cam recommendation for ´80 Corvette
Thread Starter
Burning Brakes
Joined: Nov 2000
Posts: 810
Likes: 4
From: Austria
cam recommendation for ´80 Corvette
Hi all
i´m about to rebuild the engine of a ´80 Corvette from a friend of mine,..
he uses this car only for shows, so he want an engine with a bit lope to it..
can anybody give me the specs of the stock cam?
also, i will take of a bit of the heads, i think about .02" to increase compression..
would you like this cam?
http://store.summitracing.com/egnsea...=KeywordSearch
thank you
i´m about to rebuild the engine of a ´80 Corvette from a friend of mine,..
he uses this car only for shows, so he want an engine with a bit lope to it..
can anybody give me the specs of the stock cam?
also, i will take of a bit of the heads, i think about .02" to increase compression..
would you like this cam?
http://store.summitracing.com/egnsea...=KeywordSearch
thank you
Pro
Joined: Apr 2005
Posts: 591
Likes: 7
From: Batavia IL
have you checked out compcams new thumper cams? since your friend is only concerned with the sound and not actual performance those sound like the best deal. they are designed for aggressive sound but not actually move your power band up much. definitly not my cup of tea though, I want more power always.
Le Mans Master
Joined: Apr 2006
Posts: 5,403
Likes: 95
Hi all
i´m about to rebuild the engine of a ´80 Corvette from a friend of mine,..
he uses this car only for shows, so he want an engine with a bit lope to it..
can anybody give me the specs of the stock cam?
also, i will take of a bit of the heads, i think about .02" to increase compression..
would you like this cam?
http://store.summitracing.com/egnsea...=KeywordSearch
thank you
i´m about to rebuild the engine of a ´80 Corvette from a friend of mine,..
he uses this car only for shows, so he want an engine with a bit lope to it..
can anybody give me the specs of the stock cam?
also, i will take of a bit of the heads, i think about .02" to increase compression..
would you like this cam?
http://store.summitracing.com/egnsea...=KeywordSearch
thank you
the 80 vette and give a performance boost, but with 112 LSA
and a short duration I'm not sure it would give enough of the
rumpity rump exhaust he wants. find a cam with a simular .050
intake duration and a little tighter LSA like 110 for some more
rumpity rump.
If your going to rebuild it with new pistons and it has dished pistons
in it now use a flat top piston and a thin head gasket. or deck the
block instead of cutting on the heads.
Last edited by Little Mouse; Mar 4, 2007 at 11:06 PM.
Thread Starter
Burning Brakes
Joined: Nov 2000
Posts: 810
Likes: 4
From: Austria
Hi all and thanks for your replies..
the whole rebuild is a bit of budget, so the rotating assembly will stay the same..
what i will do is mill the heads, and use thin head gaskets, to get some compression..after i have determined the compression, i will shop a cam...
what is the stock compression of this engine?
how much compression will i gain with reasonable milling?
thank you
the whole rebuild is a bit of budget, so the rotating assembly will stay the same..
what i will do is mill the heads, and use thin head gaskets, to get some compression..after i have determined the compression, i will shop a cam...
what is the stock compression of this engine?
how much compression will i gain with reasonable milling?
thank you
Burning Brakes
Joined: Jul 2006
Posts: 830
Likes: 1
I've got an 80 with a slight cam, alum intake & performer carb. With the Tri-Y headers & true duals it runs and sounds awesome. ps It can happily spin the tires at a stand still (no power brakin' here 
) and chirps going into second gear (this is an automatic too btw).
I wouldn't go too deep with the cam for a few reasons, yes, the lumpy sound is neat but these cars are so heavily run by vacuum the lumpy cam could/would adversely affect lights, heater/defrost & street-ability that it might just be a pain in the rear.
BUT...That's just my opinion & I'm sure it could get flamed
& someone could happily suggest otherwise. Best of luck!
) and chirps going into second gear (this is an automatic too btw).I wouldn't go too deep with the cam for a few reasons, yes, the lumpy sound is neat but these cars are so heavily run by vacuum the lumpy cam could/would adversely affect lights, heater/defrost & street-ability that it might just be a pain in the rear.
BUT...That's just my opinion & I'm sure it could get flamed
& someone could happily suggest otherwise. Best of luck!
Le Mans Master
Joined: Sep 2001
Posts: 7,739
Likes: 630
From: Unreconstructed, South Carolina
OE L48 cam Approx ... about ... 0.050" dur 194*/204*, .390"/.410" valve lift.
OE L48 static compression approx ... about ... 7.8:1 .
Summit 1103 is the one I'd pick for this too ... any more & the low compression (even w/ head cut & thin gasket) may not do well in traffic. Do install fresh replacement-type Vsprings ... they're cheap.
Plain (replacement-grade) flattop pistons are under $100/set of 8 here in USA. Going too cheap & reusing dish may be false economy.
Stock chamber about 75cc-76cc ... Head cut 0.020" will drop about 3cc. WARNING: any more cut & you might run into intake manifold fit ... especially if stock cast iron intake.
FelPro #1094 thin head gasket (0.015" x 3.2cc) is a good choice for iron heads.
Accurate & handy static compression calculator:
http://www.21cgt.com/FMWebCatalog/frmConversion4.aspx
OE L48 static compression approx ... about ... 7.8:1 .
Summit 1103 is the one I'd pick for this too ... any more & the low compression (even w/ head cut & thin gasket) may not do well in traffic. Do install fresh replacement-type Vsprings ... they're cheap.
