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Old 03-04-2004, 05:33 PM
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Sbc 406

Hello,

I was wondering if it takes anything special to build a 406 sbc besides the normal like boring out and things like that? Also a 406 is a 400 block bored .030 over right? How much can you safely bore a 400 block over?

Thanks

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Old 03-04-2004, 08:04 PM
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A 406 is a 400 that is .060" over. That is the maximum you can bore a 400 to safely. Don't bore it this much if you don't have too. I went with a .020" over bore on my 400 instead of the usual .030" kits to hopefully get another rebuild out of it. Once you go to .060" that is it.
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Old 03-04-2004, 08:19 PM
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I thought a 406 is a 400 bored .030 over. Use the same baisc buildup for a 400. You can run a bigger cam and still make good torque. A good solid performance build will yeild high HP and torque. Heads will make a big difference.
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Old 03-04-2004, 08:22 PM
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a 400 +.030 is a 406. At least it has been since 1970.
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Old 03-05-2004, 12:53 AM
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A 406 is .030" over. Don't know what I was thinking.

My engine comes out to 404 ci. with the .020" over bore.
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Old 03-05-2004, 08:35 AM
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I am putting the finishing touches on my 406 build, there was almost no differents between building it and a 350.

I did put 350 rods in it, no different, I just bolted them in as if it was a 350, and I had to drill steam holes in the heads, it was no big deal.
I check all clearances, no problems, the rods cleared the XE274 comp cam just fine.
The 350 rods are stroker rods, if I had of used stock 350 rods, I may have had to grind a little off some of the rod bolts to clear the cam, that again is not that big a deal.

The extra cubic inches are a big deal.

406chevelle
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Old 03-05-2004, 09:08 AM
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I went with 5.7 rods on my 400 also. If you are starting from scratch they are the way to go.
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Old 03-05-2004, 10:37 AM
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Ditto on the rods. With Sportsman ll heads, Comp Cams Magnum 280h, RPM intake and 750 cfm Edelbrock carb mine dynoed at 425 hp at 5200 and 470 lb ft at 4200 and thats a mild set up. I'll tell ya, with a 4 speed and 3.73's there's nothing like it. The torque is amazing and best of all it sounds like a mild 350. I tell everyone its a hopped up 305.
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Old 03-05-2004, 11:36 AM
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Even though they didn't come with the '73 Camaro, I was tempted to put the 307 emblems on my car. It would only be off by 97 cubes.
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Old 03-05-2004, 11:59 AM
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Ya but what's 97 cubes if you don't know they're there.
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