Custom-made billet camshafts:

Custom-made billet camshafts:

A few questions, some interesting answers – By Bertie S. Brown: Most camshafts look indistinguishable from one another—even custom camshafts. “Not mine,” declares blown alcohol pulling tractor champion Mike Wilhite. “Mine are 2.5 inches in diameter.” Wilhite, who runs an engine shop in Bardstown, KY, thirty miles south of Louisville, purchases a 12ft length of 2.5in case-hardened 8620 alloy steel or S7 tool steel bar stock. He then takes the long length of round bar to Russ Yoder at Erson Cams, who makes four camshafts from it. When finish-ground and heat treated, Wilhite installs the custom-made billet camshafts in the engines of his alcohol pulling-tractor customers. Six-cylinder inline engines adapted for pulling tractor competitions begin life as 200hp diesels revving to 1,500rpm, but when increased to 505ci (Light Super Stock) and converted to alcohol and assisted by three turbochargers they generate close to 4,000hp and 7,000rpm. On the topic of pulling tractors, Yoder says, “We’ve made camshafts for 7.8 liter Ford diesels to an A22 International, from Cummins to Walkinshaw, Oliver to Massey Ferguson, Allis Chalmers to antique pulling tractors with engines originating from the 1920s.” Why no shelf stock for the extreme categories? “Its common practice for competition engine builders to increase cam bearing sizes, and our shelf-stock materials accommodate increases of up to 60mm for big-block Chevrolets and also big-block Fords and for some Hemi engines,” says Yoder. “But, beyond this it just isn’t practical to inventory cam cores of such diversity.” Hence, in this regard, Erson identifies the optimum grade of steel required, the customer brings them the appropriate round bar stock (some measuring 70mm), and...
Small block Hemi enters Grudge racing:

Small block Hemi enters Grudge racing:

Speed, adrenaline, and pure theatrics – By Fergus Ogilvy: Grudge racing has dominated the drag racing scene in the southern US States for decades. But in recent years, the Internet has conquered every part of its frenetic life, particularly Facebook postings that have expanded its Southern origins (Georgia, Florida, and the Carolinas) westward to the Mississippi and north to the shores of Lake Michigan. To its masses, its chief dynamic is straight forward: betting. There is no maximum amount—when a dollar changes hands it’s a Grudge race. An addictive quality, the money won and lost, sometimes in sizable proportions, is only surpassed by pride or poor judgment of its car owners, entrants, drivers, and spectators: such an adventure, such potential for gain, such drama. Still, in the rapid passing of a one-eighth mile, the prospects of returning home $10,000 poorer are agonizing! A strictly cash economy In their pre-race negotiations, a Grudge racer attempts to learn as much as possible about his rival, his racing history, and the competitiveness of his car. They operate with “stips”, an abbreviation for stipulations that specify what is allowed: small block-powered car on 28/10.5 tires with a cast intake manifold and a single 4bl or dual 4bl carburetors.  If your opponent has a history of swapping engines, the stips might have a clause that allows his rival to view the engine before the race. When all is settled, perhaps a week in advance of the race, the deposits of the two opponents are sent to a third party, a neutral person known as the “DP” man—a further abbreviation for Deposit man. The deposit...