Riley Two Port SPECIFICATIONS Note: Most parts are OPTIONAL & fully interchangeable with original heads. The Riley Two Port is a faithful reproduction of the original Riley Dual- Valve-In-Head made from 1929 to 1932 for the Model "A" & "B" Ford. This model is the rare 1929 "first version", with the spark plugs on the left side. The Riley Two Port is a powerful, efficient and reliable 12 valve OHV "F" head (8 intakes in the head and 4 exhausts in the block) that more than doubles the horse power, runs cooler, gives better gas mileage, accelerates like a motorcycle, is 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 head. Your Block: For normal road driving and cross-country touring, use a stock Model "A" or "B" Ford four-cylinder block (1928-1934). The block should be rebuilt. Babbitt bearings, are fine, insert bearings will last longer. Use the stock oiling system and rods. We recommend a counter balanced crankshaft and a metal timing gear. Your exhaust valve train, and four intake adjustable tappets must be in place. COMPRESSION RATIO: All Riley Two Port heads are now delivered with a 1/16” deep circular fly-cut above cylinders. This is to help insure that pistons do not touch the combustion chamber. The fly-cut depth also controls compression ratio and cc's of chamber volume. We offer a 136cc version with a 1/16" fly-cut depth (+/-7:1CR @ standard bore) and a 151cc version with a 1/4" fly-cut depth (+/-6.5:1CR @ standard bore). The thickness of the gasket plus the fly-cut should give adequate clearance, but the owner must double check the piston to head fit prior to use. Some engine rebuilds have the pistons higher than flush with deck, which increases compression ratio. Oversized cylinder bores increase CR Example: our 136cc version is 7.36:1CR @ .080" overbore, with flat top pistons, flush with deck and our .060” uncompressed thickness. Our 151cc version is 6.8:1CR @ .080 oversize. Customers needing higher CR’s can order head without a fly-cut and a re-decking up to 3/8" milled off. Ratios approaching 10:1+ are possible. Customers needing lower CR’s will need to machine material off each piston's top or obtain pistons with lowered pin centers or have rod-bearing center changed. Combustion Chamber: Roof surface is now partially machined to improve compression ratio accuracy and appearance. Wire Groove: Each head is grooved 2-1/4" between cylinders 1 & 2 and 3 & 4 for a stainless steel Fire Wire to improve gasket clamping. Head Studs: Special length studs are grade eight, 8740 Chromoly, with rolled threads. The very best available, nuts are grade eight. Camshaft: Use a Model "B" camshaft reground for most touring, near stock idle and fast road driving. Intake Port Covers: We supply two per head, aluminum "port cover" that read "RILEY", can be polished. Used to cover unused intake ports on side of the block. Intake Manifold: OPTIONAL: Choose from: Dual down-draft uses Stromberg/Holley three bolt carburetors; OR a dual up-draft (uses 2 Zenith or Winfield). Inquire, we usually can supply manifolds to hold almost any number and type of carburetors: Single, doubles, triples, up or down-draft. Exhaust Manifold: Use the stock Ford cast iron exhaust manifold or a "flathead" type four tube exhaust header. Springs: Ford Model "A", eight per head. Normal stock tension. Keepers: Ford Model "A". Valve Guides: Ford Model "A" brand new re-machined split cast iron. Valve Plugs: All heads are now supplied with four billet aluminum Valve Plugs. These are to be press fit into both the valve guide and the old valve seat OF THE BLOCK. The final installation must be done by a machinist usually at the time the block is decked and to insure proper seating at the valve seat. The Plug should be either dead flush with engine deck (machined with deck) or "just" below the deck. These optional use plugs improve oil return and give additional gasket support when using the solid copper gasket. Valve Covers: The name "TWO PORT RILEY" de-bossed on the top in large clear letters that will not polish off. The gasket supplied is a quality "U" channel neoprene gasket. The covers are 3/8" higher than stock cover to give better clearance to the rockers. Spark Plugs: Spark plug holes bored and threaded for 14mm, 3/4" reach, flat seat plugs. Not supplied. Studs: We supply aircraft quality grade eight head studs, manifold studs, water pump studs and nuts. The very best and strongest. Gaskets: 1 solid copper annealed .062" thick head gasket is supplied. 