1. Our 327 build up started with a four-bolt 350 block. The block was bored 0.030-over before installation of the reciprocating assembly.
2. Though the 302, 327 and 350 all share the same 4.0-inch bore, they all run different cranks. The 3.25-inch 327 crank splits the middle between the 3.0-inch 302 and 3.48-inch 350.
3. Our build up featured a set of 6.0-inch Crower rods, though the factory rods will suffice at this power level.
4. Wanting to duplicate the 11.0:1 compression used in the L76 327, the short-block featured domed pistons from Probe Racing.
5. Valvetrain components were from Comp Cams. Even though we have less duration with this stick and the famed 30-30 Duntov cam, we’ll still make more power.
6. Moroso supplied a trick pan, pump and windage tray for our 327.
7. One of the keys to performance on any motor is head flow. The AFR heads featured fully CNC-ported 227-cc intake ports that flowed over 300 cfm.
8. The extensive CNC port work is evident in this shot of the bowl and valve guide. These AFR heads improved head flow by 50-percent over the factory fuelie heads.
9. The exhaust flow was equally impressive. The 85cc exhaust ports actually flowed more than the intake ports of the fuelie heads (226 cfm).
10. Comp Cams also supplied a set of 1.5 ratio High Tech roller rockers for our build. We also tried a set of aluminum Gold rockers (same ratio) that allowed the motor to rev a little higher without valve float.
11. To illustrate the differences in induction system, we tested a pair of intakes on the 327, including this dual-plane, RPM Air Gap from Edelbrock.
12. Designed to optimize power production higher in the rev range, we also included this single-plane intake from Procomp Electronics.
13. Fuel was supplied by a Holley 950 HP carburetor. Likely a tad oversized for this application, the 950 Holley performed flawlessly on the 327.
14. MSD supplied the ignition system for our build up, including this billet distributor, wires and a 6A ignition amplifier.
15. Exhaust was sent through a set of 1-3/4-inch Hooker Super Comp headers to 18-inch collector extensions.
16. Run on the dyno with the single-plane intake from Procomp Electrionics, the modified 327 produced 462 hp at 6,800 rpm and 412 lb-ft of torque at 5,200 rpm. This represented a jump of nearly 110 hp over the L76 configuration.