People have run in the 9’s with them in SS.

My heap has only been able to muster an 11.18@123 at 3550lbs running unported 906’s, RPM intake and SFT cam.

What are these quicker 383 engines revving to?

Not a real accurate comparison here but the basically factory original, stock stroke 383 with a factory "335 hp" hydraulic cam in my Coronet won't go much beyond 4,500 rpm.

Likely rpm limited by the hydraulic lifters and the way they pump up at that rpm and hold valves off the seat. I have used hydraulic cams that required adjusting them out to .006 using a feeler gauge. That did away with any possibility of pump up.

The cam does not limit RPM, only power. With enough spring you can blow it up.

150.246 mph. But that was at Bonneville in 1959 with a 361 in a '59 Plymouth. Does that count?

Me, personally... 14.0 at 101 MPH in a '69 Super Bee 383 4-speed... back in either '79 or '80. Hey, you asked!

Likely my favorite 383 car ever: Dave Boertman's '71 Challenger SS car. It was a mid-to-high 10-sec car with an "interesting" backstory as described HERE.

There was a fantastic 383ci engine article in an old Mopar book, ''Musclecar and Hi-Po engines''

Chrysler themselves got Victor Edelbrock to do a 'Hotrod' article on a NEW factory 383ci engine in 1967!

They had been hearing of ‘bad press’ for the 335hp ‘383ci’ so 'MOTHER MOPAR' wanted to put the record straight lol.

On the Dyno, a brand new low mileage 383ci made only 280 horses...

So with lots of machine work and the right camshaft, they got it up to 420 horses.

The article does not say which heads were used 516 or 915 (440) heads?

The biggest problem being was 'factory over-tight' clearances.

''Freeing the horsepower'' was just more piston to wall and bearing gaps, worth 100hp...

I think I remember Dave Wren running in the 9.80s back a long time ago with his 1971 Cuda 383 SS/I car in the mid 1970s
If I'm remembering correctly he let the clutch out at 8800 RPM and shifted it around 8200 RPM That motor was a unbored 400 block given to him by the Mopar factory drag engineers that they had built and flogged a bunch on the dyno before giving it to him to race to outrun the 350 Chevy in that class: devil:

What oil pumps were being used for these 7,500+ rpm combos? How loose on the bearings? Presuming these faster times were roller cam/tunnel ram/open header combos with 5K+ 8" converters and 5.xx gears...

Almost forgot that just recently I finished helping my friend build a 383 stroker (438"). It's a pretty mild street cruiser combo. OOTB 440 Source heads, about 9.3:1 C.R., 228/232 @ .050" hydraulic FT cam, RPM intake, headers, 750 carb. Made just under 450 hp and 450+ lb. ft. of torque. It did rev to 6,000 rpm though which is more than I can say for the heap in my own car. Combo is going in a '66 Fury with highway gears and regular tires. Won't be raced but maybe it might go in the 13's on slicks.

383/438 On the dyno For B Bodies Only

You mean 10.80s? The record minimum today is 10.05...

Much as I hate to say it the Chevies had us covered.

Notice the date the records were set.

Just like today, nobody runs as fast as they can or weight is added to your class. The big hitters never ran all out. Chrysler told the A cars to not bomb the record so the little guys in their class have a chance, more cars more publicity.

Most fast cars sandbagged to a point but I don’t recall ever seeing/hearing any Chrysler product run a second under the record.

I know of a few Chrysler products that won class by running out the backdoor and ended up bombing the record, but no where did they run more than a tenth or two under.

Was directly involved in all the Chrysler “activities” from around 67 to 80. Pretty much knew what cars were sandbagging and which ones were bogus.
Some “heroes” won SS back in the day that should have been tossed but even they didn’t run a second under the record either.

And the other thing to use as a benchmark. A similar car in a differentiations Eliminator like MP.
1975 - A/MP 68 Dart at 426 @ 3400 lbs. Tunnel ram, ported aluminum heads, ran 9.45 @ 145-148 mph.
How would a SS legal SS/A car go that fast the same year with “legal” heads and a crossram.?