7.4L Cam shaft options

[malibu795]

so first post.... some info I have found...cant find a bunch of stuff I found earlier... 12552296 camshaft is in my truck...
GM#12552296
.004” 280,299
.006” 266*/284*
.050” 204*/209*
.200” 113*/114*
Lift .480”/. 483”
ICL 115.5*
ECL 120.5
LSA 118*

GM#12551622
.004 300*/ 300*
.006 288*/288*
.050” 225*/225*
.200” 125*/125*
Lift .483”/. 483”
ICL 109*
ECL 122*
LSA 115.5*

24502611 is the camshaft that is in the 454HO and 502HO crate engines
.050" 211*/230*
lift .510"/.540"
LSA 112*

HT502 crate engine has the above mentioned 12552296

most truck engines have a 2.065/1.725 valve 100CC combustions for heads..
I did a 468 gen 4 BBC build while back did ~380/540 at the crank, at rough rpm 5000/2500,with over 500tq from 2000-3800rpm
ran 049 heads 2.065/1.88 valve, edelbrock performer intake, 600cfm edelbrock carb, headers MSD ignition, dual 3" exhaust
cam was
https://www.summitracing.com/oh/parts/sum-1300
.050" 208*/218*
LSA 112
.475/.500

 

[Fez_Jet_Az]

http://www.compcams.com/Company/CC/cam-specs/Details.aspx?csid=589&sb=0

I just fired my engine last week with the above cam and its great. It is mannered much like stock with idle quality and vacuum. Passed AZ roller emissions with the factory exhaust as clean as a whistle.

In all fairness i have not loaded up and towed on the interstate with it yet, but it does pull at idle my camper at 10k lbs. I also put the pedal to the ground with the camper hooked up and there is plenty more get up than there was factory in first gear, now this was just taking it in and out of storage at the lake so I couldn't get too crazy.

Putting the pedal to the truck through the gears on the street has really impressed me, your at 100mph in a blink and it pulls steady building power through 5k rpm shift points, there is ample power on tap all over the rpm band.

I went with the Comp kit for this cam install on a fresh engine build. If you go that do note that the timing set that comes in the kit will not work with the reluctor wheel that the crank position sensor reads, Jegs was generous enough to refund me the cost of the timing set. Also you will need valve spring rotator eliminators which are not included in the kit. Another surprise per say was larger 3/8 pushrods which require additional purchase of GM performance #12562369 guide plates, my factory L29 is 5/16. Rockers were not included in kit but I went with Comp Magnum roller tip as they do not deflect like the factory units do.

I will say that aggressive lobes on the comp cam combined with the roller tip rockers generates a fair amount of valve train noise that depending on the individual might be considered as annoying at idle. That combined with the fairly obnoxious noise that the injectors I used make has led me to open my valve covers a couple times just to do a wellness check on the valve-train. But at this point I am over it and its confirmed all is good, just be aware. I have delayed my header install as to not introduce additional noise under the hood, but next week the cam gets to breath through headers and full exhaust, and that should be real exciting.....

In hind sight if I had it to do over again I would have gone with cam in the link below, its the same lobes but ground on a 110lsa and 4 degrees advance VS the cam in my engine that is ground on a 113lsa with 2 degrees advance.

I assume that the characteristics on a 110lsa would be tame enough for what I do with my truck and still pass emissions, but that is an assumption based on how docile the manners of the cam are now in the motor on the 113lsa.

Black Bear Performance delivered me a mail order tune for my ancient 97 black box computer.

http://www.compcams.com/Company/CC/cam-specs/Details.aspx?csid=579&sb=0

Hello all, I have been kicking around the possibility of doing a cam swap in m 97 7.4L. I was looking at the Gen 6 454 XR258HR from comp. I was wondering if anyone had some advice for me on this. Also, has anyone used the EFI connection COP conversion on a gen 6 BBC and left the factory FI system in place?

Hello all, I have been kicking around the possibility of doing a cam swap in m 97 7.4L. I was looking at the Gen 6 454 XR258HR from comp. I was wondering if anyone had some advice for me on this. Also, has anyone used the EFI connection COP conversion on a gen 6 BBC and left the factory FI system in place?

 

[Franksmith]

Any updates? How did the exhaust turn out?

Did you have to upgrade the injectors?

 

[Robert Herston]

That looks like a small block cam that wouldn't fit in a 7.4l.
I have this one, an RV cam made for towing:
https://www.summitracing.com/parts/cca-01-412-8

You'd need upgraded springs and a tune to take advantage of any more power from the cam.

what valve springs did you go with?

 

[TW97]

Just did a cam swap in my '97. The cam you posted is close on duration. It's a little lower on lift and the lobe separation needs to be lower if you actually want it for towing. 108 is as low as comp can go with their cores.
Finding info on these trucks is deff harder than the newer LS stuff I play with daily.

Hi i have a 97 7.4 vortec. I'm wondering if anyone can help me out with a camshaft pick. Stock pcm in it. Stock camshaft. Like a camshaft that i don't have to change out the pcm.

 

[BeXtreme]

Hi i have a 97 7.4 vortec. I'm wondering if anyone can help me out with a camshaft pick. Stock pcm in it. Stock camshaft. Like a camshaft that i don't have to change out the pcm.

I sent my stock cam to Delta camshaft and had it reground. You can call them up and tell them what you want it reground to. It was about a 2 week turnaround and ~$140

You aren't going to get the full potential out of any change without adjusting the tune. The best bet is an 0411 swap and your own tuning, because I don't think anyone can even tune the 97 black box pcm for you.

 

[L31MaxExpress]

I sent my stock cam to Delta camshaft and had it reground. You can call them up and tell them what you want it reground to. It was about a 2 week turnaround and ~$140

You aren't going to get the full potential out of any change without adjusting the tune. The best bet is an 0411 swap and your own tuning, because I don't think anyone can even tune the 97 black box pcm for you.

97 Black Box can be tuned. Mine was tuned with TunerCats OBD2 which later became Jet DST.

 

[Supercharged111]

97 Black Box can be tuned. Mine was tuned with TunerCats OBD2 which later became Jet DST.

Yeah, but the blackbox can't keep the TCC locked on a throttle lift so 411 it is. I personally am not interested in running a 4L80 off of a 4L60 segment with relays added.

 

[618 Syndicate]

I sent my stock cam to Delta camshaft and had it reground. You can call them up and tell them what you want it reground to. It was about a 2 week turnaround and ~$140

You aren't going to get the full potential out of any change without adjusting the tune. The best bet is an 0411 swap and your own tuning, because I don't think anyone can even tune the 97 black box pcm for you.

@Dropped88

 

[L31MaxExpress]

Yeah, but the blackbox can't keep the TCC locked on a throttle lift so 411 it is. I personally am not interested in running a 4L80 off of a 4L60 segment with relays added.

I would have to look, but I am fairly certain Tunercats has those parameters. Then again my 4L60E unlocked and relocked when you let off at highway speeds and it never bothered me. The only time my 85E stays locked is over 60 mph. Below that it shudders. I have added a bit of fuel there and it is still lean. I think my setup has very large amounts of internal EGR on closed throttle Decel. EGR causes misfire hence the "lean" reporting of the 02 sensors.