Stock Intake manifold
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Stock Intake manifold
Hi , I read a while ago some guy was using stock 400 intakes to make dual and signle plane manifolds by making huge holes on it. I took mine in my 351m and made 2 huge squared holes where the standar 2 circled holes were and made a 1 1/2" aluminium spacer/adapter to bolt a 4bbl carb. the spacer/adapter made it a single plane since it didnt separte both holes....
this invention worked very well for my mild 351m...I just bought stuff to make it a 400 from tim and ran out of money and will be using this invention for months meanwhile i finish my project....
I was wondering several things
1. is the stock intake capable of flowing well enogh with the big holes to make a mild 400 rev to 5k ?
2. will it be better to gring away the wall dividing the 2 holes to make it fully single plane? it seams a good idea making this a sigle plane with good port veocity due to the small ports of the stock intake..
3. arent new aluminium intakes based on this old one?
opinions please, Thanx.....
this invention worked very well for my mild 351m...I just bought stuff to make it a 400 from tim and ran out of money and will be using this invention for months meanwhile i finish my project....
I was wondering several things
1. is the stock intake capable of flowing well enogh with the big holes to make a mild 400 rev to 5k ?
2. will it be better to gring away the wall dividing the 2 holes to make it fully single plane? it seams a good idea making this a sigle plane with good port veocity due to the small ports of the stock intake..
3. arent new aluminium intakes based on this old one?
opinions please, Thanx.....
Postmaster
Joined: Aug 2001
Posts: 4,270
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From: Delaware
1. is the stock intake capable of flowing well enogh with the big holes to make a mild 400 rev to 5k ?
No, the ports are too small.
2. will it be better to gring away the wall dividing the 2 holes to make it fully single plane? it seams a good idea making this a sigle plane with good port veocity due to the small ports of the stock intake..
Making a single plane will hurt the air/fuel mixture velocity through the carb at low RPM. This will result in a poor mixture.
No, the ports are too small.
2. will it be better to gring away the wall dividing the 2 holes to make it fully single plane? it seams a good idea making this a sigle plane with good port veocity due to the small ports of the stock intake..
Making a single plane will hurt the air/fuel mixture velocity through the carb at low RPM. This will result in a poor mixture.
Hotshot
Joined: May 2003
Posts: 11,141
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From: south louisiana
You'd have done better simply by replacing the stock 2 bbl carb with a Holley list 4412 500 cfm 2bbl. And leaving the intake alone. Last 400 I had would rev to 6 grand with nothing more than this intake/carb combo, a Summit p/n 5200 cam and long tube headers.
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yeah i mean i have a large cam and a great bottom end with 10:1 cr,a edelbrock performer 750 manual choke carb laying around and no money left for an intake so I made the huge hole in the stock intake and made some plate adaptors and snapped in the carb. dont know how it works yet though.....I was wondering bout the ports in the intake......thanx
Thread Starter
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Posting Guru
Joined: Jul 2007
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yeah i mean i have a large cam and a great bottom end with 10:1 cr,a edelbrock performer 750 manual choke carb laying around and no money left for an intake so I made the huge hole in the stock intake and made some plate adaptors and snapped in the carb. dont know how it works yet though.....I was wondering bout the ports in the intake......thanx
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