The first production 6 Loopers were made by cutting the base off one D blook and cutting the top 2 cylinders off another D block. The 2 parts were then welded 100 % thru and then adding a horse shoe like part to the base to allow fitting to the 75H tower housing. The 2 loopers that I have are the first 2 sixes built by Quincy. John McMullen bought the first the spring of 66 and I bought the second the spring of 67. Paul or Gene would know if they ever patterned a 6 block for casting. I think that the engine that Bruce built from 2 D's was not welded, but just held in positon between the case and the heads. I attached a couple of pics of the block that I ran at Hillsdale and had to resurface. You can see the suttle difference in the color where the weld is between the #4 and #5 cylinders and the larger base for the tower housing.
Attachment 52009Attachment 52010
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