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

376 hp
See all 12 photos Here’s the 400 with the stock Vortec heads on the dyno at Westech. We retained the stock Vortec springs to break in the cam. With the stock Vortec heads, the low-compression 400 managed to make 376 hp and almost 450 lb-ft of torque.

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

How much HP can a stock 400 SBC handle? Registered. 400 cranks are nodular iron and will handle 500 hp easy.

Can you put Vortec heads on a 400 small block?

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. Right away, we ran into snags….400ci Engine Blueprinted.

How much power can Vortec heads make?

The original answer was related to modifying the heads to accept more valve lift. Our original answer combined the Chevrolet Hot cam with a set of these Vortec heads. Our estimate then and now is around 350-375 horsepower. Your question relates to porting the Vortec heads to improve the flow, which is a great idea.

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.

Will 400 heads fit on a 350?

They are most likely cracked. They are decent flowing head but with 76cc chambers your compression ratio will be low.

Is a 400 SBC a good motor?

Evening all… the 400 is a great motor especially for street use. It has the power where you really need it. As far as overheating goes, make sure you have a good cooling system and you should be fine.

How much horsepower do Vortec heads add to a 350?

Vortec heads instantly added 55 or more horsepower to a regular 350 head with the same displacement. Automotive enthusiasts are quick to note that the 350 and the 5.7 Vortec are essentially the same engine with the same displacement. The 350 designation is the cubic inch measurement that also translates to 5.7 liters.

Will Chevy 400 heads fit a 350?

What size heads for 400 SBC?

A hot 400 SBC can easily use a head with 200+ cc intake port volume. 180cc will work OK, but will run out of breathe real quick. My 383 uses 210cc heads with 2.05 intakes.

How much horsepower will Edelbrock heads add?

Going from a stock head to a well ported head would add about 70hp to it. As cast, the flow numbers given by Edelbrock suggest this head will make over 500 hp.

How much horsepower do performance heads add?

Depending on your cam, you can gain anywhere from 40-70hp. Cam and heads can gain you 100+hp.

https://www.youtube.com/watch?v=HdLacRyqBGY