Topic: 31ci syncro help needed

[markiemark]

I Opened My Motor Today To Start Building It Up And When I Pulled My Pan An Seen The Inside It Complete Confused Me. The Cam Is Real Light. And The Weights Have To Arms That Hook To Crank And Slied On A Rail Built Into The Pan An Block. Wat Type Motor Is This. It Is A Briggs But Dont Have Stock Shroud

[George Herrin]

avs motor

[markiemark]

Is The Avs A Junk Motor? I Didnt Like The Looks So I Rebuilt A 28ci We Had There

[George Herrin]

depends on how you look at it... theres no billet rod for it..

[markiemark]

Just Wondering Is The 33ci A Avs Block.

[George Herrin]

yup

[markiemark]

Could I Switch Out Cranks And Use A Normal Cam And Balanced Crank Or. Is There A Easy Way

[markiemark]

Im about to order a arc rod stock length and was wondering will my stock piston in my 28ci motor fit or do i have to purchase the arc 28ci piston? Like to know before  i order cause im looking to find a non avs 31ci block soon and do not want to have to buy both a 28 and 31 ci piston.

[George Herrin]

No you must use a AVS piston with the ARC rod

[markiemark]

ok thanks george. does that mean the 33ci avs piston will work also since stroke is still same as 31ci and 28 ci

[George Herrin]

Yes but where ya gonna stick the 33 piston. No room in a the 28 blocks well there is but you blow the jugs off when done.,..

[CaseRacer969]

When the 28 is bored and sleeved to a 31, there's only about 1/8" left in some areas.  If you need proof on what George says, I have a two piece jug for show and tell.




Jack Jones
Harc Case Racing

[markiemark]

does briggs use the same base block ot make both there 28 ci and 31 ci motors or is there 2 different blocks they start with

[johnboy]

    can a 31 be bored and sleeved to take the 33 piston?   Just wondering if it will or will a 33  upper block half have to be ordered at about $170 ?    Thanks   johnboy

[markiemark]

The 33 Block Uses The Avs System So Unforternly We Cant Just Order A Block And Swap Parts