Plain (replacement-grade) flattop pistons are under $100/set of 8 here in USA. Going too cheap & reusing dish may be false economy.
Stock chamber about 75cc-76cc ... Head cut 0.020" will drop about 3cc. WARNING: any more cut & you might run into intake manifold fit ... especially if stock cast iron intake.
FelPro #1094 thin head gasket (0.015" x 3.2cc) is a good choice for iron heads.
Accurate & handy static compression calculator:
http://www.21cgt.com/FMWebCatalog/frmConversion4.aspx
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Race Director
Joined: Nov 2002
Posts: 12,142
Likes: 54
From: Taylor Michigan
The mid 60`s hydraulic 327 ci 350 HP cam is a very good one. More commonly refered to as the GM 151 camshaft. It will liven up any stock SB engine with not much more than a good set of valve springs.
Thread Starter
Burning Brakes
Joined: Nov 2000
Posts: 810
Likes: 4
From: Austria
thank you for all your answers...
maybe new pistons are on the list..i will talk with my friend, how much he is willing to spend...
are the stock pistons dished? i also think, the piston pin is pressed....so, it wouldn´t be easy to remove/reassemble the pistons..?
i will use the Felpro 1094 you mentioned, i used them also in my engine, and they are fine, also i will use new Valvesprings..ys, its budget, but i want him to get a good running engine...
i have the possibility to use full CNC engines, so i would also be able to angle mill the heads..
is there a formula to calculate this?
Thank you
maybe new pistons are on the list..i will talk with my friend, how much he is willing to spend...
are the stock pistons dished? i also think, the piston pin is pressed....so, it wouldn´t be easy to remove/reassemble the pistons..?
i will use the Felpro 1094 you mentioned, i used them also in my engine, and they are fine, also i will use new Valvesprings..ys, its budget, but i want him to get a good running engine...
i have the possibility to use full CNC engines, so i would also be able to angle mill the heads..
is there a formula to calculate this?
Thank you
Drifting
Joined: Jul 1999
Posts: 1,542
Likes: 43
From: Plano TX
I have an 80 L82 and found the best approach for me was a ZZ4 crate motor which gave me higher compression and a nice roller cam. However from your need to limit the budget I'd try to do the following if the bottom end is very sound and the rings pass a leakdown test.
The stock heads are old tech and not worth the effort. Not sure how hard they would be to find, but I'd try to source the L98 aluminum heads which flow much better than the current heads and raise compression with no bottom end changes (heads are reasonably cheap on used market in US). A roller cam is out of your budget so I'd then go with a flat tappet cam better suited to those heads.
The stock heads are old tech and not worth the effort. Not sure how hard they would be to find, but I'd try to source the L98 aluminum heads which flow much better than the current heads and raise compression with no bottom end changes (heads are reasonably cheap on used market in US). A roller cam is out of your budget so I'd then go with a flat tappet cam better suited to those heads.
Le Mans Master
Joined: Sep 2001
Posts: 7,739
Likes: 630
From: Unreconstructed, South Carolina
L48 pistons are dished ... L82 pistons are flattop.
Yes pins press in/out ... it's not something you do while watching TV ... but it's not hard ... heat the rod small end w/ torch & quickly press.
Angle mill ... now you're really asking for intake manifold fitment issues ... especially if you're planning to do the machinework but have never done it before.
77-up heads are thin lightweight castings and ... when milled ... often do not align well with head gaskets & often end up leaking.
Are you convinced yet? ... unless a light cut to simply level them is required ... don't mill the heads.
Thread Starter
Burning Brakes
Joined: Nov 2000
Posts: 810
Likes: 4
From: Austria
hi all
ok,i talked with my friend, and convinced him to use a set of 113 D-port heads, so compression should went up to about 10:1, so the decision on the cam should be easier..
which cam would you recommend me now?
i turn to something about 220° intake duration..
regards
ok,i talked with my friend, and convinced him to use a set of 113 D-port heads, so compression should went up to about 10:1, so the decision on the cam should be easier..
which cam would you recommend me now?
i turn to something about 220° intake duration..
regards
Le Mans Master
Joined: Sep 2001
Posts: 7,739
Likes: 630
From: Unreconstructed, South Carolina
hi all
ok,i talked with my friend, and convinced him to use a set of 113 D-port heads, so compression should went up to about 10:1, so the decision on the cam should be easier..
which cam would you recommend me now?
i turn to something about 220° intake duration..
regards
ok,i talked with my friend, and convinced him to use a set of 113 D-port heads, so compression should went up to about 10:1, so the decision on the cam should be easier..
which cam would you recommend me now?
i turn to something about 220° intake duration..
regards
0.050" dur = 220°/231°, SAE dur = 304°/287°, Vlift = .468"/.480", ICL = 110°
Similar cam is summit 1105
Thin composition head gasket either:
Victor Reinz P/N 5746 (0.026") ... or
GM P/N 10105117 (0.028").
Pro
Joined: Dec 2005
Posts: 699
Likes: 0
From: Vettemod.com For the C3 People
St. Jude Donor '06
Removed crossfire crap, added comp 268H cam. Very streetable, no vacuum problems, fantastic low end torque. Not sure of HP and torque, but I would guess I added at least 100Hp and 150 torque. Original smog heads, 78CC
Oh, wanna hear it? this is at 700 rpms, it will idle down to 600, I operate at about 800 idle.
http://youtube.com/watch?v=RJ_5NMiDJNA
tt
