[manbridge 74]

Originally Posted by lvporschepilot

Using the same pistons but shorter stroke crank will ruin not only severely lower static compression but also the squish factor which one typically wants, in these motors, to be around .040 just under the cylinder deck.

If you do use the 70.4mm crank, I can attest to these being outstanding motors. I just completed and am now running my second one of these after the first one turned out so nice. 39mm/38mm ports, Carrillo rods, twin plug (using COPs), 10.5:1 cpr, DC65 cam, upgraded valve train etc. The first one I did with MFI was great so I made one with full sequential EFI and ITB for myself. Just a fantastic flexible engine that revs like the dickens. With these cams I suspect somewhere around 270-280bhp (flywheel) is had with good drivable torque. Lighter the car the better obviously.

DC80/GE80 cams can even be used in these (MFI or EFI and twin plug with higher cpr only, no carbs! not enough vacuum) and one can still get away with it on the street and be ok, they're not like the old Ferrari P6 cam or even RSR cams which are literally an off/on switch. Still, I wouldn't recommend any bigger than Dc60-65 on the street as it's rare one is revving high enough to take advantage.

Was the space cam modified/changed on MFI build?