454 mag tune up
#11
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Hi Have a Formula F-303 with 454 Mags and B one's
I would like to do new carbs , manifolds , roller rockers and a cam on each engine would prefer not to do bottom end.
is there a good website for buying tuning parts for 454 mag?
can this be done for a parts cost of about $6,000 U.S a motor
I live in New Zealand and would have to buy and get shipped B/B knowledge is ok but not as great in the U.S also would be looking at props anyone know of a good package I'd like to get around 475hp out of each motor and a prop package that makes really good use of this
I would like to do new carbs , manifolds , roller rockers and a cam on each engine would prefer not to do bottom end.
is there a good website for buying tuning parts for 454 mag?
can this be done for a parts cost of about $6,000 U.S a motor
I live in New Zealand and would have to buy and get shipped B/B knowledge is ok but not as great in the U.S also would be looking at props anyone know of a good package I'd like to get around 475hp out of each motor and a prop package that makes really good use of this
Also, I am not sure how you are thinking about goint about doing this because if you plan on adding an upgraded cam, then in order to do it correctly the FIRST TIME you MAY have to remove the oil pan to avoid future problems or oil leaks. This means removing the entire engines from the boat. Perhaps someone can chime in about having to remove the oil pan. If you are not willing to remove the oil pans in order to install the cam, then you should skip the upgraded cam idea.
The other thing is if you put a cam or more power to an engine that is already too "tired" you may experience more blow-by or even more excelerated wear on the rings/bearings, etc, and can bring even more problems. There is much to consider.
#12
Charter Member # 55
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The only way to get close to 475hp with stock heads is going to be with a roller cam valve train. You're looking at about $2500 US for parts for a roller cam, lifters, timing set, springs, gaskets, valve job, intake and carb. You will need to upgrade the stock exhaust to work with any cam upgrade at about $2000 per engine as well.
Being its a carbed engine, how many hours are on the bottom ends????? If its more than 400hrs, I would consider total rebuilds.
Being its a carbed engine, how many hours are on the bottom ends????? If its more than 400hrs, I would consider total rebuilds.
#13
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Hi guys thanks for the input engines have done a total of 120hrs so dont think they are tired. yes am aware of engines having to be lifted from the boat I feel that my bottom ends are in great condition.
is a 800 cfm carb , header style manifolds , cam and roller ancilliarys enough to chase the high 400hp mark?
is a 800 cfm carb , header style manifolds , cam and roller ancilliarys enough to chase the high 400hp mark?
#16
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You might want to contact "RMBuilder"/Bob Madara of Marine Kinetics in N.Y. 585-654-8583 for your cam application. He is the expert in marine cams and has helped several guys like you here on OSO. He did my cams 4 years ago. He is extremely knowledgable and is a great help.
#17
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Like kaama said, you could get some custom porting done to your heads also. I don't know if you have anybody there taht could do this and shipping to US would be high $$$. For a valve job, springs and port work you're probably looking at close to $800-1000/pair.
Like Kaama said, contact RMbuilder. He can set you up with a package.
#19
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I'd say thats about right depending on your hull, drive and prop efficiency. Make sure you upgrade the springs on the heads to match your final cam choice! Good Luck, have fun!
The people reffered and mentioned here on OSO can keep you on the right track and budget.
Best Regards,
Ray @ Raylar
The people reffered and mentioned here on OSO can keep you on the right track and budget.
Best Regards,
Ray @ Raylar