Best Rallye Motor based on a a SC 3.0 case?

[ARCSinAK]

First off I sure appreciate all of the advice and energy that the contributors offer, daily in this forum. I live on a Island people ask why I have a 911, I do my best to be humble and give a polite answer. Put the fact is I have a long standing desire to build a vintage 80's era 3.0 that is well suited for my windows of opportunity on the fun roads of Kauai. I understand the most important element is the safety of the public. Just wanted the input the best builders in the business. I understand a 3.2 or a stock 3.6 conversion could be more economical but I wanted your thoughts in regard to a potent 3.0 case based motor with miles of torque and the personality suited for driving A-B with intent.

Regards-
JS
Anyone have SCRS motor specs?

[Steve@Rennsport]

For rally use, especially with twisty courses without long straights, Torque is King.

That means there is no "replacement for displacement" and one of the very best combinations is either a 3.4 or 3.5 made on an SC or Carrera bottom end.

Depending on your budget, I'd recommend either 98mm or 100mm P/C's and a Carrera crank. You might need a set of Carrera rods, depending on what P/C's you ultimately use. With the MM 98mm ones, single ignition is perfect, however the 100mm ones require twin-ignition.

Such long stroke torquey engines work well with stock gears and thats a BIG consideration.

We've had a 911SC/RS here, but they are quite different in every respect. Those had a mild 3.0 making 270BHP using a modified tall-butterfly RSR MFI, low compression and single ignition with RSR headers and a race muffler.

[lindy 911]

An affordable 3.0 based on an SC case:

Stock SC crank
Stock SC rods with ARP bolts
10.5 : 1 JE pistons
Stock Mahle cylinders
Stock '78 or '79 heads
GE-60 cams
Weber or PMO 46 carbs
Twin plug with MSD
European headers
Stock 915

Throw away every bit and piece of the car that isn't absolutely necessary; make it light.
I built this motor for about $7500 using this site for parts.

[haycait911]

this engine was fairly cheap to build. pretty much just JE's, cams, and webers. a torque monster.

3.0 dyno day - a pleasant surprise