Maximum bore size for alloy M52 block?

[alexbaby88]

Whats the max I can bore out my M52 alloy block (stock 84mm)?

Are there any significant differences between the M52 and US S52 blocks?

[lifeiskaos]

84.5

[alexbaby88]

I already have a stroked 3.0L on an M52 block and was looking into the feasibility of bringing up the capacity to 3.2L via a bigger bore.

Any significant differences between M52 and S52 blocks?

[lennon]

You can't bore those alloy blocks much at all without going right through the sleeve and into the water jacket. You would need some not-worth-it custom work to get an 86/87mm bore in an alloy m52.

I assume you mean differences between iron m52 and s52 blocks? If so, then there are no significant differences.

What's your setup now? I'm curious.

[alexbaby88]

You can't bore those alloy blocks much at all without going right through the sleeve and into the water jacket. You would need some not-worth-it custom work to get an 86/87mm bore in an alloy m52.

I assume you mean differences between iron m52 and s52 blocks? If so, then there are no significant differences.

What's your setup now? I'm curious.

OK thanks for that info.

I originally had a stock M50 B25 but have now stroked it to a 3.0L on an alloy block M52 using M54 rotating parts (same crank as S52) with 84x89.6 bore/stroke using OBD 1 413 ECU with TMS S50 chip.

[e30polak]

OK thanks for that info.

I originally had a stock M50 B25 but have now stroked it to a 3.0L on an alloy block M52 using M54 rotating parts (same crank as S52) with 84x89.6 bore/stroke using OBD 1 413 ECU with TMS S50 chip.

Have you dyno'd it? I'm interested to see how it performs with the lower compression ratio NA.

[alexbaby88]

No I haven't dyno'd it yet. The M54 has the same 10.5 CR (IIRC) as the S50. As I also have the S50 cams I reckon it should make similar power to the S50 at about 240 bhp at the crank. I'd be pretty disappointed if it didn't come close LOL!