[Jack Gifford]

Detonation makes for ugliness.

[R 70 Judge]

Ouch!! Hopefully it can be repaired

[b-man]

I see your blower is for sale.

Is this the end of this streamliner engine project or simply a revision ?

Boy that head sure looks terminal.

[Dragncar]

Marcella has been known to repair some messed up heads.
But that one looks pretty bad.
Sorry about your troubles Jack.

[sdbob]

Wow. Sorry Jack. Hope you can repair it.

[steve25]

Very sorry to see this.
Wow, look at the cracks even around the head bolts!
That head was lifting off the block a crazy amount.

That can likely be fixed, but at what cost, it would be monumental if you can’t do it yourself I would think.

How does the crank and the rod bearings look?

The bearings must be badly hammered?

How long has this head been in use?

[johnta1]

WOW!
Sorry to see that damage.
Was this on alcohol?

What's the plan now?

[Scott Stoneburg]

Wow, that's pretty bad Jack. Sorry to see this. I've been following your project for many years now. I see your blower is for sale, you putting this project to bed?

[694.1]

That should buff out!

[misterp266]

Better to have built a one of a kind awesome engine and blown it up than to have run a cookie cutter boring one.

Interesting to see the thickness of the casting. Sorry to see it blown up like that. If I still had spare heads I’d give you one to replace it but you know I sold them. I hope you still have some ideas for another project.

Rob

Maybe you could cut the head in half and built a two cylinder Hemi………..😎

[chiefbigb]

I have seen some worse than that repaired. It's a setback and opportunity for upgrade. The only positive statement I can make.

[slowbird]

Wow sorry to see this

[Red80TA]

Originally Posted by 694.1

That should buff out!

Helpful

[GOAT8U2]

Ouch, that's a big chunk gone.

Care to go into some details you think might've caused that?

Someone said blower, what boost psi, fuel, AFR, timing etc?

Curious what they would charge to repair vs buying a new head that you 100% can guarantee to beat on again and right away.

[quick67bird]

Sorry to see this Jack. You are an innovator and I feel lucky to have been able to follow some of your exploits. I hope you are able to recover from this.

[Formulas]

3D scan cut a new one from billet?

[Jack Gifford]

Originally Posted by Formulas

... 3D scan cut a new one from billet?...

Bingo! Looking at the breakage- how fragile that old casting was- I regret starting the project with it. A billet would be the way to go.
I've decided to build the engine as a 91 c.i. two-cylinder (#1 & #4) and drop down to H/BFL class. That will only require some crude TIG welding to close up the water jacket in #2.

[77 TRASHCAN]

Nitro?

[Formulas]

Not to long ago the story would be who has a blueprint? No one Ok painfully make one up from scratch $$$$$ Have someone convert a man made drawing to a diggie program $$$$$

Now CNC machines are even more capable iam not sure how many axis they are up to and you can wave a wand around a old part to create a build file

At first this kind of tech is expensive and few n far between but has become more mainstream if you watch the TV show Gunfather Restorations they remake stocks for old guns that come in in this fashion

It wont be as cheap as a box of cereal but far fewer hurdles and man hours than the past

[Tom Vaught]

5 axis CNC Machines are becoming common even in small shops. $$$$$$$ though.

4 axis machines have been around even before the 1960s.

Companies have been using special CNC machines in the wood working industry
for custom home "front doors" for 50 years.

TV