Inliners International Forums General Discussion Hi Performance Having a custom head made from v8 heads for chevy?

The "Hemi"6 head isn't actually a hemi, it was just called that for marketing purposes.

As for the flat tappet style cam blanks, there is only material cast on the lobes to accommodate grinds in the conventional valve layout, when you change the valve layout, an intake lobe becomes an exhaust lobe and vice versa based on the original OEM valve layout, so you will end up with lobes that have material in the wrong orientation or not enough material to make the lobe. A billet roller cam has a full round lobe and you won't have that problem.

There are at least 3 better cylinder head solutions than even considering a hybrid head, and all 3 will likely outperform a hybrid head and be much less expensive and won't require any custom parts.

50 years ago, there may have been a reason to create a hybrid head for some engines(like the Ford 240/300 6 cylinder with 351C hybrid heads) because the OEM heads may have not been able to exceed the capability of higher performance heads from other engines. That's why you don't see it done today, in the case of these Chevy 6's, there are better options that make a hybrid head unnecessary, even for the most extreme HP levels.

Been thinking about this, I'm think of cutting the heads long and have the machine shop machine allinement pins in a few places and make up a gasket, it's possible I can get away without welding the heads together idk, still brainstorming ideas since it looks I'll be doing it myself.

Since you don't have to get into the water jackets that might work but I don't think the block is stiff enough to handle it. 292s are long, tall, and thin.

Original Hot Rod Magazine article (circa '69) is online here in PDF form Suggests two ways to approach the surgery 4+2 or 3+3 . . .

Don't know how one would mill the final product without the two ends joined firmly. I would also be concerned with torque applied perpendicular to the alignment pins (cracking).

Thanks, lots of useful ideas in that.

I am probably not getting it; but if you want 600 hp from inline 6 gasoline engine, why not start with a GM Atlas 4.2? Stock, it is already half way there, and will rev to 6300 rpm safely.

1. bell housing
2. oil pan
3. height

That along with the fact the average Inliner is of the age where they aren't computer literate enough to take on something this challenging, and swaps like this are too far outside their comfort zone.

Thank you.

I see the bell housing and oil pan as much simpler than reconstructing a head. The height would be partially solved with the oil pan and re-plumbing the intake duct.

thank you

Has anyone else built a 4200 with 1000+ hp like Leo has that Glen Self built? I'm not sure where that crowd hangs out or if there is one.

The guy that owned that engine before Leo bought it had it in the infamous Chevy II wagon that ran low 9 sec 1/4 mile times. Self did a basic freshen up on it for Leo, so that guy was already at that level. But most guys that are don't hang out on forums from what i've seen.

I counted up all the forums i'm on, its 14 as of now. If I had back half of that time i've spent on them, i'd probably be doing stuff like them also. LOL

We were talking about building one years ago so we called Glen himself. Glen and his son built that motor to showcase its potential. Cunningham supplied the car. It was for sale $ 30k when we called but the decision was to put it in a air boat. Glen asked what we were running combo wise and he said to stick with what you have for packaging reasons. That setup was way to big for our small engine compartment so we did. It must have never went in the boat because Leo ended up with it. Its been back several times to Self for one reason or another for issues and Leo has told us himself. Its a race engine and aches and pains like anything else that wasn't designed for 1000+ HP.

They have awesome potential that's for sure. Leo may have felt they had progressed with the 292 style engines as far as they could, and this looked like the next step for him to go faster. I was told by a source close to Leo that the engine made 1150 HP with a mild tune up when Leo first took delivery of it. This was easily several hundred HP more than he was making with the 292. And it sounds like even more potential is capable beyond that once he gets it ironed out.

Yellow Bullet

Its a different crowd than it used to be when it stated. There is some hard core guys but most wanna talk noise in the "trash or be trashed section". Yes, I hang out there in the tech section as well.

Yes, He said it makes that kinda power. Ours made 1050-1100HP ish but we just wore it out after 15 yrs and parked it. Were building a new one and it will be the last one!

The last 292 or engine period?

The last all out 292 from a production block. Why a production block.....because we class race and that's the rules around here. This one is kicking our a-s and will be over the top and is pretty much a no expense spared deal!

So i have the heads ill be using for this project, going to pickup a nice horizontal band saw to make my cuts, in the meantime I found this guys post he made about his dads custom head for his ford 300, didnt weld instead used epoxy, i wonder why and if its a sound option.


http://www.429-460.com/t12546-ford-300-ls1-6

http://www.flickr.com/photos/512fairlane/sets/72157628557600461/

http://www.flickr.com/photos/512fairlane/sets/72157629294140249/

http://www.flickr.com/photos/512fairlane/sets/72157640375802193/

I was kinda irritated that you paid no attention

the pitch on the ford is different, apparently he just centered the middle two chambers and let the rest fall where they may, pretty sure you are right that on the 292 the head would be reversed, im kinda irritated you edited your other posts you make there was good info in them and now its gone.

and im doing my best to research what needs to be done.