Briggs animal springs fit perfectly in the hemi, they are a little shorter than 26lb springs. the exhaust will coil bind with anything more than 275-285 lift. They are a little more heavy duty than the 26lb springs with a touch more pressure. good for the guys looking for 8,000 - 9,000 rpm without having to go to dual valve springs, intake valve will need shims under it to bring the seat pressure up to get max seat pressure out of them.
