Head Rebuilds

Basic standard head rebuild - applicable to standard, SE and Sprint heads
The head is totally stripped, chemically cleaned, and then inspected. Anything found suspect during inspection is replaced as well as (typically) the valves, guides, valve seats, springs, cam followers, cam bearings, exhaust studs and nuts, and inlet studs. The head is the rebuilt using the existing cams, and is returned freshly painted and ready to fit.

Big Valve Sprint Conversion - using existing standard or SE heads
In addition to the work carried out in a basic rebuild the head is fitted with larger inlet valves (and seats) and Sprint profile camshafts. The combustion chamber shape is modified and in the same process the compression ratio is increased.

Sprint Special 360
The head is fully rebuilt and the ports are worked to further improve gas flow. Our own modified cam profiles are fitted and, with further increases in the compression ratio, deliver a very tractable 135-140 BHP at 6000RPM

Competition 420
This is the head of choice for an engine that will driven hard on the track but also needs to be used on the road. Porting work and combustion chamber modifications are similar to the 360 spec engine but the cam profile fitted gives higher lift and needs appropriate followers, spriongs and retainers. This head will produce 145-150 bhp below 6500 rpm and still remain road tractable.

Competition 450
This spec delivers a dedicated race head. Oversize (1.26 and 1.4) valves are fitted with appropriate work to the ports and combustion chamber and our high lift Q450 cams are fitted in bronze guides and with appropriate followers, springs, etc. With correct carburation and an appropriate bottom end these heads can produce 160 bhp.

In addition to rebuilding your existing head we can also supply completely new castings