Mustang Owners Club Australia Forum
Technical & General Discussion Area => Mustang Chat Room => Topic started by: bruceanz@hotmail.com on February 29, 2024, 07:57:23 pm
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Hi I have a 66 Mustang that has a Dart iron block in it. the car badge says 289 but i dont think so because it has 4 bolt crank mains. Ive just pulled the heads off because of a head gasket fault and the casting on the head says 289 but Dart didt make a 289. Bore is roughly 4 inchs and stroke is 85mm or 3.346 inchs i think it might be a 351 or a 347 stroker. 351 had a different firing pattern than standard they were 13726548 and mine has the std 15426378.
Can anyone help please
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Those numbers come to 336 cubes. Likely you've got the stroke slightly wrong and its 331 which used to be a pretty common stroked 302 before 347's became popular. One theory is that the 331 is happier because the rod length to stroke ratio is better.
If its a Dart block I guess someone could have put some old 289 heads on it but you have to wonder why. It's probably a good basis for some aluminium heads and bigger cam.
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^^ This ^^