1975 cam
Race Director
Joined: Dec 1999
Posts: 19,610
Likes: 778
From: Forked River NJ
You can buy a stock or replacement cam for your motor but why. There are a ton of aftermarket cams from extremly mild to wild tha tare a better cam than the L48 cam. That has to be one ofthe mildest cams ever put into a small block. Even ifyou go with an aftermarket mild cam it will provide a little more power than the stock one.
Le Mans Master
Joined: Sep 2001
Posts: 7,739
Likes: 630
From: Unreconstructed, South Carolina
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Thread Starter
Pro
Joined: Sep 2006
Posts: 547
Likes: 13
From: Carlstadt NJ
Thanks for the reply. If I go with a better cam what else will I need to do? Bigger valve spring....ect. What would be a better cam for my car without modifying everthing else to satify the cam? I'm all up for more HP just don't know enough about upgrading with a better cam.
Le Mans Master
Joined: Apr 2006
Posts: 5,403
Likes: 95
Go a little milder then the 224. .050 L/82 cam. L/82 has a little more
compression then your L/48 with its flat top pistons. I had 3.73
rear gears a 4 Speed in my 78 L/82 it did not have any torque below 2500 RPM. I ordered the L/82 new in 78 most disapointing car I ever owned no torque below 2500 and when it did get into the cam range there still was not much for power.
compression then your L/48 with its flat top pistons. I had 3.73
rear gears a 4 Speed in my 78 L/82 it did not have any torque below 2500 RPM. I ordered the L/82 new in 78 most disapointing car I ever owned no torque below 2500 and when it did get into the cam range there still was not much for power.
Last edited by Little Mouse; Nov 27, 2007 at 06:03 PM.
Race Director
Joined: Dec 1999
Posts: 19,610
Likes: 778
From: Forked River NJ
You need to change the springs anyway so you might as well get a good set. With the compression you have something in the 215 to 220 @ .050 range and a lift of around .450 to .470 would wake up the L48. The heads are alos a weak point inthe L48. A cam with a good free flowing exhaust will give you good power from your stock combo.
Le Mans Master
Joined: Apr 2006
Posts: 5,403
Likes: 95
You have a heavy weight 75 probably 3.08s maybe only a 3 speed
auto no compression to work with, you need to stay with some help in the torque departent, stay away from the midrange HP cams, look for a cam in the
210/215 range, that will give you a little more mid range then your
195 .050 L/48 cam but it won't wipe out your torque down low.
Cam and Lifters # LUN-60101LK
www.summitracing .com
auto no compression to work with, you need to stay with some help in the torque departent, stay away from the midrange HP cams, look for a cam in the
210/215 range, that will give you a little more mid range then your
195 .050 L/48 cam but it won't wipe out your torque down low.
Cam and Lifters # LUN-60101LK
www.summitracing .com
Last edited by Little Mouse; Nov 27, 2007 at 06:48 PM.
Racer
Joined: Aug 2006
Posts: 330
Likes: 3
From: Wellington, New Zealand
Put in a better cam and some new lifters, check the timing chain while your doing it and leave the rest alone! Otherwise you will be up to your eyeballs in a complete rebuild before you know it!
Race Director
Joined: Jun 2000
Posts: 10,045
Likes: 675
From: FL
I put a Crane Powermax 272 in my L48 back in 2001.
216/228 @.050 .454"/.480" lift, 112 LSA. Worked fine with stock heads and springs. Really woke the engine up. One of the best mods I ever did on the old engine. 1800-5600 rpm range works well with the stock bottom end.
Now, I am spending way too much on engine parts.
216/228 @.050 .454"/.480" lift, 112 LSA. Worked fine with stock heads and springs. Really woke the engine up. One of the best mods I ever did on the old engine. 1800-5600 rpm range works well with the stock bottom end.
Now, I am spending way too much on engine parts.
Thread Starter
Pro
Joined: Sep 2006
Posts: 547
Likes: 13
From: Carlstadt NJ
Thanks! So than what is the differance between the L48 and L82? I know the cam and compression is differance but what esle? I know they used the same block. Is the pistions, heads....crank the same as the l48? What did they do to make an L82 engine?
Thanks Danny
Thanks Danny
Drifting
Joined: Apr 2002
Posts: 1,716
Likes: 4
From: New Baden Illinois
It has different pistons and a forged crank. The pistons give it the higher CR. The cam is also larger, as you already noted.
Drifting
Joined: Aug 2005
Posts: 1,682
Likes: 3
From: League City TX
I put a Crane Powermax 272 in my L48 back in 2001.
216/228 @.050 .454"/.480" lift, 112 LSA. Worked fine with stock heads and springs. Really woke the engine up. One of the best mods I ever did on the old engine. 1800-5600 rpm range works well with the stock bottom end.
Now, I am spending way too much on engine parts.
216/228 @.050 .454"/.480" lift, 112 LSA. Worked fine with stock heads and springs. Really woke the engine up. One of the best mods I ever did on the old engine. 1800-5600 rpm range works well with the stock bottom end.
Now, I am spending way too much on engine parts.
That would be a good choice IMO
Le Mans Master
Joined: Sep 2001
Posts: 7,739
Likes: 630
From: Unreconstructed, South Carolina
If you want an upgrade for otherwise stock '75 L48 ... it's hard to beat value & performance of Summit's cam & lifter kit p/n SUM-K1103 (214*/224* .442"/.465" ) at about $90/kit. Also ... Free-flowing / true dual exhaust alone will help alot.
Drifting
Joined: Sep 2004
Posts: 1,959
Likes: 1
From: North Bend Ohio
BigBlockk
Later.....
Le Mans Master
Joined: Apr 2006
Posts: 5,403
Likes: 95
L/48, two bolt main block, cast iron crank, cast dished pistons,.
76cc heads with 194/150 valves, 194 at .050 cam.
L/82, four bolt main block, steel forged crank, forged flat top pistons,
76cc heads with 202/160 valves, 224 at .050 cam.
If you can afford them a set of at least 64cc chamber modern heads
would really help you. but even with the better compression and
better breathing heads, if you have 3.08 gearing, 3 speed auto,
you would still be better off with a below 220 at .050 cam.
76cc heads with 194/150 valves, 194 at .050 cam.
L/82, four bolt main block, steel forged crank, forged flat top pistons,
76cc heads with 202/160 valves, 224 at .050 cam.
If you can afford them a set of at least 64cc chamber modern heads
would really help you. but even with the better compression and
better breathing heads, if you have 3.08 gearing, 3 speed auto,
you would still be better off with a below 220 at .050 cam.