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Engine Swap Everything about swapping an engine into your Third Gen.....be it V6, V8, LTX/LSX, crate engine, etc. Pictures, questions, answers, and work logs.

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Old 08-15-2003, 06:05 PM   #1
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Join Date: Apr 2002
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Car: 86 T/A
Engine: 383
Transmission: ProBuilt 700R4 2800 Stall
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377 vs 383 vs 400

Im currently interested in swapping out my 305 for something bigger and better. My question is which setup can i get more hp and torque out of.

Utalizing a smaller bore with bigger stroke like with the 383

or

Take a 400 block with 3.48 stroke, this i hear will rev up alot higher.

or just go with the 400 block and a 3.75 stroke.

What am i going to be able to get the most power out of? Also i was wondering if my TPI setup off of my 305 would bolt right up to a 400?
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13.06 @ 105mph at 5,800' Elevation.
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Old 08-15-2003, 07:17 PM   #2
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Engine: 350 firebreathing inches of Small Block Chevrolet
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Well I have never heard one good thing about a 377, aviod it. But if you want good sized power #'s (any thing over 300HP). I would suggest a Stelth Ram on top of a 400 bored to 406. Get some nice heads and headers and you will have a great engine set-up.

Good Luck, Later, Garrett
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1984 Z/28 Camaro, 406c.i. (383 Horse, 456 Torque) 13.6 1/4 mile, sold 11/25/01
1982 Z/28 Camaro, 355c.i. (419 Horse, 406 Torque) 12.9 1/4 mile, sold 5/28/02
1980 T / A Firebird, 400c.i. (150 Horse, 400 Torque ) T-tops, WS6, sold 7/23/02
1991_B4C_Camaro, 350c.i. (260 Horse, 365 Torque) 14.2 1/4 mile, sold 1/25/03.
1967_SC__Camaro, 302c.i. being built right now, Turbo 400, and a 3.73 disc rear.
1980 El Camino SS, 350c.i. w/ a Garrett Turbo @ 10psi
1975 Monza Spyder 262c.i. V-8, Full fiberglass body, 13.6 1/4 mile, sold 5/28/03.
1991___Formula___ 350c.i. Hypertech Chip, K&N Filters, B&M Shift kit, and loaded.

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Old 08-15-2003, 11:05 PM   #3
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i agree...go for the 406 with 195-200 cc heads and a LT1 type intake.

itll get up and go...and pull like a raped ape
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Old 08-16-2003, 03:08 AM   #4
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Cubic inches = power unless you have cubic dollars
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Old 08-19-2003, 12:58 AM   #5
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No replacement for displacement... and (pick a number)hp in a 400 will be more durable and reliable than (same number)hp in a smaller engine.
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Old 08-20-2003, 08:18 PM   #6
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Engine: 383
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can i take the TPIS Big mouth manifold off the 305 and bolt it right up to a 400?
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Old 08-20-2003, 08:42 PM   #7
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Of course it will. Don't know why you'd want to though. That's no where near the airflow you will need for a powerful 400. However It would work pretty good on a 383 seeing as how all of its power is downlow. There is nothing wrong with a 377 however because they like power at the top end there not that good on the street.


Steve
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Old 08-21-2003, 07:08 PM   #8
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the real question is.. how fast do you want to go.

what kind of use will the car see.

what type of gas do you want to run.

What is your budget.
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Old 08-23-2003, 02:08 PM   #9
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Join Date: Apr 2002
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Car: 86 T/A
Engine: 383
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Well i would like to keep it street legal, but yet i want the sucker to scream. All i run for gas anyways is 91 octane. I dont want to be having to put in octane booster in every tank, or have to stop at the track every day for race gas.
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Old 08-23-2003, 10:29 PM   #10
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Like said No Replacement for Displacement. If you want a screamer, find yourself a good 400 block, get a light weight billet steel crank, titanium rods, lightweight pistons. Titanium valvetrain, solid roller cam. Huge heads and equally huge manifold, huge flowing that is. Now you have a car engine with the RPM band of a crotch rocket!!!

Seriously though a 383 with a Mini Ram or Stealth Ram and a well choosen valvetrain will pull great on the street. The only 377s I ever heard much about were on race cars. Mostly small, lightweight cars. They didn't need the gobs of torque to get moving, they wanted high RPM charge. I say stay away from it for a heavier car, especially if it is going to see much street duty.
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Old 08-23-2003, 10:29 PM
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