Re: 5.5:1 or 6.1:1 High Compression Heads?
On mine I have insert bearings and a 5.5 Synders.
Works fine and I drive mine a lot. It will cruise at 50mph for hours on end and I have over 15000 miles on the head with no problems. I don't find any increase in top end speed with the 5.5 Head. (about 60mph on the rare occasions I open it right out) but pick up is definitely better -Karl
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