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412 inch Small Block Build - The Z06 Slayer

A big-inch small-block that's designed to slay dragons.

By Mike Harrington, Photography by Mike Harrington

In our March and April 2007 issues we ran a series called "The BionicCamaro." The background behind the Bionic Camaro is this: A stock-styledand stock-built '69 Camaro is undergoing a plethora of wicked upgradesthat will make it a serious street contender and bracket brawler. Youcan't be a contender unless you have the power to punch, and that punchcomes from the mill hiding under the hood. As you can well guess, thestock small-block was ditched in favor of a more appropriate powerplant.

Todd Heimroll, owner of the Camaro, stated his goal was to beat a ZO6Corvette and that's it. Some people set goals to lose weight or tofinally clean the garage this year ... but beating a ZO6? Now that's ourkind of target. In the first two installments we covered the front andrear revamps of the suspension. But all the grip in the world won't helpyou without horsepower under the hood.

To achieve his goal of out-gunning the ultimate Corvette, Todd turned toLirones Motorsports for the buildup of his engine. Todd's vision ofpulling away from a plastic surgeon and his Z06 Corvette with a humblelooking '69 Camaro is the stuff dreams are made of. This Camaro is nosleeper--it's built to be a slayer.

Let's get started with a solid foundation for this build. Forget aboutsalvaging a junkyard block and all the machining involved in bringing itback to life. A Dart "Little M" small-block was a solid choice. TheLittle M block is of an iron alloy casting and comes with billet steel4-bolt main caps and a 4.125 cylinder bore with extra thick cylinderwalls. Lirones Motorsports gave it a touch more. Each cylinder measuresin at a 4.155 bore. With a stroke of 3.800-inches, it brings the totaldisplacement of this Mouse up to 412 cubic inches.

Without a doubt, the key to making any kind of decent power lies in theselection of the cylinder heads and the valvetrain. No doubt, AFR hasestablished a reputation of creating some high flowing aluminum cylinderheads. The AFR 227 heads used in this build are the Competition versionand are fully assembled. They feature 100 percent CNC-ported 227ccintake runners and 100 percent CNC-ported 76cc combustion chambers. Theexhaust ports on the 227s are 80cc, while the valves measure 2.100-inch(intake) and 1.600 (exhaust) with 1.550 roller springs. The cam that wasused in this build is a custom-ground solid roller from Sig Erson. Thelift on the intake and exhaust both measure at .580. The duration on theintake is 256 @ .050, while the exhaust is 263 @ .050 with a 108-degreelobe separation. Lunati roller lifters, a Crane adjustable timing chain,Manley push rods and Harland Sharp rockers finish the rest of thevalvetrain. Keeping the entire system in time is an MSD distributor andbox.

Without a doubt, the key to making any kind of decent power lies in the selection of the cylinder heads and the valvetrain. No doubt, AFR has established a reputation of creating some high flowing aluminum cylinder heads. The AFR 227 heads used in this build are the Competition version and are fully assembled. They feature 100 percent CNC-ported 227cc intake runners and 100 percent CNC-ported 76cc combustion chambers. The exhaust ports on the 227s are 80cc, while the valves measure 2.100-inch (intake) and 1.600 (exhaust) with 1.550 roller springs. The cam that was used in this build is a custom-ground solid roller from Sig Erson. The lift on the intake and exhaust both measure at .580. The duration on the intake is 256 @ .050, while the exhaust is 263 @ .050 with a 108-degree lobe separation. Lunati roller lifters, a Crane adjustable timing chain, Manley push rods and Harland Sharp rockers finish the rest of the valvetrain. Keeping the entire system in time is an MSD distributor and box.

SOURCES
Air Flow Research (AFR)
Valencia
CA
N/A
www.airflowresearch.com
Harland Sharp
Strongsville
OH
440-238-3260
www.harlandsharp.com
Callies Performance Products
Fostoria
Oh
419-435-2711
www.callies.com
Holley
Clevite
engineparts.com
Manley Performance Products
Lakewood
NJ
732-905-3366
www.manleyperformance.com
Crane Cams
530 Fentress Blvd.
Daytona Beach
FL  32114
3-86/-252-1151
N/A
www.cranecams.com
MSD
El Paso
TX  79936
915-857-5200
www.msdignition.com
Edelbrock
Dept. 5.0
2700 California St.
Torrance
CA  90503
310-781-2222
www.edelbrock.com
Vrbancic Brothers Racing
1463 E. Philadelphia
Ontario
CA  91761
909-930-9980
Erson Cams
550 Mallory Way
Carson City
NV  89701
775-882-6600
www.mrgasket.com/erson.htm
By Mike Harrington
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