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I have a 65 aluminum case that has been opened to 90mm and has the MFI pedestal studs added. My thought was to build either a 2.3 or a 2.5 short stroke MFI on the 66mm crank.
With the bores opened to 90mm it would be a 2.5. This would be good start if you wanted something with bigger cams that would rev to 7500-8000rpm. If you don't want to rev that high replace 66mm crank with 70.4 and build a 2.7. 9.5 to 1 compression and mod S cams would be a nice motor.
However, I am missing the P and Cs and the heads.
2.2-2.7 heads are same casting and can be purchased at reasonable price.
I'm not sure how much "operating" room in the engine compartment I would lose with MFI.
MFI doesn't take up much more space than carbs. The engine sheet metal needs to be modified to fit over the MFI drive.
My easier option is to start with a decent running 2.2 T that I have and consider stroking to a 70.4 crank, adding 2.2 S P and Cs, and swapping out the cams for E cams or possibly S cams (or maybe something in the middle).
You would want at least S cams. The higher compression using 2.2S pistons on 70.4 crank on pump gas might be a issue. E-cams might have way to high a dynamic compression and bigger cams would help this. Better option might be to use 86mm P&C which are the largest without machining spigots and make a 9.5 to 1 long stroke 2.5.
I have a 914-6 conversion with a 2.4 MFI engine. It has 2.4S pistons and Ecams. I also built the gearbox with shorter 3rd KA and 4th S gears. I live in Littleton if you wanted to come down and see what MFI in a 914 does to engine access. You could also go for a drive and see if E cams on a 2.4 would meet your needs.
thanks,
john
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