516 head question
Going to 1.74 shouldn't be a problem unless the head has a bad case of core shift. I've done it a few times never had a problem. Even went to 1.81 a few times. Blend the sharp edges and you will be fine. 2.14s and 1.81 on these heads.
Going to 1.74 shouldn't be a problem unless the head has a bad case of core shift. I've done it a few times never had a problem. Even went to 1.81 a few times. Blend the sharp edges and you will be fine. 2.14s and 1.81 on these heads.