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That was going to be my next comment regarding the narrow-tipped lifters. If oyu install a cam and peer down the lifter bores you willl see that the lobe is not centered in the bore, rather it is off to the side. This is intentional, and causes the lifter to spin as it rides up and down on the cam. This distributes the wear evenly on the lifter face. A narrower tipped lifter wouldn't get as much spin, and thus is more likely to become fixed in the bore, concentrating all the wear in one spot.
Over on that turbobricks thread someone showed a picture of some roller rockers that don't need keyways machined in the block - just a sort of collar that sits on top. For Volvo application I guess you'd need:
- Collars on the proper centers, still in pairs. The center may or may not be the same as more common applications
- Custom holders for the collars - probably in pairs as we don't have a wide open gallery around the lifters like the V8's. You could fasten them through some holes in the block above the lifter gallery.
- Custom pushrods - shorter than stock and much shorter than the SBC solid lifter length
- Custom cam
Combine those with some roller rockers and you would have knocked some serious friction out of the drivetrain. Although the roller ligters probably weigh a bit more.
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I'm JohnMc, and I approved this message.
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