[ponjohn]

KRE just dyo'd pump gas 505 with 365cfm high ports. 676 hp at 6000 rpm.

[Stan Weiss]

Originally Posted by ponjohn

KRE just dyo'd pump gas 505 with 365cfm high ports. 676 hp at 6000 rpm.

Very nice numbers. Anymore information like CR or cam specs given?

Stan

[Steve C.]

Anymore information like CR or cam specs given?

Good luck ! Typically they are Secret Squirrels regarding cam specs.


.

[Stan Weiss]

Originally Posted by Steve C.

Anymore information like CR or cam specs given?

Good luck ! Typically they are Secret Squirrels regarding cam specs.


.

Steve,
Thanks.

I was just looking to see how close or far away it was from something I had simulated in Desktop Dyno.

Stan

[Stan Weiss]

510 ci
650 HP @ 5900
11:1 CR
93 octane

https://www.motortrend.com/how-to/51...ech-dyno-test/

Stan

[PAUL K]

Maybe we're doing chit wrong but we made 735 on pump gas with a factory block recently. Another Pontiac builder was North of 900 with pump gas and an aftermarket block. Both builds used Hi-ports.

That Motortend build is 20 HP stronger than a members 455 aluminum D-port factory block build using a similar spec standard core camshaft but he was 46 CID less.

I would think maybe our Dyno was happy but all three engines were pulled on different dyno's.


FWIW

[Stan Weiss]

Originally Posted by PAUL K

Maybe we're doing chit wrong but we made 735 on pump gas with a factory block recently. Another Pontiac builder was North of 900 with pump gas and an aftermarket block. Both builds used Hi-ports.

That Motortend build is 20 HP stronger than a members 455 aluminum D-port factory block build using a similar spec standard core camshaft but he was 46 CID less.

I would think maybe our Dyno was happy but all three engines were pulled on different dyno's.


FWIW

Paul,
You were using a 115 LSA?

Stan

[PAUL K]

Originally Posted by Stan Weiss

Paul,
You were using a 115 LSA?

Stan

Hi Stan.... No, we use the wide LSA's like that for 1,000+ NA builds and some forced induction combinations. We also used a lot less lift. Duration at .050 was about the same..... So maybe we weren't as similar as I initially thought.

That's a pretty exotic build (the Motortrend). I'm guessing it went into a big dollar pro touring type car.... Probably idles really well.

[Steve C.]

Paul's comment regarding engines being pulled on different dyno's is very appropriate. Dyno results can vary all over the map.
Much depends on both the facility involved and also the operator.

From the internet...
Westech has an optimized, sealed dyno cell with blow-through fans (you can barely open the cell doors with them on), plus strictly controlled coolant and oil temps.
Typically Westech's engine dyno runs start at a 140-degree F coolant temp and (at worst) end with the temp no higher than 160 degrees.
Great for generating accurate and repeatable numbers (Westech routinely recalibrates its dyno)


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[Steve C.]

Pump-gas 535ci, 650hp at 5400 rpm
345 cfm Edelbrock heads
Torker II intake with Quick Fuel 850 carburetor
Relatively mild 248/254 XE hydraulic roller

https://www.motortrend.com/how-to/cc...-alloy-indian/


The Westech dyno wouldn't hold the engine under 3000 rpm.
At its lowest point on the readout it was already producing 600 ft.lbs. torque. Flat torque curve.
Also keep in mind here, if you were to use a solid roller cam it would have more duration than the hydraulic roller profile.
If you want the valve lift curve to be the same, the solid (Mechanical) lifter cam will be bigger at .050".



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[ponjohn]

Originally Posted by PAUL K

Maybe we're doing chit wrong but we made 735 on pump gas with a factory block recently. Another Pontiac builder was North of 900 with pump gas and an aftermarket block. Both builds used Hi-ports.

That Motortend build is 20 HP stronger than a members 455 aluminum D-port factory block build using a similar spec standard core camshaft but he was 46 CID less.

I would think maybe our Dyno was happy but all three engines were pulled on different dyno's.


FWIW

Did you port the Hi-Ports?

[PAUL K]

Originally Posted by ponjohn

Did you port the Hi-Ports?

Hi John, the pump gas heads I did.

[Dragncar]

Originally Posted by ponjohn

KRE just dyo'd pump gas 505 with 365cfm high ports. 676 hp at 6000 rpm.

If I had a 505 with heads that flow just about like a set of Wide Ports and only make 676 I would not be happy.
Maybe the cam was not all that big ?

[PAUL K]

Originally Posted by PAUL K

Maybe we're doing chit wrong but we made 735 on pump gas with a factory block recently. Another Pontiac builder was North of 900 with pump gas and an aftermarket block. Both builds used Hi-ports.

That Motortend build is 20 HP stronger than a members 455 aluminum D-port factory block build using a similar spec standard core camshaft but he was 46 CID less.

I would think maybe our Dyno was happy but all three engines were pulled on different dyno's.


FWIW

Originally Posted by ponjohn

Did you port the Hi-Ports?

Originally Posted by PAUL K

Hi John, the pump gas heads I did.

Just to be clear, I ported the D-port aluminum heads on the 630 HP 455 build and the 735 hp Hi-port head on the factory block build. The 900 plus Hi-port engine is a pump gas build also built by another shop.

[HWYSTR455]

I'd be interested in knowing the general cam specs on the 735 & 900hp builds.



.

[PAUL K]

265'ish @ .050 on the small build and no info on the other it was not my project.

[Formulajones]

That sounds more like it for a 455 cam.

Dad's in the 571 is only 261 and that 598 I bought is only 258!
Both on a 112 and both hydraulic rollers.