What size main bearings should I get for my 2.7 stroker?

[Lefty_lifestyle44]

Hey guys, I'm getting ready to order everything I need to do my 2.7 stroker, but I'm caught up on the main bearings. The block is from an '89 2.5 motor and the crank is from an '88 SETA. With this in mind, what size main bearings should I go with? I'm trying to order everything in one go from autohausaz, but if this is something I need to get elsewhere then I'll do that. Thanks!

[AWDBOB]

You’ve gotta measure my dude

[Lefty_lifestyle44]

Under normal circumstances I would, but I don’t have the crank yet. It’s being shipped over here. As far as I’m aware, it hasn’t been reground

[ForcedFirebird]

There are also two kinds of m20 main bearings. Early style with two 2mm tangs on the top shell, one 3mm tab on the bottom shell, late style has two 2mm on top and bottom which was carried all the way to m54. If you are using aftermarket shells, they only come in STD and -.25mm, OEM shells have the colors to mix and match for perfect clearances.