1965 Corvette 327/365 hp
05-20-2022, 06:26 PM
#2
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2023 C1 of the Year Finalist - Modified
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30-30 was the cam.
The 365hp/327 was NOT, repeat, NOT the FI engine.
The 375hp/327 was the FI engine and also had the 30-30 cam.
BOTH engines were virtually identical, the 365hp had a Holley carb and the 375hp had the 7017380 FI unit.
The 365hp/327 was NOT, repeat, NOT the FI engine.
The 375hp/327 was the FI engine and also had the 30-30 cam.
BOTH engines were virtually identical, the 365hp had a Holley carb and the 375hp had the 7017380 FI unit.
05-20-2022, 09:08 PM
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The 30/30 cam was short lived as it had poor performance at low rpms and was only used for two years and the replacement cam for it over the counterrevolution was the 1970 LT1 cam.
05-20-2022, 09:22 PM
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05-21-2022, 12:40 PM
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The LT-1 engine was dropped due to tightening emissions regulations and low volume and replaced with the L-82, which was a low compression version of the L-46 with more emission control equipment.
The LT-1 cam replaced the "30-30" cam in service parts not long after the LT-1 engine was introduced, the applications being the 365/375 HP Corvette engines and the 302 Z-28 engine.
The LT-1 cam makes better low end torque than the 30-30 with about the same top end power. The inlet lobe is from the big block SHP cam indexed at 110 deg. ATC on a smaller base circle, and the exhaust lobe is from the 30-30 cam indexed four degrees earlier at 122 deg. BTC. The resulting 116 deg. LSA and eight degree shorter inlet duration reduced the extreme effective overlap of the 30-30 cam to about the same as the Duntov cam.
I'm not sure when the LT-1 cam was discontinured from service parts, but maybe even as late as sometime in the nineties, and it was available from Federal Mogul until a few years ago.
Current replacements are available from Elgin and Howard's Cams.
Duke
The LT-1 cam replaced the "30-30" cam in service parts not long after the LT-1 engine was introduced, the applications being the 365/375 HP Corvette engines and the 302 Z-28 engine.
The LT-1 cam makes better low end torque than the 30-30 with about the same top end power. The inlet lobe is from the big block SHP cam indexed at 110 deg. ATC on a smaller base circle, and the exhaust lobe is from the 30-30 cam indexed four degrees earlier at 122 deg. BTC. The resulting 116 deg. LSA and eight degree shorter inlet duration reduced the extreme effective overlap of the 30-30 cam to about the same as the Duntov cam.
I'm not sure when the LT-1 cam was discontinured from service parts, but maybe even as late as sometime in the nineties, and it was available from Federal Mogul until a few years ago.
Current replacements are available from Elgin and Howard's Cams.
Duke
Last edited by SWCDuke; 05-21-2022 at 12:47 PM.
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