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  #1  
Old 01-09-2006, 03:36 AM
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toad490 toad490 is offline
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Default Offset Roller Lifters

Hi, Does anybody other than Indy make BB offset solid roller lifters?
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  #2  
Old 01-09-2006, 05:00 AM
DartGT66 DartGT66 is offline
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Competition cams makes them. They are pushrod oiling style lifters, not the regular solid body mopar models. The pushrod cup of the intake rockers are offset. I have only seen one set of them a friend of mine used in his B1 engine; we have had no problems with our regular lifters either with Indy or B1 heads.
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Old 01-09-2006, 07:48 PM
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pishta pishta is offline
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offset roller lifter? Im trying to picture what that would look like...
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Old 01-09-2006, 08:40 PM
sanborn sanborn is offline
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If you look at the top(pushrod end) of a roller lifter---standard, centered roller lifter have the pushrod cup in the exact center of the lifter. An offset roller lifter has the pushrod cup offset to one side. In the case of the Comp lifters, they are offset .160" to one side. Of course, the lifter doesn't rotate due to the tie bars between a pair of lifters. Are they as durable as centered roller lifter? Don't know but we have been using them for years---some sets have thousands of laps on them.

Offset roller lifters are nice when using W2 heads due to the wide intake port. The offset lifter help to reduce the extreme side angle up to the rocker. They are absolutely essential on some engines---such as low deck "R" blocks with W7,8 or 9 heads.

PS, wish I could draw a sketch on this thing. I can draw better than I can type.
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Old 01-10-2006, 03:10 AM
DartGT66 DartGT66 is offline
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In a typical SB mopar, the pushrods are pretty much angled in the beginning, and when you move the upper end sideways, they are angled "everywhere". In a BB the stock configuration is pretty much straight up. I have seen no problem with the angled pushrod in our BB's, but our engines do not wind that high, the limiter is at about 7500. I think those offset lifters houldn't harm a lot either, though.
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Old 01-10-2006, 08:20 AM
sanborn sanborn is offline
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Dart, the pushrod angularity of a small block is a real problem under race conditions. Not only do you lose a lot of lift at the valve, well over 12% on the W2 intake valve, but the side loads on the lifter/rocker arm does "funny" things to the valve train. And, you need a beefier, heavy valve train to overcome it. Then, you have problems at high RPM with valve train stability due to the weight of the valve train.

Anything a racer can do to reduce this instability is good.
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Old 01-10-2006, 08:34 AM
DartGT66 DartGT66 is offline
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Yes, I'm aware of that. I think the lifter angles are teh same as in A poly blocks with a completely different valvetrain arrangement. Some 15 years ago we had a supposedly "Glidden rooted" SB here; the block had the lifter bores relocated and the angles fixed. It used custom cam cores, which at the time were extremely hard toget at least here. The engine displaced 363 cu in if I remeber correctly, and it run great. It's still here somewhere, and just a few years ago it was used in a D/A avenger, and still run under the index.
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Old 01-10-2006, 06:53 PM
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gotcha. didnt know the .160 would make that much difference.
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  #9  
Old 01-11-2006, 12:47 AM
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Quote:
Originally Posted by DartGT66
Competition cams makes them. They are pushrod oiling style lifters, not the regular solid body mopar models. The pushrod cup of the intake rockers are offset. I have only seen one set of them a friend of mine used in his B1 engine; we have had no problems with our regular lifters either with Indy or B1 heads.
I do have a set of Comp Cam centered lifters, you don't think it would be a problem for me to use them? My shift points should be less than 7000 and there's lots of other things for me to spend $350 on.
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Old 01-11-2006, 01:45 AM
sanborn sanborn is offline
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Pishta, if you are building a 9.0", 48 degree "R" block with W7,8 or 9 heads, using the offset roller lifters means the difference between welding up the intake port or not. With the offset lifters, the pushrods will BARELY clear.
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  #11  
Old 01-11-2006, 02:41 AM
DartGT66 DartGT66 is offline
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At least in our engines it has not been. We have had two B- blocks (shorter and therefore more pushrod angle with offset rockers), one with Indy 440-1 heads making peak power at 7300 and one with B1 heads peaking at 7000. No problems. And my 4d's engine is a RB that has seen up to 7800 with 440-1 heads. We have had no signs of anykind of problems.
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Old 01-11-2006, 09:47 AM
sanborn sanborn is offline
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The problems usually start at 7800 RPM and up. Gets very important at 9000RPM.
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Old 01-11-2006, 09:50 AM
sanborn sanborn is offline
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Opps, forgot to add---the pushrods we use are in the 7.30-7.40" range.
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  #14  
Old 01-16-2006, 10:52 PM
rellik eeb rellik eeb is offline
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If you dont have the lifters already, and there in the same price range, its a no brainer. But buying a extra set for the offset ones, well maybe if you have the cash. I can think other places to spend that money. The custom push rods in my RB engine with 440-1's are 9.9 inchs this is over all length. These are Manton stage III Nos rods, and are .130+ thick. No trouble here, engine pulls nice and clean to 7300 and seen 7600+ a few times. Valve train looks great. These are the heavy body Comp liftres (solid flattapet) So I couldnt use them If I wanted. But will be considered when I go to a roller.
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Old 01-31-2006, 04:36 AM
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Default Just a follow up

The guy I bought my Indy heads from sent me his offset lifters. They are Comp Cams #87019-16. The center of the pushrod seat is about .230 from the side, so its quit a bit. I can see them helping at high rpm.
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