Well we are building an 454 for my 66. The 454 is bored .060 with 10.5/1 comp
Roller rockers
Heads are the exact same as the 70 450hp specs. 224/188
Cam: .566 gross valve lift
Duration at 50 is 224/224
850 Dominator carb.
3 inch collectors to the mufflers.
Need any more info for your educated guess?
Thanks. Was wondering
Jack 66
Jack Thorpe
