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Old 04-14-2013, 07:38 PM
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dilema.. which block to build

What would you build and why if you had these 2 blocks just sitting downstairs..

A 1978 4 bolt 350 to a 383...

Or 1971 2 bolt 400 to a 406...


Persuade me to one hahaha. Cheers

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Old 04-14-2013, 08:45 PM
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What do you want to use them for??. And what are your goals and budget??.
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Old 04-14-2013, 08:59 PM
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86 street S10.. either motor would get a scat 4340 arm with 6" I beams and forged pistons.. either motor will go retro roller with good heads (idealy AFR 195 #1036 sitting on flat tops.)

Basically I want an indestructible street motor than can rev to 6000 tops. I know all about the power and torque difference of a 383 and 406, but will a stroked 4 bolt 350 be stronger than a 2 bolt 400? Or is it the other way around haha.
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Old 04-14-2013, 09:34 PM
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If the block tested ok,I would use the 400 for the better breathing.I would like to know what amount of power you need? 6k is a mild engine. The 195 AFRs are good well over 6k on either engine with potential to make decent amount of power
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Old 04-14-2013, 09:35 PM
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Honestly I don't think there is any advantage of a OEM 4 bolt for a street rod.If you want to spend on a stronger bottom end the way to do it is with a OEM 2 bolt converted to splayed 4 bolt aftermarket mains.Machine shop work and have it line honed.

Some of the 4 bolt OEM 400's have been found to have the outer bolt holes cracked.With the 400's it requires more qualifying prep work to insure you have a good block to start with.Sonic check the bores wall's for thickness before boring and mag the block for cracks.Check the deck as well for cracks as well.Bore/hone with torque plates.The bores on 400's do move around alot.195CC heads are a minimum for the 400's and more like 200cc's are a better fit.Aluminum heads for a SCR in the region of 10.0 to 10.5.The bigger 400 is going to accept a bigger cam more easily.If you don't mind adjusting the valves,maybe you would want to consider a solid roller over a hydro roller conversion.
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Old 04-14-2013, 09:54 PM
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Power goals are about 425 to 450 and a boat load of torque.

This will my first performance v8 build.. I have rebuilt from ground - up many 90's stock 305's and 350's for people. Actually im right in the middle of rebuilding a 69 327 for a guys 76 nova. Its pretty much stock except for the hyper pistons and lumpy flat tappet I stuffed in it. For myself I built a deeply modified 3.4 v6 which made an impressive 240 hp on the engine dyno. That is what is currently in my truck, its fun but i want real performance haha.

Im thinking I should go with the 383 on my 4 bolt block and save this 400 for a future build.. I am only 19 so I have many years ahead of me to play around haha. Sounds like the 400 is a desired block as long as it is a good core.
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Old 04-14-2013, 10:01 PM
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match all the parts for the desired RPM range,pick the heads that have the correct flow numbers for the application.Might consider F.I. if bottom end torque is the main goal. what CR are you considering?budget?
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Old 04-14-2013, 10:11 PM
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If I could I would like to keep the build under $5000. Compression I would be wanting from 10:1 - 10.5:1. I would like to set a rev limit to 6000. Its a rediculously light truck so lets say power from 2500-6000 would be nice. I am keeping a standard transmission and 3.73 gears.
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Old 04-14-2013, 10:45 PM
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Going by budget alone, you can build a streetable 350 a lot cheaper than a 400. And considering your truck, as light as it is, I'd go small block, and save the 400. If you can't build a stroked 350, that'll smoke those tires then you got a problem.
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Old 04-14-2013, 10:51 PM
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Quote:
Originally Posted by TSchwartz View Post
Going by budget alone, you can build a streetable 350 a lot cheaper than a 400. And considering your truck, as light as it is, I'd go small block, and save the 400. If you can't build a stroked 350, that'll smoke those tires then you got a problem.
400 is a small block.

OP, if you're looking to make the most power possible, go with the bigger engine. If you're looking for a cruiser, the 350 will be fine.
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Old 04-14-2013, 10:57 PM
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Ya I think I am going to do the 383 route on this one. Time to put the 400 back onto the shelf for a while haha.
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Old 04-15-2013, 06:12 AM
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5k means you will have to bargain hunt a little.
priority of the budget to machine work/balancing and a roller cam,that will use close to 1/2.I hope you have a carb and intake already?
the rest goes to buying the rotating parts including a good balancer,headers and exhaust. assemble yourself,,,,fluids,gaskets,misc,,,
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Old 04-15-2013, 07:43 AM
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If your budget is limited and money is tight then you're going the wrong way to get 450hp.

A single turbo on a bone stock 350 will get you there for less than 2 grand and have much more torque.

You can also go with a blower if you want.
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Old 04-15-2013, 10:42 AM
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Well if it costs me more it costs me more haha. Basically want this block to be a forged 383 with a retro roller and good streetable performing heads. I get rediculously low prices for everything I buy and I am related to my machinist so it does help a little.

And the boost is a good idea.. I might build the 400 with a procharger for my dads jimmy. He just has to pay a good buck to get the block off of me haha.
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Old 04-15-2013, 07:13 PM
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Quote:
Originally Posted by Valkyrie5.7 View Post
400 is a small block.

OP, if you're looking to make the most power possible, go with the bigger engine. If you're looking for a cruiser, the 350 will be fine.
Oops. My bad. I've been working with nothing but Pontiac for so long, I had it straight in my head, BC was talking about the poncho 400, and not the GM 400 SB. DOLT lulz
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