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Author Topic:   305 vs 350
Dirt Roller

Total posts: 24
posted February 06, 2003 06:02 PM
I had a SBC delivered today that has casting # 355909 Mortec shows this to be a 305 76 to 79 with 2-bolt mains. Is there anyway I can get this motor to be competive in factory stock class with 9:1 compression rule and car weight of 3400# minimum on a half mile dirt track? If so - what would I need to do in regards to the type of cam etc.. to make this motor competitive or should I just get rid of it until I find a 350? Track rules allow for a holley 4412 carb or 4-barrel quadrajet. Any help is greatly appreciated!!!!!

Dirt Roller

Total posts: 17
posted February 11, 2003 05:10 PM
I would go with the 350, it has a quarter inch bigger bore to start with and keep in mind that any upgrade you make to the 305 you could make to the 350 as well. I have heard it said "there is no substitute for cubic inches" so get all you can.
Good luck

Dirt Roller

Total posts: 22
posted February 11, 2003 05:33 PM
I agree, go with the 350, you will have a lot more cam optoins not to mention HP and torque advantage in that heavy car. Parts are also cheaper for a 350. I run the holley 4412 on a short 5/16 track but the Qjet might help you on the longer track if tuned right. the 350 will also help you keep rpm's up in the corners.
good luck

Dirt Full Roller

Total posts: 68
posted February 21, 2003 11:31 AM
I came across this article, thought maybe you'd like to read it.


[This message has been edited by UFnARacing (edited February 21, 2003).]

Dirt Roller

Total posts: 17
posted February 21, 2003 10:48 PM
I read the article, Wow a 305 putting out 356 hp, who would have thunk it? However, I still think that if you put a 350 through that exact same scenario you have a meaner beast for the same amount of money, NO actually you would spend LESS because you wouldn't have to spend the money opening up the intake valves as they did in the test. I will agree that it is possible to make some hp with a 305 but smart money says you get a bigger bang for the same dollar if you use a 350 to start with. Not to mention the fact that the 305 can't really support a mean cam as well as a 350 can. and on, and on, and on

Dirt Forum Champ
Total posts: 1565
posted February 22, 2003 08:41 PM UIN: 54865418
who ever said size doesn't matter never built a race motor lol the only thing better than cubic inches is cubic$$$$$$$$$$$$$$$'s

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