Aluminum Block60-ft.330 ft.1⁄8 mi.1⁄8 mph1⁄4 mi.1⁄4 mph
Closed exhaust2.1376.1109.45373.1814.88790.91
Open exhaust2.1206.0469.34874.3314.69191.19
Remove fan belt2.0315.8199.01576.4114.19094.26
Iron Block
Closed exhaust2.0896.0269.34873.8214.72190.88
Open exhaust2.0795.9959.29974.1414.69590.98

Pull That Belt
A Cheap Way to Quicker E.T.'s
We'll be the first to admit that fan-belt removal is a risky means of improving dragstrip performance, but if you're looking for a killer timeslip, it's a sure bet. With only the crankshaft pulley spinning, external parasitic drag is eliminated. Successful risk management comes down to pushing the car through the staging lanes (bring lots of friends), starting the engine at the last possible moment before the race, limiting the burnout to the absolute minimum, staging right away, and using a quality mechanical temperature gauge. We always make certain our Valiant's Autometer temperature gauge is at zero when the engine is first started. If the opponent is taking too long to stage, we shut it off and wait. The idea is to limit total running time to 60 seconds or less. If we see anything above 160 degrees at a quarter-mile track or 180 degrees at an eighth-mile track before the light turns green, we abort because temperature climbs rapidly from this point.

If you do it right, surprising results are the norm. What else can you call six-tenths? That's like a six-car-length advantage at the finish line. By the end of a typical beltless race, our Slant Six reaches 200 degrees. To prevent damage, we get off the track as soon as possible and shut the motor off on the return road so the fan belt can be re-installed. Once the pump is turning, coolant temperature falls back to 160 within 20 seconds, and no harm is done. As for the charging system, as long as the battery is in good shape, our MSD 6AL never misses a beat, even when the alternator isn't spinning.

Buzzing Half Dozen: Part Three
ChangeStockHyper-Pak
Rear axle7 1⁄4 Salisbury = 131 lbs8 3 1⁄4 Hotchkis = 201 lbs+70 lbs
Wheels & tires13 inch (4) = 144 lbs14-inch (4) = 152 lbs+8 lbs
Heater20 lbsheater removed-20 lbs
Radiator19-inch, 2-row = 9 lbs19-inch, 4-row = 22 lbs+13 lbs
Floor matthin rubber = 20 lbsACC replacement = 30 lbs+10 lbs
Engine block* iron block 170 = 114 lbsaluminum block 225 = 64 lbs -50 lbs
Spare tire/jack13-inch = 37 lbs spare tire/jack removed -37 lbs
Misc. N/A MSD, Hyper-Pak,
large exhaust =26 lbs +26 lbs
Curb weight2,700 lbs2,720 lbs +20 lbs
A bare raised-deck cast iron 225 block weighs 134 lbs.