Bill.  I've sent you a PM and an email.

Lorena, Texas (South of Waco)

Hi ted, i would be greatly interested in a pair of the 4" head gaskets, how would i go about that, thank you, best regards, aussie bill.

  AussieBill            YYYY    Forever Y Block     YYYY

 Down Under, Australia

do you have a number from the piston box???????  dont pistons usually have a part number somewhere on the undersie of the piston??????? Id verify those pistons first before you do any machine work.

Compression ratio would be vary depending upon the piston design, installed deck height, and head cc’s.  But here’s a couple of scenarios.  Four inch bore with a 292 crank, zero deck, flat top pistons, and 68cc heads would be 9.88:1 static compression ratio.  Similarly a four inch bore with a 312 crank, zero deck, flat top pistons, and 68cc heads would yield a 10.26:1 CR.

Lorena, Texas (South of Waco)

Displacement for a 292 wih four inch bore would be 331.752, however it you want to get a little more you could use a 312 crankshaft machined to fit the 292 and 312 rods and pistons and get 345.836 CID. Sounds like a lot of money either way.

Jan  Urbanczyk  Major USMC Ret.

                                                                 Bowie Maryland

thanks ted, was thinking to be on the safe side, would probably have to sleeve the block. had an hours worth of conversation with my machine shop friday, and will be taking a block to him shortly. will need a set of head gaskets after the machining proves successful, and idea as to cubic inches this 292 will produce or compression ratio? thanks

There’s been a few four inch bore Y-Blocks built over the years so it is possible.  Most were done by resleeving all the cylinders but there were a select few that got there by simply boring.  Circle track applications are where the 4” bore applications were the most common back in their day.  If anyone is needing composition gaskets for the 4+ inch bore Y’s, I do have them.

Lorena, Texas (South of Waco)

double check, make sure of pin size, could be chevy 327  or old 301 chevy stroker stuff, put in another box, I have alot of oversze 312 pistons, 3.900 or 3.920  jahns pop-up stuff. The biggest I have seen,  check pin size, all sbc are .927 pins

Po ol Davie

Sparta , Tn.

thanks john, head gasket bore size never entered my mind, but is something to consider. dont know if jahns has an answer for that or no, but will inquire.

Was one of the big MEL blocks 4"?  368?

TC

You gotta have the right tools and know how to use 'em.

TC - Austin, Texas