hicswa

What are the specs for a 1975 L48 cam, and where can I buy a new stock cam or a direct replcement?

Thanks,
Danny

Durango_Boy

Oreilly Auto Parts

Melling brand
$44.99

mr303

You may want to upgrade to something a little better, the L48 cam is not very good.

Gordonm

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.

ruby76

at the very least I'd go with a stock L82 cam.

jackson

Melling p/n CCS-2
adv dur 260*In/271*Ex
0.050" dur 194*/203*
cam lift .260"/.273"
valve lift .390"/.410"

also:
Clevite p/n 229-1274
Sealed Power p/n CS-274

mr303

with ruby76

wfo76

Or go with the L79 327/350hp or "151" cam

.447/.447 lift
222/222 dur
114 lsa

Comp Cams #12-106-3


If you still want to stay stock L48, the Comp # is 12-105-3

hicswa

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.

Little Mouse

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.

Gordonm

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.

Little Mouse

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

mr303

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!

SteveG75

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.

hicswa

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

dgruenke

It has different pistons and a forged crank. The pistons give it the higher CR. The cam is also larger, as you already noted.

DRIVESHAFT

That would be a good choice IMO

jackson

I thought you wanted a replacement L48 cam ... but ...

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.

BigBlockk

You need to listen to the Mouse. You have a low compression engine. If you put a big cam in it you will be disappointed. The L-82 had more compression and more camshaft. If you put an L-82 cam in an L-48 you will be disappointed. If you want to use a bigger camshaft you need to raise the compression ratio.

BigBlockk

Later.....

Little Mouse

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.