Cliff, What cam are you currently running in your 455 combo?
The current engine uses SD's "Old Faithful" cam with 1.65 rockers on it. It's on a 112 LSA with the ICL at 109.5. Idles nearly dead smooth with 13.5 vacuum at 750rpms. Excellent street manners.
My first 455 had 6X-4 iron heads and Crower 60919 cam, Rhoads lifters and high ratio rockers on it. It made great power and excellent street manners as well, 12" vacuum at 700-750 rpm's, strong off idle power and ran as quick as 12.0's at 112MPH at the track. Later on I added KRE heads for the KRE dyno head testing that made HPP and Popular Hot Roddings "Engine Masters" articles. A few years later I did some cam testing and replaced the Crower 60919 with a custom ground hydraulic roller cam with 230/242/112 specs. It was worth 3hp/4ft lbs torque for the $1000 investment. It does show us that you can mimic the power of a well chosen roller cam with a flat cam using Rhoads lifters and high ratio rocker arms.
I did run a bit quicker at the track with the HR cam, best ever with the flat cam was 11.64. I went 11.52 with the HR cam and almost 2mph faster........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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