[Steve C.]

"Would you trust the flow numbers of a flow bench that costs a few thousand dollars or a bench that costs over a million dollars."

Or one where they forgot to subtract out the "dead mouse" factor in the laminar element ..... Bwahahhaha. Some here might remember and understand

Sometimes it's not the intake manifold that is the restriction
Sometimes its the cylinder head flow
Sometimes it's the camshaft profile
Sometimes it's the carburetor
Sometimes it's the exhaust system (i.e. header tube size, collector, exhaust pipe size, muffler type and size

Somewhat mirrors what AFR states......

There are some caveats involved. Actually reaching the predicted power level requires the engine to have the right compression, the right cam, a tuned exhaust, and a nonrestrictive carb and intake manifold. The combined lift generated by the cam lobe and rocker arm should equal the observed lift on the flow bench needed to achieve the desired intake port flow, plus a good exhaust port flow. Etc, etc.


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[slowbird]

Great info as always Steve C!

[ta man]

Originally Posted by GOAT8U2

I'll have a thread soon on the 1" spacer, before and after, dyno power on my Ported T2 to add some value to this.

With the Mustang Dyno it's currently using, it looks like auto transmissions range from 20-25% depending on converter slippage etc. We used fuel consumption etc to get more detail on real power at the engine to balance it out. My GN saw 416rwhp but the fuel calculations said 520hp, that's a 25% loss.

It will be a good real test. I know from my testing a few years ago with my car it picked up about 2mph 2 tenths with a one inch spacer. That was back on a 550hp or so 462..it also gave up nothing on the bottom end..60 footed harder. I want to try a 1.5 and a 2 inch this year as well as combinations of open and tapered 4 hole spacers. I'm also searching for a 4150 Victor.

[leeklm]

For another comparison, the combo in my signature was about 585hp at the crank with a port matched (no internal work) T2 and 1" spacer. I have since picked up a couple tenths at the track using a 2" open spacer and having the T2 opened up with some porting. I tested a 2" tapered super sucker spacer last fall but lost ET and MPH.

Sent from my SM-G965U using Tapatalk

[Tandyman]

Originally Posted by ta man

It will be a good real test. I know from my testing a few years ago with my car it picked up about 2mph 2 tenths with a one inch spacer. That was back on a 550hp or so 462..it also gave up nothing on the bottom end..60 footed harder. I want to try a 1.5 and a 2 inch this year as well as combinations of open and tapered 4 hole spacers. I'm also searching for a 4150 Victor.

Ta man , I have a 4150 Victor you can borrow if you like . I am in Holland Landing just north of Newmarket ON .

Glenn

[Skip Fix]

Steve25-You AND Tom are both right it is just a Victor BUT Edelbrock has for EFI it listed as a Super Victor.

I think the big deal will be what the heads airflow/port size is. Randy Allen in another discussion was asking the same except about a Northwind as hood clearance is an issue. His ports are 2.5"! No way a Torker II pass that much air even if you weld the heck out of the port opening to seal. If your High Ports are moderately ported it may not be up to the job.

My 455 in the 78 TA with only a 3/8 spacer on the T2(Shaker Hood)is putting out 550-575hp depending on the calculator-stingy engine Stuska dyno only 525 hp.

[Steve C.]

Not to belabor the point but for interest here to show an example how different benches and results can vary. Two different cylinder heads by the same source.

Stated by the OP regarding his KRE HP heads...

"Even though KRE says it flows 322cfm at .600 another member flowed them and got less, I just chose the most conservative number."

Yesterday I received a related tid bit from a friend using a set of KRE 325s for a customers motor he's building. Like many aftermarket cylinder heads that 325 cfm rating is at .700" lift.
For interest he had them flow tested on a friends bench. On that bench the heads tested 328.5 cfm at .600" lift. Tested at .650" they were 302.6 cfm and went into turbulence.


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[ta man]

Originally Posted by Tandyman

Ta man , I have a 4150 Victor you can borrow if you like . I am in Holland Landing just north of Newmarket ON .

Glenn

Thanks PM sent..you are arent that far away.

[GOAT8U2]

Started a new thread on the 1" spacer results, wow.

1" Spacer Dyno Results, EFI, Torker 2 and High Ports.