world use the rollers would have a couple of advantages. This was in an engine that ran continuously from about 6500rpm up to 7200rpm with a solid flat tappet cam using spring loads of 140 seat 340 open.
Cargo Master
Joined: Oct 2020
Posts: 2,699
Likes: 795
That engine used the Reed GTL lobes which are very good designs that have no trouble running to 7500rpm with those loads as long as the rest of the valvetrain is reasonably stable and light. I ran a stud girdle on the stock rocker engine and it never broke any parts. Engine won 9 features that season.
Thread
Thread Starter
Forum
Replies
Last Post
BigJake86
Big Block V8 - 385 Series (6.1/370, 7.0/429, 7.5/460)
3
Mar 15, 2003 08:26 AM
FEina52F1
FE & FT Big Block V8 (332, 352, 360, 390, 406, 410, 427, 428)
7
Feb 11, 2002 10:06 AM
