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It looks like the biggest differences in cup vs. busch engines is in the Carburetor size and compression ratio.
Makes sense.. I remember when the busch cars were six bangers.. those were the days..
The cars are also lighter, and shorter in Busch.. it doesn’t say here, but the spoiler is also taller *or for the cot* they have one…
Cup Specs
* Engine Displacement: 358in³ (5.9L) Pushrod V8
* Transmission: 4 Speed Manual
* Weight: 3200lbs. (1455kg) Minimum with out driver; 3400lbs. (1545kg) Minimum with driver
* Power Output: ~850 hp (560kw) unrestricted; ~425 hp (317kw) with restrictor plate [3]
* Fuel: 98 octane unleaded gasoline
* Fuel Capacity: 17.75 U.S. Gallons (67.2 Liters)
* Fuel Delivery: Carburetion
* Compression Ratio: 12.5:1
* Aspiration: Naturally aspirated
* Carburetor size: 750-830 cubic feet per minute (354-392 liters per second) 4 barrel
* Wheelbase: 110in (2.8m)
Busch Specs
* Engine Displacement: 358in³ (5.8L) Pushrod V8
* Transmission: 4 Speed Manual
* Weight: 3,100lbs. (1406kg) Minimum (with out driver); 3,300lbs. (1497kg) Minimum (with driver)
* Power Output: 650-700hp (485-522kw) unrestricted, ~450hp (335kw) restricted
* Fuel: 98 octane unleaded gasoline
* Fuel Capacity: 22 U.S. Gallons (83.2 Liters)
* Fuel Delivery: Carburetion
* Compression Ratio: 9:1
* Aspiration: Naturally aspirated
* Carburetor size: 390 Cubic Feet per Minute (184 Liters per Second) 4 Barrel
* Wheelbase: 105in (2.6m)
