The 2402557 head is a 1 year only head from 1963.It was used on the 413 & the chrysler 300J motors.Its a small exhaust valve head,as its a medium size valve at 1.74& a intake valve of 2.08.You need to post if its a removalble pedastile type head or if its a solid mount type.And if its still a four bolt valve cover or 6.Measure the port height and width to post please,and some pics.Since these are not very common,and a 1 year only head,it might only be a non reasearched head for flow numbers.Is it a open chamber or closed chamber head,mrmopartech
if you want email me your number to call you about other items of the head,MMt