2 Intake manifold, 1 water pump, 2 felt oiler pads, 2 fire wires, and OHV cover gaskets supplied. Push Rods: Adjustable solid push rods with 1/2" dia. adjusters. We make these from scratch. Our tappet seat bolts are supplied. You must supply "single locker" adjustable tappets. Water Pump: Is the stock 1928 to 1931 Model "A" water pump with a "locating collar" installed on the shaft. There will not be a shaft locator boss inside the cylinder head. This was done to improve water flow. Collars are available from Mac’s (A8511C). Most owners report their head’s are running exceptionally cool and some have changed thermostats to raise the temp. OPTIONAL early Ford V-8 water pump adapters and water block off plates are available. Water Gooseneck: Cast 356-T6 aluminum special fit around valve covers. Fits all years. Distributor: Each head is shipped with a "RILEY" Distributor Riser part, 356-T6 aluminum, fully machined and a longer distributor drive shaft. This extension will raise your Model "A" or "B" distributor up two inches so the stock "wing" caps and the Model "A" spark advance will clear the valve covers. Mallory and other distributors will fit. Distributor Riser must be sealed with silicone sealer between it and the head. No gasket, just a touch of sealer. A thin paper gasket can be fabricated if desired. Distributor Drive Shaft: The shaft has been made approximately 1/4" longer. This is due to variances at the drive gear assembly, engine deck machine depth and other factors. Simply grind an equal amount off each end to get to the correct length for your engine. Oil Pressure: Each head is "trick" machined to feed low pressure oil to the head and rocker system. Oil returns to the engine block via the pushrod channels. This will effectively oil the R2P valve train along with the low pressure feed to the rocker shafts and rocker arms. We continue to recommend using the felt pads to seal the vent holes, silence the valves and for holding oil. Distributor Riser must be sealed with silicone sealer between it and the head. No gasket, just a touch of sealer. A thin paper gasket can be fabricated if desired. Distributor Drive Shaft: The shaft has been made approximately 1/4" longer. This is due to variances at the drive gear assembly, engine deck machine depth and other factors. Simply grind an equal amount off each end to get to the correct length for your engine. Oil Pressure: Each head is "trick" machined to feed low pressure oil to the head and rocker system. Oil returns to the engine block via the pushrod channels. This will effectively oil the R2P valve train along with the low pressure feed to the rocker shafts and rocker arms. These sharp 3/8" thick and solid finned aluminum plates fit all stock and modified "A" & "B" engines. The perfect addition to those of you with new or original Riley OHV conversions. . . . and of course, even if you don't have the conversion, these look great anyway! The thick castings can be drilled and tapped for oil lines anywhere on the plate. Polishing not included. Prices & specs subject to change w/o notice. Shipping: From U.S.A. Each head will be assembled and packed for safe shipment by UPS. Shipping/crating costs payable in advance and is $85.00. US. Every Buyer Must Sign a "Release and Hold Harmless Agreement" before head will be shipped. WARRANTY: The USA Wholesalers warrants for thirty (30) days, that the workmanship and materials of the Riley Two Port are as represented. If the head is modified buy the customer in any way whatsoever the warranty is null and void. When you receive your head, inspect it, if it does not appear correct, call us and we will arrange for a full refund, repair or exchange. This product makes increased horsepower and is used as an automotive racing product, therefore no other warranty is expressed or implied. The warranty is non transferable. Having said that, be assured that we stand behind the Riley Two Port as stated above. Contact Pearson’s, as your first port of call, if problems arise. All heads and associated parts, are shipped directly from the USA Wholesalers. None are stocked by Pearson’s. Return shipping, if required, will be at the customers expense.