460 lifter bore angle dimension

[limebluie]

Gentlemen,

I am currently having a problem keeping cams in my 460. This is a newly rebuilt motor that is going through a proper break in but is still wiping out cams (hydraulic). I need to check the angle of the lifter bore and there locations before I move forward. I need help finding this data.

Thanks Tom

[Tom Wells]

Hi limebluie,

What fails? Are the cam lobes being eaten? Does the cam push the water pump into the radiator

Are these flat lifters or roller? New lifters or used?

A little more description would help.

Regards,

Tom

[limebluie]

Tom Wells

This was a Comp Cam 280 Hydraulic flat tappet cam. No it did not Push from its installed location. The cam lobes and bottom of lifter look like they were put on a grinder.

[Tom Wells]

Hi limebluie,

Here's a place to start.

Crane Cams failure tech page

Note the "Click for closeup" places - see if one of them matches the appearance of your dead cam & lifters.

Sorry it isn't more specific. Let us know if it helps any

Regards,

Tom

PS: I've had cam failure too so I know what's involved - mine was a defective Ford crate motor distributor that ate the gear off the cam...

PPS: Also, as to the lifter bore angle, the site says "or the angle of the lifter bore is not 90 degrees to the centerline of the cam" - the inference is that 90 degrees is the correct angle.

[cobrashoch]

Have you used or installed a cam thrust plate? The problem you described may be a cam "walking" problem. I believe this is also ties to (at least in part) to the cam/distrib. wear problem. The best one I have found is at :
www.bluethunderauto.com
I have never had a lifter related problem where I have had to check the bore angles. Performace engines with racing cams, esp. rebuilds that have lots of miles, need this backup plate for the cam.
Tom - Good site at Crane Cams.

cobrashock