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Aluminum 327 Intake Manifold (3890490) - Can it be saved?
Can this be returned to original? I have had this laying around for 25 or so years. Not sure how I came to own it...and I had no part in its butchery. Question is, can new aluminum pieces be welded back inside and can this function as new? Why would this have been done in the first place? Thanks for any help........
Milling out the divider is an old hotrodder trick. It was to move the power band of the manifold up a bit. FWIW, L88 intakes are just L72 manifolds with the divider removed by the factory.
So, as it is, I should be able to bolt it onto my 66 327 300 and be good to go? Does it add much HP?
Originally Posted by Avispa
Milling out the divider is an old hotrodder trick. It was to move the power band of the manifold up a bit. FWIW, L88 intakes are just L72 manifolds with the divider removed by the factory.
Not if you don’t have the heads and cam to compliment it, you will loose low end torque. It would be a candidate for a throttle body type fuel injection setup.
It was done to do 2 things, increase upper rpm power, and improve the air fuel balance between each side of the engine. The way it was originally made each section fed 2 cylinders on each bank. By opening it it allowed all of the flow from the carb to be more evenly distributed. How well that worked I can't say. Most carbs idle and perform better with a 4 hole spacer with the correct gasket on an open plenum, it improves the signal to the Venturi. I would guess if you installed it as is you wouldn't notice a huge difference. I know it was done a lot back then. I never did it, I used single plane manifolds.
It was done to do 2 things, increase upper rpm power, and improve the air fuel balance between side seats of the engine. The way it was originally made each section fed 2 cylinders on each bank. By opening it it allowed all of the flow from the carb to be more evenly distributed. How well that worked I can't say. Most carbs idle and perform better with a 4 hole spacer with the correct gasket on an open plenum, it improves the signal to the Venturi. I would guess if you installed it as is you wouldn't notice a huge difference. I know it was done a lot back then. I never did it, I used single plane manifolds.
This explains a lot to me. My 67 L79 intake is modified like this. I never knew why, Now I do. Thanks!
I use to build a race engine for a friend that had one of these. Never noticed any difference. It wouldn't make the manifold completely divided but would get you closer. Myself I would run it as is. Years ago ever hot rod magazine had articles about removing the wall to improve performance. If I remember correctly this is about 1/2" thick.
05-16-2020, 08:36 PM
Aluminum 327 Intake Manifold (3890490) - Can it be saved?
