Posted by 74merc (IP: 207.157.60.2) on December 26, 1999 at 06:44:48:
In Reply to: Okay okay...: posted by T.L. on December 25, 1999 at 17:40:07:
a few different sources, one guy that has built them and cc-ed the chambers verified 58cc(although I can't verify the difference between different heads, mine may be bigger, could be smaller, we all know Ford quality hit a low spot in the mid-late 70s). said the exhaust sucks, but small chambers. anyways, the info I got was they were all 58.2 cc until like 77, then, like you said, 69+, until like 84-85, when they went to 64. anyways...
: ...There have been several variations in chamber volumes in these heads; the smallest was the '63 Hi Perf 289 version at 47.7-50.7cc, then came the early production 289 head at 52.3cc, but the MAJORITY of 289 heads are listed as "standard" at 53.5cc. There were some variations in early 302 chamber volumes, BUT the MAJORITY of post '68 heads are 63.2cc (I don't know where you got your specs). Any difference in compression ratio in these engines were related to piston height. And I'm glad to hear that you know the basics...
: : I was referring to you saying the combustion chamber size, 62cc will put the 74s down to 7.*. explain that. were the castings that irregular?
: : who's the one that needs to think? you need to read the whole thread, its in your friggin title that I'm asking about. duh.
: : oh, and I didn't say anything about a "book"... I was beyond the basics about 6 years ago...
: :
: : : That's like trying to explain the theory of relativity to a third-grader...Valve sizes have NOTHING to do with compression ratio...Look it up in your "book" ...If you're gonna argue with someone, it's a good idea to know what the heck you're talking about, don't ya think??...Learn the basics first & then come talk to me...
: : :
: : : : then the 74 compression ratio is more like 7.7:1.
: : : : explain it better than that, that's the only problem I have with you, you tell stuff and don't explain it. it takes 3 posts to get the information outta you.