It would be nice to know the engine specifics, true static compression ratio, headers or stock iron manifolds, intake used and if it was ported, etc, etc, etc?
Peak torque is good for the combination of parts, and is occuring EXACTLY where it has with every XE274 cammed 455 dyno test I've seen, which is about 400rpm earlier in the rpm range than either the Crower 60919 cam or our "custom" HR cam of similiar specs.
What was the torque number at 4900rpm's?
Same thing with peak HP, 4900 is EXACTLY where every single 455 quit that used that cam, even with very good flowing heads on them.
FWIW, we built a stock 455 SD engine here couple of years ago. No grinder or sanding roll touched anything. It was zero decked, and aftermarket forged rods and pistons were used, but the owner insisted on all stock components otherwise without any "mods".
We were able to convince them to upgrade to a small HR camshaft, which I chose from Comp Cams. 230/242/112 with .361" lobes. That engine cranked out over 440hp and 550ft lbs torque. Peak HP at 5400rpms, and peak torque at 3900rpm's.....FWIW.....Cliff
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https://cliffshighperformance.com/
73 Ventura, SOLD 455, 3740lbs, 11.30's at 120mph, 1977 Pontiac Q-jet, HO intake, HEI, 10" converter, 3.42 gears, DOT's, 7.20's at 96mph and still WAY under the roll bar rule. Best ET to date 7.18 at 97MPH (1/8th mile),
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