Poly Stroker on the Chassis Dyno

[threewood]

That's awesome, congrats! I have stock stroke poly 4 bbl that I enjoy driving.

 

[hacksaw]

I took my car to the tuning guy today and he put it on the chassis dyno to optimize it and see the difference between the 600 v/s Holley and the 700cfm Double Pumper I also have.

It's a 354 poly, 727 and made 341hp at the wheels with the 700 cfm and 334hp at the wheels with the 600. It was a filthy hot day, 90° by 11am and nearly 100° by lunchtime.

He was very impressed - said it was a really stout engine, the factory 4 barrel manifold is holding it back in his opinion. He didn't really make many changes as it was running great as it was. I was happy with the result but also a little bit disappointed as I was hoping he would find some magic horsepower gain.

For reference the stock 428 Cobra Jet Mustang he ran on there earlier this morning made 290hp. That was an auto too.

I was surprised the power started tailing off by 4,500rpm, I'll have to ask him about that, maybe needs a bigger cam?
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id be happy as all get out with that ... even with the solid fan sucking 40-ish HP from ya...

I took my car to the tuning guy today and he put it on the chassis dyno to optimize it and see the difference between the 600 v/s Holley and the 700cfm Double Pumper I also have.

It's a 354 poly, 727 and made 341hp at the wheels with the 700 cfm and 334hp at the wheels with the 600. It was a filthy hot day, 90° by 11am and nearly 100° by lunchtime.

He was very impressed - said it was a really stout engine, the factory 4 barrel manifold is holding it back in his opinion. He didn't really make many changes as it was running great as it was. I was happy with the result but also a little bit disappointed as I was hoping he would find some magic horsepower gain.

For reference the stock 428 Cobra Jet Mustang he ran on there earlier this morning made 290hp. That was an auto too.

I was surprised the power started tailing off by 4,500rpm, I'll have to ask him about that, maybe needs a bigger cam?
View attachment 1528113View attachment 1528114View attachment 1528116View attachment 1528117View attachment 1528118

what size pipes ya running after the header??

 

[66 Sat]

2.5" from the collector back.

 

[66 Sat]

The cam is small, but likely a good match for the intake.

Can you share the rest of the cam specs (LSA, ICL, exhaust) and your lash settings.

Schneider Racing Cams 264F Poly Solid Lifter Camshaft

. This is a high quality cast camshaft that has been precision machined to the following specifications: Part Number: 14227 Grind Number: 264F Intake Duration (gross): 264 Exhaust Duration (gross): 264 Intake Duration (.050”): 220 Exhaust Duration (.050”): 220 Intake Valve Lift*: .450" Exhaust Valve Lift*: .450" Lobe Separation: 110 Intake Valve Lash: .014" Exhaust Valve Lash: .014" RPM Range: 2000-6000 *Based on 1.5 Rocker Arm Ratio

 

[polyjohn]

Great numbers from a 360ci Poly indeed!
Yes you could have done a 440 build, but that's so 20th century...

In the real world of drivable Mopars this sounds 'BANG-ON'!
The cam looks very much like a 340 hipo spec so all good for the street.

We have a 402ci Poly going into a 66 Coronet this year.
It was in a 65 Fury, but that's now getting err a 440...(452ci).

It was the World famous Gary Pavlovich that put straight with our Poly.
4inches x 4inches is the future of SB Mopars lol...

It had a 0.490 camshaft and no we have a trick Schneider camshaft at 0.525 lift 290 duration...

 

[polyjohn]

Oh yes I forgot to say that was with an older Wieand single plane intake.
We are gonna go the Hinkles route and make an LSX intake fit