Two FEs--One Polygraph Room
Sister Block 2 with 4.155-inches of stroke, an 830-cfm Holley, and an aggressive Comp Cams roller mechanical cam delivered 131 more horsepower and 105 more lb-ft of torque. Like Block 1, Jim and Jeff took what they knew worked and applied it to the 482 to get the 641 hp and 608 lb-ft of torque. There are always ways to make more power--more cam, a larger carb, advanced timing, richer jetting, and bigger heads--but you also want durability from your FE or all the power in the world won't make any difference. It's always a compromise between power and durability--an engine that will finish the race. Stroking the large-bore 427 to 482 ci gives this mill deep lungs and more torque. This is what 4.155 inches of stroke from a Crower billet crank will do for the 427 block. Here's what's inside.
|Crower steel billet crank||95191C|
|Manley steel H-beam rods||14072-8|
|ARP 2000 rod bolts|
|Comp Cams custom roller camshaft||33-000-9|
|Comp Cams roller mechanical lifters||839-16|
|Comp Cams push rods||8470-16|
|Comp Cams valvesprings||927-16|
|Melling high-volume oil pump||M-57HV|
|ARP oil pump shaft||154-7902|
|C5AE-H experimental aluminum heads 2.18-/1.72-inch Intake/exhaust)|
|T&D rocker shaft assembly||7021|
|Mallory distributor Pertronix Ignitor conversion||ML-181|
|Holley HP, 830-cfm carburetor||0-80509-1|
|1-Inch carb spacer||R9136|
12a Rocker arm assemblies...
12a Rocker arm assemblies get a generous pre-lube with 30-weight and engine assembly lube.
12b The main thing is to...
12b The main thing is to get rocker shaft pedestals and oil holes in proper locations; otherwise you won't get oil to the shaft.
13 Valve lash is normally...
13 Valve lash is normally 0.025-inch cold and 0.022-inch hot (30 minutes idle time, no load). This varies depending on what you want the cam to do.
14 Our harmonic balancer...
14 Our harmonic balancer is remanufactured. The spacer is lubed and installed first, then, the balancer, which is specific to the 427.
15a Block 1 on the JGM dyno...
15a Block 1 on the JGM dyno made 510 horsepower and 503 lb-ft of torque.
15b Large tube headers may...
15b Large tube headers may have lost us torque.
16a Minor jet changes offered...
16a Minor jet changes offered very little effect, which confirmed Jim and Jeff's gut decision on fuel system setup--going richer didn't improve power.
16b Block 1 got an original...
16b Block 1 got an original 780-cfm Le Mans bowl Holley. Block 2 got the 830-cfm Holley HP with Le Mans bowls.
17 Pertronix makes Ignitor...
17 Pertronix makes Ignitor upgrade kits for all kinds of classic performance ignitions including this old Mallory Unilite popper.
18 JGM Performance Engineering runs 30-weight Joe Gibbs BR30 break-in oil on all dyno tests. BR30 has the right additives for streamlined break-in including flat-tappet cams.