84black944

Ok i have heard about taking a S2 or a 968 block and having your SOHC head drilled out for the water passages so it fits. I would like to know more about this, like what can be used over on the new block from the original car? I am very interested in knowing how much this would cost to do on my 84 because i was thinking about building it up for boost from a supercharger, and i figure might as well build up something bigger.

Dave

The head from a 8v 2.7 will bolt right up to a 3.0 short block, I'm not familiar with a way to make a 2.5 head fit since there's a difference in bore size (The 3.0 has both a longer stroke and a bigger bore than a 2.5), I don't think any 2.5 parts would be useful except maybe the distributer cap. If you want to add boost, you will need pistons with a suitable compression ratio. Another option you might be thinking of is a 2.8 stroker in which the crank from a 3.0 is used in a 2.5 block.

84black944

though the crank will add more stroke right? so do i have to change cams so the valves dont "kiss" the pistons?

eman930

No the piston moves down the bore more with the 3.0 crank I believe, so no need for different cams

84black944

anyone know where i can get a 3.0 crank for a reasonable price?

Dave

Reasonable for a 3.0 crank is anywhere from $1500-3000, they're kinda rare and in demand. The pistons go further in both dirrections, up AND down, up is a problem. IIRC there are other pistons available with the pin relocated higher to keep the head from making contact.

84black944

Thanks for your guys help. One more quick question what is IIRC?

Jakerx

here ya go... http://forums.rennlist.com/rennforu...hlight=acronyms

btw cute lab...i miss my doggie

(edit: ive tried fixing the link twice to no avail...just look in the very first thread in this forum and read that stuff...under peckster's post is the same link that i put, but his actually works...)

84black944

Im trying to find it but there are so many posts by him lol.

CPTdooberhead

You'd want/need to go with Mahle pistons if you did this, which actually as of recently went out of production, so expect to pay a premium for these as well...