1980 LG4???

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1980 LG4??? - 7/5/2007 10:38:52 AM    LT4Dave Posts: 53 Joined: 10/9/2006 Status: offline I am lookin' for a 80-82 C3 to tinker with and drive pretty much daily. Noticed 1980 LG4 had miniscule 305ci engine. only ten hp less than 350ci base. I have seen a coulple of them for very reasonable price. Any experiance with this model. Engine upgrades etc. Was california model only that year. Thanks Dave. Thumbnail Image Attachment (1) _____________________________ Bone stock no mo!!!! Post #: 1

RE: 1980 LG4??? - 7/5/2007 10:51:21 AM    wrwalke Posts: 385 Joined: 11/1/2005 Status: offline The 305 is basically the same as the 350, same stroke (3.48"), but with a smaller bore (3.74 versus 4.00").  Most of the other important pieces (carbs, motor mounts, distributor, etc.) will fit just fine between the two, with the obvious exception of heads.  Thicker cylinder walls are a good thing, I've seen a ton of them used in boats, trucks, and other "high stress" uses.  The only bad thing with the 305 was that GM used some crappy OEM heads for it.  Not sure if you could find anything with decent flow... bill. (in reply to LT4Dave) Post #: 2

RE: 1980 LG4??? - 7/6/2007 5:36:39 AM    78buckshot   Posts: 654 Joined: 1/28/2007 From: Michigan Status: offline The 305 was used in those years because the 350 couldn't meet California emissions. If you want to keep the 305 you can bolt on high performance goodies from any of the speed shop suppliers. If your not concerned about keeping it stock, I would drop in a crate motor, any motor based on the Chevy small block will bolt right up. (in reply to wrwalke) Post #: 3

RE: 1980 LG4??? - 7/6/2007 6:17:17 AM    C3 Starship Posts: 4761 Joined: 7/25/2006 Status: offline You can go for a big block, but let me prepare ya. It will bolt right up, but you'll have some small issues with waterpump, crank pulley, and oil pan. I'm in the last stages of a 454 transplant in my '80, but hey, it's all good.  I can't wait for the first fire up. _____________________________ 1980 L-82 Fastback (forward too) Mono composite front and rear. Full adjust ride height and response. 400+ hp, 454, M-22, 3.07 http://i121.photobucket.com/albums/o225/C3Starship/Patch.jpg 2007 H. D. Sportster, XL 883 EFI (in reply to 78buckshot) Post #: 4

RE: 1980 LG4??? - 7/6/2007 6:31:07 AM    78buckshot   Posts: 654 Joined: 1/28/2007 From: Michigan Status: offline Mornin' Dave, you still workin' on the crank pulley issue?, ya' got everything else ready to rock-n-roll? (in reply to C3 Starship) Post #: 5

RE: 1980 LG4??? - 7/6/2007 5:35:50 PM    C3 Starship Posts: 4761 Joined: 7/25/2006 Status: offline Go to my post and I'll update ya. _____________________________ 1980 L-82 Fastback (forward too) Mono composite front and rear. Full adjust ride height and response. 400+ hp, 454, M-22, 3.07 http://i121.photobucket.com/albums/o225/C3Starship/Patch.jpg 2007 H. D. Sportster, XL 883 EFI (in reply to 78buckshot) Post #: 6

RE: 1980 LG4??? - 7/14/2007 3:36:12 AM    LT4Dave Posts: 53 Joined: 10/9/2006 Status: offline Thanks for all the info! Lt4 is up and runnin like a scared jack rabbit. I am in california. Do any of you guys know if there are problems with smog requirments for 1980-1982 models? I am assuming that all stock models can pass smog in CA. Thanks Dave Thumbnail Image Attachment (1) _____________________________ Bone stock no mo!!!! (in reply to C3 Starship) Post #: 7

RE: 1980 LG4??? - 7/17/2007 1:22:27 PM    73shark Posts: 1097 Joined: 4/18/2006 Status: offline Not sure but thought I saw where after a certain age, a car is exempt in CA.  Might just be wishful thinking tho. _____________________________ So many toys, so little time (in reply to LT4Dave) Post #: 8

RE: 1980 LG4??? - 7/18/2007 11:47:27 AM    LT4Dave Posts: 53 Joined: 10/9/2006 Status: offline All vehicles 1975 or older are exempt in CA. In 1980 only the LG4 was legal in CA. There was an L82 model at 230hp and They were not legal here that year. I'm curious If that L82 model is legal now. I see them for sale on ebay. Some in CA. Anyone know for sure? Dave _____________________________ Bone stock no mo!!!! (in reply to 73shark) Post #: 9

RE: 1980 LG4??? - 7/28/2007 8:27:03 PM    Texas Jim   Posts: 445 Joined: 12/15/2005 Status: offline Yes, that LG4 was the forerunner of the '81 350, the "closed loop" system w/ the CCM.  It may  burn cleaner, but the freakin' gas mileage is hurtin', especially for the amount of HP it puts out.  I've had afew 305s, not in 'Vettes, and I'd keep on lookin' unless you get it cheep enough where you can put a good engine in it and not have over spent way up past what the car is really worth.  I have to say that the 305 isn't a 'Vette worthy engine.  Only my opinion.  I'm one who was "really sick" when the polution pumps came out in '72 and all the small block chevys lost 75 or 100 HP. (in reply to LT4Dave) Post #: 10

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