info on gt or xp crossflow heads

[Benny1963]

thinking of bidding on a set of evinrude or johnson gt or xp heads
im running a 175 crossflow powerhead ,my heads are already on
wanting to know if the performance gain from going to these heads
will be worth takeing heads back off and new gaskets
part numbers are 0332544
and 0332545 dont have parts manual to confirm these as being xp or gt
anyone with any knowlege of these please post , they are new in box.
thank you

 

[Benny1963]

Re: info on gt or xp crossflow heads

bump help dhadley faztbullet emmsbarger joe reeves ezeke
need someone with someone that knows these perfomance mods
thanks all

 

[Faztbullet]

Re: info on gt or xp crossflow heads

320643,644 were the best heads ever made for the crossflow. While the 456, 457 heads are good, the later XP/GT heads are ok. Find the 79 235 small bore heads, 323872/873 are a good substitute. You could pick up 8-10 lbs of compression. Only draw back is you going to have to run a minium of 89 octane..

 

[Benny1963]

Re: info on gt or xp crossflow heads

thanks bullet sorry to here your puter crashed
you didnt have it in the boat widya didya lol
so theses supposed xp heads arent werth the effort they are on ebay i was just lookin .with the gas like it is im going to put a hold on my thoughts of performance,
thaks for the help