What carb are you running, style and size?
intake plenum
- Thread starter twayne24365
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twayne24365
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its a holley 800 double pumper
roccodart440
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So you are running a square bore 4150 on a spread bore intake. This in itself seems like a bad idea to me.
Also is this is a 383 engine or a 440?
a 400 hp 383 is pretty strong. 400hp 440, not so much..
Rocco, he has a 383 intake pictured. But more importantly, the idea of a squarebore carb on a Spreadbore intake isn't so much a bad idea but an issue of the way it is and how things go, or work.
A spreadbore intake has problems with fuel distabution (sp?) The spreadbore intake has two basic reasons for its design.
1st, the factory went with a spreadbore carb and needed the intake modified to begin with.
2nd, the aftermarket designed there intakes for 1 of 2 reasons with a spreadbore carb pad.
1; factory replacement part/mild performance.
2; certain catagories in racing say you must use a stock carb for the carb in which the TQ is it.
Many squarebore carb pad intakes are also not all that. They all have air and fuel problems, but not as bad. (For the most part that is!) most aftermarket intakes will show a marked improvement with epoxy and/or a dremel grinding.
This is so not to say all intakes suck or need improvement but certainly they all can be worked on to be better.
The bennifit for us is (mostly back in the day bennifit) that you can save money with a intake matched to your OE carb being re used and only needing a tuning kit.
A spreadbore intake has problems with fuel distabution (sp?) The spreadbore intake has two basic reasons for its design.
1st, the factory went with a spreadbore carb and needed the intake modified to begin with.
2nd, the aftermarket designed there intakes for 1 of 2 reasons with a spreadbore carb pad.
1; factory replacement part/mild performance.
2; certain catagories in racing say you must use a stock carb for the carb in which the TQ is it.
Many squarebore carb pad intakes are also not all that. They all have air and fuel problems, but not as bad. (For the most part that is!) most aftermarket intakes will show a marked improvement with epoxy and/or a dremel grinding.
This is so not to say all intakes suck or need improvement but certainly they all can be worked on to be better.
The bennifit for us is (mostly back in the day bennifit) that you can save money with a intake matched to your OE carb being re used and only needing a tuning kit.
twayne24365
Well-Known Member
Yea its pretty stout or a stock 1965 383, but like rumblefish said the gains to be had by doing this stuff is minimal, but 2 or 3 hp here and there all add up 
, i would also like to play with the cam timing but that will be for another thread once its runnin
, i would also like to play with the cam timing but that will be for another thread once its runnin
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