They are stock replacement pistons for Suzuki Vitaras. OEM. Compression is closer to 8:1 in a Z6. You have to use a thinner headgasket, or mill the head/block to get it higher.

Also, I found a manufacturer that produces a .5mm OS Vitara. Topline.

And Pete is refering to a Chevy 350 (350 cubic inch V8).

 

From all of the information I have the compression with Vitara's come out to be 9:1 or slightly lower?

 

Is that the original engine that came in the car?

 

http://zealautowerks.com/dseries.html

~8.13:1 in stock form.

 

then stock compression is 9.1, and the vitaras bring it down to about 8.13 like kedawei said

 

Interesting, I didn't know that.

 

Sov, any particular reason you went with the 59300 cam?

 

Simple really, it has proven results over and over again. I've seen simple setups in the low 200 range get 25-30whp gains with just a cam change, and the fact that you can run it on stock drivetrain (I don't think I will be) is a plus too.

 

Pure curiousity, thanks!

 

Today was tranny day here. Rebuilt the tranny and I'm very happy with the results.

New setup.

OBX LSD
Final: 4.25(stock)

1st: 3.25(stock =( )
2nd: 1.762
3rd: 1.25 (stock)
4th: 1.033
5th: .771

Step one, take tranny out of the car.



Check. The LSD clutch is pretty beat, but we dropped in an 11lb flywheel while we were at it. =)

Step Two, pull off the bell housing and expose the cluster**** of confusion.





Here's mid way through fitting the LSD. Had to do some grinding to the case in order to clear everything correctly, had to install the new bearings on the LSD along with the speedo and ring gear.



After 2 hours of fitting the OBX LSD. Was ready to throw it across the room. :P



Finally got the LSD in and shimmed correctly. Also got the mainshaft and countershaft completely assembled in about 30 minutes. Easy as pie. We fitted everything and bolted it all down. Now to put the case on.

Waaaait a minute. That's apparantly easier said than done. We tried putting the bell housing back on for over an hour!!! It would not go back on correctly, couldn't figure out why until we found a piece of plastic laying on the LSD when we pulled off the bell housing for the 2278364894576362x.

We look into the bottom of the bell housing, and there was the oil guide plate. Plastic piece, guides oil down into the mainshaft... yup, it was broken. FUUUUUCK! Well we realized that was why it wouldn't go on, the guideplate didn't fit into the new mainshaft.

So, if you're ever in a pickle with a broken guideplate and don't know what to do, you can always look down at your feet and pull out the metal guideplate from a 99 Automatic Element transmission, grind down to fit and drill a few holes. Like so:





Fits like a glove.

Then, when you want to realize that you could have saved yourself about 2 hours of time trying to fit the case on, breaking a guide plate, and modifying another... you can just pull out the small fitting in the top of the mainshaft and it will fit the first time around. :| :P

Whatever you decide, this is a finished product.





What a difference this makes! 2nd to 3rd shift falls about 1500 rpms and 3rd to 4th falls about 1000 at full throttle. The acceleration is so much smoother and there is no respool, it's just full boost through 4th. =)

May have some burnout vids and a 2 through 4 pull tomorrow so everyone can just listen to the difference. =)