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Welcome to Atwood Performance, cylinder head porting/building/blueprinting.

Atwood Performance is a business that specializes in engine performance improvements to Harley Davidson motorcycle engines, specifically cylinder head modifications.

When it comes to an engines performance, all good engine builders will agree, it always comes down to the cylinder heads for producing maximum torque & horsepower. While all the other supporting components must be there, the cylinder heads will be the determining factor of the power building potential of the engine. Period.

Here at Atwood Performance, cylinder head modifications are taken very serious. No mass production here. One pair at a time. Attention to detail is key.

Atwood Performance offers several levels of performance, but an infinite level of custom applications will dictate the final product. A product that is decided on by fully understanding the riding style and desired outcome and output of the rider.

Take some time to look through the services offered here and browse through some pictures. You will realize the passion that exists for putting together the finest performance cylinder heads available in anything close to quality and price range.  

Business Hours:


Mon-Fri: 10:00-6:00


Sat: 10:00-2:00


Sunday: Closed



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