Sherman's Small Block Hybrid - Big-Inch Mice In Two Distinct Flavors

Inside Joe Sherman Racing's Hybrid 408 Small-Blocks.

Doug Marion Dec 1, 2009 0 Comment(s)
Sucp_0912_15_z Shermans_small_block_hybrid Pushrods 1/29

In a competition engine, 3/8-inch diameter pushrods are a must. The smaller 5/16-inch diameter pushrods could/would readily bend due to high valve spring pressure.

Crankshaft
Manufacturer: SCAT
Material: 4340 Steel
Stroke: 4.0-inch

Connecting Rods
Manufacturer: SCAT
Material: 4340 Steel
Design: H.D. I-Beam Type, Fully Profiled
Cap Bolts: 7/16-inch
Rod Weight: 600 Grams
Length: 6-Inch
Highlights: Stroker Clearanced

Pistons
Manufacturer: CP
Size: 4.030-inch Forged
Piston Weight: 378 grams
Piston Pin: Tool Steel, .090-inch wall, 0.927-inch dia., 2.50-inch long, 78 grams.
Lateral Gas Ports : 10
Compression Height: 1.00
Ring Package: 043-043-3mm

Sucp_0912_18_z Shermans_small_block_hybrid Positioning 2/29

When using aftermarket aluminum heads and rocker arms, exact care must be given to pushrod positioning. Four of the 16 touched the head hole wall so the Jesel shaft-mounted rocker arms had to be repositioned. This is all part of custom engine building.

Carburetor
Manufacturer: Barry Grant
Model: King Demon 1095 cfm
Jetting: Primaries & Secondaries: pn 94

Intake Manifold
Manufacturer: Edelbrock
Model: Super Victor pn 2925

Engine Blueprint Data
Deck Height: 0.014-inch
Piston-To-Wall Clearance: 0.005-inch
Piston Ring End Gap:
Top: 0.014-0.015-inch
2nd: 0.018-0.020-inch
Main Bearing Clearance: 0.003-inch
Rod Bearing Clearance: 0.0027-inch
Crankshaft End Play: 0.008-inch
Head Gasket Volume: 6.6 cc
Compression Ratio: 11.50:1

Sucp_0912_19_z Shermans_small_block_hybrid Combustion_chamber 3/29

Sherman massaged all the ports to meet his specifications. The combustion chambers are original. You will note that Sherman has run the heads, then removed them for more testing and flow modifications. The stock intake ports are 210cc.

Tuning
Gasoline: Chevron 91 octane
Total Ignition Timing: 35 degrees
Spark Plugs: NGK no. 5672
Gap: 0.045-inch

Sucp_0912_20_z Shermans_small_block_hybrid Valve_stems 4/29

The Air Flow Research 2.08 and 1.60 stainless steel valves feature slimmer 8mm stems. This saves about 10 grams of weight-each. A lighter valvetrain means quicker revving.

SUPER FLOW DYNO TEST RESULTS
RPM TORQUE HORSEPOWER
4,800 554 506
5,200 564 559
5,600 562 599
6,000 554 632
6,400 537 654
6,800 514 667
7,200 484 663
1 3/4-INCH dyno headers & 3-inch magna flow mufflers


Sources

Air Flow Research
Valencia, CA 91355
661-257-8124
AirFlowResearch.com
CP Pistons
Irvine, CA 92614
949-567-9000
http://www.cppistons.com
Scat Enterprises
310/370-5501
scatenterprises.com
Milodon
Simi Valley, CA 93065
805-577-5950
www.milodon.net
Joe Sherman Racing Engines
714-542-0515
www.joeshermanracing.com
Cometic Gasket inc.
Concord, OH
440-354-0777
cometic.com
Barry Grant/Demon
Dahlonega, GA 30533
706-864-8544
www.barrygrant.com
Jesel Valvetrain
732-901-1800
www.jesel.com

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