EB338

I know I read about this in another thread but it was a tangent within a somewhat unrelated thread topic if I remember correctly which has left me searching in vain.

Wasn't there a change in the blocks early on that also involved a crank change making some early blocks incompatible with later cranks and aftermarket stroker cranks? What year blocks were these and how can they be identified? What exactly changed?

Is there a way to identify engine blocks by year? Not complete engines but bare blocks, isn't there a casting or ID number of some sort?

mark kibort

I know with a 84 crank with the larger oiling holes vs the early crank with the earlier oiling holes, there is a subtle difference in the area of the thrust bearing area. dremmling the crank and block area just below the thrustbearing, will solve this issue. (or better, all on the block, but there is not that much material that needs to be removed.)

see the pics on the Scot engine build up and saga.
MK

EB338

Thank you Mark

So they didn't change the main bearing dimensions? All that has to be done is some minor clearancing on the block to accept any of the cranks?

Was that the only difference? No oiling or cooling changes to the block itself?

heinrich

hmmm I thought it was a no-go

EB338

thought what was a no go?

mark kibort

they all seemed the same. maybe someone that actual data can confirm. we did use the old style bearings that came on the 82 block, even though the 84 crank would use the single piece front main bearing other mains are the same, and i dont know the exact differences of the thrust bearing, but it all seemed to work fine

mk

heinrich

old cranks and new blocks and also bearings etc. So a GTS crank will take '78 bearings and run fine in a '78 block?? SWEET.