First- I am not any sort of authority on 305 heads! But according to what I have seen that is very similar if not the same as c/n 416, 434 and 450 heads w/the possible exception of a vertical line that is shown in some renderings of the 416 head.I know it's been asked a millon times, but I cant find the same,almost but not the same markins of my heads. See a picture of on 305.
The intake valve size of these heads- depending on the exact casting number and what they came on originally) can be 1.84". This is a fairly common size on the 416 heads, or so I'm told. So you need to actually measure the intake valve head to be sure of what you have. If this is for a stock engine in a daily driver, this really doesn't matter.Looked them up and thay are 305 1.72/1.50 60 cc 1975 to 80 I also have 305 172//1.50 but hte chaber size is 58 Was wondering ,[want better fuel miles per gallon], if the little smaller chamber, higher comp. would hurt if any?
In my opinion, a burette, stand, sealing plate and a jar of Vaseline should be the first tools a fellow buys for himself when he takes on an engine rebuild. You can't figure anything intelligently until you know the exact chamber volumes. Plus the fact that you can cc heads for others and make back the cost of the tools. Cool. :welcome:http://www.hotrodders.com/forum/ccing-cylinder-heads-171846.html is one of several threads on CC'ing heads at home. You can do a search for others. It's not hard or expensive to do. It'll take a few tries before you get repeatable results but after that it's a breeze!