Cam for 440 street build

[TrackPack]

First thing is lose the pistons and build a quench motor, I did and its a beast. 915 heads ported/polished, light weight JE/SRP pistons, Mopar .528 Mech Cam, 6 pack setup, perfect .040 quench with .020. steel shim gasket. 520 HP on pump gas with dyno headers.

I'm guessing that's a bit over 10.5:1 with the 915's. Does that cam duration/overlap bleed off a bunch of compression?

 

[68-500]

That would work, but I think the block deck and heads would have to be surfaced for the mls gasket.

Here’s what I wonder about; if a uncoated steel shim gasket can seal deck to cylinder head with factory machined surface. Why can’t a coated with some fancy sealer mls gasket can’t do the same?

 

[1968rt]

I'm guessing that's a bit over 10.5:1 with the 915's. Does that cam duration/overlap bleed off a bunch of compression?

I calculated compression at 10.2, the chambers were cleaned up a bit and came in at 81cc. With normal lash .028 and .032 the cam doesnt bleed off much. Im running the lash tight at .018 and .022 which helps a bit

 

[TrackPack]

Here’s what I wonder about; if a uncoated steel shim gasket can seal deck to cylinder head with factory machined surface. Why can’t a coated with some fancy sealer mls gasket can’t do the same?

Good question. I know that Cometic wants a specific smooth finish for some reason. We used to use copper coat or sometimes silver paint on the steel shim type.

 

[TrackPack]

Is Racer Brown still open for business? I'm thinking of contacting them for some advice.

 

[RemCharger]

Good question. I know that Cometic wants a specific smooth finish for some reason. We used to use copper coat or sometimes silver paint on the steel shim type.

Exactly, the steel shims were supposed to be used with a sealant. When we were doing the neon headgaskets, the TSB also called for the Mopar gasket spray on the new MLS gaskets.

 

[lewtot184]

I believe the correct way to use a camshaft to bleed cylinder pressure is to use a solid lifter lobe profile with an asymetrical lobe. The LSA is a factor also. Just adding duration by itself may not be the answer.