I have a mildly built 318 in my '74 Duster. It currently has the stock 318 heads that were cleaned up with a 3-angle valve job. A friend of mine has a pair of 340 heads sitting on the shelf. I don't know what year they are or what car they came off of, but they came off a 340. What would the gains be in installing these heads on my engine? I have a 340 cam/valve springs with an edelbrock performer intake and carb. The block has been bored .30 over with 9.1 compression. Would the gains in power be very noticable? Or are there better heads available?
All info is appreciated. Thanks
All info is appreciated. Thanks
