Eagle has got big stroker cranks for 360 / 5.9!

[Icetech]

I sure would not worry about TF heads being too big for a 408.
I've got 20 year old sbc heads that flow more, on a 350.

naw, wasn't worried bout them being too big, was just more of a curiosity.. I mainly got them cause looking at the stock combustion chamber made me sad inside, and if i was gonna spend the money, might as well spend it..

 

[273]

So.. i am curious.. for a street car that wants a nice power curve and not max rpm/hp how much do smaller heads hold you back below like 6000rpm?

Cid would play a huge role

i'm talking like 280@.500 vs. 310ish@.500?

Somewhat hard to say, If the 280 had the right port volume and shape to turn the Cid and make power at 6000 rpms but the 310 didn't than the 310 would peak lower in rpm and probably hp.

But let's say the 310 turned more rpm and made more peak power probably would make more power at lower rpms too, just a narrowed gain to even a slight loss as rpm goes down.

Does the extra flow come more into play at a higher rpm?

The air flow demand is gonna go up as rpm does, 6000 rpms needs about twice as much airflow as 3000 rpms, above peak torque your engines VE% (ability to fill cylinders goes down as rpms rises) so less torque, why hp still goes up after peak torque is cause of the multiplying effect of rpm, hp % of torque. About 1000-2000 rpm higher than peak torque, torque drops off enough around 90% of peak torque where the drop off is faster than the rise of the multiplying effect of rpm. Eg.. Hp is 100% of torque at 5252 rpm and 125% at 6565 rpm.

So above peak torque your engine finds it harder and harder to fill the cylinders.

 

[Demonx2]

you guys are nuts.. i just want a nice happy mid 11 street car

With TF heads, you will have at least that. I keep preaching that my little Eddy-headed (pic below) 408 with a somewhat limited SFT cam (251/255@050 but using milder "Ford" lifter dia lobes) has run 11.0x's at a pinch under 120 mph. You've got way more cyl head so cam and torque converter it appropriately and wallah...11 secs are easy peasy. And the torque of the 408 will make you grin from ear to ear! All day long!

Now if you want to run 10's, you also have the heads to do that too. Pick your supporting parts and enjoy that as well.

 

[Icetech]

With TF heads, you will have at least that. I keep preaching that my little Eddy-headed (pic below) 408 with a somewhat limited SFT cam (251/255@050 but using milder "Ford" lifter dia lobes) has run 11.0x's at a pinch under 120 mph. You've got way more cyl head so cam and torque converter it appropriately and wallah...11 secs are easy peasy. And the torque of the 408 will make you grin from ear to ear! All day long!

Now if you want to run 10's, you also have the heads to do that too. Pick your supporting parts and enjoy that as well.
View attachment 1716465126

I have a 3200 and a 3800 converter here (3200 in the car right now) the 318 with tfs is OK to get around.. i can't wait to get the new motor done

Also 4.30s which are starting to annoy me...

 

[PRH]

I haven’t built anything with TF 190 heads, however I’m quite confident I could put something together that would easily make 525-550 pump gas friendly horsepower, and not feel like it was totally out of breath at 62-6500rpm.

But it might not be great with 3.23’s and an 11” converter.

 

[Icetech]

I haven’t built anything with TF 190 heads, however I’m quite confident I could put something together that would easily make 525-550 pump gas friendly horsepower, and not feel like it was totally out of breath at 6200rpm.

But it might not be great with 3.23’s and an 11” converter.

Terry Brighton has done quite a few on his channel. and shows dynos, usually mid 500s without too crazy of a cam. I was just more wondering bout how critical port flow is below X rpm.. bored at work and all

The weeks almost done at least

 

[Newbomb Turk]

I haven’t built anything with TF 190 heads, however I’m quite confident I could put something together that would easily make 525-550 pump gas friendly horsepower, and not feel like it was totally out of breath at 62-6500rpm.

But it might not be great with 3.23’s and an 11” converter.

At what displacement? Much over 400 inches and getting peak power much past 6k takes what most consider a HUGE cam.

