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Thread: 350 or 400 turbo
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05-05-2016, 07:51 PM #1
350 or 400 turbo
I will be converting my m6 car to a auto. I have a 350 and 400 Turbo. I know the 400 is tougher but takes more to turn it. Engine is a 383 12:1 compression, ported 643 heads custom grind cam on a 250 shot. 28 inch tire 373 or 4:11 gears. It will be mainly a street car.
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05-05-2016, 07:57 PM #2Lurker
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I would do the 400. If your doing mainly a street car to drive. I would get in touch with @Cahall. You may want to look into a 4L60E for overdrive and improved street manners.
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05-05-2016, 08:01 PM #3
I have a 350 and 400 already both in great working shape.
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05-05-2016, 08:23 PM #4LTx Guru
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Street car.... 4.11 gears.... no O/D. Not too street friendly, unless you avoid freeway driving. With street tires, I was turning almost 4,000 RPM at 70 MPH. It is a non-locking converter, which didn't help. Didn't take long before I opted for a Gear Vendors O/D. With the torque available from the 250-shot go with the 400.
SOLD - GONE TO A (VERY) GOOD HOME ! - 94 Formula A3+1: 381ci forged stroker - Callies Stealth, Oliver 5.85 billet rods, BME nitrous pistons / CNC LT4 heads / CC solid roller / TH400+GearVendors OD / 4.11 Strange 12-bolt / 300-shot N2O / Spohn Suspension / roll bar / MoTeC M48 Pro engine management system /a few other odds 'n ends.
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05-05-2016, 08:25 PM #5
Th400 damn near unbreakable when built right, the th350 isn't really a huge step up in strength from a 4L60e and might even seem stronger just because so few people know how to properly build a 4L60e.
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05-05-2016, 08:28 PM #6
Its going to be a weekend car mostly to shows and to the track.
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05-05-2016, 08:45 PM #7The FABRICATOR!
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Will you be running 1/8 or 1/4 mile? What is the max rpm you want to spin the engine? You may consider a higher gear, maybe a 3.50 ratio. It would help with the highway rpm as well as cross the beams at a more reasonable rpm
Chris
1985 Monte Carlo SS
Mods: 9:1 383 LT1, Ported Trick Flow heads, D1SC Procharger, 4L80E, 3.50 9"
Check out the M122 MCSS build thread here!
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05-06-2016, 08:17 AM #8
What are you doing with the M6?
'94 Trans Am GT A4 "Ballin' On A Budget"-LPP LT Headers, ORY, CAI, Hooker Catback, TB Bypass, TB Air foil, and a handful of cheap appearance mods...
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05-06-2016, 09:04 AM #9Lurker
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another vote for 400, seems u should be making good power and tq
Kyle
just ur everyday slow LT1. wanna try her out?
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05-06-2016, 12:36 PM #10
Selling it.
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