The 351 Cleveland and the '65 DOHC Indy engine have the same bore spacing - 4.38.Somebody should make a custom block based on the 351C that will take custom made DOHC heads based on the Indy engine.The Indy engine had intake ports between the cams,and exhaust ports in the valley .The Cleveland DOHC would have intake ports in the valley,and exhaust ports out the side,in the conventional locations.As I envision the Cleveland DOHC,it would have the following specs:4.18 bore x 3.42 stroke - 375 CID , 9.375 block deck height , 5.985 con rod length ( 1.75 rod ratio ) , 1.65 piston compression height , 0.030 deck clearance.It would have gear driven cam timing,4 bolt mains on all 5,EFI,optional turbos.It would bring the Ford small block family full circle by pairing up the best small block Ford engine block with the ultimate small block Ford cylinder heads.

 

Send me the parts, and I'll build one for ya. Of course, you will have to pay me about $600 a week for as long as it takes to build it.

Jared

 

you would have to add .175" to the deck height.

 

TMI,I checked my numbers after getting your response and found them to be good. Block deck height is from the centerline of the crankshaft to the block deck surface. The crank throw (1/2 of the stroke) plus the con rod length plus the piston compression height plus the deck clearance should equal the block deck height. 1.71 + 5.985 + 1.65 + 0.030 = 9.375 .

 

Sorry, I ment a stock 351C has a 9.2 deck height.
You would have to add .175" to stock.

 

www.araoengineering.com

 

I think we are familiar with ARAO.
http://www.araoengineering.com/Ford/clevelnd.htm

Very cool and expensive 4 valve heads but not DOHC.

Here's another odd set up.
http://www.coatesengine.com/products.html

When the company started 7-8 years ago, they were making prototype heads for Ford V8s. Now it appears they are into stationary power plants.

 

Nothing is impossible. With goofy looking tall valve covers, and equally goofy looking enclosures on the front of the motor, I can see these heads with a chain-driven twin cam setup.

Jared

 

Quantrex,I see Arao makes 4 valve heads for the Cleveland. Good,more power to them,I hope they are successful. That does,however,mean competition to my 375 CID DOHC Cleveland concept. The Arao heads run a pair of valves off of one cam lobe. That does have an advantage over the DOHC of less rotating mass to accelerate in RPM. But even conventional OHV engines have been known to eat lifters and lobes. That makes me wonder about the longevity of the camshaft and lifters in an Arao head engine. I contend that the DOHC with gear driven cams is still the ultimate in cam/valve configurations. I believe the 375 DOHC has its place even with the Arao heads in existance.

 

Brian,the Coates engine looks to be the wave of the future in auto engines. It has fewer parts,to save the automakers money. They claim it runs cleaner,another factor in its favor. I predict that within ten years everybody will run the Coates engine in new cars. Then again,I could be wrong,I thought that the Wankel would make piston engines obsolete when it came out.

 

It looks great on paper but so have some other designs. The heads they made for the Fords looked the same. They sent me a brochure years ago when they were looking for investors. They have spent millions on research but I still have yet to see any.

Here's another vehicle that was supposed to revolutionize the market.
http://www.solotrek.com/mjet/index1.html