AFR Head Gasket Size?
Thread Starter
Racer
Joined: Aug 2006
Posts: 355
Likes: 0
From: Sahuarita AZ
AFR Head Gasket Size?
Hi,
I am installing AFR heads milled to 59cc on my 1998 mn6. The cometic gaskets I received are .051. AFR recommends .040. Are the .051 ok? I know there is a compression loss but is much?
thanks
I am installing AFR heads milled to 59cc on my 1998 mn6. The cometic gaskets I received are .051. AFR recommends .040. Are the .051 ok? I know there is a compression loss but is much?
thanks
Race Director
Joined: Dec 2004
Posts: 13,760
Likes: 75
From: Haymarket VA
The .051 gasket will add a little less than 2cc compared to the .040. It's like running heads milled to 61cc. The bigger issue may be the increased squish area depending how much out of the hole your pistons are. Usually the .040 will result in a quish area of about .035 which helps reduce detonation. .035 seems to be optimum.
Last edited by WKMCD; Aug 27, 2007 at 10:58 AM.
Former Vendor
Joined: Mar 2004
Posts: 1,518
Likes: 7
From: Valencia CA
The .051 gasket will add a little less than 2cc compared to the .040. It's like running heads milled to 61cc. The bigger issue may be the increased squish area depending how much out of the hole your pistons are. Usually the .040 will result in a quish area of about .035 which helps reduce detination. .035 seems to be optimum.
Why not just use the right thickness gasket....Its the cheapest 5-7 HP you will be purchasing plus does help with detonation resistance as WKMCD also touched on. I assume you bought our heads to make more power....dont leave any behind.
Good luck and enjoy them....
Regards,
Tony
Team Owner
Joined: Mar 1999
Posts: 22,025
Likes: 192
From: At the beach in little Rhody
The Cometics are very specific on surface roughness and flatness. The heads are likely not an issue since they are machined specifically for this gasket so how does one confirm the block meets the requirements? Curious as there have been a number of people who have had the Cometics leak on them. Is there a level of block preparation required?
