Search ..... faulty "Speed Six" cylinder heads
Discussion
You wont gain much. They flow very well stock. If you measure the chambers 1 and 6 will be smaller in volume than 3 and 4, due, I reckon, to the head casting bowing as it cools and then being machined "flat". Apart from that there is not a lot wrong with the standard item although the exhaust ports could do with opening out, tricky as you would need to move the manifold bolt holes out. Have thought about this and I have a donor head ready to go under the TIG.... maybe it will become scrap.
J
J
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