Re: 383 pistons in 426 wedge
[Re: AndyF]
#302476
04/29/09 03:24 AM
04/29/09 03:24 AM
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Joined: Aug 2003
Posts: 12,291 Kent, Wa
340SHORTY
Truck Nut
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Truck Nut
Joined: Aug 2003
Posts: 12,291
Kent, Wa
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put a blower on it or turbo it. that compression is perfict for either...
I am truckless..
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Re: 383 pistons in 426 wedge
[Re: 6PakBee]
#302480
04/29/09 11:27 AM
04/29/09 11:27 AM
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Joined: Jan 2003
Posts: 16,123 Grand Haven, MI
patrick
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 16,123
Grand Haven, MI
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a cheaper alternative might be to get a 4.15" cast stroker crank.
kb-silvolte.com shows the #1271 piston (for a 383) as a 1.848" comp height.
1.848+6.76+(4.15/2)= 10.683", or .042" in the hole based on the blueprint height of 10.725" for an RB block.
based on my calculations assuming a .040" head gasket and 88cc heads, you're looking at about 9.96:1 compression
use a largish cam or a wide LSA to make the intake closing point late to bleed cyl pressure, and it should run on pump premium.
1976 Spinnaker White Plymouth Duster, /6 A833OD 1986 Silver/Twilight Blue Chrysler 5th Ave HotRod **SOLD!*** 2011 Toxic Orange Dodge Charger R/T 2017 Grand Cherokee Overland 2014 Jeep Cherokee Latitude (holy crap, my daughter is driving)
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Re: 383 pistons in 426 wedge
[Re: Alexdodge]
#302481
04/29/09 11:36 AM
04/29/09 11:36 AM
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Joined: Dec 2006
Posts: 3,533 Indiana
Fury Fan
master
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master
Joined: Dec 2006
Posts: 3,533
Indiana
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Quote:
With these pistons the car is a real dog. Don't know where to go from here. Its only a touring and cruiser but I still would like it to run better than this. Any one have any ideas? Alex
If you want some easier-than-pistons ideas, I'd recommend: 1. Install -516 heads for the closed chambers and smaller valves/ports (higher velocity). 2. Advance the cam a few degrees. If you have a 'big' cam, consider a swap to an RV or stock cam. 3. Put a fast advance curve in the distributor. Due to your total lack of quench, you still might have detonation issues even though your compression is low, you'll just have to see. 4. Make sure you have a dual-plane intake and a smaller-size carb (or maybe a smallblock Thermoquad?). If not, try to find a 413 or 1966 440 intake, they have smaller flatter runners and might give more velocity than a performance intake. They are easily identified because they kinda look like they've been stepped on.
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Re: 383 pistons in 426 wedge
[Re: patrick]
#302482
04/29/09 12:54 PM
04/29/09 12:54 PM
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Joined: Mar 2008
Posts: 5,746 Ontario, Canada
Dodgem
master
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master
Joined: Mar 2008
Posts: 5,746
Ontario, Canada
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Quote:
a cheaper alternative might be to get a 4.15" cast stroker crank.
kb-silvolte.com shows the #1271 piston (for a 383) as a 1.848" comp height.
1.848+6.76+(4.15/2)= 10.683", or .042" in the hole based on the blueprint height of 10.725" for an RB block.
based on my calculations assuming a .040" head gasket and 88cc heads, you're looking at about 9.96:1 compression
use a largish cam or a wide LSA to make the intake closing point late to bleed cyl pressure, and it should run on pump premium.
better check your math 1.848 + 6.76 + (3.75/2= 1.875) = 10.483 - 10.725 = -.243 About 7 to 1 compression give or take
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Re: 383 pistons in 426 wedge
[Re: Fury Fan]
#302483
04/29/09 12:56 PM
04/29/09 12:56 PM
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Joined: Jul 2008
Posts: 403 NE Ohio
71 FJ6 Charger
mopar
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mopar
Joined: Jul 2008
Posts: 403
NE Ohio
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Dont mean to hi-jack the post,but can you use 426 wedge pistons in a 383 with stock heads,crank and rods?
'71 383HP FJ6 Charger SE
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Re: 383 pistons in 426 wedge
[Re: 71 FJ6 Charger]
#302484
04/29/09 01:20 PM
04/29/09 01:20 PM
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Joined: Mar 2008
Posts: 5,746 Ontario, Canada
Dodgem
master
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master
Joined: Mar 2008
Posts: 5,746
Ontario, Canada
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Quote:
Dont mean to hi-jack the post,but can you use 426 wedge pistons in a 383 with stock heads,crank and rods?
Piston part number please?? I think you will find a 426 W piston will stick out of a 383 a couple hundered thou.
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