Billet Aluminum Hemi Heads for SB Ford & SB Chevy

[thorconstr]

Do I have your attention? I am going to be offering these heads on my site!
They will be complete and ready to bolt on. T&D rockers, valves, springs, carbon fiber valve covers, etc. These are billet aluminum hemi heads. They are made by a wizard in his shop. He has a set on a SB Chevy, naturally aspirated, race gas, in a Chevy II running in a 10 1/2 in slick class, producing over 900hp, turning 8.14 at 173 mph. This is a pretty nasty engine granted, but these heads on a street engine would produce significant hp gains, not to mention looks! No, they are not cheap! Al W.

[BossCER]

Okay Al, I'll bite. I don't see a link or any other obvious way to your site, and a little more info would be nice. You do want to play nice don't you Al?

[thorconstr]

Boss, They will be on my site soon. www.thormotorsports1.com Thanks, Al

[ERA Chas]

"They are made by a wizzard in his shop".

Who's shop??
Who is "he"??

[thorconstr]

Just a guy in a machine shop, he has a long career and experience in performance parts and racing. He has held records and still does hold a record at Bonneville. As seen by his work, he does know what he is doing. He is in the process of patenting the head design.

[Tom Wells]

This link might provide a clue: http://www.rodandcustommachines.com/...hemiheads.html

Tom

[thorconstr]

Except that those heads are cast, not billet! Huge difference.

[Mac VABCH]

I want,NO HAVE TO HAVE them!!!!

[lovehamr]

Looks quite Boss 429ish. I'd like to see some more details like flow rates, manifolding etc.

Steve

[Jac Mac]

I would like to know more about the cooling efficiency and results from extended duration hi-load dyno runs for street & circuit type race use . Drag race results of limited duration prove the porting & flow rates are good. Actual water jacket volume & coolant surface area appear to be minimal if they are indeed cut from a one piece solid billet.

[thorconstr]

Originally Posted by Jac Mac

I would like to know more about the cooling efficiency and results from extended duration hi-load dyno runs for street & circuit type race use . Drag race results of limited duration prove the porting & flow rates are good. Actual water jacket volume & coolant surface area appear to be minimal if they are indeed cut from a one piece solid billet.

The chamber size is about 52cc. depending of what valves are used. The valves on the current configuration are 2.250 intake and 1.625 exhaust.
The flows are slightly over 400 cfm on the intake and nearly 290 on the exhaust.
A quote from Chuck H. "I have applied for a patent on the water jacket design so I don't want to discuss it in detail. I will be running an engine with these heads in a "Streetable" Fox body mustang this month. I will be able to discuss the efficiency of the water jacket after that. One note though is the wrought "Billet" material is more dense than cast material and will transfer heat more readily. Another benefit is the material is more easily repaired should a piston fail or other problems occur."

I hope this answers your question.

[blykins]

I would imagine the port volumes are huge. With 400cfm, they would have to be. This probably wouldn't be the kind of head that you would want to run on the street. It would require a large cam duration to use the airflow.

Large ports, slow port velocity, and large camshaft durations equal less than desireable street manners....the equivilent of trying to drive a Nextel Cup car around town to get groceries.

I would consider using these, but it would be a very large displacement small block 445-460ci.

[thorconstr]

Originally Posted by blykins

I would imagine the port volumes are huge. With 400cfm, they would have to be. This probably wouldn't be the kind of head that you would want to run on the street. It would require a large cam duration to use the airflow.

Large ports, slow port velocity, and large camshaft durations equal less than desireable street manners....the equivilent of trying to drive a Nextel Cup car around town to get groceries.

I would consider using these, but it would be a very large displacement small block 445-460ci.

Quote from the head designer/builder Chuck Hebestreit
" It needs to be explained that these port are a maximum effort type head. While they are to some a large port, they are small compared to others. The velocity can be somewhat controlled by camshaft profile. Having owned Howards cams for years in the past, I understand head/port/cam/manifold interactions fairly well. All that being said, the velocity it better in this head than that of the 351 Cleveland and Boss 302. Without going into theory and fluid dynamics, the entry cross section of the port is smaller than the previous mentioned heads. At some point there will no doubt be several people holding and testing these heads to confirm everything I claim. When the exact figures are know, I will get them out and the measuring can begin. The 400 cfm is at .800 valve lift which is also not a street friendly number. In respect to numbers, the cam manufactures agreed to use .050 lifter rise as a published value for their cams so that people could compare mfg. to mfg. It seems for most "true" high performance heads, .800 lift is a fair figure to compare. While NHRA Pro Stock engines use even greater valve lift, there is not much need for a valve lift of .800. The hemispherical chamber allows for great low lift flow and less turbulence. Turbulence can affect flow velocity in a very negative way.

I have driven my ProMod on the street here in Flagstaff and once ran the Top Fuel Dragster on the streets of Long Beach California, but I don't consider those as street driven cars.

I will make smaller port versions available if needed, but those heads would be simply jewelry.

Of course a larger displacement would be beneficial. The test engine is 347 cubic inches. 4.125 bore x 3.25 stroke. All the real world data that I give will be from this engine. I am using a new generation Boss 302 block. I can't speak to all of the blocks made so far but I will say the one I have is absolutely beautiful. I am partial to the Boss 302 because I set my first Land Speed records many years ago with a Boss 302 in a Pantera at El Mirage dry lake. We set a record every time we unloaded that car for 2 years running. I believe one of those records still stands 20 years later! If someone breaks it I will dust off the Pantera and go get it back!"

[RedBarchetta]

For what a pair of those heads will cost I probably could buy a good used Cobra (complete) in today's market.

They are nice though...good luck with your new product.

[dynoroom]

I believe you'll find that the heads are machined by Chuck Haberstrate. He also machined the Arias hemi/chevy heads in the recent past. The guy has been around and does great work.

Correction on his record though. He currently holds a record at El Mirage not Bonneville.

[thorconstr]

Michael, I believe you are correct. He's a pretty talented guy isn't he?

[thorconstr]

El Mirage, I stand corrected. Thanks!

[dynoroom]

No problem.
& Yes he is talented.

[eschaider]

Sorry just saw the post about the water jacketing ignore this question. Very nice looking pieces!!

Ed

Al,

Will the heads have a provision for water or will they be race only?

Thx,

Ed

[thorconstr]

Steve, The heads were fashioned with a Boss 429 look. I'll get some flow data for you.