Pin and Spring to Retention Plate

[jsawduste]

All my builds have been pin and spring. Not familiar with the plate design.

Can a pin and spring block be simply drilled and tapped for a plate ? Perhaps there is a casting change ?? Don`t know.

Could the backside of a double roller cam gear be relived enough to clear the fasteners ? Perhaps a fastener with a shallow/shorter head. Maybe a plate with a little more thickness and countersunk fasteners ?

Weighing out using the plate and a Jones cam with a single roller chain vs. the pin and spring with a Jones/Smith and double roller.

You guys know where I am headed but again I am not familiar with the design so my questions might not have any merit.

[SilverXJ]

Can a pin and spring block be simply drilled and tapped for a plate ? Perhaps there is a casting change ?? Don`t know.

If the block has ears in the casting, as seen in the pic, yes they can be drilled and tapped. I have seen earlier blocks with the 'ears' that have not been drilled and taped.

Could the backside of a double roller cam gear be relived enough to clear the fasteners ? Perhaps a fastener with a shallow/shorter head. Maybe a plate with a little more thickness and countersunk fasteners ?

The problem of using the earlier timing chain isn't the clearance. The cam snout is completly different between the two. The retaing plate style cam's first journal is ocmpletly flush with the front of the block. Then the plate attaches to the block, which keeps the cam from coming forward. The cam cog then bolts to the cam. The cam cog is responsible for keeping the cam for moving rearward.

The cam cog itself uses a cast in key and a smaller snout cam for the cog to mount to.

Perhaps these pics will help:

[jsawduste]

Got it, thanks Chris