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Porsche and VW share the same 4 stud engine and trans bolting pattern from the beginning to 997 in Turbo and GT2/3 water cooled cars. Physically fitting the engine and trans into the chassis differs in difficulty depending on the combination but any drysump flat 6 will bolt to any 911 trans.
Everyone has their opinion on MAX power for a 915. I broke the main shaft on my weak 2.7L version 915 with 167whp autocrossing on a hard shift to 2nd. Later ones are stronger but the g50 box that Porsche went to in ‘87 and 108mm CVs is IMO the only good option if you plan on hard launches on good tires with more then 200ft-lb of torque……… but it’s a LOT of work and not cheap to do a g50 swap these days.
930 box is the other option. It’s lighter….. and somewhat easier to fit but only 4 gears and the same Syncro design as a 915 so they still aren’t the best shift quality.
Last edited by Evan Fullerton; 08-25-2022 at 02:48 PM..
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