Inliners International Forums General Discussion Blown and Injected turbo 292 write up

Don't know what it flowed afterward, he was just trying to satisfy his own curiosity and didn't have anything to lose since he was already a record holder and was going to move up the ladder to the Pro Stock truck class.
He was already making over 500 HP with a N/A 250, and a brazed head with this type of mods were usually water dogs, and probably not a good choice for a street head for that reason.

Yeah, I kind of figured it would not be a good head for a daily driver.

What's nice about the Kirby 12 port aluminum head is that it flows 320 CFM on a street port job that is good for a daily driver.
Sure it's pricey, but it's different, like our inline engine are (not mainstream) not the norm either, and there are not many Kirby heads out there out there.

MBHD

MBHD

Well there not pricey at all I don't think, especially for the level of performance it takes you to from where the bolt-in lump fall short. Your only going to go so fast with a $70 dollar piece of aluminum bolted inside the head. Im sure Sissell considered that at the beginning, the first prototype that was sent to him for him to test was a piece of sheetmetal that was held in place between the head and intake manifold gasket surface. He just refined it into the brazed lump he later became noted for.

Wht does a sissel head go for anyways?

Up date just got the head off today will pull the lumps out tomorrow and see if i can get some prototype dividers going

They start at $3500 and go up from there. Not sure what I will sell mine for once I begin to cast them, but that seems to be the average price for that type of quality piece.

Here are some pics of the upper lumps currently in my engine.

I shaped & made them out of solid billet aluminum, years ago.

Made to increase port velocity. And they do work.

They ended up being to short in height.
But maybe you guys get the idea?








This is how I wanted them to somewhat look like. (Clay pictured)




MBHD

Looks interesting. Why didn't you try to develop it further?

I just installed them onto my current engine in the car.


I did not know how I could make a plug, or casting or have them made.

I just lost interest after I saw the Sissell/Duggan 12 port head years before I even made these upper lumps., Always said to myself, someday I will have a 12 port aluminum head.

If anyone else would like to look into this type of mod, (upper lumps), Is say go for it & post your findings, not just head flow numbers, that's only part of a combination.

I think they would be worth looking into. Never seen anyone make them.

I did flow test my head w/the clay models installed & the flow numbers did improve. Not a huge gain mind you, but more of a gain noted in the 1/4 mile & racing against my friends street/strip cars.
The improvement was most likely due because w/the upper lumps installed the port velocity went up.

The clay model I posted is more what I wanted them to look like but also wanted the long turn radius side to reach closer the the valves for a better flow path.

MBHD

I'd be curious to know how they worked along with the bolt-in lumps. I pretty much have already decided to build a turbo 250 with a divided port head and try to develop that concept further and save my other 12 Port heads for a couple of 292 projects afterwards.

Don't forget you are limiting yourself in HP potential a true 12 port head has much more it it.

Don't do what I have done and chase HP down a dead end, if it's for the street it will be OK otherwise go to 12 port to start.

The cost is more up front but it's worth the price.

It's for a class record Harry and it requires a cast iron head for that class. I know the 12 Port head is vastly superior, but im saving those heads for different engine builds in a couple of other classes.

Well have two lums out and prototypes built(cardboard cutout) not professional like scott;) hould have the 3rd done tomorrow an i got some ideas on how to keep it in place but we shall see how it goes

can you use the drain plug at the rear lower end in the block? and back to the head or T stat housing?

That sounds like it would work.
I just never seen how the guys are plumbing there turbos for water.
Thanks

MBHD

I agree with Twisted . Use the drain hole to feed the pressurized coolant and come out the top of turbo and route to the head or a thermostat housing.

OK, sounds like that will work.

Thanks again.

MBHD