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The 565 can make large amounts of horsepower and ...
The 565 cid engine is ready for its carburetor, i...
The foundation for the 565 is a Dart Big M block....
With clearances checked, bearings lubricated, and...
To properly feed the 565 big block the air it nee...
Accurate cam timing is critical on any race engin...
The finished product on Trick Flow’s Superflow en...
The longer (6.050 inch) ARP head studs required a...
After switching back to C-12 fuel, Todd and Cory ...
Building A Top Class 565 Engine
Get The Recipe for Building a Versatile Big Block Chevy Sportsman Race Engine
By Alan Rebescher
What does it take to put a top-notch Sportsman drag racing engine in the winner’s bracket? Obviously, parts selection, assembly expertise and a talented driver are key.
Over the years, Engine Builder has been an advocate of mastering the first two the last one is always a gamble. But in some cases for that driver, winning begets winning. The 2012 IHRA Summit Racing SuperSeries Top Class champion, Tim Butler of Sarasota, FL, received as part of his prize package, a brand new American Racing Cars dragster with a 565 cid Big Block Chevy engine build by Trick Flow Specialties.
While Trick Flow may be best known for developing cylinder heads for high performance street and racing applications, the company also knows a thing or two about building engines. Over the years they have put together hundreds of engines, ranging from docile small block Chevys to blown LS motors, torque monster big block Fords and Chevys, and everything in between. Simply put, they know how to build solid, reliable horspower when it counts.
The complete package we outline here was developed to be a prize package so we’re happy to present the “recipe” to you. Follow the plan to the letter or make adjustments to parts and components to see how your results differ.
Why a 565?
According to Trick Flow manager Mike Downs, with a large 4.600˝ bore, 4.250˝stroke, and a 6.535˝ rod, the 565 can make large amounts of horsepower and torque, yet uses readily available parts and requires minimal machine work. Better, yet, the 565 is adaptable to many IHRA sportsman and bracket classes.
Here are the building blocks for the engine:
Engine Block: The Dart Big M is one of the strongest blocks available for big Chevys. The cast iron block has race-ready features like scalloped outer water jacket walls to improve coolant flow around the cylinder barrels, four-bolt billet steel main caps with splayed outer bolts, a true priority main oil system, a stepped main oil gallery to increase oil flow to the crank at high rpm, and lifter valley head stud bosses to prevent blown head gaskets.
Crankshaft: Callies forged Magnum crankshaft, manufactured from 4340 steel, is given multiple heat treatments for greatly improved wear and strength characteristics. The 4.250˝ stroke crank has gun-drilled mains and fully profiled counterweights.
Pistons and Rings: JE forged pistons have a 46cc dome with two valve reliefs, vertical gas ports, and an oil rail support. The ring pack consists of .043˝ plasma-moly coated ductile iron top rings, .043˝ phosphate-coated iron secondary rings, and a low-tension 3mm oil ring.
Connecting Rods: Manley 6.535˝ H-beam rods are made from forged 4340 steel alloy and are fully machined, stress relieved, and magnafluxed. Each rod set is weight-matched to within 2 grams and come with ARP cap screw rod bolts.
Main and Rod Bearings: The Clevite main bearings have an exclusive TriArmor coating that offers extraordinary protection and lubricity. The bearings have enlarged chamfers at the sides for greater crank-fillet clearance and are made without flash plating for better seating.
Cam Bearings: The Dart roller bearings can handle large amounts of spring pressure, decrease power-robbing friction, and hold closer oil tolerances. The bearings are steel jacketed and encapsulated for ease of installation.
Camshaft: The COMP Cams roller cam, ground specifically for this engine, has 283°/296° duration @ .050˝ and .824/.785 inches of lift with a 1.7 ratio rocker arm.
Timing System: The two-piece Jesel Belt Drive system reduces the amount of harmonics being transferred to the camshaft. That means solid cam timing compared to some other types of timing setups. It also has an external cam timing adjustment feature that allows you to accurately set cam timing.
There are no special tricks or double-secret procedures to building a reliable race engine. It’s all about taking your time, keeping things clean and well lubricated, and most importantly, measuring everything twice, if you have to. The steps followed by Trick Flow’s engine builder and tuner Todd Hodges are probably the same as you would follow when assembling an engine...or should be.
Cylinder Heads and Valvetrain Setup
With a large 4.600˝ bore, 4.250˝ stroke, and a 6.535˝ rod, the 565 can make large amounts of horsepower and torque, yet uses readily available parts and requires minimal machine work. Better, yet, the 565 is adaptable to many IHRA sportsman and bracket classes.
Trick Flow’s Downs says the cylinder heads used for this engine are pretty special. Considering the horsepower and rpm goals of the 565, the cylinder heads are, in fact, critical. Downs says Trick Flow’s best offering for big block Chevy is the PowerPort 360 cylinder head. The PowerPort 360 features:
Heart-shaped 122cc combustion chambers with 2.300/1.880 inch valves;
360cc intake/137cc exhaust Fast As Cast runners near CNC-ported performance in an as-cast design;
Exhaust ports raised .300˝ from stock; and
CNC-bowl blended valve seat transitions and 24 degree valve angles.
Downs said that the PowerPort 360 head needed some enhancements to feed 565 cubic inches of race engine, so they turned to someone who knows his way around cylinder heads current NHRA Pro Stock Champion Jason Line.
Active in KB Racing’s engine development and tuning programs, Line can’t resist the challenge of making something run faster, flow better, or make more power.
He made some revisions to the intake ports and did a bit of work on the combustion chambers to help give the incoming air and fuel a more direct shot at the valves no trickery or fancy port work involved.
The Last of the Bolt-Ons
Along with the installation of the Trick Flow PowerPort 360 cylinder heads, which had been massaged by drag racer and diehard engine guy Jason Line, we also bolted on the Trick Flow R-Series intake manifold for photo purposes; it was removed for a trip to the porting and polishing room for some airflow enhancements. The rest of the bolt-ons included the following:
Holley Ultra Dominator carburetor, 1,250 cfm;
MSD Pro-Billet crank trigger distributor and crank trigger kit;
Moroso electric water pump;
Moroso vacuum pump; and
Moroso valve covers.
After assembling the cylinder head and valvetrain assembly for the 565, it became time to find out what this conglomeration of parts was worth on the dyno. Without giving up the results in the first paragraph, let’s just say those parts are worth a lot of horsepower.
With the engine all buttoned up, it was rolled into Trick Flow’s Superflow dyno room for some power pulls. Engine builder and dyno operator Todd Hodges added a set of Hedman Husler 2-3/8˝ to 2-1/2˝ stepped headers and hooked the distributor to the dyno’s MSD 6AL ignition system.
After making the break-in pull, Todd and Trick Flow’s resident tuning expert Cory Roth made a several power pulls on VP C-12 racing fuel, making incremental timing and carburetor jetting changes. Todd also tried a power pull with Q16, a 116 octane fuel that is highly oxygenated, allowing more aggressive tuning. With no other changes, the Q16 was worth an extra 13 horsepower.
Unfortunately, Todd and Cory ran out of Q16 before he could make tuning changes to take advantage of the fuel’s power potential. They switched back to C-12, reduced carburetor jetting from 106 to 102, added a carburetor spacer, and increased engine vacuum in a final attempt to break the 1,000 horsepower mark. The changes worked, netting 1,013 peak horsepower at 7,400 rpm and 770 lbs.-ft. peak torque at 6,100 rpm.
The 565 is proof positive of what kind of power you can make with the proper selection of parts and some well-thought-out airflow enhancements. For more information, visit www.trickflow.com.