400 sbc - Chevelle Tech
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post #1 of 24 (permalink) Old Jun 11th, 14, 10:14 PM Thread Starter
Lou
 
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400 sbc

I have a 70 Chevelle with a 355. I was thinking of going big block, but a friend of mine has a 400 sbc that he wants to give me. What are your opinions of the 400. Is it worth building?
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post #2 of 24 (permalink) Old Jun 11th, 14, 11:16 PM
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Chris
 
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Re: 400 sbc

Yes.
Have it checked out before you put any more money out.

That said, For the amount of money I spent on my 406 with rotating assembly I probably could have got a SHP short block.

73 nova,3515#(all steel)Pump gas!(91octane)406ci N/A, best 1/4,1.45 '60,[email protected],10.6 @ 122.38, short shifting,NO tuning!


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post #3 of 24 (permalink) Old Jun 12th, 14, 7:08 AM
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Re: 400 sbc

400 OEM castings are sometimes a crap shoot.

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post #4 of 24 (permalink) Old Jun 12th, 14, 11:04 AM
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Mike
 
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Re: 400 sbc

Quote:
Originally Posted by CNC BLOCKS N/E View Post
400 OEM castings are sometimes a crap shoot.
So is crossing the street

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post #5 of 24 (permalink) Old Jun 12th, 14, 11:05 AM
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Steve
 
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Re: 400 sbc

in the long runs its better money spent on a SHP block but if your friends block is good then 400's make good power when done right.

65 Beaumont Sport Delux,406,AFR 195 Competition Eliminators, Edelbrock Tunnel Ram, Voodoo 60113 Hyd Roller,
540 hp,525 Tq, Faceplated TKO 600.

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post #6 of 24 (permalink) Old Jun 12th, 14, 11:10 AM
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Paul
 
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Re: 400 sbc

If you were thinking about going to a big block, you probably still will be after you build the 400 too.

72 chevelle
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Rpm air-gap
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post #7 of 24 (permalink) Old Jun 12th, 14, 12:01 PM
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Sean
 
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Re: 400 sbc

Build the 400. Everything for the big block will cost 25% more and in the end, if its a street car, the 400 will be more than enough if done right.

1969 Chevelle 406 SBC 700r4 3.55 12.61 @ 107.4 MPH


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Last edited by Sean0301; Jun 12th, 14 at 3:03 PM.
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post #8 of 24 (permalink) Old Jun 12th, 14, 12:16 PM
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Re: 400 sbc

Built a 406 for my 70 years ago - Performer cam, weiand dual plane, 650 eddy carb, headers followed up with a 200R4 $ 3:31 12 bolt posi - Damn that thing was nice, still miss it. Ran great and TONS of torque.

Tighten it till it strips and back it off a quarter turn.
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post #9 of 24 (permalink) Old Jun 12th, 14, 3:42 PM
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Re: 400 sbc

I have seen over the years guys spending good money on bad when it comes to 400 blocks.

Just do a search.

Now if I was basing all my info on just one 400 block!!!

The guy in this link this was his 3rd 400 block LOL
http://www.stevesnovasite.com/forums...d.php?t=220628

Less risk using a 350 block or a Dart over a 400 block.

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post #10 of 24 (permalink) Old Jun 12th, 14, 7:44 PM
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James
 
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Re: 400 sbc

Hope the piston sidewalls are decent, not a lot to shave in there.

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post #11 of 24 (permalink) Old Jun 12th, 14, 10:25 PM Thread Starter
Lou
 
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Re: 400 sbc

Thanks everyone. I would have the block completely checked before I did anything. Not sure what I am going to do. If I decide to go big block, are there specific blocks that are better than others to build a 496?
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post #12 of 24 (permalink) Old Jun 13th, 14, 5:09 AM
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Re: 400 sbc

Quote:
Originally Posted by loumac56 View Post
Thanks everyone. I would have the block completely checked before I did anything. Not sure what I am going to do. If I decide to go big block, are there specific blocks that are better than others to build a 496?
Mag and sonic test is a good place to start.

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post #13 of 24 (permalink) Old Jun 13th, 14, 10:45 PM
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Chris
 
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Re: 400 sbc

Quote:
Originally Posted by CNC BLOCKS N/E View Post
Mag and sonic test is a good place to start.
That was the 1st thing I did with my 400

73 nova,3515#(all steel)Pump gas!(91octane)406ci N/A, best 1/4,1.45 '60,[email protected],10.6 @ 122.38, short shifting,NO tuning!


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post #14 of 24 (permalink) Old Jun 13th, 14, 10:59 PM
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Re: 400 sbc

Quote:
Originally Posted by WHT/73 View Post
That was the 1st thing I did with my 400
I have seen quite a few fail a sonic test and they ended up on ebay.

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post #15 of 24 (permalink) Old Jun 13th, 14, 11:12 PM
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Chris
 
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Re: 400 sbc

I guess I was lucky everything checked out .

73 nova,3515#(all steel)Pump gas!(91octane)406ci N/A, best 1/4,1.45 '60,[email protected],10.6 @ 122.38, short shifting,NO tuning!


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