4.1L question and casting #'s...

86White TR

New Member
I have a 4.1L Motor still in the regal it came in, the casting #'s are 25514291. Is this block a good one to start with? :confused:

My plans are to have the rotating assembly rebuilt with maybe some forged pistons. The top end is going to be champ irons, 60's w/ chip and a port matched intake. I want to run low boost, not planning on more than 20lbs.

Would the HP/Torque differnce be noticable from the 3.8L vs the 4.1L with the same combo and is it worth it?
Stock stroke, big cam, and champion irons. You'll unshroud the valves with the bigger bore. Depending on the turbo, it should perform.