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Hey Guys,
VTHokie77Vette 2007-01-21 09:33:42
I was wondering what the compression ratio is for the 1977 L-48. I'm probably going to sell the Jasper remanufactured engine I have to somebody and I'd like to be able to tell them what it is. I could only find 9.0:1 for the L-82. Was it 8.5:1 for the L-48?? Thanks!
1977 Corvette EX-L48
383 Stroker, Holley MPFI, MSD Ignition, BTO 700R4, VBP Street/Slalom, Hooker Sidepipes with JCL Spiral Baffles, Corbeau A4s w/ Shark Bar and Simpson 5-Points, 17" AR TTII's, Kumho MX's
(click to see a bigger version)
383 Stroker, Holley MPFI, MSD Ignition, BTO 700R4, VBP Street/Slalom, Hooker Sidepipes with JCL Spiral Baffles, Corbeau A4s w/ Shark Bar and Simpson 5-Points, 17" AR TTII's, Kumho MX's
(click to see a bigger version)
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Send PMFrederick, MD - USA
Joined: 9/8/2003
Posts: 3398
Vette(s): 1969 convertible L71 427/435 4-speed black interior
The literature I have says 8.5 to 1.
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Duncanville, TX - USA
Joined: 11/8/2003
Posts: 22720
Vette(s): #1-1974 L-48 4spd Cp Med Red Metallic/Black deluxe int w/AC/tilt/tele./p/w-p/b/
Am-Fm/map light National/Regional/Chapter NCRS "Top Flight"
#2-1985 Bright Red/Carmine Cp.L-98/auto
Member: NCRS, NCRS Texas, Corvette Legends of Texas
That would be the factory rating. If the engine has been rebuilt, who knows what it has? A larger bore, different pistons, or different heads will change the comp. ratio. As far as you know, it should be 8.5:1, and that's really all you could tell anyone. 
Joel Adams
C3VR Lifetime Member #56 
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"Money can't buy happiness -- but somehow it's more comforting to cry in a CORVETTE than in a Kia"
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I've got an L48 and my ratio is currently 10:1! As Joel said, it depends how much work has been done. I have shaved heads and high comp pistons.
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Thanks guys. Talking to Jasper years ago they were supposed to be giving me an engine built to the exact specs of the L-48 so I'll tell him its supposed to be 8.5:1...haha. Thanks again!
1977 Corvette EX-L48
383 Stroker, Holley MPFI, MSD Ignition, BTO 700R4, VBP Street/Slalom, Hooker Sidepipes with JCL Spiral Baffles, Corbeau A4s w/ Shark Bar and Simpson 5-Points, 17" AR TTII's, Kumho MX's
(click to see a bigger version)
383 Stroker, Holley MPFI, MSD Ignition, BTO 700R4, VBP Street/Slalom, Hooker Sidepipes with JCL Spiral Baffles, Corbeau A4s w/ Shark Bar and Simpson 5-Points, 17" AR TTII's, Kumho MX's
(click to see a bigger version)
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Are any of you with hi lift, long duration, cams ,hi comp. motors having any vacuum problems?
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Duncanville, TX - USA
Joined: 11/8/2003
Posts: 22720
Vette(s): #1-1974 L-48 4spd Cp Med Red Metallic/Black deluxe int w/AC/tilt/tele./p/w-p/b/
Am-Fm/map light National/Regional/Chapter NCRS "Top Flight"
#2-1985 Bright Red/Carmine Cp.L-98/auto
Member: NCRS, NCRS Texas, Corvette Legends of Texas
It's the long duration specs that kill vacuum. Anything above around 260-270degs will not allow very much vac. to be made. 
Joel Adams
C3VR Lifetime Member #56
My Link
(click for Texas-sized view!) NCRS
"Money can't buy happiness -- but somehow it's more comforting to cry in a CORVETTE than in a Kia"
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thanks Joel
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in Forum: C3 Engines, Driveline and Handling
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