Quick Answer: What Size Heads For 400 SBC?

What is a 406 SBC?

A model of simplicity, the 406 combines all the right performance hardware to deliver max power and durability; a bulletproof short block, powerful cylinder heads and induction tuning, performance wet sump oiling system and a vacuum pump to sweeten the deal..

How much horsepower would a stock 400 SBC with Vortec heads?

376 hpWith the stock Vortec heads, the low-compression 400 managed to make 376 hp and almost 450 lb-ft of torque.

What is the bore size of a 400 SBC?

4.125 inchesGeneral Motors achieved the 400 SBC engine’s displacement by increasing the bore to 4.125 inches and the crankshaft stroke to 3.75 inches – actual displacement is just over 400.9 cubic inches. In contrast, the Chevy 350 CID engine uses a bore of 4.00 inches and a stroke of 3.48 inches.

Is a 400 small block better than a 350?

A small block 350 and a 400 have an identical block design. Most accessories will fit either engine. The major difference is found in the casting numbers and the way they are balanced. Most 350 cubic inch engines are internally balanced whereas the 400 engines are not.

What vehicles had a 400 SBC?

The 400 small block Chevy was produced from 1970 until 1977. It was originally installed in big sedans and wagons, but later found its way into some trucks. I don’t believe it was ever put in the Chevelle or Camaro. A co-worker has a very healthy 400 in his ’88 Corvette.

How do I know if my SBC is 400?

How to Identify a Chevy 400 Small BlockOpen the hood and view the engine from the front on the passenger side.Look for the engine code. According to the Chevy-Camaro website, the code is located on a machined pad directly forward of the passenger-side cylinder head, on the front of the engine block.

Do you need steam holes on 400 SBC heads?

[edit] Introduction. The SBC 400 block was designed with steam holes in the deck and heads. … SBC heads with steam holes can be used on other blocks without problem by using a 350 head gasket.

What is a 406 stroker?

a 406 is a 0.030″ over 400 SBC.

How much power can a stock 350 crank handle?

For small-blocks, a safe limit for a cast crank is 500 hp and a maximum of 6,500 rpm. With big-blocks, their bigger mains will handle 650 hp. We’ve seen cast cranks in turbo motors take over 2,000 hp, but we don’t recommend it. These days, 4340 is the standard for forged cranks.

Can you put Vortec heads on a 400 SBC?

In case you missed the story, the best power numbers were gained with a set of GM Performance Parts Vortec heads supplied by Scoggin-Dickey, and even then the 400 small block Chevy managed only 401 hp and 458 lb-ft of torque. … That’s a peak horsepower bump of 65!

What is the biggest SBC you can build?

The stock deck height on a Chevy small-block is 9.025 inches, but the aftermarket has taken its blocks up to 9.500 inches — with some specialty billet applications going as tall as 10.2 inches. The CFE block is set at 10.0 inches.

Can I put Vortec heads on a 350?

If you wanted the Vortec heads on your engine then you would have to buy a new intake manifold to be able to get the TBI set-up onto the heads. … But you would need to buy a TBI intake manifold to bolt up to the Vortec heads. You can’t by a spacer for the Vortec intake manifold.

Are Vortec heads better than double hump heads?

Types of GM Vortec Heads The L31 Vortec heads have larger ports than the older Gen I cast steel heads, so they outflow the older heads. The Vortec heads are a little bit lighter than the older heads and have a “kidney” or “heart” shaped combustion chamber that is more efficient than the double hump chamber.

What’s the best SBC engine?

The potent 327 L84 held the title as the most powerful production small block Chevy engine for nearly 30 years! That’s an impressive feat for an engine developed way back in 1964, especially considering it gave up precious cubic inches to the larger small blocks developed later on.

Why is a 383 better than a 400?

A 4.030 bore 350 block will give you 383 with a 3.75″ stroke crank. The SBC 400 has a much larger BBC sized bore of 4.125″ so it is bigger and better than the smaller bore motor (it has a bigger crank journal as well as being designed from the ground up for a 3.75″ stroke).

Will 327 heads fit on a 350?

They are perfect for a 350. Both the 327 and the 350 have a 4″ bore so they like the same heads. Old heads like that will have softer valve seats, so if you want them to last a long time, you should either replace the seats or run leaded gas in the engine.

Is a 400 SBC a good motor?

Overall, the 400 SBC is a really good block. They do come with a bit shorter connecting rods (5.565″ compared to 5.700″ for the 350) than do most of the other SBC engines out there.

What is the best 400 SBC block?

The 509 is one of the best 400 blocks to use because of the high nickel content and is probably the strongest of the stock 400 blocks. Becareful when you buy it check the boresize on it and make sure you will not have to bore any larger than 30 thousandths over stock bore.

What’s the difference between a 400 small block and a 400 big block?

Though big-block engines are significantly larger than their small-block brethren, the true difference between these two is more about displacement, bore, and stroke than strictly size. Typically, big-block engines have displacements of greater than 400 cubic inches and small block engines have a smaller displacement.

Will Chevy 350 heads fit on a 400?

To use the Small Block Chevy 350 head on a 400 block, it will be necessary to drill six holes in the cylinder heads. Use a 400 head gasket as a template to mark the heads and Drill the 3 holes on the intake side using a 3/16 drill bit at a 10 degree angle towards the exhaust side of the head.

How much HP can you get out of a 400 SBC?

Run on the dyno in carbureted trim, the modified 400-inch small-block produced 524 hp at 6,400 rpm and 486 lb-ft of torque at 4,800 rpm.