302 Small-Block Chevy Build - Race-Inspired '69 Z/28 302 Engine

It's strange how this story came to grace the pages of Super Chevy magazine. John Villages has been attending and racing at Super Chevy shows in California since the very first one. We met up at the 2008 show in Fontana, California, after admiring his Camaro and shooting it for a feature in the magazine.

It turns out that John is an engine builder. He told us about this wild motor he was building, dubbed Little Wolf, for a customer named Clif Warren.

The engine in question is built upon an original '69 DZ 302 Z/28 4-bolt main block. The idea behind using a factory 302 block is to build it with a high-quality aftermarket rotating assembly, valvetrain, and cylinder heads while maintaining a period correct cross-ram 302 intake and '60s visage. Basically, the high-tech parts had to be disguised under the garb of Hugger Orange and an OE factory look.

This would be easy enough to do with the rotating assembly and valvetrain, but disguising the AFR heads would be a different story altogether--this is where the story gets interesting. John partnered up with a CNC machinist, Bill Goyett, who figured out a way to whittle away the face of the modern aluminum cylinder heads and visually make them look like the old cast iron heads of yesteryear. Talk about having your cake and eating it, too.

The custom Airflow Research 195cc Eliminator cylinder heads were treated to full competition port upgrades and now feature a 60cc combustion chamber (they come out of the box with either 65 or 75cc chambers).
The custom Airflow Research 195cc Eliminator cylinder heads were treated to full competiti
The intake and exhaust ports are works of art, as are the exhaust valves...
...which have been smoothed and rounded for better evacuation of exhaust gasses.

The work done to the AFR heads was performed by Bill Goyett of Precision Specialty Service in Palmdale, California. Bill made plaster casts of the stock '69 cylinder heads and from there mapped the contours of the plaster casts into the CNC computer.
The work done to the AFR heads was performed by Bill Goyett of Precision Specialty Service
Prior to any CNC machine work, the accessory holes are filled in, then the machine takes over and starts milling away. (For more pictures and info on the process, check our web site, superchevy.com. We have an exclusive web story on the machining.)
Prior to any CNC machine work, the accessory holes are filled in, then the machine takes o
The set of cylinder heads on top are the original factory cast iron heads, while the set on the bottom are the AFR heads disguised to look like the OE heads. The differences are so subtle it would be hard to tell them apart at first glance. The pair of cast iron heads weighs 94 lbs, while the pair of AFR heads weighs 59 lbs. Any time you take 35 lbs off the nose of a car it's a good thing.
The set of cylinder heads on top are the original factory cast iron heads, while the set o

As mentioned earlier in the story, the original 302 block has been bored .040-over; the cylinder bores measure 4.040. Also, the block has also been decked .025-inch. The current displacement measures in at 333 ci.
As mentioned earlier in the story, the original 302 block has been bored .040-over; the cy
The connecting rods that were used are lengthened Oliver 6.250-inch-long parabolic beam with full floater lightweight wrist pins. Compare the length of the Oliver rod with the length of the stock 5.7 rods.
The connecting rods that were used are lengthened Oliver 6.250-inch-long parabolic beam wi
The pistons being used are SRP/JE forged 12.5:1 compression...

...with Akerly & Childs Hellfire rings (top gap .018-inch, second gap is .020).
The crank that John chose is a Callies 3.250-inch stroke lightweight crank...
...with Federal Mogul H-series race bearings.

After the stoutly-built bottom end is assembled, John buttons it all up.
The cam that was used is a Comp Cams solid roller. The intake lift is .601-inch and duration of 254 at .050; the exhaust lift is .604-inch with 260 duration with a 110 lobe center. The timing chain used is a Cloyes dial adjust with thrust bearing.
The cam that was used is a Comp Cams solid roller. The intake lift is .601-inch and durati
Wherever the fasteners were not visible, ARP bolts were used in the build. In order to keep the period correct look for the engine, owner Clif Warren opted to use reproduction bolts from Classic Industries.
Wherever the fasteners were not visible, ARP bolts were used in the build. In order to kee

