Modifying E Cams

[cmcfaul]

Here's the delema.

My cams are warn (not warn out) but have some miles on them. The shop doing my head rebuild suggested having them modified. What's the consenus here.

Do I have them restored to stock E specs.
Or
Have them modified slightly (fatter ramps, slightly more lift)

The car is a 73 911 E. I would love a few more HP but don't want to cause issues with the MFI

Has anyone done this? Was there a noticable increase in top end HP? Was the MFI able to be dialed in to account for the changes in cam profile.

What would you do?

Chris
73 911 E

[kenikh]

I've done it. The mod is a regrind the DC30 (mod-Solex) specs. John Dougherty does it and it is an ideal upgrade...way better than Solex and E cams. A full regrind is about $300 and your cams come out like new.

See http://www.drcamshafts.com

[cmcfaul]

I have been talking to them about this exact grind as well as a slightly less agressive mofification.

Any issues with fuel delivery from the MFI? Are you using an S (space cam) MFI?

Chirs
73 911 E

[kenikh]

I wouldn't call the DC30/Mod-Solex "aggressive"...it is pretty relaxed actually. I run stock springs and carbs on my '65 2 liter w/ Mod-Solex cams and the motor spins to 7K like lightning on small ports and valves, then falls off fast. Torque is very E-like, with more S-like rush on top. I think a little port floor work would liven the top end up a bit.

MFI won't be an issue and an 'S' or 'E' space came would work fine on this cam. You might need to adjust the enrichment screws a bit for ideal AFR, but you won't have any issues.

[cmcfaul]

I spoke to Gus at PFI and he said the E MFI should be fine with this setup.

Chris

73 911 E