2.7 camshaft selection

targaman · 02-10-2018, 08:45 AM

I recently increased my 1973 2.4l to 2.7l with non-rs pistons etc. I have a set of early Solex 109-110 cams which have too much overlap to run with C.I.S. Any suggestions on cam selection for this combo. Also, I have a set of 16x6 Fuchs for the front of my 911 & 16x7 for the rear. What's the biggest tire I can run on the rear without any clearance problems. Any input is appreciated. Thanks, Craig.

Flat6pac · 02-10-2018, 01:36 PM

As long as you are using standard CIS pistons, your choice is CIS 2.7 cams. Not having done it, installing 3.0/3.2 cams should work too but you ll need cam carriers to go with the later cams.
Bruce

911 SLANT · 911 SLANT's Garage

I Once had a 2.7 with CIS stock pistons with a 964 grind. Seem to pull hard. I ran it with carbs and port and polished heads.

Trackrash · Trackrash's Garage

I don't know why you couldn't get your cams reground to something equivalent to what the SCs and Carreras had.

In the rear I know that some have shoehorned 225s on the rear. Those might rub, depending on your alignment settings, ride height, actual tire size, and bead rolling however.

E Sully · E Sully's Garage

You can consider the 2.7 CIS 'S' camshafts. I picked up a set to use in my 2.4 CIS rebuild.

JmuRiz · JmuRiz's Garage

I bought a set of SC-grind cams (3 lobe)for 2.7 CIS pistons for my rebuild, but had to get new pistons when my build went from a cam-swap to a full on rebuild.

PM me if interested, they are good cams, just couldn't use them anymore.
Or if you'd like a 2nd set to send out for regrind, I have a set of stock '77 2.7 cams too.