[Grady Clay]

Luke,

What is your planned use? Is your 911E a coupe or Targa? Do you anticipate suspension changes?

How high compression are you willing to go? In other words, what octane do you have available?

Are you willing to twin plug it? That can be done where it isn’t obvious. This allows slightly higher CR or lower octane and is great for use with the MFI.

A 2.7RS has MFI so you will need 911S MFI heads, S throttle bodies, S intake stacks, S cams, RS pump, piping, nozzles, etc. An original MFI green fan shroud would be nice to be a “sleeper.” Starting with a 2.7RS engine would be easiest but expensive. Starting with a 2.4S is less expensive and not difficult but still a lot of work. The other alternative is to collect individual pieces or sets of parts. This is time consuming and possibly more expensive.

Whatever you decide, you want to do it absolutely correctly. No half a$$ deal.

If you are willing to deal with the high octane fuel issue, use 92 mm 2.8RSR pistons and cylinders at 10.3 to 11.5:1 compression ratio. Time consuming to build initially but spectacular performance.

Another issue you probably should consider addressing is a front oil cooler. Adding an engine fan with 1.82:1 ratio is easy.

Sounds like a fun project.

Best,
Grady