All Blocks the Same????

[TNT25169]

I can't find my PET cd and I was just curious, are the blocks for the 944 N/A the same as the Turbo blocks? If not, what is the difference?

[nynor]

year for year, yes. with the obvious exceptions for increased displacement.

[fast924S]

NO all blocks are NOT the same, If you look at a bare block they have different tolerance bores 0, 1 and 2. If you remove the head you will see the number stamped on the deck along with a stamp on each piston. SO you could get 2 blocks from a 87 944 and the pistons might not fit correctly if you swap them. Thats the only major difference I know of, Other then that same design

[TNT25169]

The only reason I'm asking is that I have 3 N/A motors and a customer looking for a turbo block to build a race motor. If it's the same block I can sell him one of mine.

[nynor]

Originally Posted by fast924S

NO all blocks are NOT the same, If you look at a bare block they have different tolerance bores 0, 1 and 2. If you remove the head you will see the number stamped on the deck along with a stamp on each piston. SO you could get 2 blocks from a 87 944 and the pistons might not fit correctly if you swap them. Thats the only major difference I know of, Other then that same design

that is interesting. what does that mean? my friend's 944 had two's stamped on his block.

[fast924S]

That means he needs tollerance group 2 pistons

[nynor]

Originally Posted by fast924S

That means he needs tollerance group 2 pistons

i gathered that can you be a bit more specific?

[fast924S]

OK,LOL I tried to see if there is anytmore threads on pelican about the groups but everythime I try and search my web browser crashes.

So anyway I dont know the measurements/specs for the groups, I know their is a 0,1,2, 0 being the tightest and 2 being the bigdest. Tol. group 2 will not fit in tol. group 0 or 1. 0 wont fit in 1 or 2 , ring gaps will be incorrect and so will piston clearances. So If the blocks marked 2 you need to find pistons that are also marked 2, unless your doing a aftermarket rebuild then you would give dia. measurments.


Here is a bad pic of my block marked 1


Here is the mark on the piston, again cell pic

[fast924S]

Here is info from shop manual

[TNT25169]

I learned something new today. But as far as bare blocks go, the turbo and N/A blocks are the same and using a N/A block to build a turbo motor with after market pistons and such won't cause any problems?

[nynor]

Originally Posted by TNT25169

I learned something new today. But as far as bare blocks go, the turbo and N/A blocks are the same and using a N/A block to build a turbo motor with after market pistons and such won't cause any problems?

exactly.