Anyone running this ?

Bottom of page
Part # 24502586

http://www.gmpartsdirect.com/results.cfm?perfPackages=1&curpage=3&startrow=11&pkgid=42

DESCRIPTION: LT4 HOT CAMSHAFTThis hydraulic roller cam is for service only for all V8 engines with roller camshafts. The duration at lash point in degrees (intake/exhaust) is 279/287; duration at .050" tappet lift (intake/exhaust) is 218/228; and maximum lift with 1.6 rocker ratio (intake/exhaust) is 525/525. Valve lash is zero/zero and lobe centerline is 112 degrees. Technical Notes: The LT4 camshaft P/N 24502586 was designed to be used in a number of different engines. Therefore, the following change may need to be made to allow for correct assembly of the engine: For LT1 and L98 engines 1995 and before, the dowel pin in the end of the camshaft must be pushed in so extension from end of cam is .30+/-.01", the same as the production part. For 1996 LT1 and LT4 engines, the dowel pin is in the correct position, extending .620" from the end of the camshaft. This camshaft has a fuel pump lobe.

It's a good cam originally designed for the LT4 Corvette in 96, but it wasn't going to meet emission standards so it was sold as an off-road cam.

Just keep in mind, it was designed for use in a 350 with exhaust manifolds, so of you're runnng headers and free-flowing exhaust, you don't need a dual pattern cam. More here:

http://www.camaros.net/forums/showthread.php?t=18391&highlight=cabbage+dual+pattern

it works. get it. just make sure you have around 10:1 compression and good heads- that cam and a set of vortecs is probably the best old school small block combo you can get at any GM dealer.
silky smooth 800rpm idle with 17" of vacuum and the ability to rev up to and beyond 7000 rpm whenever the urge arises. and it runs on 89 octane, to boot.
and i'm not just talking out of my buttocks here- i had that combo in my 71 Nova for 4 years. i drove that thing anywhere and in every form of weather, and always averaged 15-17mpg with 3.70 gears and a 4 speed.
when the time comes to put that 94 Caprice LT1 out in the barn to use, it's getting the HOT cam kit.

I've got one in my ZZ4. Etec 200 heads and rpm air gap manifold, 1.6 rockers and 1 3/4" headers. Very strong. Super dependable. Happy little mildly bumpy idle, gets your rhythm pumping. Mine differs from Derricks in that mine is done pulling at about 6100. Will go through 6500 with a good carb, but no point in it for mine.

Ran 11.70's with 29" slicks, 5k converter, 4.56 gears at 3320#.

Still have the engine, still a favorite toy I just don't play with it much anymore. Want to pick up a rat rod for it. I stuck it in my 66 p/u back in May, did a huge burnout and then parked it again.

This is a little off the topic of the LT4 cam (sorry) but I have a question that relates to the link you show.

I'm about to build a 355 ci , 9 to 1, SBC with Edelbrock aluminum Performer RPM heads (170cc intake) and Edelbrock Performer intake. I need to choose a cam which gives good low and mid-range torque in a mild daily driver style engine for my 72 El Camino.

The hitch is that I will be using stock "ram horn" exhaust manifolds and mufflers.

Should I be going with a single pattern cam such as 218/218 @ .050" and .454/.454 lift or a dual pattern cam like the CompCams XE256 (212/218 @ .050", 447/454 lift)?? - Or some other cam??

I want at least 300 HP at relatively low RPM (3500-4000) and as much torque as I can get at 3000-4000.

As a side note, I used to own a 96 Corvette LT4 and loved the engine / cam combo - idles like a grocery getter but very responsive.

Thanks for any help on my cam choice.

67funcar

restrictive exhaust? well if you want topend HP get the split pattern. if you want torq, get the single pattern, the restrictive exhaust would help back pressure. however, those ram horns flow pretty dang good. I think you would like the 256.
just my .02. and it aint worth much.

I knew a guy that had one in a LT1 4th gen camaro with ported heads and a LT4 intake and headers. It ran really well and had a nice chop to it. Good torque down low and the mid range, but it gave up past 5800. If you want a good daily driver cam, this is it.

The old Ram Horn manifolds are decent. Next best thing to headers. If you had Chevy heads, I'd say definitely get the split pattern cam. With Edelbrock heads, you could go either way. I would probably still lean towards split though unless you decided on headers.

Hot cam. Had it in a 350 and a 383. Loved it.

:beers:This is a little off the topic of the LT4 cam (sorry) but I have a question that relates to the link you show.

I'm about to build a 355 ci , 9 to 1, SBC with Edelbrock aluminum Performer RPM heads (170cc intake) and Edelbrock Performer intake. I need to choose a cam which gives good low and mid-range torque in a mild daily driver style engine for my 72 El Camino.

The hitch is that I will be using stock "ram horn" exhaust manifolds and mufflers.

Should I be going with a single pattern cam such as 218/218 @ .050" and .454/.454 lift or a dual pattern cam like the CompCams XE256 (212/218 @ .050", 447/454 lift)?? - Or some other cam??

I want at least 300 HP at relatively low RPM (3500-4000) and as much torque as I can get at 3000-4000.

As a side note, I used to own a 96 Corvette LT4 and loved the engine / cam combo - idles like a grocery getter but very responsive.

Thanks for any help on my cam choice.

67funcar

I have a Comp Cam XE262H currently and it makes alot of torque........checkout "The Best Build" in here ,basically my motor, just always looking for more on a budget .....:D 404 Ft. Lbs beginning at 3000 RPM. Peaks at 4600 at 439 Ft. Lbs,not bad Hp either 416 at 5600 RPM
http://www.superchevy.com/tech/0312sc_355_cid_short_block/index.html

alan, it says Danger Mouse was 4.030 bore x 3.76 stroke. Am I missing something? thats not a 355 according to my math. Altho...I didnt stay at a holiday inn last night. :confused:

alan, it says Danger Mouse was 4.030 bore x 3.76 stroke. Am I missing something? thats not a 355 according to my math. Altho...I didnt stay at a holiday inn last night. :confused:
I hear you, it should be 4.030 B X 3.48 S correct ??
Here's another link........
http://www.popularhotrodding.com/enginemasters/articles/chevrolet/smallblock/0412em_small_block_chevy_engine/index.html

I think the link has this reversed:
"found that 1.6:1 ratio intake and 1.5:1 ratio exhaust were the best combination."

I've read Harold and Chris and another cam guru recommend doing rocker ratios this way, usually based on heads with good i/e ratios.

I thought for the most part everyone runs the higher ratio rocker on the exhaust side..

I have 1.6 on both, on 2 engines. And I almost used a cam where it was recommended to go 1.6/1.5. It's just a tool, John. Something you use to suit a purpose. 1.5/1.6 is used as well, and sometimes nothing is needed and 1.5/1.5 is cool beans.

My hot cam has 1.6ers, but I bet it would be pretty near the same with 1.5's, lift would be about 492 vs 525. Damthing isn't open that long to get too too much advantage from that. It's like my 421 engine, can't get enough air in it, and limited to .700 lift unless I want to blow another bigger fortune on heads so I maxxed out the lift at .712, and use stupid amounts of duration to try to compensate and get some air in the damthing.