[HWYSTR455]

This may be relevant when talking about cores & lobes:

"One final note about lobe separation angles − the cam cores that are available for each application are designed for nominal, standard lobe separation
angles. Straying from this nominal angle too far in one direction or another
can result in the heat-treated surface of the core being ground through to
the soft material underneath. Soft lobes will fail in an engine if allowed to run
for very long. Whether or not the heat-treated surface is ground through also
is obviously dependent on the lobe being ground on the core.

The bottom line is that not all grinds can go on every core that is available.

More popular engines, like the Small Block Chevy, have a variety of cores
available with varying lobe separation angles that can accommodate almost any grind. Less popular applications, like the Flathead Ford V8, only
have one core available. Therefore, they are somewhat limited in terms of
what grind will fit on the single existing core."

Also, for core prefix, I thought 51- is a Pontiac core, 54- looks to be an LS core.

54-000-11 GM LS LS1 Engine (1997-Present)

51-000-9 PONTIAC 265-455 V8 (1955-81)

So depending on the desired profile, you may have to begin with a diff core than a Pontiac one.

I suspect if the lobes on a core are compatible with an .842 type lifter/roller (or other), you can use a core from that engine group/make.

MASTER SUFFIX CODES FOR VARIOUS
ROLLER CAM JOURNAL DIAMETERS:
T 1.750" (Very Small-V6 Buick, etc.)
N 0.900" Base Circle Diameter (Any Journal Size)
S 1.868" (Small Block Chevrolet)
B 1.948" or 1.968" (Big Block Chevrolet or 50mm)
F 2.036", 2.051" or 2.081"
(Small Block Ford and Cleveland)
R 2.1653" or 2.1234" (55mm, LS1 or Big Block Ford)
M 2.3622" (60mm)
MASTER SUFFIX CODES FOR
VARIOUS ROLLER LIFTER WHEEL DIAMETERS:
E 0.812" (from 0.792" to 0.832")
G 0.850" (from 0.830" to 0.870")
H 0.950" (from 0.930" to 0.970")
U 2.000" (1.000" Radius Sliding Tappet)
No Suffix Standard (from 0.750" to 0.790")



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