Lightening Block

[hall99]

having a motor built and considering lightening the block anyone else doing this? Does tech give you trouble about it? Probably will be running UMP and USCS type rules.

thanks

[powerslide]

UMP=unlimited motor program(lighten away). Not sure about the uscs.

USMTS/usra has to add weight for lightening the block now.

[LITE-INN]

A.) Any American made push-rod type engine will be permitted as long as the rear of the engine bell housing flange is mounted at least 72”-inches forward from the center of the rear axle. The engine offset must remain within two (2”) inches of the center line from the cross member. The minimum engine height when measured from the ground to the center of the crankshaft is 11” inches. Other engines of the push-rod type that meet this criteria may be approved for competition. B.) All engines used in competition must be able to be used in a conventional passenger car without alteration. Alteration of motor mounts will not be permitted. Alteration of the castings and/or fittings will not be permitted. Any machine work on the outside of the engine or machine work on the front or rear of the crankshaft will not be permitted. C.) Aluminum blocks will not be permitted. D.) Magnetos will not be permitted. E.) Wet sump oiling systems must be operative and will go with a claim by DIRTcar officials. Overall dry sump systems will not be permitted. F.) Alteration to the cooling system will be permitted. If alterations to the cooling system are made the stock-appearing hood line must be maintained. G.) The battery must be securely mounted and shielded. The battery must not be mounted inside the driver’s (not a nice word)(not a nice word)(not a nice word)(not a nice word)pit. H.) The exhaust system(s) must be mounted with the exhaust directed away from the vehicle and/or away from the ground (preferably horizontal and outside the body of the car). A maximum of 1/2” inch clearance surrounding the header pipe when directed through the firewall on the driver’s side. Local track rules will prevail when decibel and/or muffler rules. I.) One two or four barrel carburetor is required. the truth hall 99