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302 Small-Block Engine Build - A Wolf Among Mice

This Race-Inspired 302 Puts Up Some Mighty Numbers
By Mike Harrington
Photography by Mike Harrington
302 Small Block Chevy Engine Build
302 Small Block Chevy Engine Build
The custom Airflow Research... 
   
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302 Small Block Chevy Engine Build
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).
302 Small Block Chevy Engine Build
The intake and exhaust ports... 
   
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302 Small Block Chevy Engine Build
The intake and exhaust ports are works of art, as are the exhaust valves...
302 Small Block Chevy Engine Build
...which have been smoothed... 
   
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302 Small Block Chevy Engine Build
...which have been smoothed and rounded for better evacuation of exhaust gasses.
302 Small Block Chevy Engine Build
The work done to the AFR heads... 
   
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302 Small Block Chevy Engine Build
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.
302 Small Block Chevy Engine Build
Prior to any CNC machine work,... 
   
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302 Small Block Chevy Engine Build
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.)
302 Small Block Chevy Engine Build
The set of cylinder heads... 
   
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302 Small Block Chevy Engine Build
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.
302 Small Block Chevy Engine Build
As mentioned earlier in the... 
   
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302 Small Block Chevy Engine Build
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.
302 Small Block Chevy Engine Build
The connecting rods that were... 
   
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302 Small Block Chevy Engine Build
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.
302 Small Block Chevy Engine Build
The pistons being used are... 
   
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302 Small Block Chevy Engine Build
The pistons being used are SRP/JE forged 12.5:1 compression...

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302 Small Block Chevy Engine Build 302 Small Block Chevy Engine Build
302 Small Block Chevy Engine Build 302 Small Block Chevy Engine Build

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