SBC Roller Rockers

[gremmen]

Recently I purchased a set of SBC Stainless Steel Roller Rockers from White Performance, they said they fit large springs. I just tryed one and it rests on the retainer and the roller is off the valve stem by .006 or slightly more when on heel. I was wondering if perhaps my Pushrods need to be longer. Right now I have 8.000" Pushrods (+.200 over), I'm thinking I might need 8.100" (+.300" over). Since my valves are +.300 longer, it makes sense to me. A longer pushrod should lift the rocker up some and put it on the stem without touching the retainer.

These are with Pro 1 heads. New 1.550" springs @ 1.950" Height. Old original 1.550" springs were installed at 1.900", so I now have a .050" higher retainer to get above as well. If this sounds right, which I hope it does, I can verify this with a pushrod checker, then buy the 8.100" pushrods.

What ya think ??

[lun40119]

The valves are +.300, I am running a 8.100 pushrod and my valves are +.100 and the springs I was running were installed at 1.850. Sounds kind of funny I guess, but if the rocker is hitting on the inside by the retainer, I would be willing to bet that the pushrod is too short. Watch the thread engagement with the stud. Sounds like everything is getting pretty tall? Hope this helps.

[want-a-be]

ARP makes a longer rocker stud. You'll have to do some research.

Don

[gremmen]

Looks like 8.150" Pushrods will do the trick. Man this new dart block is not letting me use anything from my old motor, surprised my dart heads fit.

[lun40119]

Fill us in on the rest of the build.......Im always curious.

[want-a-be]

Looks like 8.150" Pushrods will do the trick. Man this new dart block is not letting me use anything from my old motor, surprised my dart heads fit.

Yea,..it's kinda odd that Dart would make Dart heads to fit their blocks,...lol

Hope you have fun with your new engine this year.

Don

[gremmen]

Yea,..it's kinda odd that Dart would make Dart heads to fit their blocks,...lol

Hope you have fun with your new engine this year.

Don

It's amazing what you can get to fit with a little grinding and JB Weld for gasket seal. :p

[gremmen]

If all goes right, which I believe it finally will. Motor should produce 790 HP at flywheel. Well according to the Dyno program anyway. We'll see !

[Awesome Bill]

Take a 100 or so off that for real world and you may be close. One other thing, watch were the pattern of the rocker tip rest on the valve and the width of the pattern with a full sweep of the camshaft. Do not rely on the geometry checkers, they are pretty useless in these conditions, I assume this is a 23° head being you are using Chinese knock off Rockers from Whites. They are not the best rocker and we have used them and they pulled right threw the fulcrom and ofcourse spewed their guts out. You should think twice about at least using a roller camshaft with these rockers. A solid or hyd is fine. We have had serveral of these break including intake and exhaust. So its the old get what you pay for. Harland Sharps are the best rocker for these applications or Crane or Comp Gold series. . Be careful

[want-a-be]

Best listen to Bill on the rockers. It's the dime part that can take out the whole engine.

Don

[gremmen]

So will the Harland Sharps Heavy Duty SH1004 & SH1005's work with the new springs from Dart, which were said to be: Dart spring part #22000080 & +.050" locks. Springs are good up to .750" lift, they spec out like this 230@1.950" / 635@1.200" with coil bind at 1.160".

Want to make sure they'll take the spring pressures & I'll need a Split Set, 1.5's & 1.6's

Where is the best place to buy for a good price??

[Trmnatr]

Recently I purchased a set of SBC Stainless Steel Roller Rockers from White Performance, they said they fit large springs. I just tryed one and it rests on the retainer and the roller is off the valve stem by .006 or slightly more when on heel. I was wondering if perhaps my Pushrods need to be longer. Right now I have 8.000" Pushrods (+.200 over), I'm thinking I might need 8.100" (+.300" over). Since my valves are +.300 longer, it makes sense to me. A longer pushrod should lift the rocker up some and put it on the stem without touching the retainer.

