69a Block Oil Gallery Crack. Centre bearing
 

69a block being checked has revealed a crack showing in centre bearing at top side running up to under side of cam bearing area.
Is this able to be recovered by stiching methods or similar ?
Or to source another block?
Appreciate any experience or assistance on this one.
Phil NZ

Re: 69a Block Oil Gallery Crack. Centre bearing
 

Not nice; a highly stressed area of block...find another one

Re: 69a Block Oil Gallery Crack. Centre bearing
 

Brian your comment and advice much appreciated.
Had thought on pinning at ends of crack.
Is this a common area to locate a crack?
Phil NZ

Re: 69a Block Oil Gallery Crack. Centre bearing
 

Phil, I've never seen a crack there, but there's lots I've not seen....
I take it this is the hot engine you recently bought off trademe?
Any cracks through main bearing webs can be considered fatal. sorry!

Re: 69a Block Oil Gallery Crack. Centre bearing
 

Yep thats the one.
So a 59a, 69a or an 8BA will take this rotating assembly then.
The search for these begins.
Phil NZ

Re: 69a Block Oil Gallery Crack. Centre bearing
 

What size bore is that block?
I may be able to help.

Re: 69a Block Oil Gallery Crack. Centre bearing
 

Sorry to hear about this. I agree with Brian comments about it being fatal.

Re: 69a Block Oil Gallery Crack. Centre bearing
 

Brian,
Its a 59a and at present its out to 3 5/16 plus 30.
Idea now is to rebuild up the stroker engine less this faulty block.
Phil NZ

Re: 69a Block Oil Gallery Crack. Centre bearing
 

pm sent....

Re: 69a Block Oil Gallery Crack. Centre bearing
 

Yep . . . sorry to hear about this one, but the kiss of death!

Re: 69a Block Oil Gallery Crack. Centre bearing
 

Another piece of garden art it would seem.
Just now to push on and work through it.
Phil NZ

Re: 69a Block Oil Gallery Crack. Centre bearing
 

Can you post a picture of the crack? Maybe not the end of the world?
Thanks
John

Re: 69a Block Oil Gallery Crack. Centre bearing
 

Frank Casey to the rescue

Re: 69a Block Oil Gallery Crack. Centre bearing
 

Hey Gas. Are you paying shipping both ways.

Re: 69a Block Oil Gallery Crack. Centre bearing
 

I’ve got a few blocks I swear I’m gonna put right in the middle of the lawn and plant flowers in ‘em. I also would like to see some pics and comments on how this would happen. Sorry to hear about this one......Mark

Re: 69a Block Oil Gallery Crack. Centre bearing
 

I've heard reports about cracks in the center main bearing web but I've never actually seen a block with a crack there -- just about everywhere else but not there. Would be nice to see a photo.

Re: 69a Block Oil Gallery Crack. Centre bearing
 

Block is presently with engine machinist. To the naked eye prior to crack testing would be hard pressed to pick it up without the crack detecting process i feel.
Hence need to have block checked both crack wise and pressure tested where it also failed. This has been the good advice passed on from this Forum.
I thank all for input as always.
Phil NZ

Re: 69a Block Oil Gallery Crack. Centre bearing
 

Well due to a very very helpful Barn member in NZ I believe I will have a good replacement block to put all this lot back into.
This original engine, just rebuilt and ready to go was far from it.
ie water leaks, crack in block, the quoted flathead Ross pistons upon inspection are dome top which will fit nice with the new Edelbrock heads so there are a couple of plus items here.
Phil NZ

Re: 69a Block Oil Gallery Crack. Centre bearing
 

Phill, what cc heads are you using, and bore and stroke.
Lawrie

Re: 69a Block Oil Gallery Crack. Centre bearing
 

Edelbrock 74cc heads. Bore 3 5/16 plus 30 thou. Stroke: 4.125"
Cam: 5T is being ground to 8CM grind. Will be running a Holley 4 barrel 390cfm on a Speedway Inlet manifold. Scat gear with dome top Ross Pistons.
Phil NZ

Re: 69a Block Oil Gallery Crack. Centre bearing
 

Hey Phil: I've been curious about that manifold - looks like it is a more modern design for the standard Holley square bore base. This would seem to be a better setup than using an older 4-barrel design from the 50's that is not really setup for our modern carbs. I'd love to see what the manifold plenum area looks like - if you happen to have the manifold, could you take some pictures of the top-plate on the manifold as well as with the plate removed so we can see the plenum area. Would love it if it was a good dual-plane design with the correct port mappings (given the firing order of the flathead). Take care and good luck with your "new" engine!

Your engine should run really well . . . but I'd sure put a bit more CAM into it! LOL I know, you'll have more torque off a stop and more lower-end power, but I can't help myself with putting cams into these engines. Maybe a 1007B???

Re: 69a Block Oil Gallery Crack. Centre bearing
 

https://www.speedwaymotors.com/shop/...-1-12-313-5536.

Its a Speedway Single Plane inlet manifold as for 48 to 53 Flathead.
This manifold does not allow use of mech fuel pump, electric one required.
Presently have manifold set up on bench for fitting up of single wire genr and cooling fan as mounted below genr.
Cam well its for street use and yes more torque off stop and more low end power.
Phil NZ

Re: 69a Block Oil Gallery Crack. Centre bearing
 

Phil , have you worked out the comp ratio,
on the 276 eng I have on the stand with 66cc heads, 8.4 -1, cranking psi is around 165 -170.
Starts OK on 6v
Lawrie

Re: 69a Block Oil Gallery Crack. Centre bearing
 

This set up came with a 12v set up, ie high torque starter motor and the single wire genr etc. So changed car to 12 v.
That cranking psi is similar to a friend of mine who has a similar set up as i have, his is an H & H build.
Phil NZ