Pulling the L20b

[troyt]

I'll be interested to hear how the new engine pulls. I have an L20b in my '68 1600. Is it possible to do this mod with the L20b block and just swap out the pistons, crank, and connecting rods?

Thanks,

You can bore out the 85mm l20b to fit 89mm pistons, and use your l20b crank and rods. Lots of info out there. Starting with a z22 block at 87mm just means less boring to fit 89s.
Big Bore 2.3L
KA24 pistons into a bored Z20/Z22/L20B block. The small 2.8cc dish area of the KA24 pistons helps to preserve compression ratio even with the low piston deck height. Compression ratio with a open chambered U67 head is 9.9:1 or use dished Z24 pistons and peanut chambered head for 8.9:1 compression ratio.
Parts: Z22 crank, KA24 pistons, Z22S/ L20B rods in a +2mm bored Z22 block or +4mm Z20/L20B block.
s/2+r+p= 92/2+145.9+34.0= 225.9 mm
piston deck height: -1.55mm below deck

[troyt]

[youtube][/youtube]

[L20B]

That set up sounds and looks awesome! Interested to see the dyno numbers on that.

I'm currently building the same engine for my 69' Roadster.