Daniel: As Charlie says, compression will vary with displacement. However, the best stock compression "G" heads have about 69cc chambers. Mummert is shooting for 60-64cc, a substantial improvement.

Paul

The compression ratio will vary from engine to engine. I think it said they have 59cc combustion chambers.


Lawrenceville, GA

I read the article about the heads in issue 88, but unless I missed, I did not see anything about the out of the box compression ratio. Anyone know?

Daniel Jessup

Lancaster, California

aka "The Hot Rod Reverend"
check out the 1955 Ford Fairlane build at www.hotrodreverend.com

I got my YBM two days ago, it´s really getting fast to other side of world, but it is only about 7 or 8 hours flight from New York to Finland and couple of hours from Bruce to New York and half hour drive from Helsinki airport to me.


Tero from Nurmijarvi, Finland

56 Country Sedan, 61 F-100, 61 F-600, 55 F-620, 52 Mercury

http://www.dlc.fi/~teros

http://www.y-block.info

http://www.hollowheads.net

http://www.fordnationals.net

The one complant I have with Bruce is the way he mails out the mag, Bill is 90 miles up the road from me and it seems he receives his issue a week or two before mine shows up. Can't wait for it to show up.

Glen Henderson



Freedom is not Free

Letohatchee, AL

Bill:

I read that the heads would have 14 mm plugs, maybe it is intended to use the ones with a 5/8 hex, which would use a smaller socket.  Don't worry, John will have it covered.  Wish I had my mag, it isn't here yet.  Maybe the postmaster is reading it.

John in Selma, IN

John - "The Hoosier Hurricane"

Y-Guys       Just got my new YBM and WOW!!!! They have arrived(Heads)

         They look great but, the clearance around the plugs looks the same.

         Will this be enlarged to give the plug socket more room or is this the

         pre-production set? Can't wait to see flow results and dyno run....

                                                  Bill

Bill

Pelham,Al