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  1. #1

    Join Date
    Aug 2007
    Long Island NY

    Question rossier engineering 951 head

    I purchased a Rossier Engineering Billet head with 49cc domes for my 951 engine. Where can I get the best info on installation, mainly squash clearance. I tried Rossier's web sight, but there is no where to send them a question. I also need the o rings.

  2. #2

    Join Date
    Jan 2006
    Patterson La
    I'm pretty sure the miller Orings will work for the domes. I'll check, I have both. You need to put it on and check the squish. I think the 49CC domes are for race gas.

  3. #3

    Join Date
    Apr 2005
    Eureka, MO
    Here are the o-ring sizes for the Rossier head:

    o-ring around the top of the dome (spark plug hole):
    AS-568A Part Number: 568-120
    McMaster-Carr Part Number: 9464K84 (package of 50) $11.41
    Nominal Size: 1.000” i.d. x 3/32” cross-section
    Actual Size: .987” i.d. x .103” cross-section

    o-ring on the bottom of the dome (between the dome & the cylinder):
    AS-568A Part Number: 568-044
    McMaster-Carr Part Number: 9464K441 (package of 10) $7.88
    Nominal Size: 3.750” i.d. x 1/16” cross section
    Actual Size: 3.739”” i.d. x .070” cross-section

    o-ring (cord stock) between the billet head and the cylinder:
    Cut to length and use a dab of silicone to seal the joint
    McMaster-Carr Part Number: 96515K41($1.14 per foot)
    Nominal Size:1/16” cross-section x approx. 33.00” long (not sure of actual length)
    Actual Size: .070” cross-section

    As far as squish clearance it depends on the rest of your set-up and what kind of gas you run. Probably around .070" to .075" with 93 octane gas and lower with race gas. I ran the Rossier head in a race gas set up with .055" squish.

    Dan (drb)

  4. #4

    Join Date
    Aug 2007
    Long Island NY

    951 Rossier Head

    Thanks Dan. Part numbers are very helpful. Still have questions, but it looks like this project will have to go until winter.

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