Lifter Bore Grooving Tool ???

[Indycars]

Is the lifter boring tool a good idea for all kinds of lifters, including both type of roller lifters ??? Seems it's main advantage would be with the flat face lifter.

Since the Dart SHP block has "Main Priority Oiling", are the lifters and camshaft at more of disadvantage than in an OEM style oiling where the oil goes to the lifters first ???

It would be expensive for a one time use at $141.
http://www.summitracing.com/parts/CCA-5003/

occasionally I get someone who points out that the roller lifter wheels are not exactly centered on the roller cam lobes , that a function of the original block design being for flat tappet lifters, with flat tappet lifter the lifter bores are purposely not supposed to be in the center. The lifter bores are off center from the lobes and always have been. This was to promote rotation of the lifters, the lobes are slightly tapered and the lifters ran off center. GM did not change the lifter bore spacing when they went to roller lifters

COMP SELLS A TOOL TO GROOVE LIFTER BORES

 

[grumpyvette]

the tools use is more a tweak or refinement than mandatory, but increasing cool lubricant flow to the lifter contact area can,t hurt a bit! ON a roller lifter valve train I don,t see it as all that useful but on a flat tappet ,solid lifter valve train,its sure an option that might improve durability.
I bought mine simply because I liked the idea, and its proved to be useful.
I usually groove my blocks lifter bores lower 1/3rd regardless of the lifter type used, but Id point out that the grooves are shallow and designed to flow extra cooling lubricant, so you'll want to also use a windage tray to control the extra coolant flow volume.
I don,t think they are as big a benefit to roller cam applications, as the flat tappet lifter applications but obviously your more or less stuck with the grooves in the lifter bores even if you change lifter types after the lifter bores grooved unless you sleeve them.btw, Ive built SBC engine with standard oil pumps, and big block oil pumps, in the past, and while I have experience doing it both ways and setting engines up with clearances both on the tighter side of the range with the standard oil pumps and a bit looser with the 5 bolt big block pumps, theres a system that needs to be used , not just an oil pump you stick in an engine, generally if you opt to install the larger big block 5 bolt oil pump theres a reason, and you do mods that require the extra oil flow rates.

READ THIS THREAD
http://garage.grumpysperformance.co...lifter-to-increase-oil-flow.11152/#post-49968

http://forum.grumpysperformance.com/viewtopic.php?f=54&t=2187

watch this video
http://www.youtube.com/watch?feature=pl ... dEFGJqpCMY