XXO/BVGC '38 Chevy Coupe Build

[fordboy628]

What O-ring wire diameter? Block groove width and depth? Receiver groove width and depth?

Wire:  .041

Groove Width in Head:  .0395 (interference fit - very important of it won't stick!)

Groove Depth in Head:  .026

Protrusion:  about .015 proud (wire in the head)

Receiver Groove Width:  .055 to .060 (centered with the head groove)

Receiver Groove Depth:  .012 to .015

All these dimensions seem pretty normal for o-ring set-ups.    I suspect that the .085" (14 gauge? listed as .0863") thick copper conforms/deforms less than a 21 gauge sheet (.0320") or even an 18 gauge sheet (.0485")


Fordboy

[pops29]

Thanks. With those odd-shaped rings/grooves, I assume you did the grooves with a CNC program? With locations referenced to head dowels?

Yes I did -- I did both the dowels and the groves on the same setup

[Jack Gifford]

It appears to me that the .080" gasket thickness defeated the intended function of the O-ring and receiver groove. Using your dimensions I sketched to scale a cross-section view. It looks as if the movement of the gasket into the receiver groove would be insignificant. The other scale-sketch is of the O-ring scheme in my blown alky hemi V8- where the receiver groove and the .024" gasket form a labyrinth-type seal.

[fordboy628]

It appears to me that the .080" gasket thickness defeated the intended function of the O-ring and receiver groove.

x2


Fordboy

[Roseville Carl]

Happy Birthday Buddy.........

[38flattie]

Thanks Carl, and good luck at Eagle field!

We're headed to El Mirage, to run on a 185 MPH minimum in XXO/BFCC

[Elmo Rodge]

When are you heading out, Buddy? Wayno

[38flattie]

Wayno, I fly into Sacramento tomorrow-I left the car, trailer, and truck out there. We'll be on the lake by 9 Friday morning.

[saltwheels262]

good luck to you and all others going to em this weekend.

[tauruck]

Have a blast Buddy.

We're always pulling for you from this side.

Be safe.

[38flattie]

Thanks guys! I'll post up results of our escapades next Monday or so!

[Roseville Carl]

Kool Buddy go gettum........ I will be thinking of you guys while running at Eagle, maybe next time you run down there I can make it!

[kustombrad]

Saw the beast yesterday and I must say, what a cool car! Hearing the weight of the motor cracked me up (freakin' heavy!) and the difference from Ford to Caddy flathead was pretty cool! While I was standing there talking to (I believe Bored and Stroked) about pushing out head gaskets and other weird issues, I asked what size head studs he was running. I know guys who have run fuel in BBC motors and stepped up from the 1/2" studs for more clamping force, so I can't see how this motor can hold anything from moving around with 7/16" studs! The car is awesome and I love the concept, but if there's room I'd stuff 1/2" studs in there at the very LEAST! Just my opinion guys... see you on the salt!

[38flattie]

Saw the beast yesterday and I must say, what a cool car! Hearing the weight of the motor cracked me up (freakin' heavy!) and the difference from Ford to Caddy flathead was pretty cool! While I was standing there talking to (I believe Bored and Stroked) about pushing out head gaskets and other weird issues, I asked what size head studs he was running. I know guys who have run fuel in BBC motors and stepped up from the 1/2" studs for more clamping force, so I can't see how this motor can hold anything from moving around with 7/16" studs! The car is awesome and I love the concept, but if there's room I'd stuff 1/2" studs in there at the very LEAST! Just my opinion guys... see you on the salt!

I think you are probably right, but it is too late for us to change this year-it is on the winter 'to do' list though.

For Bonneville, we'll have deeper head chambers, so we'll run a .035" thick head gasket, instead of the current .085" gasket-hopefully the O-rings will work better with the thinner gaskets.

[38flattie]

We've been busy modifying the exhaust