[WARPed]

With the advent of this 3" main 455 crank mentioned by Paul Spotts in another post, this brings up another question. Since the 455 and 400 blocks are based the same casting with the exception of bore size, wouldn't the 400 blocks main saddles be stronger just in the fact that there is more meat allowing less flex? This sounds like a win win situation. Paul, could you give us any more details on the new crank?

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10.949@122.54
6.982@99.75
brooksa@gte.net



[This message has been edited by WARPed (edited 01-30-2000).]

[WARPed]

With the advent of this 3" main 455 crank mentioned by Paul Spotts in another post, this brings up another question. Since the 455 and 400 blocks are based the same casting with the exception of bore size, wouldn't the 400 blocks main saddles be stronger just in the fact that there is more meat allowing less flex? This sounds like a win win situation. Paul, could you give us any more details on the new crank?

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10.949@122.54
6.982@99.75
brooksa@gte.net



[This message has been edited by WARPed (edited 01-30-2000).]

[Gach]

I got beat up pretty bad on this topic, over on CP, but hey' I love a debate. WD ( better know as the Witchdoctor ) ,and a really nice guy, seems to think that because it's only .125 more materal added to the block, and another .125 materal in the cap, that even though it adds up to a ¼" more
materal in the main area, that it's not any stronger, but I disagree, the 400 with 3" mains is a much stronger block, an in most cases un-like the 455 blocks will take a .060 over bore with out much problem. Now if they really wanted to do some thing, make this new crank with a 4" stroke, as well' so we can take better advantage of the head flow that's available, you can make 700-750 hp
with a 440 cid motor, rpms is what we need.

[al]

What about cylinder wall thickness. Doesn't the 400 have thicker cylinder walls then the 455's. I have heard that 455's get real thin at 60 over.

[Dick Duclow]

al,
The reason a 455 gets thin at .060 is because a std bore 455 is 4.150 and a std bore 400 (428) is 4.120!! A 455 block is already .030 more bore than a 400, so at .060 it's like a .090 over 400! We limit 400 and 455 blocks to a 4.190 bor. That's .040 over on a 455

[PONTIAC DUDE]

Hey Gach, DITTO.

[WARPed]

I too like the idea of offering both 4.21" and 4" strokes, but if I were only able to make one crank I would have to choose the 455 units. In all likelihood they would out sell the 428 crank 5+ to 1

------------------
10.949@122.54
6.982@99.75
brooksa@gte.net