i spun a rod bearing in my z6 so now i need to build a motor to get it on the road until i can get a new motor. the z6 head is still usable. i've got three possibly four blocks to use. which would be best with the z6 head? a6, b2, b7, and i might be able to get a 92' z1 block from my friend?

 

I would say a6 IMO

 

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you can use any of these combo's

Z6 Z6
Z6 Y8
Z6 A6
Z6 ZC
Z6 D15
Z6 Y7
Y8 Z6
Y8 Y8
Y8 A6
Y8 ZC
Y8 D15
Y8 Y7

 

i know i can use them. are there any gains from a particular block? or should i just use the one with the lowest miles?

 

reliabilty,lowest miles.
idk enough about diffrent d's to tell you witch is going to give you the most power.