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#1
04-16-2005, 11:33 PM
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is a pontiac 400 a big block or small block?
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#2
04-16-2005, 11:33 PM
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is a pontiac 400 a big block or small block?
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#3
04-16-2005, 11:47 PM
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It's neither one.
Pontiacs are not like Chevys that have 2 different distinct engine block sizes. They are the same block size externally. From the first 287 to the 455 they are all the same size, even the heads will swap on all of them. The only exceptions are the short-deck 265/301 'economy' engines. And these are not considered small-blocks.
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1964 Tempest Coupe LS3/4L70E/3.42 1964 Le Mans Convertible 421 HO/TH350/2.56 2002 WS6 Convertible LS1/4L60E/3.23 |
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#4
04-16-2005, 11:49 PM
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It´s a "Pontiac block". All (almost) Pontiac engines has the same physical size. I´ve heard about some "odd" Pontiac engines with other sizes. It´s mentioned somewhere at this forum.
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GTO 1970 455 with Ram Air, 400 auto, 3:31 Posi, Orbit Orange, Black Interior, AC |
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#5
04-16-2005, 11:55 PM
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That is a chebby, ferd, merpar term. Not Pontiac. Small main journal 400 cid & smaller and large main journal 421 and larger.
It is a PONTIAC!!!!!!!!!!!! We can put a 455 crank in a 400 block by cutting down the main journals on the 455 crank. It is about 461 or so then. It is still a Pontiac. 1955-1979 Oh yeah, not applicable to 301 and 263 or whatever it was.
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JLP |
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