Why don't my perimeter-bolt heads have notches?
06-15-2005, 10:01 PM
#1
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Why don't my perimeter-bolt heads have notches? Got some Patriot stg. 2 heads, the perimeter-bolt style, since I have a '98 LS1.
Just curious, why don't they have the notches in the deck, like my stock heads did? Does Patriot use different castings, or mill the heads to where the notches are gone, or what? Anybody know?
I guess since they don't have the notches I can use the MLS Gaskets instead of the old '98 style graphite gaskets. But the MLS are thicker, and will reduce my quench and therfore CR, right?
Maybe Gunnar could chime in here and shed some light on this?
Just curious, why don't they have the notches in the deck, like my stock heads did? Does Patriot use different castings, or mill the heads to where the notches are gone, or what? Anybody know?
I guess since they don't have the notches I can use the MLS Gaskets instead of the old '98 style graphite gaskets. But the MLS are thicker, and will reduce my quench and therfore CR, right?
Maybe Gunnar could chime in here and shed some light on this?
06-16-2005, 08:09 AM
#2
TECH Senior Member
I believe that they are milled and therefore have lost the notch. Just measure deck thickness and substract that from you stock ones. That should tell you how much mill.
06-16-2005, 08:33 AM
#3
Originally Posted by T/A rocker
Got some Patriot stg. 2 heads, the perimeter-bolt style, since I have a '98 LS1.
Just curious, why don't they have the notches in the deck, like my stock heads did? Does Patriot use different castings, or mill the heads to where the notches are gone, or what? Anybody know?
I guess since they don't have the notches I can use the MLS Gaskets instead of the old '98 style graphite gaskets. But the MLS are thicker, and will reduce my quench and therfore CR, right?
Maybe Gunnar could chime in here and shed some light on this?
Just curious, why don't they have the notches in the deck, like my stock heads did? Does Patriot use different castings, or mill the heads to where the notches are gone, or what? Anybody know?
I guess since they don't have the notches I can use the MLS Gaskets instead of the old '98 style graphite gaskets. But the MLS are thicker, and will reduce my quench and therfore CR, right?
Maybe Gunnar could chime in here and shed some light on this?
Actually we weld the notch so that any type of gasket may be used. We had several requests for this to be done, so we made it a standard practice on all perimeter bolt heads.
The MLS gaskets are .055" compressed which is thicker than the graphite.
06-16-2005, 08:56 AM
#4
TECH Senior Member
Originally Posted by Gunnar@Patriot
Actually we weld the notch so that any type of gasket may be used. We had several requests for this to be done, so we made it a standard practice on all perimeter bolt heads.
The MLS gaskets are .055" compressed which is thicker than the graphite.
The MLS gaskets are .055" compressed which is thicker than the graphite.
Yeap that makes sense too. Didn't really think of that.
For the record, how deep are these notches???
