[Early_S_Man]

Dan,

I vote for doing a rebuild yourself ... with a significant power increase by boring out your cylinders to 85 mm and getting JE forged pistons with 9.5:1 compression and valve-relief pockets, an then installing early-S or GE-60 cams. Webers would be preferable, but 32 mm venturis and the appropriate jets can sometimes be found for Zeniths, too.

The late '60s factory 'rally' engines used 'S' cams and pistons with stock 'T' heads and ports for a significant bottom-end torque increase, and they only lost 10 hp off the top end. The above 'package' should be good for 160 hp and a much more 'fun to use' engine ... your valve sizes are already the same sizes as used thru the 2.7 engine, including the RS 2.7!

Get Bruce Anderson's Porsche 911 Performance Handbook ... and look up the 901/30 engine! Add 10-12 hp for the 256 cc displacement increase ... and you find yourself at 2.4 'E' power level! Talk to EBS about boring your cylinders and the JE pistons , and throw your head work into the discussion for a final price. I think you can do this rebuild and enhanced engine for less than an exchange rebuilt engine!