I'm looking into upgrading my cam with a better, still streetable cam. But first, I need to find out if I have the same cam as the LG4.

Can anyone give me the cam specs for the LU5 Crossfire motor? I have an 83 z28 with the LU5, minus the CFI set up now. I've found specs for the LG4's tiny cam. I know that the LU5 made about 25 more horses than the LG4 in 83, but I'm not sure if it's the same cam or not.

 

I don't have the specs at my fingertips, but they are NOT the same as LG4 cam specs. I believe they are the same as the Corvette's 350 cubic inch L-83.

 

Thanks for the fast response, Chazman. According to that info, our LU5 cam specs are: 403i/415e @ 50. 202/206 duration. I'm narrowed down to two cam choices for my LU5, I am keeping the stock converter. What's your two cents on these choices?

Either a Hyd flat tappet with a duration of .204 int/.214 exh @.50 inch lift and with a lift of .420 int/.442 exh. OR

a duration of .214int/.224exh @.50 inch lift and with a lift of .442 int/ .465 exh.

 

Those are both just generic cams from the same series, adjacent steps; in fact the exh lobe of the one is the int lobe of the other. The 1st is commonly referred to as "the RV cam"; the second as "the mild cam". Very common and unremarkable in any way.

If you're going to keep the 305, the first one is the wiser choice. Even though the #s don't look all that much different, the parts themselves are; the stock lobes are even less aggressive than the old generic cam, and the LSA is different.

 

Yeah they're just the generic 'budget' Summit brand cams. All else remaining the same for now, (heads, gears, and stall), the first is my best bet to compliment my power band?

Now, how much more would something like a Comp Cams Extreme Energy XE256 complement my power band opposed to the generic, outdated Summit cam? This is the cam that a lot of thirdgen members told me to use. Sofakingdom, you might have been included on that list, I can't remember. Comparing the generic Summit with this XE cam, is the extra money worth it?

 

What cam have you chosen ? i have a 1983 cfi as well

 

As little as the $$ difference is, it makes little to no sense NOT to step up.

Why spend however much you're going to, on cam, lifters, valve springs and all theur hardware, tools you discover you need but don't have, gaskets, fluids, timing set, "might as well"s like a water pump and hoses and belts, "oh s*** look what I just found"s, however many days of labor, and then .... FAIL to get ALL YOU CAN out of the project?

Yes the XE256 is a well-known excellent match for the 305 with less-than-ideal gearing. That would indeed be a better choice.

 

I have run the XE262 back to back with the 214/224 generic "the mild cam" sofakingdom mentioned above in my 70's smogger 350 with 2.77's, no other changes. The XE was very noticeably torquier across the whole rpm range, much crisper throttle response, idled better and used no more fuel.

I imagine the "the rv cam" vs the XE256 in a 305 would be a similar deal. Or there's the Voodoo series to look at, similar situation from memory.

 

I'll be going with the XE256. Are you running our stock cam or have you upgraded yours in your LU5?

 

i have the factory cam in mine

 

Nice third gen, I'm surprised that I haven't seen you around. I'm 15 minutes north of Boston. I'll let you know how this 'step up' cam compares to factory once all is said and done in the spring.

 

To bring this thread back to life -- is the Comp Cam model the XE256H? I'm looking for a new, streetable cam for my 82 CFI. From reading the previous posts, it sounds like this cam what I want -- slightly better than stock, good for cars with low gears (which mine has) and stock components. Has anyone who has used this had to pass any kind of emissions?

 

do you have a link? i am interested in a performance cam for my 1983 LU5.

 

I'm just going by what was said in this thread. The Comp Cams site lists the XE256H for hydraulic, flat tappets small blocks.

http://www.compperformancegroupstore...ory_Code=HFTXE

 

From what I remember based on this thread, this is an ideal cam for our LU5's with a pretty much stock motor, stall speed, and gears. I think they sell it in a complete kit as well through summit and maybe through jegs. It comes with everything that you will need and it was under $400 if I remember correctly. I would have this cam in my car already if this year hadn't left a burning hole in my pocket..always next year I guess.

 

Classic Industries has a Crossfire cam kit from Comp Cams similar to what you describe. I have to wonder if it's the XE256...

 

That's the one.

 

wow 2 cams plus a cam set for crossfire cars
http://www.classicindustries.com/fir...s/222008a.html

http://www.classicindustries.com/imp.../*222008b.html

http://www.classicindustries.com/imp.../*222008d.html

 

All 3 of those are the same cam... this one here... it's not the XE256

http://www.summitracing.com/parts/CCA-12-388-4/

If you want that particular one, get it from whoever charges the least for it.

 

http://www.crossfireinjection.net/catalog.htm

 

Any updates?

 

Which cam is good for a 350?

 

i installed a compucam 2030 in my CFI 350 when i had engine apart for repair in 2013; 2030 pretty mild and no difference in running or performance VS original L83 cam was noticed at low or mid RPM,but i took my modified/ported intake off for further modification/replaced with lightly ported stocker,so don't know about higher RPM difference.

 

The biggest things about the xe compared to a classic cam like a 204/214 is that they have a narrower lsa (super important) and a faster ramp rate (how fast the valves open.

You will build more cylinder pressure on the xe due to the narrower lsa and in general you want the valve to open quickly as possible with the caveat of valvetrain durability. For engines with low compression and restrictive air flow the comp is a way better choice for power. Where the old grinds shine is they are easier on valvetrain parts like lifters.

 

How was the renegade intake any improvements?

 

not a renegade-i took off my modified manifold in order to further improve the modifications i had done back in 1995:further porting and port reshaping before it is reinstalled.meanwhile my engine is saddled with a slightly ported stock manifold...The modifications i had originally done to my stock manifold made a huge difference for the better,so i am sure a renegade would be even better yet

 

What camshaft and ratio rocker arms are you using?

 

the 2030 cam and stock 1.5 stamped rockers-years ago,i had bought some roller tip needle bearing 1.52 rockers(i think they are crane) but have not installed them yet-decided it would be better to wait until i had modified the heads with screw-in studs and guide plates before using the rollers.Also the roller rockers are somewhat heavier than the stamped and i might need stiffer valvesprings to compensate for the heavier tip weight of the roller rockers.Besides reduction of friction and less deflection with the roller rockers
VS the stamped rockers,it's possible oil temps might be reduced slightly(though i have an oil cooler installed)