OK im going to be ptting in a lt1 and t56 in to my 69 chevelle and i want to know what is the best year motor and what are the diff. between the years. Also i thought the last year of the lt1 was 97 but in a lot of my parts books they say the last year was 96 lik ewhat the hell could some one please help.
Announcement
Collapse
No announcement yet.
Whats the best lt1
Collapse
X
-
fastTa
97 was the last of the LT1's. Well at least for the f-body. Y-body's got the LS1 in 97.
To my knowledge the 95-97 LT1 is the same motor and PCM.
-
AFAIK, they are all the exact same in the actual motor. In ~'95, they went to a vented distributor. '93 was a SD setup. Other than that, I don't think there were many changes at all. Wait, fuel rails changed in '95 IIRC. Okay, I think thats it.
Basically, there is no BEST LT1. Just mod the hell out of whichever one you can get, and it will be fast enoughmy car:
'86 Caprice Classic. Soon to have a 350 crate motor. Shooting for 300rwhp.
the project:
check the www for pics, but a '36 Chevy Master Sedan, MII front end, Jaguar IRS, '93 LT1 powerplant with plans for 350rwhp, and many many other goodies
Comment
-
There are several variants.
Vettes got aluminum heads and 4 bolt main bearing caps.
F-bodies got aluminum heads, 2 bolt main bearing caps.
B-body (impala) got iron heads, 2 bolt main bearing caps.
Other than that, from 92-97 the LT1s went though several tuning configurations from speed density up to 93, maf systems from 94 and up along with OBDI up to 95, OBDII from 96 and later.
As far as what's the best? Opinion...... the vette has 4 bolt mains so that is a little stronger if you go with power adders, aluminum heads are nice, but the iron heads from the b-body aren't that bad either. A little less HP, but still the same torque.
Comment
-
For the F-Body:
All cars used the same 2-bolt main block. As far as I know, there were never any changes to the block, other than the few 4-bolt main LT4 setups that were used in the 97's. Any factory replacements under warranty were also 4-bolt mains.
All Corvettes had the 4-bolt main block, so that makes a Corvette engine more desirable in my mind. That block has reliably porduced over 1,000HP so it is very beefy. The Corvette engine also comes with an oil temperature sensor and two knock sensors instead of one.
Note that you can also get iron head LT1's from the Impala SS, Buick Roadmaster and Cadillac Fleetwood. There is also a 265ci "baby LT1" used in some early Caprices.
93: Carryover ECM from earlier model, replaceable chip, OBD-I diagnostics, speed-density programming, batch-fire injectors, unique (only year) fuel rail and intake manifold configuration, no controls for "electronic" tranny (car came with 4L60 = 700R4, or a T56 with no "skip shift, lower first gear ratios and lower torque rating than later years), AIR pump mounted on body, not engine, unique AIR and EGR plumbing, DTC codes can be flashed with a paper-clip, GM "pink" connecting rods, unique throttle body because of need for TV cable for 4L60.
94: New PCM, with fixed chip (must be flash programmed), OBD-I diagnostics, mass-air programming, full sequential injectors with revised intake manifold to accept front cross-over pipe between rails, PCM controls 4L60E automatic, or skip-shift for T56, AIR pump moved to front of engine, EGR and AIR plumbing revised, later 94 and 95 up switched to PM (powder metallurgy) rods.
95: Mostly carryover from 94, but OptiSpark distributor had added vent system and slightly revised internals. Watch out for "CA emissions" A4 models... they had dual-cat exhaust and revised PCM programming. PVC system routing was revised.
96: OBD-II diagnostics added, including more rigorous monitoring of EGR, AIR, EEC systems, and after-cat O2 sensors added for monitoring cat efficiency, crank position sensor added for misfire detection, head design revised slightly, making the walls thinner. All cars were dual cat.
97: Pretty much a carry-over from 96. There were over 100 SS's and something like 27 Firehawks built with the LT4 engine.
Cam differences:
For details of the internal differences, try this article:
Rebuilding the LT1
Or read this book:
How to Rebuild the LT1/LT4Fred
381ci all-forged stroker - 10.8:1 - CNC LT4 heads/intake - CC solid roller - MoTeC engine management - 8 LS1 coils - 58mm TB - 78# injectors - 300-shot dry nitrous - TH400 - Gear Vendor O/D - Strange 12-bolt - 4.11's - AS&M headers - duals - Corbeau seat - AutoMeter gauges - roll bar - Spohn suspension - QA1 shocks - a few other odds 'n ends. 800HP/800lb-ft at the flywheel, on a 300-shot. 11.5 @ 117MPH straight motor
Comment
-
There's a thread on the LT1 board at CamaroZ28.com that has hundreds of posts pointing out the unique features of the 1993's.Fred
381ci all-forged stroker - 10.8:1 - CNC LT4 heads/intake - CC solid roller - MoTeC engine management - 8 LS1 coils - 58mm TB - 78# injectors - 300-shot dry nitrous - TH400 - Gear Vendor O/D - Strange 12-bolt - 4.11's - AS&M headers - duals - Corbeau seat - AutoMeter gauges - roll bar - Spohn suspension - QA1 shocks - a few other odds 'n ends. 800HP/800lb-ft at the flywheel, on a 300-shot. 11.5 @ 117MPH straight motor
Comment
-
Originally posted by Joe 1320
As far as what's the best? Opinion...... the vette has 4 bolt mains so that is a little stronger if you go with power adders, aluminum heads are nice, but the iron heads from the b-body aren't that bad either. A little less HP, but still the same torque.'77 K5 rock-crawler project
'79 T/A: WS6, 400 4sp, 40K miles; Completely stock and original
'87 Lifted 3/4 ton Suburban (Big Blue) plow truck
'94 Roadmaster Wagon (The Roadmonster) 200,000 miles and still going
'97 T/A: (SLP 1LE Suspension, SB, & sfc(s), Loudmouth); 4.10s; B&M Ripper; R/A Hood; ZR1s
My daily drivers: '06 Jeep Liberty CRD (wife); '01 Yukon Denali XL (me); '03 Stratus Coupe (me)
I predict future happiness for Americans if they can prevent the government from wasting the labors of the people under the pretense of taking care of them.
Thomas Jefferson
Comment
-
fastTa
Originally posted by nochopsticks
my budy does porting on them he just did the heads on a storker 408 and he did his heads on a 429 king cobra jet hemi ( 1800 rwhp ) lol hes going to 3000 next year. Hes going to help me do the motor.
Comment
Comment