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Old 04-13-2004, 02:41 PM
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choosing block

If you where to build a small block to put out around 350-400hp, what block would you choose, 4 bolt for sure, but what casting number am i looking for.
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Old 04-13-2004, 02:59 PM
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you don't need a 4 bolt at all. 2 bolts are good for up to 5-600 horse. Basically any block will do you fine. Get a newer one if you can, you'll be able to use stock roller cam eqp.

K
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Old 04-13-2004, 03:21 PM
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Would you recomend splayed main caps or the strengthening kit offered here for 450 plus horsepower? Good Insurance for safe reving.

"Super Two-Bolt Mains
Small-block two-bolt main caps are not heralded for their strength, but you can do something to increase the strength of a two-bolt cap. Steel billet main cap support straps from BLP Products (407/422-0394) can strengthen both 350 and 400ci main caps. After 0.500 inch is milled from the cap, the straps bolt in place using standard-length main studs. The rear main strap comes with a special-length oil-pump-retaining stud made exclusively for BLP. It's also a good idea to have the block align-honed after you add these straps, or if you're just changing to main cap studs. Studs or straps change the preload on the caps and will affect the housing bore diameter, and therefore the bearing clearance." (sorry about the pic., its not the best).
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Old 04-13-2004, 04:30 PM
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Thanks guys, what makes the new blocks better though. Gonna be my first build, so i wanna get some facts.
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Old 04-13-2004, 04:50 PM
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If you're going to drop the money on having an align hone done, like with those strengthening straps, I'd think you might as well put a little more down and get a set of splayed caps.

I picked up a set of Eagle billet splayed caps for the 2-bolt block for $80 on ebay.

My current build consists of a 2-bolt 3970010 from a '74 nova I found for $75 on ebay. Strengthen the caps on a seasoned core and you're good for some power.
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Old 04-13-2004, 05:23 PM
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Spayed main caps would probably be over kill for a 400hp 350 it will live just fine with the stock 2 bolt set up. Of course over kill isn't a bad thing by any means but why spend more money than you have to
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Old 04-13-2004, 06:42 PM
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Unless you have got unlimited funding,
a small block chev is the cheapest hp/dollar ratio wise. Parts are plentiful and dirt cheap. A guy can afford to make mistakes on a $150 core vs. starting with a rare and expensive 427 or something. Lay your hands on a solid 350. they are plentiful, if you can afford a rollerized block, get it, but most of them are EFI, so it depends on your application and compatibility. You may be able to adapt an EFI to an older vehicle, but it can be a challenge for a first timer.You can get a manifold for a carbeurated roller, but it adds more cost.Hopefully you can get a block with at least 1.94 valves and a 4 barrel. ( Older truck motors are usually like that) read up to do some backyard porting yourself. You can get a solid 350 hp 350 with out getting too exotic with aftermarket parts. Run the bag off it, blow it up, who cares? get another and learn from your experience. ya gotta love it.
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