Originally Posted by mike tkach (Post 4486886)

tim,i have been following but not getting involved.is this your block with the cam from bob and on your invoice does it state [8620 core].

Originally Posted by mike tkach (Post 4486886)

tim,i have been following but not getting involved.is this your block with the cam from bob and on your invoice does it state [8620 core].

Originally Posted by MILD THUNDER (Post 4486889)

Looks like the lobes have some tracking issues on the opening side. I think that would mean, either the lifter acceleration rate if too steep , too much spring pressure, or simply, the heat treating of the lobe is no good. Even with solid roller spring specs, to do that to a billet cam, whether 8620, 8660, etc , shouldnt be happening. We arent talking 1000 lbs of open pressures like some engines run.

Im sure theres a reason companies like comp, crane, lunati, howards, arent doing .400 lobe on a 241 degree cam. But from the other cams ive seen come from haxby, mer, another diy guy, and now tims, it looks to me, like theres a serious heat treating process on these custom ground lobes.

But im no cam grinder. It be interesting to send the cam out and checked for hardness. Im gonna forward these photos to Mike Jones, and see what his take is on them. He actually grinds cams, heat treats them, etc in house.

Originally Posted by MILD THUNDER (Post 4486889)

Looks like the lobes have some tracking issues on the opening side. I think that would mean, either the lifter acceleration rate if too steep , too much spring pressure, or simply, the heat treating of the lobe is no good. Even with solid roller spring specs, to do that to a billet cam, whether 8620, 8660, etc , shouldnt be happening. We arent talking 1000 lbs of open pressures like some engines run.

Im sure theres a reason companies like comp, crane, lunati, howards, arent doing .400 lobe on a 241 degree cam. But from the other cams ive seen come from haxby, mer, another diy guy, and now tims, it looks to me, like theres a serious heat treating process on these custom ground lobes.

But im no cam grinder. It be interesting to send the cam out and checked for hardness. Im gonna forward these photos to Mike Jones, and see what his take is on them. He actually grinds cams, heat treats them, etc in house.

Originally Posted by Full Force (Post 4486899)

I'm learning why Bob was very vague in descriptions ...[ATTACH=CONFIG]559922[/ATTACH]

Originally Posted by Black Baja (Post 4486916)

Tim what did you pay for the cams?

Originally Posted by Full Force (Post 4486899)

I'm learning why Bob was very vague in descriptions ...[ATTACH=CONFIG]559922[/ATTACH]

Originally Posted by Full Force (Post 4486899)

I'm learning why Bob was very vague in descriptions ...[ATTACH=CONFIG]559922[/ATTACH]