Part of keeping with the visual theme of this engine was to use as many NOS parts as possible. That includes the mint timing cover and, of course, period correct bolts.
Part of keeping with the visual theme of this engine was to use as many NOS parts as possi
The oiling system includes a Melling high volume oil pump with ARP drive.
The block was turned over and top dead center was established. The piston is actually positive .002 above deck height. This maximizes the quench which makes for better combustion in the combustion chamber.
The block was turned over and top dead center was established. The piston is actually posi

The one thing on the engine that does not have a stock appearance is the Moroso 7-quart oil pan with built-in windage tray. When it comes to the oiling of the engine, functionality is a priority over aesthetics.
The one thing on the engine that does not have a stock appearance is the Moroso 7-quart oi
Fel-Pro and Cometic gaskets were used throughout the build. The head gaskets seen here are from Cometic.
Fel-Pro and Cometic gaskets were used throughout the build. The head gaskets seen here are
Now the cylinder heads are bolted on. The custom solid roller springs and titanium retainers have already been installed by AFR.
Now the cylinder heads are bolted on. The custom solid roller springs and titanium retaine

Now that the all the major components are bolted on, the orange cans of Krylon are rattled and rolled. Now this is a true Chevy Orange engine.
Now that the all the major components are bolted on, the orange cans of Krylon are rattled
Manley pushrods and Comp Cams race-designed Endure-X solid roller lifters with laser cut oil passages were installed next.
Manley pushrods and Comp Cams race-designed Endure-X solid roller lifters with laser cut o
Crower Enduro 1.55 ratio rockers increase the duration and lift of the already large cam.

In order to complete the look, a beautiful set of NOS valve covers was used, but had to be clearanced as well as having some of the edge shaved off. They fit and they look perfect.
In order to complete the look, a beautiful set of NOS valve covers was used, but had to be
Nothing looks meaner in a '69 Z/28 like the original cross-ram intake. While Warren does own a few original intakes, he opted to use an aftermarket re-pop for this build. In order to use the cross-ram with the AFR heads, a fair amount of work had to go into the shaping and port matching of the intake. The ports had to be moved a little up and over for a proper fit--you can see the groove milled down the side of the intake. Without this groove the intake will not fit onto the AFR heads and the valve covers will not fit either.
Nothing looks meaner in a '69 Z/28 like the original cross-ram intake. While Warren does o
Here's a closer look at the intake before the lid is bolted on. The runners on the intake were also extensively machined and smoothed for the best possible air and fuel flow.
Here's a closer look at the intake before the lid is bolted on. The runners on the intake

Carburetion is two 500 CFM Holley double pumpers that are identical to the ones used in 1969.
Carburetion is two 500 CFM Holley double pumpers that are identical to the ones used in 19
The linkage setup on these carbs is all mechanical. If you notice in the picture, the primaries are open three quarters of the way before the secondaries open.
The linkage setup on these carbs is all mechanical. If you notice in the picture, the prim
With nearly everything bolted on, this is what the Little Wolf looks like. It's a perfect retro looking engine with the best technology that is offered today.
With nearly everything bolted on, this is what the Little Wolf looks like. It's a perfect

Judgment day arrives and the mousey little motor is set up on the dyno at Jim Grubbs Motorsports. Grubbs was also responsible for much of the machine work that went into the block. After the break in period of the engine and incremental pulls, a few power pulls were made, but the numbers were only in the high 400s. It turned out the throttle linkage needed some adjusting because the secondaries were not opening. The high 400s doesn't look too bad if that is just the power from the primaries. After the linkage adjustment and some timing adjustments, another pull was made to 7,500 rpm and the lovely numbers popped up on the screen. At 5,600 rpm, the torque peaked out at 458. Peak horsepower topped off at 534 at 6,700 rpm. Like the original Z/28 race engines, this sucker is a high-rpm beast designed to run on race fuel.

SOURCES
Oliver Connecting Rods	Jim Grubbs Motorsports 28130 Crocker Ave. Unit 331 Valencia CA 91355 661-257-0101
Classic Industries 8-66/-656-1706 www.classicindustries.com	Moroso Guilford CT 2-03/-453-6571 www.moroso.com
COMP Cams	Air Flow Research 10490 Ilex Avenue, Dept. MMFF Pacoima CA 91331
ARP 531 Spectrum Circle Oxnard CA 93030 805-278-7223	Precision Specialty Servive
Callies	Melling www.melling.com