| Re: 289 heads--289 4V |  | ||
| Re: Re: 289 heads--289 4V -- Ken Merring | Post Reply | Top of thread | Maverick Message Board |
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Posted by: 74merc ® 2001/07/12, 10:16:49 Author Profile |
::I found a set of 289 heads with the following cast into them
::"289 4V". I assume these are the 289 hi-po heads. obviously the 4v means 4bl carb but are these heads really any better than other 289 or 302 heads. :... :The heads are listed for years 64-67. They have small chambers at 54.5 cc. The compression ratio they would give is dependant on the year 302 used on. Years 68-72 expect 10:1, 73-76 only 8.3 and 77, 9.3. Valve size 1.78/1.45. Opinion is except for a gain in compression they (may) provide, there's no gain in porting or valve size. As for worth it depends on who wants them. A Mustanger might kill for them to make his engine a (factory) HP :spec for the way he wants his car equipped. Best heads from a breathing point of view would be 69-72 351 2v. They bolt on but attention must be paid to the head stud size holes. May need to use washers under the head bolts heads. Also not recommend 289 4v heads be used on a 351 for street use as the ratio would be over 11:1 with small valves ???!!!. :I'm sure Old Guy can add some info and other recomendations on this subject. :Ken these are probably the best flowing stock 289 heads available, small combustion chambers and open exhaust ports.
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