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#1
09-13-2005, 04:14 PM
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Heads
Ok i need some info guys right now i have a 455 with 4x 1H heads on it and i have a chance to get a set of 74 350 GTO # 46 494346 Screw 2.11 1.66 89 will this give me better performance then the stock 455 4x 1H heads ???
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#2
09-13-2005, 04:25 PM
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Replacing your 114cc heads with a pair of 89cc heads will give better performance for sure..........grab´em.
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#3
09-13-2005, 04:42 PM
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You will need to watch the rest of your build to make sure the comp ratio does not go too high if you want to run pump gas.
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#4
09-13-2005, 04:57 PM
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I have a set of these heads as well...but I thought the valves were 1.96\1.66. With the small chambers, I always thought they might be a good head to port and use on my 406.
Chris |
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#5
09-13-2005, 07:10 PM
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Definitely double check that valve size as I too thought they were small valves. Still, the chamber size is much more favorable and adding larger valves isn't a problem.
__________________
---------------------------- '72 Formula 400 Lucerne Blue, Blue Deluxe interior - My first car! '73 Firebird 350/4-speed Black on Black, mix & match. |
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#6
09-13-2005, 08:45 PM
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Thanks for the info guys i am going to grab on to them here is a link to a pontiac site with head id and stuff from 1959 to 1981 thats where i got the info on these heads and it shows in 1974 2 sets of #46 heads one set with the bigger valves 2.11 1.66 89 volume and the other set with smaller valves 1.96 1.66 ...98 volume take a look http://www.angelfire.com/on/geebjen/heads.html
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