So I look up comp xe250h specs (I'd say good choice for mild 318) and ran it through the Wallace V/P DCR calculator, AJ got with stock 8.1 318, 140 psi 7.1 DCR and V/P 116, with the xe250h I got 137 psi 6.98 DCR and V/P 111 nothing to write about but for the power gain I doubt this slight loss would kill the bottom end but say it will if you install at Intake center of 103 vs 106 you'd have the same as stock psi dcr v/p or could go somewhere in between and this is the 1st cam I checked.
His choice of ica of 64 I had to go up to the 5th cam in the xe line the comp xe275hl, a cam no one is suggesting for a mild 318 people aren't even suggesting a xe268h. Biggest I say is a xe262h cause we have dyno results of how it works in a low cr 318 282 hp @ 5000 rpm and 340 tq @ 3500 rpm and wallace calculates to 131 psi 6.75 dcr and 102 V/P far cry from his doomsday 91 V/P example.
At least use realistic specs.
Advertised Intake Duration:250
Advertised Exhaust Duration:260
Intake Duration at .050 Inch Lift:206
Exhaust Duration at .050 Inch Lift:212
Intake Valve Lift:0.432
Exhaust Valve Lift:0.444
Lobe Lift Intake:0.288
Lobe Lift Exhaust:0.296
Lobe Separation:110
Intake Centerline:106
Exhaust Close ATDC:16
Intake Open BTDC:19
Exhaust Open BBDC:64
Intake Close ABDC:51
Tell me which you rather have out of the choices below stock low cr 318 with headers BASE, or xe262h cam and 4bbl and spacer Mod 2?
https://www.motortrend.com/how-to/mopp-0312-318-long-block-bolt-ons/
| HORSEPOWER SUPERFLOW 901 DYNO-TESTED AT WESTECH | | | |
| RPM | BASE | MOD 1 | MOD 2 |
| 2,000 | 112 | | |
| 2,500 | 137 | | |
| 3,000 | 164 | 193 | 192 |
| 3,500 | 182 | 224 | 227 |
| 4,000 | 189 | 248 | 252 |
| 4,500 | 186 | 265 | 274 |
| 5,000 | 179 | 271 | 282 |
| 5,500 | | 262 | 270 |
| TORQUE SUPERFLOW 901 DYNO-TESTED AT WESTECH | | | |
| RPM | BASE | MOD 1 | MOD 2 |
| 2,000 | 292 | | |
| 2,500 | 287 | | |
| 3,000 | 287 | 338 | 336 |
| 3,500 | 272 | 335 | 340 |
| 4,000 | 248 | 326 | 330 |
| 4500 | 218 | 309 | 319 |
| 5,000 | 188 | 285 | 296 |
| 5,500 | | 250 | 258 |
Advertised Intake Duration:262
Advertised Exhaust Duration:270
Intake Duration at .050 Inch Lift:218
Exhaust Duration at .050 Inch Lift:224
Intake Valve Lift:0.462
Exhaust Valve Lift:0.47
Lobe Lift Intake:0.308
Lobe Lift Exhaust:0.313
Lobe Separation:110
Intake Centerline:106
Exhaust Close ATDC:21
Intake Open BTDC:25
Exhaust Open BBDC:69
Intake Close ABDC:57