Thanks for your reply bud.

I think I have the wrong shells (early type for later block) As orginally I did have an early block, but mid build it was scrapped for a better late one.

Like I said the orgianl early block was fine with these same shells. It was just the fact the muppet I bought them off said there is only 1 type of shell for the CVH that made me wonder.

Cheers