I don't know if its the the nature of the 6 pack or just a coincidence, but no matter what I run it on, I'll start with 65 center and 80's outsides. Then when I'm all done I'm usually exactly what you describe, 64/65, and 77/82, and does not seem to matter much if its a 350 hp or 550 hp deal.

Itll all be different when the lid goes on top of the carbs .
. Might be able to jet down
And itll all be different when on the street
We were tuning to get rid of the slight lean at about
3500-4500 when the outboards kicked in .
The fuel urve evened right out . With thicker springs
and fatter jets.
It might be way off for the road ..

We had perfect air
O89 and 91 resemble stock plates
Started there ..
77/82 seems small ..

My pump gas six pack 511 C.I. low deck stroker motor liked .094 fuel inlet size on the driver side outboard plates with .096 on the driver side of the Eddy aluminum dual plane six pack intake using a set of OEM 1970 440 California automatic carbs. modded by C&J Engr. in Whitter, CA
I don't remember those List numbers now though
I had that motor on two different engine dynos and it made peak HP at either 5500 RPM or 5600 RPM with peak torque at 4500 or 4600 RPM . I tested three different sets of carbs on the first test session, That set of modified 1970 carbs., a new set of OEM 1971 440 replacement carbs and a set of the original mechanical carbs as well as several different air cleaner elements as well as stacking two elements on top of each other.
That motor made the most HP and torque with the air cleaner base on and no air cleaner element with the mechanical carbs. There was only 7 HP differences between all three sets of carbs though

Wow, great info you guys! This was back in the day before the non-stick gaskets, nylon bowl washers and widebands too, right?

The Holley jets are not super accurate either. Does anyone make blueprinted Holley jets that actually match the flow of the number stamped on them?

I don't have a heat crossover in my Indy's, have insulating mat between the intake manifold and valley pan and run a Shaker hood. The carbs are still super sensitive to air temperature and heat soak. I can feel significant power loss as heat saturates the intake from heat soak.

I wonder if the same power loss would occur with multi-point EFI?

Do mind sharing the cam card? That’s a bad dude!

No sense of hiding it
Hopefully it can get some critique here
But its tough to compare to a reg solid cam spec
due to the roller part of it . I think - i dont know much about
reading split cam cards and All of the logic behind
it .. and ill effects of this and that .. I guess well just call it the FM cam.
Dont know how , but it works .. lol.

Hopeful its nice on street - it sure idles like
my old bobk cam.



I only got 10-12” of vacuum
But i wasnt tuning for vacuum yet ..

Hopeful i can get it higher with a couple screws .
Some more tweaking coming
I got an H pipe and factory manifolds mounted
On Dyno last night ..

Figures the h pipe was contorted
Needed a bunch of fat guys and a bigass pipe to
twist the collector flange into position ..

But moving along
Will be bad air tonight

Looks like your cam guy has done this before.

It wasnt summit tech support thats for sure
I think the builders had some input , and seem to have a good
relationship with comp.
Even though theyre Not normally MP guys, lol , theyre anal as
heck and have a couple beefy mopars under
their belt . Everything they touch seems to sing pretty well.

Why can I not see a cam card, just see a "empty frame"?

Well it worked pretty good with the Headers but did not like the cast manifolds and 2 1/2 inch exhaust

works fine for me.

Well how bad was it?

Some more tuning could have been had , but three jet
Sizes later , two different sets of mufflers and ..........

We jetted all the way down to 81/83’s and 64’s on center

We lost about 90 hp .. from headers to manifolds And
2 1/2” exhaust with h pipe ..

And .......





We gained torque and about 10 hp with big a12 air cleaner and kn air filter

Since we have trickflows
The car is gonna go together with headers

It will not even try to appear stock
And thats ok ..

I was the assistant

20 HP by adding the air breather
The engine did not like the ex manifolds at all

Yes it's a trade off for certain. But 550-570 is nothing to sneeze at. Anything faster than a 11.50 requires a roll bar. I think a drive anywhere stock appearing automatic a12 with a 3.54 gear that would run 11.50's through the mufflers would be awesome.

Sounds like the headers are an extremely cost effective power upgrade on that combo.



They never do.
Some just dislike them more than others.

650hp in a 4000lb car should be able to run 10.60’s at 124+.

That's awesome power from a relatively mild combination. I just picked up some Tricklow 240s myself so it's cool to see how much power they are capable of. Hard to not use headers when there is that much power left on the table without them...

Curious if different six packs base plates would create different result

Guess were doin it again with headers and hemi muffs .
And baseblate / air cleaner . And black springs
Lookin for 690 ...
still cant believe we gained with Baseplate . Lol