different tbi 350s - Chevy Impala SS Forum
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post #1 of 11 (permalink) Old 09-26-2005, 03:41 PM
305ss
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were the regular caprice L05s different from 9c1 L05s? what about truck and van L05s?
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post #2 of 11 (permalink) Old 09-26-2005, 04:20 PM
jayoldschool
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Off the top of my head: different cams. Perhaps different injectors?
post #3 of 11 (permalink) Old 09-26-2005, 06:10 PM
95 9c1 Lt1
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the bubble 9c1 350 had diff cam, injectors, pcm tune, bigger Y pipe
no idea on the trucks but I figure diff cam and pcm tune
 
post #4 of 11 (permalink) Old 09-26-2005, 11:47 PM
deanstud
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Non 9C1 L05s are NON roller motors.

The bigger Y pipe was only 92-93.
post #5 of 11 (permalink) Old 09-27-2005, 07:03 AM
jayoldschool
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Quote:
Non 9C1 L05s are NON roller motors
Really? More info please. I thought that post 88 they were all rollers. So my 92 RMW L05 has a flat tappet? Am I confusing the 1pc rear seal switch (or perhaps the intake bolt angle switch). Too much damn SB history to keep track of.
post #6 of 11 (permalink) Old 09-27-2005, 08:30 AM
PaulD
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Just trucks kept the flat followers/tappets. Automobiles are rollers. For an L05, it all depends what it came out of.
Other differences are those mentioned, slightly bigger injectors and PCM adjustments, and 'bigger' cam are the ones I'm aware of. If I've missed something, I'm sure KRolt will tell us.
post #7 of 11 (permalink) Old 09-27-2005, 10:45 AM
mass9c1
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The L03 & L05 model motor was a hydraulic roller motor, unless it was in a truck.

The bigger Y-pipe was only on the 9C1 I might add.

Also the 9c1's had 65lb/hr injectors while the truck motors and regular L05's got the 55lb/hr, the L03 got the 45lb/hr. The only difference was the 454 of that same era as it got the 2" TBI and I believe 85lb/hr injectors.

The PCM tune was the same for all 91-93 TBI's, it only varied because of the type of injectors the motor had and the 9C1 "tune" had the speed limiter removed and also added the Wide Open Throttle A/C cut off. Also depending on the model Caprice the speedometer was set different to accomodate different sized "stock" tires.
post #8 of 11 (permalink) Old 09-27-2005, 04:34 PM
cletus284
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SOME truck L05's have 4-bolt mains. ALL B-Body L05's got 2-bolt mains.
post #9 of 11 (permalink) Old 09-28-2005, 04:44 AM
kdrolt
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mass9c1 is correct. cars with TBI v8 (both 305 & 350) had roller hyd cams; trucks with TBI v8 got flat tappet hyd cam.

Only the 9C1 350 got the larger exh Ypipe; it also got the L98 cam, 65 lb/hr injectors and the revised calibration in the ECM to suit the cam + exhaust, so it got rated at 190, 195 or 205 fwhp (in 1989-90, 91, and 92-93 respectively). The civilian TBI 350 was always 180 fwhp.

Trucks, OTOH, got a lower-restriction louder exhaust and a cam that was not as large as the L98 cam, but it was also larger than the std 305 or civilian 350 cam... so they were rated at up to 210 fwhp in their last year in light trucks/vans (1995). Trucks usually had lower CR than the car engines, and that was done IIRC by having dished piston crowns. The heads should eb the same swirl port heads used on the cars. Trucks probably had 4 bolt mains but that doesn't help power at all.

There were also some slight differences in the truck TBI units, vs the ones used on cars, because some of the fleet-type light trucks had built-in speed govenors on them. I think there are example pix on the Thirdgen.org website. HTH.

EDIT: PaulD --- the Championship sod is doing nicely. Maybe there will be a 2nd installation in a month.
post #10 of 11 (permalink) Old 09-29-2005, 06:03 PM
Bow Tie Guy
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I was trying to figure it out at scoggin dickeys
site no help really

see for yourself it says flat tappets for LT1
B's & LO5 B's etc
http://www.sdpc2000.com/catalog/123/...ch-Engines.htm
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