How much horsepower would a stock 400 SBC with Vortec heads?
376 hp
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?
With our low-compression, power-adder friendly 400-inch small-block easily exceeding 525 hp, it was time for some boost. And that’s where things start to get very interesting.
How big can you make a 400 SBC?
Again by 1970, GM engineers had stretched that stroke out to 3.75- inches to create the 400. Increasing stroke means you must also increase the size of the crankshaft counterweights in order to offset the weight of the piston and rod swinging through a larger arc.
How much HP 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.
How to get a SBC around 500 hp?
Sure the aftermarket manufacturers want us to believe their stuff is a requirement if you want this kind of power but that’s not always true. Here’s what can be done: 475 to 500 HP on pump gas using factory block, crank, rods and heads for around $2,000.00.
What kind of car is a 550hp SBC 400?
My brother had a race gas 358″ small block real world dyno’d at 514hp in his ’81 Malibu stock suspension bracket car. The car weighed 3120 race ready with a 1.76 powerglide, 5.14’s, ATI 5500 stall 8″ converter, Hoosier 30×9 radial slicks, and went 10.45 @ 128 with a 1.46 60 foot off the footbrake.
Can a small block Chevy make 400 hp?
In our experience, you must have a decent set of cylinder heads in order to make 400 hp on a basic, low-compression 350 c.i.d. small-block Chevy. Let’s start by assuming (here we go) that your short block is in decent shape.
Can a 350 C I make 400 hp?
It’s not easy to make 400 hp with a basic 350 Chevy using stock heads. The advent of modern engines that make 400 hp or more has colored the reality of the past. In our experience, you must have a decent set of cylinder heads in order to make 400 hp on a basic, low-compression 350 c.i.d. small-block Chevy.
