It is just one part of the big picture but a real nice part to start with.
409 High HP 2x4 Intake Coming soon Plus Z-11
- Thread starter BSL409
- Start date
Definitely a big picture setup. If the cam and other parts don't support the extra power, you'll never see it.
With "normal" mounting the carbs will have the idle and part throttle circuts on both sides of the engine,sideways puts them on the same side .Side ways holleys will need to be mechanical secondary and for fuel distribution,will have to be direct linkage.This is a 'race only' set up,not at all suitable for the street.
Skip FIx
Well Known Member
Some sideways have a primary(idle circuit) on opposite sides but correct generally no vacuum will fit sideways that way. Even DP on our dual quads don;t fit sideways a 4224 will with a trimmed linkage on pulling the vacuum dashpots and making them mechanical.
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Both vacuum secondary's and progressive will fit on this manifold and work fine.
Some of the primary linkage might need to be trimmed below the throttle plate on some carbs.
The engine doesn't care what way the carbs are facing inline or sideways.
We use progressive HP series dbl pumpers all the time, they have proven for us to be the best for power and drivability and they are completely happy on the street also.
I personally would never use 4150 series vacuum carbs on this manifold, it just doesn't make sense.
Carl
Some of the primary linkage might need to be trimmed below the throttle plate on some carbs.
The engine doesn't care what way the carbs are facing inline or sideways.
We use progressive HP series dbl pumpers all the time, they have proven for us to be the best for power and drivability and they are completely happy on the street also.
I personally would never use 4150 series vacuum carbs on this manifold, it just doesn't make sense.
Carl
johnnyriviera
Well Known Member
I have the CRW version of the intake running sideways double pumpers with four corner idle circuits. No problems on street for me.
johnnyriviera
Well Known Member
I just realized my avatar photo is old and shows my old setup, I need to update!
I dug this Yellow Bullet thread up for another post...
http://www.yellowbullet.com/forum/showthread.php?t=564294&highlight=lamar
I noticed that in post #13 he mentions that a manifold similar to this was worth 90 extra horsepower over the factory manifold.
As others have said, the gains wouldn't be nearly as big on a milder engine, but it sure does seem to work well.
409 Chevy Performance
Well Known Member
Received McQuillen Blower intake manifold and installed it on a 348 block 3755011, stroked to 4.00, 6.385 rods, bored to 4.185 for 440 c.i. Installed Blower shop 6.71 blower with 2x4 holleys 600 cfm. Engine dyno by John Beck Racing. dyno results are torque @ 4800-5000 654 ft. and made 717 HP 6400 rpm on 91 octane pump gas. The Carl McQuillen intake fit perfect and we had no issues with the install. High quality of workmanship on the intake!!!
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But, what about at least one picture of this engine?
MRHP [Brian],Don't do it ! I can hear the wheels turning from here!
654 ft lbs of torque!!! 
agentorange
Active Member
Will be great to have it in my hands. Jack, you were great to work with. Thanks a lot.