[forcd ind]

some time ago i had used a hyd roller (cast iron) and a mech fuel pump-i had to replace the cam when the pump lobe went flat-im getting ready to build a BB with a roller and mech pump, and now wondering if it was the same deal with flat tappet lifters and modern oils-lack of zink or whatever
i realize the pump doesnt have as much pressure as a valve spring/lifter on the cam, but wondering if it does create a problem, and should you use an additive like what they use for flat tappet cams
i know on billit cam cores they have the bronze tipped pushrod, and even a roller tipped one
any thoughts on this(and no i dont want an elect pump, lol)

 

[Schurkey]

No actual experience here--but--my first guess is that you had defective or mis-matched parts.

There is much less load on the fuel pump lobe; you shouldn't need a high-pressure additive there.

I bet you had a defective pump (shock load on the lobe) or the fuel pump pushrod was perhaps scarred on the cam lobe end; or made from an incompatible material. Perhaps the camshaft lobe was just too soft--improper heat-treatment?

 

[wildman926]

I use Chevron Delo 400 for that very reason, as I want to keep my Carter 172 mechanical pump. I use the ARP bronze tipped one.

 

[LS7]

Billet cam, bronze tip push-rod here, no special oil or additives, just plain old Castrol 10W30. :boring:

No roller tip fuel pump push-rod for a big block Chevy that I am aware of, is there?

 

[BowtieAaron]

Billet cam, bronze tip push-rod here, no special oil or additives, just plain old Castrol 10W30. :boring:

No roller tip fuel pump push-rod for a big block Chevy that I am aware of, is there?

thats what i have. and its in an 880 96+ vortec truck block, and didnt take any mods to run.
voodoo hyd roller cam too, and holley 130gph mech pump

aaron