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Small Block Chevy Engines - Stroker Soup

On The Menu Today: Seven Different Big-Inch Small-Block Power Recipes.

By Richard Holdener, Photography by Richard Holdener, Illustration by George Trosley

700HP 400 Engine Specs

Bore x Stroke: 4.125x3.75
Compression: 10.8:1
Cam: Comp Cams XR300HR
Lift 0.562/0.580
Duration: 248/254
Lobe Sep: 110
Heads: Brodix 15-Degree Aluminum
In/Ex Port Vol: 229cc Oval/cc
In/Ex Flow: 325/236 CFM @ 0.700
Valve Sizes: 2.125/1.6
Chamber: 68cc
Intake Manifold: Pro Comp Single-Plane Shoot-Out Plus
Carburetor: Holley 950HP
Headers: Hooker 1 3/4
Power Adder: NOS Dual Shot Cheater
N2O Jetting: 175HP
Oiling System: Moroso

Much like forced induction, the key to a healthy nitrous motor is to start out with a healthy normally aspirated combination. In this case, we wanted to build a stroker combination that produced over 700HP using a quick and easy nitrous system. We turned to NOS for our nitrous needs, and it supplied one of it Dual Shot Cheater systems, which is adjustable from 150HP to 250HP. We ran jetting to supply 175HP to our already healthy normally aspirated combination. The 400-inch small-block featured a ProComp block, crank and rods along with forged slugs from Probe Racing. This same basic short-block was employed on all of the combinations producing over 600HP. The top end included Brodix Head Hunter (oval-port) heads, a Comp XR300 hydraulic roller cam and matching Brodix single-plane intake manifold. Adding the Holley 950 and 1 3/4-inch long-tube headers resulted in peak power numbers of 551HP and 520 lb-ft of torque. Adding the 175HP shot pushed the power numbers to 732HP and 729 lbs-ft of torque. That is one serious chunk of small-block horsepower.

800HP 400 Engine Specs

Bore x Stroke: 4.125x3.75
Compression: 11.0:1
Cam: Comp XR294HR
Lift: 0.540/0.562
Duration: 242/248
Lobe Sep: 110
Heads: Dart Pro 1 227
In/Ex Port Vol: 227cc/85cc
In/Ex Flow: 309/226 CFM @ 0.700
Valve Sizes: 2.08/1.6
Chamber: 66cc
Intake Manifold: Dart Single-Plane-NA/Weiand Blower-SC
Carburetor: Holley 950HP (NA)/Dual Holley 950HPs (SC)
Headers: Hooker 1 3/4
Power Adder: Weiand 8-71 supercharger
Boost: 11.7 PSI
Oiling System: Moroso

The one common mistake often made with supercharged motors is that more power is always available with more boost. This is especially problematic with positive displacement superchargers, as more boost can often be problematic. As with our nitrous motor, the real key to a successful supercharged combination is to start with a powerful normally aspirated one. This will allow you to reach your given power goal using less boost pressure. Less boost means fewer tuning headaches, reduced charge temperatures and a decrease in the likelihood of harmful detonation. Starting with our 400-inch short-block, we installed a set of Dart Pro 1 227 aluminum heads, a Comp XR294HR cam and (before adding the blower) ran the normally aspirated combination with a Dart single-plane intake manifold. In normally aspirated trim, the 400 produced 575HP and 549 lb-ft of torque. After adding the 8-71 Roots-type blower from Weiand and a pair of Holley 950 carburetors, the peak numbers shot up to 819HP and 667 lb-ft of torque at 11.7 PSI. The power curve was still climbing rapidly at our shut-off point of 6,800 RPM. Sure, you have to cut a hole in your hood, but what better reason for a hole or a hood scoop than a massive 8-71 blower? Mad Max would be proud!

By Richard Holdener
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