I'm not sure if I have ever seen a 351W in a 65-66 where one header or the other did not contact a shock tower. The fit is tight. You should factor in motor mounts that allow some adjustability so you can center the motor for best header clearance on each side. The Ron Morris and TCP mounts do this, I believe. The other potential issue is hood clearance. Some care has to be taken when choosing an intake manifold and drop-base air filter.
my iron head, hedman headered 351 clears... by no more than 1/8 " on either side. this is with stock, 66 style mounts. if you go to my cardomain page, the last picture down gives an idea of how much room you have to work with.
I'm not sure if I have ever seen a 351W in a 65-66 where one header or the other did not contact a shock tower. The fit is tight. You should factor in motor mounts that allow some adjustability so you can center the motor for best header clearance on each side. The Ron Morris and TCP mounts do this, I believe. The other potential issue is hood clearance. Some care has to be taken when choosing an intake manifold and drop-base air filter.
I'm not sure if I have ever seen a 351W in a 65-66 where one header or the other did not contact a shock tower. The fit is tight. You should factor in motor mounts that allow some adjustability so you can center the motor for best header clearance on each side. The Ron Morris and TCP mounts do this, I believe. The other potential issue is hood clearance. Some care has to be taken when choosing an intake manifold and drop-base air filter.
ill say it again... with the PROPER headers, and a bit of wiggling of the motor mount as you tighten them down, you can drop a 351 into a 65 with no shock tower issues. the intake, however is another problem.