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Hi,
"the VX cams don't really make much of a difference"
Maybe. If you just drop in VX that above would happen. If you "tune" some basic settings then it could be the best cam for NA I think.
Here are the summary for cams:
A-kam Lyft: 10.5, Duration: 260 (B17, B19A, B21A, B23A, B19E (84-), B23E (84-), B200E, B230E, B230A, B230ET)
B-kam Lyft: 10.6, Duration: n/a (B21F, B21E, B23ET)
D-kam Lyft: 11.2 Duration: n/a (B19E, B21E)
F-kam = M-kam (F-kam orginal till B21F)
GR-A kam Lyft: 10.24, Duration 252
GR-A T5 kam Lyft: 11.0, Duration 267
GT6 kam Lyft: 12.5, Duration 312 (nockvinkel 107) (racing, kräver minst 2x45 förgasare eller motsvarande)
H-kam Lyft 12.0 in/11.5 ut, Duration 272in / 268ut (B23E 1979-80)
K-kam Lyft: 11.95, Duration: 268 (B23E 1980-83, B19 Sport)
M-kam Lyft: 9.5 in/10.5 ur, Duration: n/a (B21F, B23F, B230F)
T-kam Lyft: 9.94, Duration: n/a (B19ET, B21ET, B23ET, B23FT, B21FT, B230K)
V-kam Lyft: 11.27, Duration: 245.4 (B200E, B230E)
VX-kam Lyft: 11.37 in /10.65 ut, Duration 245.4 in/236.2 ut
VX3-kam Lyft: 11.37 in /10.65 ut, Duration 245.4 in/236.2 ut (hela kammen backad 3 grader senare)
X-Kam Lyft: 10.65, Duration: n/a (B230K)
Y-Kam Lyft: 10.35, Duration: n/a (B200K)
I've used the M cam which originally came with my NA B230 block and it was really so and so. Currently using IPD VX. I'll vouch for VX. Donated the M cam to a 200 series friend and never looked back.
With M cam, a smooth fine idle, average torque at low end but a bit restrictive about 3.5k rpm onwards.
With VX, slight uneven idle (like a sports car), above average low end torque with almost endless power 3k rpm onwards. Advancing the timing a bit at the camshaft produces better low end torque still keeping the free revving top end. Add tighter valve lash and forget the M cam.
Happy hunting!
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