 

[PRH]

As for the longer than 4.00” cranks…… there was a 440” SB build racing in FAST several years ago, that I believe was the quickest SB car in the series for a while.
It was a red Duster that ran J heads i ported along with a SR cam I supplied.
It was in the low 11’s…….back when that was pretty good for one of those.

I think the car ended up sold and being shipped to somewhere in Europe…….Sweden maybe?

 

[Icetech]

As for the longer than 4.00” cranks…… there was a 440” SB build racing in FAST several years ago, that I believe was the quickest SB car in the series for a while.
It was a red Duster that ran J heads i ported along with a SR cam I supplied.
It was in the low 11’s…….back when that was pretty good for one of those.

I think the car ended up sold and being shipped to somewhere in Europe…….Sweden maybe?

that's 4.25x4.040?

 

[PRH]

At what displacement? Much over 400 inches and getting peak power much past 6k takes what most consider a HUGE cam.

4” stroke, so like a 408.
It doesn’t need to make peak past 6000 to not “nose over” before say 62-6500.

Pump gas 410, 270cfm Ede’s, 251/259 cam, peaked at 5900…….still with 10hp of peak at 6400.

 

[PRH]

that's 4.25x4.040?

4.060 x 4.250

 

[PRH]

Imo, The single biggest advantage the TF’s have in an application like mentioned above, over one of the Ede variants is…….the fact that the roller spring version comes equipped with springs that will accommodate .700” lift.

I sold a cam(mid-260’s) to someone who put together a 408 with TF heads and a ported SV.
Dynoed it on E85……..made peak power at 6500. Just under 600hp.

 

[9secRR]

That was in his next car, the Silvaliant. He went overboard with the lightest parts he could, and the 501 didn't last long.
Other than his late model Challenger stuff, I was most impressed with his 71 demon. Silvaliant was drop dead gorgeous, and even fairly fast with the crate 360 that it got after the 501 got hurt.

wonder if anyone got the 501'' off of him when he gave up on it?

 

[PRH]

I remember when that 501” deal was going on…….it was quite a saga.
Too bad it never really played out as hoped.
It was a good read though.

 

[PRH]

I was just more wondering bout how critical port flow is below X rpm

My best advice to that is…….don’t overthink it.
Find a straightforward combo that someone built and tested, that would satisfy your needs…….and duplicate it.
Easy Peasy.

 

[TT5.9mag]

And there's people that would add twin turbos to that, like I said it all depends what you want.

You rang?

 

[273]

Terry Brighton has done quite a few on his channel. and shows dynos, usually mid 500s without too crazy of a cam. I was just more wondering bout how critical port flow is below X rpm.. bored at work and all

The weeks almost done at least

It’s an hard question to answer too many variables, it’s more about port size and shape than flow, plus VE% has a lot to do with it a 408 at 100% vs 120% ve is basically a 408 vs 489.

 

[TT5.9mag]

Yah, but then there's always those guys running 408s that want 500hp at 3850 rpm, and on up from there. Because ?

View attachment 1716465049

Centrifugal supercharged? That’s what that graph looks like to me. Rising boost curve.

 

[33IMP]

wonder if anyone got the 501'' off of him when he gave up on it?

Unfortunately I don't know what became of it, or how hurt. I know where silvaliant went, who has it, and what it runs now. (Not-really tuned properly, Mopar crate 360 in it)
Still damn pretty tho.

 

[Icetech]

 

[Icetech]

Found his moparts build thread..

 

[33IMP]

I could happily eat off the underside of his stuff. Unbelievably clean for a street driven race car. And the engineering? Ron is a retired Homer Simpson, only very, very smart.

 

[Icetech]

I could happily eat off the underside of his stuff. Unbelievably clean for a street driven race car. And the engineering? Ron is a retired Homer Simpson, only very, very smart.

jesus man... that motor... he had soo much thought and planning into it.. and the money.. Bryant crank even...

 

[33IMP]

you guys are nuts.. i just want a nice happy mid 11 street car

 

[Icetech]

View attachment 1716465164

well hello there that scoop doesn't look bad on there