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Phatheads Racing Heads
(20% off does not apply on these heads)
Our price is $140.00 for the yz80
$150.00 for 125's
$170.00 for 250's
Free shipping

If you buy one of our bigbore kits we will include a phathead set for $20.00 off the price listed above. Example CR250 - 265cc AMA Legal big bore kit $450.00 or $600.00 with a phathead racing head.
Click here to buy online now
The Phathead racing heads are very similar in design to the Prodesign "coolheads". Like the cool heads the phatheads have interchangeable combustion chambers, allow you to easily change compression and they use o-rings in place of the head gasket.

More horsepower, Better Cooling, Modify Power Band
Phathead sets, with their interchangeable combustion chambers, allow you to easily customize your motorís power band. All Phathead sets include a Phathead body, two domes (combustion chambers) o-rings, coolant hose fittings, head nuts, copper washers, all necessary hardware and installation instructions. The Phathead sets include one dome closest to stock compression and one dome the next step higher. This is the best selection for most riders. For the more experienced motor builders or motorcycles used at higher altitudes there are several other dome sizes available. All Phathead sets use an o-ring seal therefore you do not use a head gasket with the Phathead sets.