383 cam help
06-23-2009 | 10:02 PM
#1
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383 cam help
I am new to motors so bare with me. I picked up a 383 for my 76 dodge power wagon. It has flat top pistons, windage tray, balanced, weiand 7511 manifold, holley 750 carb, 452 heads that have been rebuilt with new springs, valves, and valve job. The heads have been lightly ported. I am going to port match everything myself. I also have a medium size turbocharger for it. It is made by BRE. All of the parts are about 15 years old, but in really good condition. I need HELP figuring out which cam would be best. I want it to have a linear power, but I also want it to rumble a little bit and make good power. The truck has power brakes. So I guess I cant go too big, and it is heavy. I basically want the best all around cam. Hopefully there is one out there. THANKS.
06-23-2009 | 10:25 PM
#2
Mopar Lover
Joined: Apr 2009
Posts: 1,892
Likes: 4
From: Michigan: The First Line of Defense From The Canadians!
Lots of conditional factors here. When you throw in a turbo....everything most of us know goes out the window. The cam tech lines are the best way to go. They have computer programs that can plug in everything. One word of advice, if you are in between cams for selection, get the smaller one. Being over cammed sucks.
06-24-2009 | 06:16 PM
#8
Mopar Lover
Joined: Mar 2009
Posts: 837
Likes: 2
From: Springfield NE
I would pull the head and take some measurements.
1. top of deck to top of piston at top dead center (deck heigth)
2. Volume of the piston notches ( use a graded burette in cc's){summit}
3. Thickness of the head gasket after compressed
4. Actual cc's of the combustion chamber ( graded burette in cc's)
{these measurements should get you close to accurate}
Then you can "plug" the numbers into a compression ratio calculator on the internet. [wish I had a site handy, east to find though]
A .030 overbore on a 383 comes out to 4.280
B The stroke of the 383 is 3.38. {or very close approx.}
1. top of deck to top of piston at top dead center (deck heigth)
2. Volume of the piston notches ( use a graded burette in cc's){summit}
3. Thickness of the head gasket after compressed
4. Actual cc's of the combustion chamber ( graded burette in cc's)
{these measurements should get you close to accurate}
Then you can "plug" the numbers into a compression ratio calculator on the internet. [wish I had a site handy, east to find though]
A .030 overbore on a 383 comes out to 4.280
B The stroke of the 383 is 3.38. {or very close approx.}
06-24-2009 | 07:56 PM
#11
Mopar Lover
Joined: Mar 2009
Posts: 837
Likes: 2
From: Springfield NE
[also turbo's like more exhaust duration on the cam;call comp cams info]
Should be interesting though, a 383 with a turbo all in a power wagon, crazy man!
06-25-2009 | 03:04 PM
#12
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Probably a little crazy. I have a 64 sport fury also, but it needs a lot of work. It might take quite a few years. I am building this truck so I can sell my expensive chevy truck. I actually got the truck for free, and it is in really good condition. I have a old stock 426 hemi that needs completely rebuilt for the 64. All I need is to win the lottery. Again thanks for the help.
06-28-2009 | 08:57 PM
#14
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I have been researching online, and found out some info. Turbo cams are totally different than other cams. It depends on the size of the turbo, but air reversion is a problem. To fix this a cam with 112-114 lca is best. Also the exhaust cam should stay open past tdc. I am going to call Crane soon to figure out the best cam for my engine/turbo combonation. THANKS ALL.
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