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The combustion chambers now have a small radius these pics where just after we had the head skimmed and hardened valve seats fitted.
The throat area of the port was bored out then blended in for both inlet and exhaust as per David Vizard spec. for a big valve head. Exhaust ports have a new shape and opened up mostly at the top and right hand side of the port where most of the flow is, the inlet port has a small radius at the entrance with the remainder up to the start of the valve boss left as is with no polishing in this area just cleaned up. Also Decided to leave half the valve boss but reshaped, better for longer guide life and all have been fitted with thin skirt bronze valve guides. The inlet manifold has been port matched. The head has been machined for double valve springs and all adjustments have been done for all work carried out to suit cam specs head thickness etc.
i will post some more pics when i get a chance everything has now been test fitted.
not to sure if we'll bother to flow test it as this is just to get me back out there having some fun for the mean time.
the chambers & ex ports look very similar to mine without seeing the inlet ?? the onlyother thing i did with mine was to lift the inlet manifold on the studs slightly & machine the inlet manifold to angle slightly up
Yes it'll definitely run alot better thats for sure, but most importantly its a better base to setup and tune as the carbs have now been fully rebuilt before it was a never ending balancing act.
Would of been interesting to see the difference in HP with the manifold machined on a slight angle
Bit of an update since machining the head the engine has come out for a full rebuild while inspecting the bores we saw some pitting of the first bore so we decide to get it sleeved. The flywheel and crank have been machined and balanced also added a winged sump plus new seals gaskets etc throughout the engine and gearbox. I have run it at 1 general practice since the rebuild and walked away very happy just looking forward to some more track time.