McGee Greymotor Speedway - Trackburner

 When thinking of the champions of speedcar racing names like Shepherd, Tattersall, Goode, Butterworth, McGavin, Cleveland, Revell, Freeman and Harvey, all reveal that they were

driving Offenhauser speed-cars. Then we look at National Champion Johnnie Stewart with its two National Speed-car Club Championships, all won with a local Holden power speed-car, it certainly has us wondering just what's under the bonnet, so to satisfy our curiosity we took a look and this is what we found:

The engine is a McGee Holden Grey Motor, with a 3-3/16in. +.020 Bore and Min. stroke, fitted with Weslite 179 R pistons, giving a compression ratio of 11.6 to 1. and a McGee constant acceleration cam.

A Wilkinson Scientific Gas Flow cylinder head, with D.E.C. I tin. inlet valves and 1-7/16in. exhaust valves, operated by McGee triple coil valve springs arc fitted and the induction comes from a McGee

direct port ram fuel injection system.  The spark comes via a Scintilla Vertex magneto to Champion 
spark plugs.  Headers are by Lindsay Oiling. The power runs through a dog box to the Ha ibrand quick change two speed rear end.

The length of the car is 9ft. 6in. with a wheelbase of 72in., front track 48in. and rear 47in. The chassis is constructed from :in. 14 gauge chrome Truly arc welded, onto which is fitted a Fiberglass and Aluminum body. Springing it by transverse leaf springs front and rear which are I2in. Ha ibrand map with 5.20 x 12 Goodyear grooved 08 treads up front, and at the rear i3in. Morton and May steel rims with Bin. wide treads for dry, slick. tracks, 54in. wide treads for wet, heavy tracks. Special fea-tures of the car arc the four wheel disc brakes, and a weight jacker. The weight jacker is operated from the cockpit via a lever which alters the weights of the outside front and inside rear wheels to suit track conditions.