Does this sound right

[273]

The heads have just as much to do with peak rpm potential as camshaft, I'd even say more so.

 

[MOPARMAGA]

set this to the Tom Jones song

Lol

 

[Heywodja]

Is that Canadian HP or US? I wonder what the conversion rate is.

 

[9secRR]

my 436'' W2 peaked at 6900. i'll try to find some dyno sheets.

 

[fishmens67]

Some run out of breath before it runs out of cam.
and some run out of cam before it runs out of breath.

 

[fishmens67]

The heads have just as much to do with peak rpm potential as camshaft, I'd even say more so.

and I'd say the intake as well.

 

[RAMM]

The heads have just as much to do with peak rpm potential as camshaft, I'd even say more so.

IME it is the cross section AND the shape that dictate 90% of where peak power occurs. The other 10% are camshaft AND exhaust in conjunction with each other. I've seen an NA 1st Gen Hemi with a cam and only 220 @ .050" peak at 6700 RPM. J.Rob

 

[bigfoot]

Takes less cam to make horsepower and turn rpms with properly sized ports and intake for the respective cubic inches.

 

[MOPARMAGA]

Great, thread. I've learned something.

 

[fishmens67]

Great, thread. I've learned something.

I didn't get all scientific, but yea. lol

Some run out of breath before it runs out of cam.
and some run out of cam before it runs out of breath.

 

[MOPARMAGA]

I didn't get all scientific, but yea. lol

Yeah, that made sense to me

 

[PRH]

Thru the years, I’ve tested a few combos that surprised me in terms of where the peaks occurred.

Some higher than expected……..some lower.

 

[m79ded]

no worries.
I had a few engines tested by a shop in Quebec in the 90’s.
Just curious if it was the same one.

That being said, .88 vapor pressure would be super high in that part of the world.
I’ve never seen it all that close to .88 here.

Was that tested recently?
Nicks Garage is up there too.
But that sheet is from a dyno that uses the old DOS software, and Nicks has had the WinDyn software for a few years now.

Looks like Jacques Genest's old Dyno, We used to go there with Ray Barton all the time back in the 90's

 

[RAMM]

Looks like Jacques Genest's old Dyno, We used to go there with Ray Barton all the time back in the 90's

Hey T.M.! Where did his old dyno go? Tested there many times from 1995-2003 ish. Definitely learned a few things every trip. J.Rob

 

[B3422w5]

Possible.

428 X with a 686 lift Batten heads carb 950 peak power was at 7200
416 R with a 686 lift with indy heads carb 1050 peak power was 7900

The cam only plays a partial part of peak power.

I Get that Indy heads are obviously bigger than an Edelbrock head, etc.
And that they will move the power band up. I also get that the cam is far from the only dictator of where max power is. But it is a factor.
My point was, the small cam is going to act as a governor to where peak power will get made.
6800 just seemed higher to me than I would have thought. Indy head or not

 

[BVoelzke]

I Get that Indy heads are obviously bigger than an Edelbrock head, etc.
And that they will move the power band up. I also get that the cam is far from the only dictator of where max power is. But it is a factor.
My point was, the small cam is going to act as a governor to where peak power will get made.
6800 just si eemed higher to me than I would have thought. Indy head or not

Just an fyi I had two small block stroker motors : the first was a R3 block at 408 c.i. with pretty much out of the box Indy heads , a 590 lift mechanical cam at 9.8 to 1 compression it made 502 tq and 527 hp and peak tq and hp was around 6400 , I sold it when the crank cracked. my second and current 410 c.i. 360 Magnum block 9.5 to 1 compression , ancient W2 heads and Victor W2 intake , 585/595 lift cam made 520 tq and 547 hp again peak tq and hp were around 6400