Question: Do You Need Steam Holes On 400 SBC Heads?

Will 400 heads fit on a 350?

The only difference is that 400 heads have steam holes drilled in them for the 400 block.

You can put 400 heads on a 350 but you should not put 350 heads on a 400 without drilling the steam holes..

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.

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.

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.

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.

Can you put Vortec heads on a 400 SBC?

400ci Engine Blueprinted. Some engines just won’t go away. Back in the May ’11 issue, we brought you the first part of our budget-built 400 small block Chevy. The idea was to bolt a set of iron Vortec heads on a junkyard 400 small block Chevy, add a cam, and enjoy the torque.

What size heads for 400 SBC?

A hot 400 SBC can easily use a head with 200+ cc intake port volume.

What are cylinder head steam holes?

The steam holes were designed to rid the cooling system of steam caused by localized heating under some conditions due to the 400 block having siamesed cylinders (meaning the cylinder’s OD’s are physically connected to each other due to the large bore size combined with the block having the same bore spacing as the …

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.

How much horsepower do headers add to a 350?

The length of the primary tubing determines the effective rpm range, but headers can be worth 15-20 hp on the right application. Run on our restrictive two-barrel 350, the headers improved the power output to 248 hp and 365 lb-ft of torque, with consistent gains through the rev range.

Are Vortec heads better than double hump 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.

Why is a 383 better than a 400?

The 383 is meant to be a higher compression engine, using either the 5.7″ or 6.0″ rods. 400 uses a 5.5″ rod. The less oversquare you have in an engine, the more torque that’s produced.

What is a steam hole?

Steam Hole, Exhaust Steam, Protect Moisture. Open the steam hole (Stopper of steam exhaust) when using it in the microwave. It will exhaust the hot steam inside the container and keep the moisture on food.

How far can you bore a 400 SBC?

you can go . 060 on a 400.. helps if you run a longer rod to get some of the pressure off the cylinder walls..its best not to go over .

How much HP does a 383 stroker make?

That combo would probably make around 465 hp and nearly 500 lb-ft, but at less rpm. But never mind that. The point here is 502 lb-ft at 4,700 rpm and 500-plus horsepower from 5,700-6,200 rpm….Hot Rod’s Proven Recipe For A Simple Chevy 383 That Knocks Down 500 HP And 500 LB-FT.True 383 PowerRPMLB-FTHP6,20042550222 more rows•Oct 13, 2009

What vehicles came with 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.

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.