I have a 1977 Vette with the L82 engine that just wiped out. The engine is stock. I have an old crane cam Z cam with lift int 491 -exh 497 with duration 286-294.Will this work without any issues

 

Welcome to the Forum!
Sorry about wiping out your L82. You just mention a cam change so did you just wipe out your cam/lifters?
This is really more of a "hello" section, so I would suggest asking your question in the C3 Tech section at https://www.corvetteforum.com/forums...s-1968-1982-5/.
On the surface that is a lot of cam if the rest of your engine is basically stock. You will only be running 9:1 compression ratio with weak heads and weak induction.
As much info as possible will help members there answer your question. Is the engine all stock? What changes, if any, have been made to intake and exhaust (headers? Newer intake? Newer carb?). Changes to pistons and/or rest of the recep parts (rods, crank, etc). Is your car 4 speed or auto? (You will need to upgrade your torque converter to about 2500+ range).
Undoubtedly, others have made the same basic cam upgrade and could give you better insight into the other changes they made.
Best wishes with your engine work.

 

throw it away, and go full roller,,, or do this again soon////

what hp are you looking for?

cam heads exhaust intake all need to match

And if your having to rebuild the whole motor...... There is no replacement for displacement .... I think you can go to a 396???
Not much price differences,,, you'll have to buy a new crank...

 

With a stock l82 you will want something thats not too extreme unless you are going to upgrade the heads and exhaust. I just converted to a retro roller cam myself for a very reasonable amount of money by using these lifters https://www.rockauto.com/en/moreinfo...4xiAwCfD2Ug%3D For me it was totally worth it. Not only for piece of mind but I also jumped up from a voodoo 262 cam to the comp xr270hr cam. My vacuum is still good and the engine still has great street manners. the only drawback so far is it takes longer to warm up. I do still have a couple flat tappets, a comp 268h cam with lifters and the Lunati vodoo262 with lifters sitting on a shelf in my garage if your looking.. The voodoo cam has less than 7k on it

 

That cam is way too big.
Hit up Auggie for his Comp 268......this would be what I would replace it with.
Rollers are the ****.....but the conversion is over $1000 on a stock L-82 by the time you machine the heads and buy spring, lock, retainers.
Flat tappets are not a pariah......myself and many others run them. It is just the five or so things that HAVE to happen to make it successful.......in 15 years, I bet I have put in over 20 flat tappet cams in different cars.....not just Chevrolet's either.....with no issues. But if you just want to start it and go.....nothing beats a roller. The other thing is that a roller is about worthless for power with the stock heads. A lot of money for about zero performance upgrade over a flat tappet on a stock head. The Comp 268 will go right to the limit of the stock heads easily for flow.
If you wiped a cam though.....the oil pan has to come off and a bunch of other things checked to determine if you can proceed with just sticking another cam in it......

Jebby

 

This situation usually results in the "while im at it" syndrome, resulting in replacing the restrictive stock heads. As Jebby mentioned, with stock heads the roller cam is not worth it.. On the other hand, if you replace those heads with something like even a low budget better flowing vortec head upgrade, The roller cam starts to be a feasible upgrade even though the benefits are small by comparision to the heads themselves.
a replacement flat tappet is the most cost effective way to go though unless you want to go down the rabbit hole of upgrades to the L82.

 

Good evening Augie,
You say you have the xr270hr camshaft. Does she sound a little choppy? I currently have the xe268 camshaft and she sounded pretty decent until one of the lobes got rounded. I am thinking of upgrading to either xr270 or xr276, but I want something that sounds mean while at low idle. I have . Does your car idle low or does she idle at about 950-1000 rpms?

 

That cam you have is too big for the stock L82.

Replacing it with another L82 cam is an easy option. It lasted over 40 years so maybe it gave you your money's worth. Do a very careful break-in with GM engine oil supplement (find it). Use a molybdenum disulfide lube on the lobes like Isky Rev Lube. Use a high zinc conventional motor oil like Valvoline Racing 10W-30.

Aftermarket cam choice would be a Comp High Energy 268H. It was designed to work in this application.

Whatever you do, replace the plastic toothed cam timing set if you still have it on there.

 

The xr270hr does have just a bit more of a rough idle which sounds better IMO but honestly its still a pretty good idle at 700-750 when warmed up and theres plenty of vacuum I have noticed more overall power at al speeds including lower rpms where I was concerned id be trading it off for more top end.
The one thing I have noticed that im not thrilled with is that it does take longer for the engine to idle strong and not stall at the first stop sign next to my house... warmup time was almost instantaneous with my voodoo 262/268 cam, now its a solid 5 minutes in the driveway.

