Head mod today

[TRS]

I like the 2008 head over the 2010-2014 head. Milled changes to a 2008 head today. Going to try the chordal bowl width and chamber radius we used on our old big block race sleds. Hope to get it tested on the snow shortly. The head on the left is a stock 2008 and the one on the right incorporates the changes.

 

[roni87]

08' heads are 14:1 comp right? Do your changes raise or lower that number? Are you testing on a stock or your turbo sled?

 

[diamonddave]

Nice...Those 08-09 heads are getting harder to find it seems.

 

[4Z]

12mm squish band width?
Looks good!!!

 

[TRS]

08' heads are 14:1 comp right? Do your changes raise or lower that number? Are you testing on a stock or your turbo sled?

It's for the long rod. It's 37.9cc uninstalled. I will need to check squish when it's installed. On the old big blocks we ran 15/1 on Premium with these changes. Will try to install it on a stocker for a test run if I can get the boys to go riding. I ran a stock 08 head, cut .007", on the long rod the last two years.
Can't remember the 08-09 compression ratio.

 

[rydningen]

Whats the part number for the 08/09 heads?

 

[beamslayer]

Hey Tony how did the head work out or are you going to wait till next year ? What are the difference between your head and a PA head ?

 

[diamonddave]

Whats the part number for the 08/09 heads?

The part number supercedes to a 2010 head. No longer available from Polaris

Casting number for the 09 head I have is 5631966

The 08-09 head had a 14-1 Comp ratio.

2010 and up is 12.5-1

 

[TRS]

Hey Tony how did the head work out or are you going to wait till next year ? What are the difference between your head and a PA head ?

Didn't get it on the snow. Hope to get a test this year.
I'm at Dover this week. NASCAR.
They are a different design.

 

[kanedog]

Torque grooves.

 

[AndrettiDog]

I have a 2009 stock head for sale. Was used for about 300 miles before I bought another stock 2009 head and modified it.

 

[yotaman1290]

I got a 08 head if anyone is looking. PM me