These are with Pro 1 heads. New 1.550" springs @ 1.950" Height. Old original 1.550" springs were installed at 1.900", so I now have a .050" higher retainer to get above as well. If this sounds right, which I hope it does, I can verify this with a pushrod checker, then buy the 8.100" pushrods.

What ya think ??

Usually with a 9.020-9.025 block and .150" longer valves to get a perfect wear pattern im 8.0" - 8.100"

Just did one that was 8.050" with .150" longer Ferrea valves with is .200" longer as an estimate compared to manley

[Trmnatr]

So will the Harland Sharps Heavy Duty SH1004 & SH1005's work with the new springs from Dart, which were said to be: Dart spring part #22000080 & +.050" locks. Springs are good up to .750" lift, they spec out like this 230@1.950" / 635@1.200" with coil bind at 1.160".

Want to make sure they'll take the spring pressures & I'll need a Split Set, 1.5's & 1.6's

Where is the best place to buy for a good price??

You can PM me about Crane Cams gold race rockers if you would like,,,,,

I can give you a good price on them

[Awesome Bill]

Anything Summit sells, I can match or beat their price and ship it overnight or ground.

[Awesome Bill]

It is really useless to suggest a push rod length when the cam height, base circle, deck height, valve length, head gasket, maching on heads, etc etc is not known. We always check the length and then pattern it.

Also, we have found valve patterns not in the middle of the valve to be correct in geometry, so the narrowest pattern is always going to make more power and not wear guides. But to look at the pattern being lower on the valve tip, you would think you would have to shorten the push rod? Not so.

[gremmen]

With all those known items, don't you just want the roller to roll in the middle of the valve stem, not valve stem inside to middle or middle to outside. Once you find the pushrod length that gives the best middle pattern, isn't that what you want ?

My brother just e-mailed me and said he tried a Lash Cap and found that a 7.800" pushrod works, as does a 8.100" pushrod is really close. But that is with the Stainless Rockers, If I buy the Harland Sharps, bet things change again. I'll look at it all on Feb 3rd after I get home. I usually don't like Lash Caps, but that's me.

[Awesome Bill]

Actually no. If it happens to be that the real narrow geometry pattern may be a little low or even a little high don't worry about it. There are certain valve train dimensions you have to stay with like not going over .150" longer valves. This causes the 2 angles to make the interset push the rocker off the valve.

We always shoot for the dead center because this allows the most pressure to area distribution to keep down on heat. But we have seen many times more than shorter, the longer push rod with the pattern a little below center of the valve makes the .010-.020" width we always shoot for. Any wider, the rocker from friction will push and pull the valve back and forth in the guide a prematurely help to wear it out. I have seen guides destroyed in 200 street mile from stock lenght push rods being put back in with no checking and just assumption it will get it done.

Lash caps are great but not needed. This always lengthens the push rod and that is not what you want. The shorter the push rod, the more stable it is with loads and rpm. We just use push rods in .025" incremenets and the one that produces the narrowist pattern is our length. We only use lash caps for titanium valves without the hardended tip or we are in a jam and need to make a to long push rod shorter.

But when you keep raising the valve by just putting longer valves in to get installed height issues fixed or just getting something someone has done and got rid of, on the intake valve angle you make the tip of the pushrod get closer to the intersect point and this pushes the rocker off the back of the valve. If this is the case, you can always tell by the rocker arm will not fit over the retainers and will have to be cleaned up a little. This usually happens but should not if the proper valve tip height is correct for the application. Especially with street applications. hope this helps

[gremmen]

Well I'll get it figured out when I get home. We have other Roller Rocker there and my brother said I could use his Harland Sharp split set Rockers from the alcohol motor to try. He wants shaft rockers anyway. Thanks for all the great info, I'll let you know how it comes out.

[want-a-be]

. There are certain valve train dimensions you have to stay with like not going over .150" longer valves. This causes the 2 angles to make the interset push the rocker off the valve.


LOL...that was a phun lesson.

Don

[gremmen]

Yeah I didn't think building a SBC was like Rocket Science, guess I was wrong. Lots to learn !

[want-a-be]

it depends on how much you're trying to stuff in the package.

Don