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Old 05-21-2002, 03:04 PM
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Post 420 ci smallblock chevy

can anybody tell me how they make a 420 ci smallblock chevy? It is a 400 smallblock bored .030 over with 3.875 stroke. What has a 3.875 stroke?
thanks,
rich

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Old 05-21-2002, 03:13 PM
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A 421 is a 400 block with a 427 crank and 5.4 inch rods.

Is that what your talking about?
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Old 05-21-2002, 06:28 PM
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I think you could regrind and weld the stock crank off center to get the longer stroke, or you could order a custom crank (probly the best bet).speed-o-motive carriers them, although I have never delt with them.

I think you would have a hard time putting a big block crank in a small block

[ May 21, 2002: Message edited by: jeff of nc ]</p>
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Old 05-22-2002, 04:15 AM
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A 420 chevy small block is a 400 block bored .030 over and using a 3.875 rod.
(you can make a 426 sb by boring .060 but thats mighty much in a 400)

the pistons and crank are custom pieces.

paw engines sells a kit with: block, crank, rods, pistons, cam, rings and chain for 3695usd. which might sound like a lot. but iss your choice of cams and you can substitute or delete parts to get the package you want

id say go with it, and get a set of motown 220, race heads @495uds a piece, they flow huge and handles .700 lift. add a roler cam and your on your way to 600 hp for less than 9 bucks per pony
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Old 05-22-2002, 10:22 AM
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hey duece do you know where i can find that kit on the net. I don't have that catalog even though i need it. What is special with the pistons and crank, can i buy just the crank and pistons?
thanks
rich
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Old 05-22-2002, 07:36 PM
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try the speed-o-motive link above, there catalog lists a crank, H-beams, pistons and rings for $1995 Only thing I dont like are the pistons 11.4:1 with 76cc heads, but I'm sure the would swap them.
did I mention its all fordged?
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Old 05-25-2002, 01:29 AM
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the paw engines have the following web address: www.pawengineparts.com
and phone 818-678-3000. id call them up and discuss what you need. they even sell a remanufactured standard bore block.. they are nice people. good luck with it.

Regards Jakob
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