roller tip rockers vs guide plates

[Falco]

Howdy,

I know that we talked about this a few times, but I need a final clarification now, before I start to assemble my L35's.

I'm planning to user these Comp Cams Magnum Roller Tip Rockers:

http://store.summitracing.com/images/prtdtl_images/pd_1lrgimg.gif

The questions.

1. Should I use guide plates with these or not?

2. Are we using 5/16" diameter push rods?

3. If I have two yes at this point, should I buy raised (4800-8 ) or flat (4808-8 ) guide plates?

TIA,

 

[Lynn D. Brown]

Valve Guideplates

Valve Guideplates

Falco,

We have 5/16" PR's. I will be going thru the same thing w
my 412 CC cam (to be ordered) and Crane Gold Rollers.

I understand from Conley that U will need to check the clearance
between the each PR and the guide holes in the head while cranking
the engine. The higher the lift on the cam, the more likely U will contact.

I saw a post awhile ago that said that U don't need guideplates
with "self aligning" rollers. But Conley said that U need to check this.
anyway.I presume that we need hardened PR's, altho' I'm not sure
that there R any other kind.

 

[Falco]

Lynn,

Thanks. Yep these rockers said to be self aligning and I also remember the rule of thumb. Self aligning rockers -> no guide plates. BTW, what makes a rocker self aligning?

As far as pushrods, I'm planning to use Crane's chromemoly pushrods (11628-16). They said to be one of the best around.

I'll use the stock cam for now, so no big lifts on my side. :-?

Later,

 

[hamrhead]

McCoy just built my engine w/ his 512 cam, stock pushrods, and the Crane Gold Rockers - no guideplates needed. He said it will work just fine. Personally I don't know, just passing along info. Hope it helps. What I can tell you is my truck hauls some serious ASS!

 

[dgoodhue]

Thanks. Yep these rockers said to be self aligning and I also remember the rule of thumb. Self aligning rockers -> no guide plates. BTW, what makes a rocker self aligning?

The valve stem side of the rocker has a groove in it to keep the rocker straight or aligned.

 

[Falco]

Thanks. I didn't know this. Gonna locate this groove myself in the evening.

Peace,

 

[Lynn D. Brown]

Roller Rockers

Roller Rockers

Dave, Falco...,

I'm looking @ my Crane Gold Rocker now, and on the valve
stem side, I see a washer on each side of the roller, which
have OD's easily larger than the OD of the roller. I guess
these washers would keep the roller on the valve tip, and
prevent it from slipping around much.

 

[JSM]

Something to think about. Heard from person getting engine built, and builder told him...

Self aligning rockers put extra stress on the valve guides and wear them out quicker. He suggested using non self aligning, with guide plates. Interesting idea, theory. Can't say I disagree.

Just another FYI.

 

[vette40509]

Roller rockers

Roller rockers

I am using Comp Cam # 412 and have upgraded to L 35 heads. I have Comp cams roller rockers and Crane rocker studs. My problem is that there is almost no threads left to start adjusting nuts. I guess I need slightly shorter pushrods to make all this line up, but my question is how much shorter and possible part number, thanks all!

 

[myclone]

Re: Roller rockers

Re: Roller rockers

I am using Comp Cam # 412 and have upgraded to L 35 heads. I have Comp cams roller rockers and Crane rocker studs. My problem is that there is almost no threads left to start adjusting nuts. I guess I need slightly shorter pushrods to make all this line up, but my question is how much shorter and possible part number, thanks all!

That doesnt sound right :-? Are you running guide plates? Which push rods are you using now? Stockers? Stock roller lifters?

Unless the stud bosses in the heads were cut down too short or they were cut for guide plates and you arent using the plates the stock length push rods should be what you need.

 

[vette40509]

Roller rockers

Roller rockers

The L-35 heads I upgrade to did not have guide plates and maybe the originals did but I do not remember. The pushrods were original to the engine with the factory heads. The roller lifters are from comp cams also. The roller rockers are the self aligning type, so maybe I should have had the guide plates or I will have to use slightly shorter push rods. Probably the same amount of $ either way. Anyone got any recommendations??