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Thread: 427 or 383 ?????
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01-06-2012, 07:39 AM #1
- Join Date
- Aug 2011
- Location
- Intercession city,fl
- Posts
- 30
Navy blue- 2002 Pontiac Trans am
427 or 383 ?????
alright I have a '02 T/A 6speed with a stock LS1, its got slp 1 3/4 headers and "3 borla exhaust!
This my list :
102/102tb with fast fuel rails
TEA cnc's 243s flowing 320 on the intake & 258 on the exhaust
with 2.04 in & 1.575 exh
millled .040=60cc's chambers
400lb springs@ .650 lift
I was gonna put this on my LS1, but now I wanna a LS3/L92 block so I can stroke it to 427 cubes!
Will my heads & intake fit this block, I found a great deal on a short block,
also will this block be a direct bolt on to my '02 T/A?
I know Im gonna have to dish the pistons to have around 11.5 to 1 cr,
or I'm I better stroking my LS1 to a 383
This car is my weekend warrior and not my DD, but I like to keep my a/c and p/s and yes I got a 9in with 3.89 gears, thanks !!!!
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01-06-2012, 07:47 AM #2
- Join Date
- Dec 2005
- Location
- Laurel, Maryland
- Posts
- 4,975
2000 Grand Prix GTP- 2000 Trans Am WS6 M6
Are those parts you already have in your possession?
There are little changes between the GenIII (LS1/2/6) and GenIV (LS3/4/7/9) motors, and none of those changes effect bolts holes for heads, transmissions, motor mounts, or front accessories (except in some cases of the iron blocks).
I currently have cathedral port heads on my 427 LS3. At the time, they were one of the best flowing heads besides LS7 heads, but they require a bigger bore (4.125") than the LS3 has (4.060").
Dishing pistons = lower compression. If anything, you want flat top pistons or domed pistons to increase the compression ratio. I have flat top pistons (with 3cc valve relieves) and I have a 11.8:1 compression ratio. This is pushing the limit of pump gas in a street car.
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01-06-2012, 09:31 AM #3
- Join Date
- Aug 2011
- Location
- Intercession city,fl
- Posts
- 30
Navy blue- 2002 Pontiac Trans am
yes I already have all of this parts !!!
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