Is an SI block the same as an d15b2?

 

no, the Si is D16A6.

MPFI rather than Dual Point / Partially Carb.

.1 liter bigger

 

yeah no ****
But are the actuall dimensions the same .
Is the displacement difference in the block or the throw of the crank

 

Crank stroke is different, and be nice when new around here. Keep the smart-assness to yourself till about 100 posts.

 

My Bad man just a little frustrated.
I am new to this whole honda tuning racket
I can do pretty much anytheing else
figure I should add this to my list
So the physical dimensions are the same , the blocks are interchageable?
The throw would only have to be .2-.5 mm difference to change the displacement that much. Right?

 

I don't really know about the measurements of internals and such whats to equal what etc. but I do know the blocks are not interchangeable. A good rule of thumb is 1.5 --> 1.5 and 1.6-->1.6 for crank/block transfering.

 

all D series 88-95 = 2.95" bore. d15 = 3.33" stroke, d16 = 3.54" stroke.