4 bolt main?

[64suburban]

I was wondering, did the blazer's from the 70's equiped with 350's come with 4 or 2 bolt mains, I'm shure alot of people here have pulled a few oil pans off and found out, I have a 75 k5 and it's 350 is resting on the back pourch, cann't easily check. does anyone know right quick if it is a 2 or 4?

thanks alot

 

[southernspeed]

Both my '78s had 4 blt mains. My '91 and '90 motors have 2 blt mains!

 

[resurrected_jimmy]

since its out, post the number on the block and somebody here will be able to tell you

 

[JEBSR]

Both. some were two bolt some were 4. just post the numbers on the block like jimmy said and it can be decoded.