Aluminum heads

[TT5.9mag]

You simply don’t have the full story to be making claims or conclusions.

Peaking at 5400 is probably correct for that size cam. Cam details matter.

Maybe the valve train was giving it up.

You sound smug. I hope that’s not your intent. I was making NO claims and coming to NO conclusions. I simply posted about an engine I saw run on the dyno and I gave my opinion based on seeing (seriously) hundreds of engines go across that exact same dyno, many of my own engines included. I know what it looks like in a graph when a valvetrain goes unstable, this was not that. The engine happily went to 6000 and would have gone more. Peaking at ~5400 or so, I though was correct for that size cam in that many cubic inches and I said that many times, so I don’t know why you felt like you had to reiterate that. Read the rest of the thread, I said the same thing a few times.

 

[TT5.9mag]

Ill be seeing another out of the box set of 240s on the Dyno soon
Single carb, 11.5:1 272-278 solid flat tappet

Keep us posted. Tell Tim it’s time to come back and bust some balls.

 

[TT5.9mag]

I’ll say it this way, if I took that 512 and upped the CR to be equal to the 470, and added the 260@.050 SFT cam……..it wouldn’t peak at 5400 anymore.

Agree. And definitely what needed to be done to get it out of “tractor” mode.

 

[MOPARMAGA]

Did you ever test your 470 with a single carb?
If so, what carb/intake, and what did it make?

The best it did was 620s, 850 blp annular boosters. Track heat unported. That was with the hooker fenderwell headers too

 

[TT5.9mag]

The best it did was 620s, 850 blp annular boosters. Track heat unported. That was with the hooker fenderwell headers too

What RPM?

 

[MOPARMAGA]

What RPM?

4300 tq - 5400 hp. I gotta see if I can find those Dyno sheets, I remember being pretty disappointed

 

[PRH]

That was with the hooker fenderwell headers too

1-7/8” or 2”?

 

[MOPARMAGA]

1-7/8” or 2”?

2

 

[MOPARMAGA]

1-7/8” or 2”?

I forgot to mention I'm going to let the guy test with my 2.125 tti headers to see what gains it will have over some other under chassis headers

 

[MOPARMAGA]

-512 is 9% bigger using same sized heads
-pump gas compression
-single carb vs TR w-dual 4bbl
-231@.050 HR vs 260@.050 SFT

And……tested on different dynos.

I’ll say it this way, if I took that 512 and upped the CR to be equal to the 470, and added the 260@.050 SFT cam……..it wouldn’t peak at 5400 anymore.

Definitely

 

[PRH]

I can’t think of any BBM combo I’ve tested that had decent heads and a cam at least in the mid-250’s that peaked as low as 5400.

505, 11:1, prepped RPM heads, 252/260 SFT, 6bbl, dyno headers.
Highest TQ number at 4300/highest hp number at 5800, but it’s hardly a “peak”, since it’s within 10hp from 5100 thru 6100.

The other side of the coin:
505, 9.8cr, prepped RPM’s, 232/237, .483/.483HFT, original Torker(no mods), 850VS, 1-7/8 x 3 headers.
Peak TQ at 4000/peak hp at 5100, and then it drops pretty quickly.
The Torker and small cam are the big corks in that combo.

 

[TT5.9mag]

I can’t think of any BBM combo I’ve tested that had decent heads and a cam at least in the mid-250’s that peaked as low as 5400.

505, 11:1, prepped RPM heads, 252/260 SFT, 6bbl, dyno headers.
Highest TQ number at 4300/highest hp number at 5800, but it’s hardly a “peak”, since it’s within 10hp from 5100 thru 6100.

The other side of the coin:
505, 9.8cr, prepped RPM’s, 232/237, .483/.483HFT, original Torker(no mods), 850VS, 1-7/8 x 3 headers.
Peak TQ at 4000/peak hp at 5100, and then it drops pretty quickly.
The Torker and small cam are the big corks in that combo.

How does a “prepped RPM” stack up next to a 240? Or a 270?

 

[PRH]

Prepped RPM’s are basically a “stage 1” type job along with getting the seats recut.
About 290@.600 for the RPM, 315 for the TF240.
Plus the TF has a better chamber and a bigger intake valve.

On my bench a 270 is like 345@.600.
But that’s a MW sized port.

I’m confident the ootb 240’s would outpower the prepped RPM ‘s on a typical hot street/bracket race stroker.

 

[BSB67]

508. 10.8:1, Prepped RPM, 248/252 cam
Small Venturi 950 Holley (1.375) on Indy 2D.

highest peak torque @ 4400 rpm. Highest peak power @ 5800. But like PRH, so flat across the top, peak hp showed up at every increment from 5300 to 6000 over the 30 pulls.

 

[cookietruck]

Are all these combos using a 6.76” rod?

Edit. Just looked at 440 source, alot of low deck 4.25” combos can use a 6.535” rod.
And RB can use a 7.1” rod…

 

[3404spdfish]

Cam and crank pictures. I fell into these parts by chance all new cheap as dirt so I had buy them now I am going to use them

 

[BSB67]

I thought you had a 400 block. If so, you’ll need to turn down the mains.

 

[TT5.9mag]

That cam won’t make peak HP at 5400.

 

[Ricks70Duster340]

Cam and crank pictures. I fell into these parts by chance all new cheap as dirt so I had buy them now I am going to use them

View attachment 1716425828

View attachment 1716425829

That's a mighty stout cam! Engine probably will idle like a thrashing machine!

 

[PRH]

That cam won’t peak at 5400.

If it had good enough heads, might make peak TQ around there.

 

[TT5.9mag]

If it had good enough heads, might make peak TQ around there.

I had to go back and add to my post.

 

[3404spdfish]

Good thing cam was free, I do have 400

 

[PRH]

Based on the number stamped into the crank(4404150), I’d think it was a 4.150 stroke crank to use in a 440 block.

Maybe it’s already had the main journals and counterweights cut down for use in a 400 block?