5 things known about Knowlton's Thunderheads
* KTRE are among the best cylinder head porters in the country. It is our specialty. We designed the Mondello/Knowlton cylinder head for the Oldsmobile and the first all-out race engine we built with the heads made 880 HP and 656 torque on the dyno.

* Home of a 5-axis CNC machine programed to re-produce Knowltons headporting designs.(See our Online Store for programs and prices)

* KTRE designed the top-end package and ported the cylinder heads for the 2005 Royal Purple HEMI Engine Challange winner, Lofgren Auto Specialties, as seen in Mopar Muscle magazine.

* KTRE built Stock Racings 806 Chevy that was put on the 2006 Car Craft chassis dyno: 1106 HP and 1014 torque to the wheels! The highest horsepower naturally aspirated at the event.

* KTRE built their first ProMod motor in 2006 for Stock Racing. In 2008 they made it all the way to the semi-finals at the San Antonio IHRA event. Best ET of 6.13 @ 236 MPH.

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nowlton's is known nationwide as the specialists in engine building and assembling process. Building high horsepower, reliable engines with years of on-the-field experience combined with the best in engine building technologies to bring you the most competitive engine for your chassis.

Tried, tested, and proven: Knowlton's Engines are built to handle the serious competitve horsepower you require; using products and equipment proven to work for your application. Competition valves, rods, pistons, cranks; you name it, we have it.

Did you also know we have CNC capabilities and sell complete packages ready to go at our online store? Our CNC P&P process is unbelievable and WILL result in the best flow numbers and WILL gain you the most horsepower from our research on the science and art of head port flow technology. We offer these heads as well as many other products on our ONLINE STORE and can also do the machining to your engine head.

Give your racer the quality, competitive edge with custom cylinder heads, race engines, and headporting from Knowlton's Thunderheads & Racing Engines. With 7 years' experience in the industry, our staff has the expertise to provide you with any custom part, system, or service for your performance engine. Whatever your upgrade goals or expectations, contact us today and let us help you move your car to the front of the pack.

Contact us today for cylinder heads, race engines, and custom engine design.