basically, going with the philosophy of



low deck 451
M1 single plane intake (swap to performer RPM if the single plane is annoying)
cam like a mopar 528 solid ie. ~240@050" - 112LSA
1-7/8 headers
can make a piston choice to have the motor be roughly 10.4:1 with either heads

go with the smaller port heads and save some money, go with the trick flow with bigger ports and better flow...for a hot street motor, that will see the strip occasionally.

gain much torque down low with the RPM heads? gain much power up top with the PP240, maybe still have as much torque down low??

I’m sure there would be a difference....... how much? Only way to know is do the test.

When the TF 240’s came out, on their 600hp test mule I thought they said their heads were better than the RPM’s by 30hp.
That was ootb heads, on a motor that made 85hp more than the one we just ran.
This one had very mildly reworked heads, and less hp/ci....... so I’d expect the gap to be lower than 30hp....... but that’s pure speculation.

It wouldn’t surprise me if you did the test on a bigger cube motor with a bigger more aggressive cam that you could get the difference between ootb RPM’s and ootb TF240’s to be over 50hp.
Then, on an 8.5:1 383 with a stock replacement magnum cam and an old dp4b with a 600vs carb, there might not be any difference.

The motor that was on the dyno yesterday was something I originally built in 2004, that had a problem with one lifter bore.
The lifter bore was repaired, the heads freshened up, solid cam out, hyd roller in.

The heads on it flow 290/217@.600.

Had it been built from scratch today, it might have gotten different heads.

My pump gas small block dynoed 662 hp at 394 ci. That is 1.68 hp per ci. It was dynoed on super unleaded.
I have never ran anything but super unleaded in it. I have thought about running 110 in it and raising the timing to where Brett told me to put it. I don't trust the pump gas enough to raise it. It is raced with the Drag Radials and mufflers just like it is street driven.

Put some gas and timing in that thing and turn it loose!

Every SB I've mess with didn't like more than 33 total timing regardless of compression or fuel used
But if you don't test at the track you'll never learn what YOUR motors really wants and likes

The engine I built this year for my Coronet is probably the best street engine that I've tested so far. It is 496 inches with TF 240 heads, a small hyd roller cam, compression in the high 9's for pump gas and small tube headers. It made a little over 600 hp and 600 torque.

The cnc ported Stealth heads on my 505 flow almost identical to the TF 240's.

I'm really enjoying this combo with the mild hydraulic roller, 10.3:1 CR, 11" converter and 3.54 gears.

I drive it to work when the weather is nice, cruise it all over, run pump gas and it really requires very little maintenance.

I have well over 6,000 miles on it and it is super consistent! When I run it n/a at the nostalgia events, it runs within 2 hundredths all day long! I have two 1st and one 2nd place finishes this season racing. At one event we were running 104 mph in the 1/8th mile all day on a small shot of nitrous.