stock 383 need to bump up just a bit whatya think?
#568805
01/01/10 05:31 PM
01/01/10 05:31 PM
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Joined: Dec 2009
Posts: 67 Florida
T-Man
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I would like to take my stock rebuilt 383 and bump it up just a bit.
I already have a holly street dominator. I will be adding HP manifolds with flowmasters. And it already has a edelbrock carb that is running fine.
So I would like to bore it out .030 and add domed pistons and a cam.
What do you'all suggest?
The car has PS A/C and it has an automatic that I'm going to leave stock except for a shift kit.
I would like a lumpy idle but decent street manners and yet run it at the strip a couple times a year.
Got some 28" x 9" x 15" M/T slicks.
Also has a 4:10 SG that will be bringing up the rear.
So just want to bore it out add domed pistons and a lumpy cam.
Thanks guys
67 plymouth satellite
72 plymouth roadrunner
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Re: stock 383 need to bump up just a bit whatya think?
[Re: Moparteacher]
#568811
01/01/10 06:55 PM
01/01/10 06:55 PM
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T-Man
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It is a 1967 383 so it has the closed chambered heads.
\I do not know the cc's of these at this time.
67 plymouth satellite
72 plymouth roadrunner
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Re: stock 383 need to bump up just a bit whatya think?
[Re: 383man]
#568814
01/02/10 01:33 AM
01/02/10 01:33 AM
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Joined: Apr 2007
Posts: 871 WA 98043
thecarfarmer
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super stock
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WA 98043
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With 4.10's, Street Dominator intake, and the other stuff, you could run a healthy cam with a loose convertor, or a smaller cam w/ stock convertor.
If it were me, I'd think about one of those newer 9.5" convertors and pick the cam from the bottom part of the page.
The way I look at it, a person could take your basic chassis/gear/longblock, and either build a car that runs mid fourteens, or high twelves. The cam and convertor will be the biggest difference.
I know which way I'd go...
I'd also think hard about whether I really wanted to spend the money to switch over to stock HP exhaust manifolds, too. As opposed to a set of inexpensive headers, which would be a noticeable step up from them.
Also, might be worth a call to Dwayne Porter (aka Fast68Plymouth here on the board) to have him spec a cam EXACTLY for your combination. He's one of a number of guys who're real good at picking lobes to make that engine of yours fly. Especially if you really want to stick w/ iron manifolds.
Just my .02.
-Bill
Seduce the attractive, and charm the rest.
******
489 C.I.D., roller cam, aftermarket heads, tunnel ram, stock '54 Dodge rear axle assembly: which of these doesn't belong?
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Re: stock 383 need to bump up just a bit whatya think?
[Re: thecarfarmer]
#568818
01/02/10 08:15 AM
01/02/10 08:15 AM
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Joined: Dec 2009
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T-Man
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Thanks guys.
The heads have been go thru and are working fine. so They will not be changed. If I understand it correctly the 516's cc about 78 is that correct. If so then domed pistons are out.
So a good set of flat tops and try to end up around 10.0 to 1 are in.
Next the HP manifolds I already have along with the flowmaster exhaust from front to back.
I was looking at the e268h comp cam, but on the installation notes it is saying you need to do head work, stock springs are out and you need adjustable valve train. So that would kinda kill the idea of not touching the heads. Although I'm not opposed to taking them apart and relieving an area for clearance issues. Adding better springs and adjustable rocker arms. But I was trying to stay away from doing that.
I also did not want to change the converter unless absolutely necessary.
Thanks for your help so far.
Would love to hear is someone knows the cc's for sure on 516 heads and e268h install stories.
Thnaks again
gary
67 plymouth satellite
72 plymouth roadrunner
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Re: stock 383 need to bump up just a bit whatya think?
[Re: T-Man]
#568819
01/02/10 10:25 AM
01/02/10 10:25 AM
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Joined: Jan 2003
Posts: 10,011 Frostbitefalls MN (Rocky&Bullw...
gregsdart
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Any kind of cam change without a converter change is really going to hurt low speed performance. Keep a very close eye on the intake closing point of any new cam you look at. four degrees or less added intake closing point will probably not hurt too much, start going beyond that and you had better get some more compression in it and a looser converter. Two items that stand out that will help you are a flat tappet cam and a stroker. The solid cam will allow a more agressive profile and still have a reasonable intake closing point due to the lash. The stroker will give you the bottom end grunt to really work the stock converter and make it a whole new motor torque wise. Nobody need know about the stroke increase either! If you start playing with numbers, you can come up with a 9.5 to one combo with flat top pistons, making sure piston to head is inside .035 to .040 . That will help wake up the motor. You have many options. A stroked stock 383 crank (3.54)can use a chev rod and rod bearing in a long rod of 6.7 or 6.8 length, giving you a piston compression height of 1.5 to 1.4. That would allow for a light piston, and really help things out. You would be at 406 cubes, .030 over. These suggestions may or may not be inside of what you are willing to do, but thought I would throw them out there to give you some ideas.
8..603 156 mph best, 2905 lbs 549, indy 572-13, alky
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Re: stock 383 need to bump up just a bit whatya think?
[Re: gregsdart]
#568820
01/02/10 10:33 AM
01/02/10 10:33 AM
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Joined: Jan 2003
Posts: 10,011 Frostbitefalls MN (Rocky&Bullw...
gregsdart
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I Live Here
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Seems you want to change things as little as possible, so I thought I would throw out another scenario. If your current pistons and rings are in great shape, you can pull the heads, check the piston to head, have them cut if need be to max out compression, and adjust the piston to head clearance a bit if thicker than stock gaskets are in it now. Then add a good cam, tune it, and enjoy.
8..603 156 mph best, 2905 lbs 549, indy 572-13, alky
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Re: stock 383 need to bump up just a bit whatya think?
[Re: ademon]
#568823
01/02/10 04:08 PM
01/02/10 04:08 PM
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Joined: Apr 2007
Posts: 871 WA 98043
thecarfarmer
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4 decade old springs = bad idea. Even if they've never run, they've been under load for 40 years. These will drop in and give enough load for whatever you're likely to run w/ stock heads. Their #1105 spring would probably do well for a lot of applications, too. When the springs are off, just make sure that the retainers won't smack the tops of the guides. That's NOT a good thing -Bill
Seduce the attractive, and charm the rest.
******
489 C.I.D., roller cam, aftermarket heads, tunnel ram, stock '54 Dodge rear axle assembly: which of these doesn't belong?
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