would the LT4 hot cam be a good combo for a stealth ram setup?
stock L98 Heads..full 3" exhaust..dual cats..1 3/4" Headers..CAI

http://www.summitracing.com/parts/NAL-24502586/

i know nothing about how cams work but yeah, ive been reading that its a good cam but i just wanna make sure it'll perform with the HSR..


Mikey

 

its a good everyday cam. dont have the lopey idle that alot of us gearheads like but performs well. i have the stealth ram now and it loves my trickflow cam at high end but thats any stealth ram. youll get good power put of it and not break the bank on gas. plus without a stall you dont want to go to big on the cam.

 

alright thanks..would you know what kinda power im lookin at with this combo?

 

here is sound chip with a 355ci hsr lt4 hot cam long tube headers. 113 vette heads.
http://s38.photobucket.com/albums/e1...t=IM000437.mp4

 

I'd venture a guess at high 200's whp? Bolt ons only can get you 260 on a good tune in good air. I would think that cam would be worth 30 more up top.

Its a good cam tho, works well on the LT1's it was designed for. Those heads arent too much different than 113 L98 heads and the Iron L98's are just alittle different than the 113 heads. They dont flow as well so it wont make as much power as the LT1's will, which routinely put down 330whp with that cam on stock heads.

Cant go wrong with that for a budget cam swap. You can find those cams used for 100-150 bucks all day

 

hmm...alright.. thanks orr

what about porting the stock heads?

 

watch the springs.. you'll prolly need to change them and possibly gets some work done to clear the .525 lift that is if you use 1.6 rockers

 

The only drawback with the LT4 hot cam is the valve springs it requires. I'm running factory 64cc truck heads (milled to 63cc's), and the factory springs are no where near spec for my LT4 hot cam. The GMPP springs spec'ed for it are $18.99 each from Summit, and unfortunately there are few alternatives that match the requirements;
1.320 outside diameter
332 lbs / in rate
1.220 in bind
1.780 installed height
101 lbs seat pressure
However, Trick Flow makes a set (TFS-31400413) that is close enough to work;
1.250 outside diameter
300 lbs / in rate
1.20 in bind
1.780 installed height
110 lbs seat pressure
You may need seat cups to install them, but the total cost of the springs and cups is under $100 from Summit.
I'm running the Hot Cam in a 331 TPI with a balanced bottom end, and a Megasquirt I ECM. It makes great power, is still streetable, and gives me decent mileage.

 

1.6 rockers could be good

 

Check out the specs of the LT4 Hot Cam vs a ZZ4 cam.
http://www.cis.udel.edu/~davis/z28/buildup/cam/
It's a fairly radical profile, especially for a "factory" cam. Just make sure your valvetrain is built to handle it or you're going to have your very own valve spring NASA space program.

 

So don't shop at Summit

http://sdparts.com/details/gm-perfor...parts/12495494

http://www.superchevyperformance.com...p/12495494.htm

 

LT4 springs are really not that good. There are MANY other choices for springs that will work well in stock heads. Alot of the 1.25-1.29" diameter double springs should drop right in.

Still need to watch max lift on the heads...valve guide to retainer clearance is an issue.

 

my 113 vette heads had manley 22410-16 springs and 23652-16+050'' retainers.with hot cam and 1.6 rockers. i all so had the guides cut. for 600 lift. when the heads were done over.

 

so should i port the stock heads with 1.6 rockers and those springs?

or should i just get a different cam that doesnt need all that?

 

Those are good springs. A machine shop shouldnt charge too much to have the guides cut down. You may beable to do that yourself. Its recommended for cams over .470" but you'd have to measure to see how much room you have. The .050" offset retainers or locks can be used with about .050" shims underneath to raise the assembly over the guides to get more lift but I think that only gets you around .510" comfortably.

 

Stealth Ram on a Firebird....maybe not, no hood clearance.

 

possible to do it but need to clearance some things
https://www.thirdgen.org/forums/alte...clearance.html

 

yeah ive looked into the whole hood clearance things..gonna cut the stock hood for now..2" cowl soon enough

is there a good cam i can use that wont need any springs or rocker mods?

 

They all will need atleast springs... you can get a custom grind or something with less than .460-.470" lift that wont need the guides cut down but still need springs swapped out.

To change a cam on these cars and to be worth it, i think you will have to atleast change springs. Now you can do the retainer/offset lock thing and shims underneath to get near .500" lift if you measure it all out. Can run a decent .480-ish lift cam then with some duration to it and get decent gains. Beehive kit is suppose to get more useable lift range due to smaller retainers or something like that but I dont have measurements to show it.

 

alright...ill look into it thanks orr!!

 

Thanks, I hadn't even thought to check Scoggins-Dickey

I cross-referenced the part numbers with Summit, and the only explanation I can come up with is they must be feeding a crack habit to have their prices so ridiculous on those springs. I'll be buying them from SD instead.

 

so lemme see...

i need:
the stealth ram manifold and plenum
the fuel rails
the various lines
bigger injectors?

if i get a bigger cam:
valve springs
1.6 rockers

thats it right?

 

and a custom tune.. or get the stuff and start doing it yourself

 

ahh see, i would have overlooked that! thanks!

 

Who has figured out a good tune for a speed density HSR with a lt4 hot cam, good heads (285 CFM) and exhaust (2210) in a 355 with 30lb injectors. That is the route I am going and I need my prom done.

 

i honestly dont know.. one of my buddy's got into burning his own chips so he hooked me up with a custom tune...

 

If you are buying a new cam ,I see no point in buying a smaller one and then putting 1.6 rockers on it to get the lift you want when you can buy a cam with the valve lift you want on the cam itself
Then you always have the option of changing to 1.6's down the track if you need more lift

 

buying a smaller one? wuh? lol

 

Are you set on the LT4 Hot Cam? While I was doing my research on here for my cam choice, many people recommended the Comp Cams 268 XFI. People said its similar to the Hot Cam but just a more modern version of it. But of course its more expensive than the LT4 hot cam.

And on a side note...your heads may choke out that cam. Just my

 

I was referencing the fact you only get the .525 lift on a Hot cam using 1.6 rockers.
You could buy a cam that has .525 lift with 1.5 rockers

Refer your comment above
"should i just get a different cam that doesn't need all that? "

 

The hot cam is a great cam however it does leave some power on the table.......
I prefer a little more for a performance based camshaft like the comp cams 503. You can also check out. www.elliotsportworks.com he can match a cam to your current combination to optimize your performance goals.......

 

ohh i got it now..thanks everyone