Head mod today

TRS · May 19, 2014

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 · May 19, 2014

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 · May 19, 2014

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

4Z · May 19, 2014

12mm squish band width?
Looks good!!!

TRS · May 19, 2014

roni87 said:
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 · May 20, 2014

Whats the part number for the 08/09 heads?

beamslayer · May 29, 2014

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 · May 29, 2014

rydningen said:
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 · May 29, 2014

beamslayer said:
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 · Jun 10, 2014

Torque grooves.

AndrettiDog · Jun 11, 2014

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 · Nov 21, 2014

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

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Head mod today

TRS

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roni87

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diamonddave

Chilly’s Mentor

4Z

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TRS

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rydningen

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beamslayer

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diamonddave

Chilly’s Mentor

TRS

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kanedog

Undefeated mountain clutching champ of the world.

AndrettiDog

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yotaman1290

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