CRANE makes good stuff, their gold line of roller rockers has been around a long time, 1.5 is the stock ratio for a chevy small block though the stock stamped rockers can be less than that by a bit due to manufacturing tolerances and such. You can go 1.6 and get more valve lift while retaining the original cam duration without any problems however be advised that this also strains the springs somewhat more and may limit max rpm with the original setup on springs, I have used 1.6 rockers with no problems on mild to moderate cams before as a tuning tool and had no problems,

 

305 Thread

We just had a big discussion on roller rockers and such under the 305 thread. Interesting thoughts.

The 1.5 is stock and so long as you engine is not using a high dome piston, should work just fine. Also the 1.6 will also work for the same conditions.

hr41pearl

 

you may as well save some more money and just get the stamped rockers, roller tips dont do anything. As one other person mentioned in a previous thread, the "roller tip" doesn't even have a bearing in it, so under all the pressure and friction, it doesn't even roll, it just slides over the valve stem like a stamped rocker would. Stamped rockers are not as bad as people make them out to me, and roller rockers aren't needed as often as people preach.

K:thumbup:

 

Don't waste your money with roller tips. They do absolutely nothing. The friction in a rocker is in the fulcrum, not riding on the tip of the valve. Save your money and get a set of real roller rockers.

Chris

 

I agree the only thing a set of roller tips will help is if the stock ones you are replacing are not truly 1.5, other than that the only thing you stand to gain is a lighter pocket.

YOu can get a decent set of full roller rockers for only slightly more money. Check out the Crane and Harland Sharpe.

I would advise you stay away from the Proforms and CATS.

Royce

 

I saw the Cats on Ebay and remembered what you said about them. I was thinking of going full rollers, but I wasn't sure if it was worth the investment. A buddy whose dad races Alcohol dragsters told me to also check the rockers where the pushrods sit for cracks. Mostly I was looking at building a more consistent valve train.

Regards
Mark :thumbup:

 

Well done to all who posted info on rockers.....good stuff! Has anyone ever had probs with the needle bearings failing in roller rockers? My worry is what happens if a needle stops rolling? I guess you can work it out! The Harland Sharpe rollers appear excessively cheap, but have a good reputation as far as I know. Seems too good to be true. Can anyone give real improvement figures when going from a stamped 1.5 rocker to a 1.5 full roller rocker? Are the improvements more visual than actual? Rob

 

.And now i know. Thanks for the link :thumbup: . so from what i have read, it seems that comp cams roller tip rockers seem pretty good.

 

Going to a full roller rocker from a stamped one is to eliminate friction and lower the oil temp.It was one of the first things I did to mine eight years ago for my 305. They have just done a year in my 355 and touch wood are still in good condition.
They are Harlan Sharp 1.6 : 1. Tasty pic of one in my gallery, or here,

 

This time with team mates,:thumbup:
(As you can see the heads are 305 World Products on a 355)

 

Using a roller tip or a full roller will keep the valve more centered in the guide, therefore making the guide live longer and cut some friction in that area.

I run 1.6 plus .001 push rods in my 355. It sounds different and runs better.

Troy

__________________
If you don't make mistakes. your not doing anything.

69 ss rs full custom camaro 98 ISCA grandchampion
69 ss rs bb camaro wifes driver
66 Elcamino 350/all dz parts,ac,windows,loaded,my driver
69 ss chevelle bb conv.fresh frame off
26 T sedan street rod

 

If I ran 1.6 rockers would it lope at idle or would be about the same as it is with the stock ones?

BTW nice work Malc.

Regards
Mark:thumbup:

 

It would not be enough added lift over a stock cam and rockers to cause any lope.

Troy

 

If I went with the 1.6's could I still use the stock push rods? Or would I need to order something else? I kind of like the idea of getting more air in and out of the beast. Any downsides to going 1.6?

Regards
Mark

 

Stock push rods will work fine, if you are not using dome pistons.
It would not hurt any to check the clearance anyway.

