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I was wanting to either mill the head some on my 750sx or buy an aftermarket head with domes. Which is the better route to go? I still wanna run pump gas 91 octane
Thanks
Early sp heads ("A" castings) cannot be modified correctly for premium pump gas as they are thin castings and the domes are almost 33cc to start with. You would be better off with a stock "D" casting as opposed to trying to modify an "A" for premium pump gas.
Also, all of the OE head castings need to be re-chambered to properly modify them for premium pump gas, unless of course half arsed is good enough...
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