Odd '163 intake

[nuch_ss396]

Hey guys!

I own several of the 3933163 intakes and have seen tons of
them over the years. I ran across this today and was
instantly stumped. It's an older style 3933163 intake with
a spread bore pattern for the carb.. Anybody ever seen
anything like this before? Could it be for marine applications?
If so, wouldn't it still be a different part number?

This is a strange one..... http://www.yenko.net/ubbthreads/images/graemlins/hmmm.gif

Steve

http://webzoom.freewebs.com/nuch_ss396/misc/3933163%2Dspreadbore1.jpg http://webzoom.freewebs.com/nuch_ss396/misc/3933163%2Dspreadbore2.jpg
http://webzoom.freewebs.com/nuch_ss396/misc/3933163%2Dspreadbore3.jpg

[firstgenaddict]

Looks like someone modified a 163 probably for racing where they had to run a quadrajet.

[COPO_Anders]

The marine-intakes I have seen all had brass waterpassages.

[SuperNovaSS]

I believe the intakes with brass passages carried a different part number. The later 163 intakes had the snowflake and firing order is different spots. Possibly a late 70's service part? It sure would look the part one a carb was mounted.


Jason


Jason

[firstgenaddict]

Give us a straight down shot directly over the carb mount surface looking into the plenum and an oblique view from one of the front corners would be great (I want to see the machining marks in the secondary openings).
I beleive that it is a standard 163 with the plenum opening for the carb modified.

[69L72RS]

I think you can see the step where the secondaries were machined in instead of cast in, in the top right picture.
I have had them like this in the past, where the intake was modified to work with Q-jets without using a spacer/adapter.
Eric

[nuch_ss396]

That's all the images I have of this intake.

Julian - You've seen '163 intakes with a spread-bore pattern
from the factory before? That doesn't make any sense. The
'163 intake was an SHP item and Rochesters were not. I
thought this was an oddity, now I'm even more confused.

Steve

[69L72RS]

Steve,
Sorry for the confusion.
I have had a few that were "modified" to be used with a Q-jet carb. They were not factory production intakes. One of them was done using hole saws to cut the larger openings, because the guy didn't have a boring head for his mill. You can imagine what it looked like.
Some people just won't run a Holley carb and have to have a Q-jet to be happy.
Again, sorry about the confusion. http://www.yenko.net/ubbthreads/images/graemlins/beers.gif
Eric

[indyjps]

some stock car classes required q jets some required iron manifolds.

[nuch_ss396]

Here's an original '163 intake. Guess someone could have
used a hole saw or similar to open up the intake in question
for a Rochester. Sure hope they didn't try to run that
setup against a set of oval port heads.

http://webzoom.freewebs.com/nuch_ss396/Camaro/3933163%5Fintake.jpg

[HS PROFESSOR]

I've run rectangle to oval many times. As different as the ports are it will still run unbeleivably well. Oval to rectangle works real well.

[nuch_ss396]

Bob,

When starting out in the big block world, I was cautioned
numerous times to be careful about buying any BB engine
without checking cylinder head casting numbers for exactly
the reason you mentioned. Seems that a common ploy used to
be putting a rectangular port intake on an oval port engine
and selling it as an SHP verient. I heard if it being done,
but never with a positive spin regarding performance.

I would think that the great interruption of air passing
through the rectangular passages of the intake hitting the
oval ports of the heads would be counter productive to air
flow due to turbulance.

In your opinion, how well does this setup perform? Just
wondering. http://www.yenko.net/ubbthreads/images/graemlins/hmmm.gif

Steve

[firstgenaddict]

I have seen it done before as well... bought a 69 Nova with a rectangle intake on oval heads... we changed the intake and did not pick up any time in the 1/8th... Suprised the hell out of me.
Then we went back to the rectangle intake AND put on rectangle heads... then we picked up a bunch o time... about 1 second in the 1/8th also put a solid roller bumpstick in it... http://www.yenko.net/ubbthreads/images/graemlins/hmmm.gif maybe that was the reason for the pick up in time... http://www.yenko.net/ubbthreads/images/graemlins/dunno.gif