are these good heads. the valves are 1.84 / 1.50 valves. are these good would these change my compression ratio and would they give more HP or anything.

 

Are they 69 or GT40?
Depends on your cam, but in general they don't flow a whole lot with valves that small.

 

Supposedly 69 351W heads are the best year for W heads, but that sounds like 2v heads possibly off of a truck motor. If they are cheap they would really be good for bigger valvesand a port and polish. They should have the 58cccombustion chambers. What year are the heads that are in the mustang? If you know for a fact that they are 74 or older than yes those heads will raise you compression.

 

the early 351w heads are very similar to the GT40 heads. they have the same (larger) intake ports, and the 1.84 intake valves instead of the 1.78 stock 302/289 valves. they also have a 1.5 exhaust instead of the 1.46 302/289 heads.

chambers should be around 60cc, which is very close to the early 289/302's with 58ish cc and some of the later heads that had 64cc's.


bottom line is they will perform better than stock heads, and with minimal work they are very nice pieces for ford castings. MAIN thing is you need to have hard seats installed to run unleaded gas, and by the time you shell out for extra machine work you might as well grab a set of GT40P's from tristatecylinderheads.com for 600 bucks that come with new larger valves and stiffer springs.

 

my heads are from a 72 ford galaxie

 

I think those heads have pretty small intake runners (like around 145cc) if I am looking at the right data for the heads you have. They flow ok, but not near as good as AFR 185s.

 

^^ well basicly no head will flow better than AFR's lol