M90 FI build - need advice

[mgoswald]

Hi guys,

I am building an M90 variant turbo rig. Thought I would get any advice on my plans. Here's what I've got:

1978 Euro "L" block w/ stock 93.4mm bore
Standard M30 86mm crank shaft
144mm S38 conrods
Customized M30 head w/ 262 cam

My plan is to bore to 94mm
Use custom forged pistons
Target CR is 9:1

Engine builder is Costa Mesa R&D.

Thanks,

Mike

[tschultz]

What engine management?

[marc79euro645]

I hate to say it,but, m90s love to blow head gaskets between cylinders, because there's not enough meat between them. I had an m90 originally. IMHO you would be better with an m30b34 or b35.
good luck

[smhheidari]

Not a good idea to bore it out.

[Nebraska_e28]

I'm local to your area & am curious about a few things.

Will they run before & after flowbench #'s on your head? What are the expected numbers?
What RA are the capable of finishing your block to?