The engine in today'* NASCAR racecars produce upward of 750 horsepower, and they do it without turbochargers, superchargers or particularly exotic components. So how do they make all that power?

Here are some of the factors:

The displacement is large -- 358 cubic inches (5.87 liters). Not many cars have engines this big, but the ones that do usually generate well over 300 horsepower.
The NASCAR engines have extremely radical cam profiles, which open the intake valves much earlier and keep them open longer than street cars. This allows more air to be packed into the cylinders, especially at high speeds.
The intake and exhaust are tuned and tested to provide a boost at certain engine speeds. They are also designed to have very low restriction, and there are no mufflers or catalytic converters to slow the exhaust down either.
They have carburetors that can let in huge volumes of air and fuel -- no fuel injectors on these engines.
They have high intensity programmable ignition systems so the spark timing can be customized to provide the most possible power.
All of the subsystems like coolant pumps, oil pumps, steering pumps and alternators are designed to run at sustained high speeds and temperatures.
When these engines are assembled, they are built to very exacting tolerances (parts are machined more accurately), so that everything fits perfectly. Cylinders are bored to more exacting tolerances than street cars. The crankshafts and other rotating parts are balanced. Making sure that the parts are as close to their exact dimensions as possible helps the engine achieve its maximum potential power and also helps reduce wear. If parts are too big or small, power can be lost due to extra friction or pressure leakage through bigger than necessary gaps.

After the engine is assembled, it runs on the dynamometer for 30 minutes to break it in. The engine is then inspected. The filters are checked for excess metal shavings to make sure no abnormal wear is taking place.

If it passes this test, then it goes on the dynamometer for another two hours. During this test, the ignition timing is dialed in to maximize power and the engine is cycled through various speed and power ranges.

After this test, the engine is inspected thoroughly. The valve train is pulled and the camshaft and lifters are inspected. The insides of the cylinders are examined with borescopes. The cylinders are pressurized and the rate of leak down is measured to see how well the pistons and seals hold the pressure. All of the lines and hoses are checked.

Only after all of these tests and inspections are finished is the engine ready to go to the races.

Hey You asked!

Mmm...mmm!!! Absolutely correct!! I pulled 300 hp outta my 351 Cleveland fairly easily!!

Dude just noticed yer tint on the front windows....dat'* illegal as hell up here! ...is ok on back glass but front sides! ya gotta have limited tint (forget the %)
you never get bothered about it by the coppers?

Nope...In fact I was standing by my car talking with a cop the other day and he said nothing. Around here, there'* so many doing it, they don't enforce it...

same here when i got mine done i got mine 25% back and 35% front cuz i was scared that cops would ticket me but they dont i wish i gotten it darker

These small-block V-8'* have special high-flow heads and incredibly strong valve trains that allow them to crank out 8500rpms(sometimes as much as 9500rpms,for short stretches/runs)all day long for 500 miles,........try THAT with any 'normal'street V-8 engine ,......the cost?upwards of $30-35 thousand a copy

This racing series:

ASA uses LS1 BASED ENGINES
http://www.asaracing.com/index.shtml

The engine is based on the production LS1 V8, featured in the Chevrolet Corvette, Camaro and Caprice (Middle East application), Pontiac Firebird, and Holden Commodore and Statesman (Australian applications).Vortec ASA 5700 engine produces. Rated at 430 horsepower and 430 lb-ft of torque, the engines have proven to supply ample power in race conditions and make for the close, competi tive racing for which they were developed. The Vortec ASA 5700 engine is highly durable and has an expected life of an entire 20-race season. Throughout the season there were no mechanical failures during official competition, including qualifying, qualifying races or main events.

The potential to utilize a single racing powerplant for an entire 20-event ASA season, including testing, practice and qualifying, was previously unheard of and unprecedented in American motorsports. Four of the 26 teams who competed in all 20 ASA events used the same engine for all activities in 2000.

http://www.asaracing.com/2003_news/0...ine_2005.shtml

That'* just sweet!!

Just have to remember that an ASA racing engine is a LONG ways away,in every aspect, from the Winston Cup motors[a 450HP motor wouldn't even get you a qualifying spot to run in the same field],......Winston Cup teams(or Busch Sreies teams,for that matter) wouldn't Dream of running the same motor in more than one race.

I'v heard a guy in my area has a Penske motor in a 72 1/2 Camaro. Dont know for sure,havent seen it. But that is sweet.