The following is a transcription of a document sent to Mr. Rudy Brandes by Harold Hunter on the 20th December 1956.
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Last year the writer was instrumental in developing a twin overhead camshaft for the A.H. This was done through the assistance and support of Austin Motor Company Canada Ltd. of Hamilton, Ontario and under the direct supervision of C.F.Fowler, Director of Service for North America.
Four of these proto-type conversions were constructed, one of which is at the parent factory in Long Bridge, England under test and further development, one here in Canada currently installed in a "100 S", and two which are now available for any would-be enthusiasts.
The conversion fits directly on a standard block and the head itself is held down by twelve high tensile special studs, incorporating a patented head gasket as used by the Alta motor in the Grand Prix Connaughts.
The installation takes about four hours to assemble on a standard block and the usual time to place the engine in the car. It fits neatly and cleanly in the space allowed and requires no body or frame modifications. The only additional work required is installation of a suitable throttle linkage (quite simple) and a balanced exhaust system. A complete set of assembly instructions is furnished with each kit.
The following readings were obtained from the Dynamometer at the Austin Factory:
BHP..............................215 @ 6000RPM
Maximum Torque.........206# @ 4000RPM
Compression Ratio.........................9.5 to 1
Valve Timing Intake........................35 - 65
Exhaust...........................................65 - 35
The price of $1,100.00 for the conversion kit includes one set of dome top 91/2 to 1 slipper type racing pistons, pulleys, camshafts, valves, springs, castings, studs, nuts, bolts, gaskets, oil lines, distributor shaft, etc., plus assembly instructions. Beautifully made intake manifolds are also supplied, Weslake design, for 1 3/4" to 2" SU carburetors, however, are not supplied.
Fro $1,600.00 we can supply one of two complete motors excepting electrics. One motor is 2660cc and the other is 2994cc. The larger engine is developing 240BHP at 5500 and the torque 227 pounds. This engine would require 2" carburetors and it might be found necessary to install a Jaguar gear box unless you are using a 1956 four speed Healey box.
This summer the engine installed in the "100 S" Healey enjoyed considerable success and on September 27, with Rolly Keith of Boston driving the car, placed first overall and first in class in the 105 mile Indian Summer Trophy Race held at Harewood Acres here in Canada. This race is run on an airport circuit with two chicanes, three hairpin turns, and several other twists and turns of various degrees. It completed the 105 miles in 88 minutes. On a 3300 foot straight-away from out of a 70 mile an hour bend, the car was timed through traps placed near the far end at 144 MPH. The car performed exceptionally well and lapped all thirty-four entrants excepting the second place car, one of the factory Corvettes being prepared for Sebring. Included in the race were the factory entered "100 S" Healey: the factory entered TR 3: the Mercedes Benz factory car, Bill Klinck driving; W.F. Huggler's D type Jag; and a new black Aston Martin DB3X from California??? These cars all finished and were all lapped with the exception of the aforementioned Corvette.
Two weeks before the Indian Summer Trophy Race the car was entered in the Grand Prix at Watkins Glen and drew last position in the line-up. At the end of five laps it was first in "D" class and fourth over all. When an unfortunate Testa Rosa Ferrari flipped in front of our car, our driver stopped to release the contestant in case of fire and in so doing again ended up in last position. He had to maintain this position for six laps, but as the green flag came out and speed was resumed, in the next five laps was again back in first place "D" class and sixth over all. Here he remained until the eighteenth of the twenty-one lap race when he picked up a heavy stone from the car in front which entered the back carburetor through the cold air box and broke #4 piston. Prior to this on the long straightaway at the Glen which leads toward the start-finish he was clocked through traps at 155 MPH.
Delivery of either a conversion kit or complete engine can be made in approximately two weeks on receipt of order. The assembly will be suitably boxed for export, and terms are cash with order, f.o.b. Waterloo, Ontario. You will probably have a small freight charge to add to this when delivered.
The following figures were omitted from the above but is herewith given for your additional information:
0 to 50 MPH - 4.7 seconds
0 to 60 MPH - 6.4 seconds
0 to 70 MPH - 8.0 seconds
0 to 80 MPH - 10.1 seconds
0 to 90 MPH - 12.6 seconds
0 to 100 MPH - 14.8 seconds
Standing 1/4 mile - 14.6 seconds

Document supplied by Steve Pike from Marsh Classic Restorations ( Australia )