davew wrote:
Rich
Take both the cam and lifters to a tool shop and have them check hardness. Both should be within a couple of points of each other relative to hardness. [low 50's] Also have then verify lobe taper and the radius on the lifter foot. 90% of failures is either because of the lack of lifter rotation and/or enough zinc additive in the oil.
[Rockwell "C" scale]
I had a new, flat tappet cam fail in the 90s due to not being ground on a taper.
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Miata UBJ: ES-2074R('70s maz pickup)
Ford IFS
viewtopic.php?f=5&t=13225&p=134742Simple Spring select
viewtopic.php?f=5&t=11815LxWxHt
360LA 442E: 134.5x46x15
Lotus7:115x39x7.25
Tiger Avon:114x40x13.3-12.6
Champion/Book:114x42x11
Gibbs/Haynes:122x42x14
VoDou:113x44x14
McSorley 442:122x46x14
Collins 241:127x46x12