Need Tech Help on L82
Thread Starter
Intermediate
Joined: May 2002
Posts: 40
Likes: 0
From: Chesapeake VA
Need Tech Help on L81 specs
Does anyone know what the cc's of the stock cyl head combustion chambers are?
I wanna swap to Aluminum GMPP fastburn heads and wanna know how they will change my compression with a 64cc chamber
thanx in advance
-Joe
Red '81
[Modified by obelisk, 3:28 AM 5/16/2002]
I wanna swap to Aluminum GMPP fastburn heads and wanna know how they will change my compression with a 64cc chamber
thanx in advance
-Joe
Red '81
[Modified by obelisk, 3:28 AM 5/16/2002]
Thread Starter
Intermediate
Joined: May 2002
Posts: 40
Likes: 0
From: Chesapeake VA
Re: Need Tech Help on L81 specs (obelisk)
sorry if this question is stupid I just bought my vette 2 weeks ago... I don't know much about em yet... any help would be appreciated
-joe
-joe
Drifting
Joined: Oct 2000
Posts: 1,825
Likes: 56
From: Shawano WI
Re: Need Tech Help on L81 specs (obelisk)
L82's were not available in 81 so I will asume that you have the 190HP base motor that was the only one available in 81. That motor had 8.2-1 compression with 76cc chamber heads and a shim head gasket (approx .016). If you us the Fast Burn head (PN# 12464298) with 62cc chamber and a composite head gasket (approx .038) you will end up with 8.97-1 compression.
Drifting
Joined: May 2000
Posts: 1,478
Likes: 38
From: Long Island NY
Re: Need Tech Help on L81 specs (obelisk)
Joe, Welcome to the CF!!
I'll try to answer your question.
From the GM Restoration Manual. Combustion chamber volume offered in cu. in. only. For a 1980 L48....5.94cu.in. For a 1980 L82....5.47cu.in.
Hope this helps. L8TER, Paul.
I'll try to answer your question.
From the GM Restoration Manual. Combustion chamber volume offered in cu. in. only. For a 1980 L48....5.94cu.in. For a 1980 L82....5.47cu.in.
Hope this helps. L8TER, Paul.
Thread Starter
Intermediate
Joined: May 2002
Posts: 40
Likes: 0
From: Chesapeake VA
Re: Need Tech Help on L81 specs (Pete79L82)
thanx pete, I misstyped the L82 I did mean L81 I tried to edit the post but I guess it didn't work.... go figure. Thanx for the compression conversion.
-Joe
-Joe
Drifting
Joined: Mar 2001
Posts: 1,514
Likes: 1
Re: Need Tech Help on L81 specs (Pete79L82)
I think your safe to assume you have 76cc heads. Welcome to the forum.
Not a stupid question by any means, if you ever have the valve covers off the casting number would give a definitive answer.
Scott
Not a stupid question by any means, if you ever have the valve covers off the casting number would give a definitive answer.
Scott
Thread Starter
Intermediate
Joined: May 2002
Posts: 40
Likes: 0
From: Chesapeake VA
Re: Need Tech Help on L81 specs (Scott78)
Thanx again for the help guys. I'm still new to the 350 engine I just upgraded to the vette from my '00 Sunfire. A v8 is a whole new world for me.
-Joe
-Joe
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