Welcome to 4inbore.com the home of the legendary
Angle Flow Head

• These heads have been updated and refined to accept the 4in+ piston.

• We bring you the superior performance that a 4" piston delivers over the smaller traditional air cooled high performance pistons.

• We offer the 4" experience to you, we can develop your customized pair of heads
  based on your specifics and to your desired engine combination.

• Not only do we offer the complete set of heads, but cylinders and pistons in
  conjunction with all the necessary machining to your case or one purchased from us.

• 250hp and 250ftlbs torque on 91 octane fuel

All work is performed by Jeff Denham who developed, built, drove
and raced his 90x103 (pump gas) engine for over (3) three years,
winning two real street events at Irwindale and Las Vegas Speedways.

• YES! These engines can be driven on the street and

• YES! Over 250 streetable horse power, all at under 5,900rpm.

Please do not hesitate to email or call us to order
your 4inBore components today!