No downsides.

And don't forget to buy some pipe cleaners.

Troy

__________________
If you don't make mistakes. your not doing anything.

69 ss rs full custom camaro 98 ISCA grandchampion
69 ss rs bb camaro wifes driver
66 Elcamino 350/all dz parts,ac,windows,loaded,my driver
69 ss chevelle bb conv.fresh frame off
26 T sedan street rod

 

If I go full roller do I need to buy stud girdles too?

Regards
Mark

 

No you don't need stud girdles Mark. Just remember there's self aligning and non self aligning rockers for various head applications. If you're gonna use non self aligning rockers on a late style head, such as a vortec, then you'll need to use push rod guide plates. What heads did you say you're using? While I'm here, check out this site and tell me your opinions on this deal. Sounds suspiciously cheap to me? And are PVS roller rockers any good?
http://www.primediapowerpages.com/c...s7.filereader?408b9e2700f75bb4271dc0a8018906bf+EN/products/100216&2D1007407&2A1

 

I have a set of Summit's full rollers and they are only like $159. The only problem I had is that they needed clearancing for head studs. With bolts you would not have to. Quality looked good other than that......we'll see how they last.

Chris

 

No you don't need stud girdles Mark

Great!

While I'm here, check out this site and tell me your opinions on this deal. Sounds suspiciously cheap to me? And are PVS roller rockers any good?

I'd take a look a Jeg's, Summit or PAW first and compair prices. It's not a brand I've heard of before. Also I was thinking of going with the stainless steel full rollers. Just seems like a more durable material for an area that gets so much work.

Regards
Mark:thumbup:

 

Mark that sounds fine to go with stainless steel. However, I looked at the Summit site and only saw aluminum alloy roller rockers there. The main thing I'd ensure with the alloy rockers is to check that the trunnion shaft outer bearing race has a hardened steel sleeve for durability. Looking at Summit's own rollers you can clearly see the sleeve. Take a look.
http://store.summitracing.com/default.asp?target=department.asp&d=3&x=14&y=8
Also looking at the arms on Jegs's site I noticed that the Proform roller rockers are identical to the much loved Harland Sharp r/rockers, except for the colour of course! He he.

 

This is the haven of amateurs. You cannot always just put in 1.6 rockers to replace your stock 1.52's. You can get coil bind even if you don't cause the valves to contact the pistons if you cam is at a marginal level with respect to total coil compression. So you need to measure. A 1.6 will begin to open at exactly the same time as a 1.52 because the cam contact does not change. However, the lift increases and the volume included in the duration increases which will allow more flow. That will usually allow you to use a larger cam at the same compression ratio because there is more durational compression bleed at overlap. Because it is the overlap and bleedoff that causes part of the loping, yes, it may effect the idle, but if that is what your are looking for, I believe narrowing the center line of the grind will cause more idle effect. Call your cam manufacturer, I don't know what I'm talking about.

 

Daaa, yeh thay sounds right..............

Troy

__________________
If you don't make mistakes. your not doing anything.

69 ss rs full custom camaro 98 ISCA grandchampion
69 ss rs bb camaro wifes driver
66 Elcamino 350/all dz parts,ac,windows,loaded,my driver
69 ss chevelle bb conv.fresh frame off
26 T sedan street rod

 

I don't know what I'm talking about.

Now I'm really confused...

Ok, well theoretically if I increase the ratio to 1.6, will it then mess with the air fuel mix? or will that remain the same?

Regards
Mark:thumbup:

 

I ran my motor on Dyno 2000 with 1.5/1.6 and the difference is next to nothing on a basically stock motor. Going to 1.6 changes lift and duration but not much.As said before the best thing is cooler oil and a more precise ratio over stamped rockers.
The results are here at http://www.hotrodders.com/showthread.php?s=&threadid=36509&highlight=roller+rockers
or do a search "Roller rockers"

 

They will not change fuel air.

Troy