(US Patent #5,007,387)

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32Valve Technology

for your

BOSS 351 CLEVELAND OR PANTERA DeTOMASO

32v heads that fit onto any Cleveland Pantera or Boss 351 Mustang.

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They fit onto all Cleveland blocks, use all 4 barrel intakes and exhaust headers, use standard flat top pistons up to 10.5:1 compression ratio. They can produce over 600 street useable H.P. The 4 valves per cylinder have 36% more valve area than large valve Cleveland heads. This valve area can be combined with ports that provide strong mid range torque along with a huge top end. 

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Combustion chamber side of head showing centrally located spark plug, two intake valves and two exhaust valves. The squish band comes in from all corners, accelerating the air towards the spark plug. Making it the fastest burn, least prone to detonation of any combustion chamber possible. With this advantage the compression ratio on pump 92 octane fuel can be half a ratio higher than with a two valve head.

In supercharged, turbocharged or nitrous applications, this also means more forced induction can be used with less chance of detonation. Also even though there is more exhaust valve area with the two exhaust valves, it is accomplished with a smaller valve. These smaller valves are less likely to glow red and pre-ignite the mixture in severe duty applications.

Notice stock head gaskets can be used, and all water holes are located in the exact same location to come through the gasket as in a stock head. 

Combustion chamber volume is 64cc standard. Can be varied from 58cc to 78cc. Stock flat top pistons can be used from 9.0:1 to 10.5:1. For higher compression ratios pop up pistons are available. Valve notches required if camshaft larger than .550” lift and 244degrees @050.  

The “B” heads for 4.0” to 4.060” bore size has valve sizes of: Intakes 2@ 1.650” each. This has a curtain flow area (perimeter of valve X height of lift, the actual flow window, of a single intake valve of 3.300” diameter. And Exhaust sizes 2@1.400” each. This has a curtain flow area of a single 2.800” exhaust valve. This is why the 32 valve heads can produce well over 100 hp more than the best 2valve heads on the market today.

The way this curtain flow area works in the 4 valve per cylinder application is this. The performance gain with the 4 valves per cylinder is not so much at peak valve lift, (an engine is only at peak valve lift for a very few crankshaft degrees), but the flow advantage it has all the way up to full lift and all the way down after full lift. This is when the cylinder is getting more fully charged on the intake stroke and more fully excavated when on the exhaust stroke. For example, at only .050” valve lift the 4 valve head is already flowing 50% more air than the 2 valve head at the same lift. 

Also camshafts can be run that have a wider lobe separation and less duration for the same application. The wider lobe separation purges less intake charge straight out the exhaust when at low speed. This less purging makes for more low end torque, less emissions, and less fuel consumption. Also camshafts with approximately 10 degrees less duration for the same application can be used. This still makes much more overall power than the 2 valve heads, but has the same RPM characteristics where the peaks occur.

Most of the time we prefer mechanical roller camshafts. This enables us to run the spring pressures that enable the extra RPM capability of the 4 valve heads. With hydraulics, the springs have to be lightened up to enable the hydraulics to work properly and this cuts into the extra RPM capability. 

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Intake Port Side

View showing large intake ports for Cleveland 4 barrel intake manifold. Intake flow near 400 CFM will support 800hp normally aspirated on large displacement engine. Smaller 2 barrel runners available for smaller engines or high torque applications.  

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Exhaust Port Side

View showing exhaust ports for Cleveland 4 barrel exhaust headers. 2” minimum headers recommended. Flow over 300 CFM. Smaller 2 barrel exhaust sizes available for high torque applications or smaller engines.

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$12,000.00 Complete Head Package