Photos of original cylinder head shown below for general information only.

Our new improved version will be a four port design, where each rocker box will have 2 intake ports.

A special "log" manifold will come with the kit. As time goes along look for updates, drawings, prints and new specs.

ROOF 101 OHV SPECIFICATIONS

The ROOF 101 is a faithful reproduction of the original cast iron 1929 R&R Cyclone OHV cylinder head made from 1929 to 1950 for the Model "A" & "B" Ford. We believe this was the first OHV Model A Ford cylinder head that made it to market. Our model is the rarest 1929 "cast iron version". The ROOF 101 is a powerful, efficient and reliable 8 valve OHV "F" head, four 1.73" diameter intake valves, with 1.5 rocker ratio, in the head and 4 exhausts in the block, that more than double the horse power, runs cooler, gives better gas mileage, acceleration will put a smile on your face. It will be fully oil pressurized, fully adjustable and fits under the hood without modification. Because it is authentic cast iron, you will not have adverse corrosion or expansion problems like you would with a soft aluminum heads. . . .  This new head will incorporate design changes to improve air flow, valve action, cooling, and stability. . . 

Compression Ratio: We plan on offering a 137 cc version (+ - 6.5:1CR @ standard bore). Roof 101 OHV heads will be delivered with a 1/16" deep circular fly-cut above the cylinders. This is to help insure that pistons do not touch the combustion chamber. For higher compression you may mill the deck at your end. The thickness of the gasket plus the fly-cut give adequate clearance.  Some engine rebuilds have the pistons higher than flush with deck, which increases CR.

Combustion Chamber:   . . . it will not look like this original version!

Photo of original cylinder head shown above is for general information only.

The new chamber will be CNC machined. Each chamber matches exactly each other in shape, size and cc's. Each will have plenty of "squish" area. The intake valve is centrally located and one spark plug enters from left side. Turbulence grooves will be added to improve combustion turbulence. The chamber is a modified "wedge", as the valve will be positioned at and angle of about 22 degrees. These specs are subject to change.

Head Studs: Our own custom made grade 8 studs.

Camshaft: Best choice to be determined. A Model "B" camshaft should prove excellent for most touring, near stock idle and fast road driving. Almost any performance cam grind can be used.

Intake Valve: The ROOF 101 uses one large 1.73" intake per cylinder. Additional machine stock will be present to use larger valves and mill out port throat.

Rocker Ratio:  The rocker ratio is 1.5:1. Rockers will be interchangeable for higher ratio and roller tips, etc.

Rocker Arms:  Chevy small block system of rocker arm mounted on a stud.

Intake Port Covers: We supply two aluminum Port Covers per head, that can be polished. These are used to cover unused intake ports on side of the block and will be inscribed with a Roof logo.

Exhaust Manifold: Use the stock Ford cast iron exhaust manifold or a "flathead" type four tube exhaust header.

Valve Plugs:

All heads are supplied with four billet aluminum Valve Plugs (available ahead of time). These are press fit into the valve guide hole and into the valve seat of your block. The final installation is usually done by a machinist.  When rebuilding the engine we recommend that hardened valve seats be cut for all 8 seats, but installed in the exhaust only. The new Valve Plug is then machined to fit the new valve hole and pressed in. The Plug should be either dead flush with engine deck (machined with deck) or "just" below the deck with engines that have been pre-decked. Unlike the Riley 2 Port these Plugs are required for oil return and push rod control and give additional gasket support.

Valve Covers:  Cast aluminum

Spark Plugs: 14mm, 3/4" reach, flat seat plugs.

Push Rods:  Custom made.

Oil Pressure: Each head is "trick" machined to feed low pressure oil to the rocker system. Oil returns to the engine block via the pushrod channels. This will effectively oil the Cyclone valve train.

Shipping: Each head will be assembled and packed for safe shipment by UPS. Shipping/crating costs payable in advance and is  To Be Determined (USA). Overseas shipping available.

We stock replacement parts for all original and repro Riley Two Ports.

Proudly Made in U.S.A.

Every Buyer Must Sign a "Release and Hold Harmless Agreement" before head will be shipped.

Sample copy sent on request.