 

i run a custom cam grind cam…lift of 611/592 duration @50/ 244/248 109 Sep
in a 427sbc 11.3cr and AFR 220 competition ported heads and idle is nice when warmed up at 750 RPM


the voodoo cam is a RV cam
and @ .050 it’s (Int/Exh): 219/227… small cam


Hydraulic. Mid-level performance street cam with excellent drivability. Exceptional replacement for muscle car type cams with automatic transmissions. Works well with stock type exhaust manifolds and dual plane intake with mild 4 bbl carb. This is an Awesome 4X4 and performance marine cam.; Advertised Duration (Int/Exh): 262/268; Duration @ .050 (Int/Exh): 219/227; Gross Valve Lift (Int/Exh): .468/.489; LSA/ICL: 112/108; Valve Lash (Int/Exh): Hyd/Hyd; RPM Range: 1400-5800; Includes: Cam & Lifters (#71817PR-16)

 

And the xr270 hr is also small
at 224/218@50
GM 8100/8.1L 8-Cyl. 2001-Present

• Produces Better Throttle Response
• Produces Top Engine Horsepower
• Delivers Increased Engine Vacuum
• 1 Year Limited Warranty
  Best in performance applications, aftermarket intake and exhaust recommended.

Specifications:

Engine Make/Size
Chevy 496
RPM Range
1200-5200
Lifter Type
Hydraulic Roller
Int. Duration Advertised (Deg)
270
Exh. Duration @ .050 in. (Deg)
224
Exh. Duration Advertised (Deg)
276
Int. Duration @ .050 in. (Deg)
218
Usage
Street/Performance
Quantity
Sold individually
Lobe Separation (Deg)
114
Exhaust Valve Lift with Factory Rocker Arm Ratio (
0.51
Intake Valve Lift with Factory Rocker Arm Ratio (i
0.51
Valve Lift with Factory Rocker Arm Ratio
0.510 int./0.510 exh.
Advertised Duration
270 int./276 exh.
Computer-Controlled Compatible
No
Valve Springs Required
Yes
Cam Style
Hydraulic roller tappet
Exhaust Duration at 050 inch Lift
224
Intake Duration at 050 inch Lift
218
Duration at 050 inch Lift
218 int./224 exh.
Advertised Intake Duration
270
Advertised Exhaust Duration
276
Basic Operating RPM Range
1,200-5,200
Grind Number
CB8 XR270 HR14
Exhaust Valve Lift
0.51 in (12.954 mm)
Intake Valve Lift
0.51 in (12.954 mm)
Manufacturer's Part Number:
46-422-9
Shipping Weight:
11.1
Package Height:
2.8
Package Depth:
24.5
Package Width:
3.2

 

You can go a bigger cam…imho

 

JMO
OE L82 cam has a bit too much intake duration (~ 222* @ 0.050") for such a low compression ( ~ 9:1) Street Traffic motor; low rpm torque suffers as a result and especially so when it's in front of an auto trans.

following HFT cam is USA, affordable, available and has a bit less intake duration (214*). When compared to OE L82, throttle response in traffic will improve.
https://www.summitracing.com/parts/s...make/chevrolet
about $75 ...USA cam kit with lifters of unknown origin (likely Mexico) is about $155.

 

you should look at your bearings. all that shaved metal may not be stopped by the filter, If they are good check the lobes of the old cam. If it was run before the old lifters have to go on the same lobe they came off of. If its new you need to use a good high ZDDP oil when you are done breaking it in. I like mobil 1 15W50

 

That cam is way way way too much cam for a stock L-82. In fact the factory cam is too much cam for a stock L-82. If you're not doing anything else to the motor, I would put in something smaller than the factory cam. IIRC the stock L-82 cam is about 222/222 @ .050". You should probably be looking for something in the 215-220 range. Find a good dynamic compression ratio calculator and shoot for a cam that will give you about 8:1 DCR. 8.5 if you have aluminum heads.

 

I'd pitch all of the old factory parts including the block.

Perfect time to upgrade the whole engine. Roller cam, roller rockers upgrade, aluminum heads, 10.8 to 1 compression etc.

Worst case, keep factory block and upgrade everything else to roller spec.

One of the best choices, I made for my car was a similar upgrade.

 

I went with an Isky 264 Mega cam, 214-214 .450 lift 108 LSA on my stock 76 L82 T400 and 3.36 rear. Much stronger low and mid range even with factory cat and restrictive exhaust. Comp 268HE will give similar results.

 

w/wilcar, read my mind. Before you buy more parts pull the old cam out and see what your cam bearings look like.
Dont coat the sides of the lifters with lube, just a little oil so they spiin easier on startup

 

Stock L82 cam form 1979

​​​​​​Hydraulic flat tappet
.450 / .460 lift
222/222 duration
114 Lobe Separation Angle

above is STOCK^^^^^^^


so.... really..... do you want to put in a smaller cam then a stock 1979 smog 225hp

 

The OP joins the forum and asks one question then never comes back ....and we are still posting on this?