Ok, with your guys help from my previous posts, I've got my new cam choice down to two I believe. For those that don't know what I'm looking for: I'm trying to get more use out of the OD on my TKO-600 and hopefully gain a little MPG, but not lose a lot of power. So here's the cam I want to replace:

Crane H-272-2
Lift - .454"/.480"
272/284
@ .050 - 216/228

And here's the two I'm thinking of replacing it with:
1.)
Lift - .443"/.443"
288/288
@ .050 - 214/214
Lobe C/L 112.
This one is close to the ISKY 264 MEGA, but cost $100 less. And just like the Edelbrock 2103 but $50 less.

2.)
Lift - .420"/.443"
278/288
@ .050 - 204/214
Lobe C/L 112.

I'm not really sure how having different intake and exhaust durations would effect things. What's your guys opinions?

Here are the car specs too:
SBC 350
-1.94/1.50 open chamber iron heads 462624
-9.6 compression
TKO-600
3.42 rear posi
~3600lbs

Thanks

what cams are these? Summit? Some generic no-name? The thing to notice is the extremely low profile intensity for both. On your Crane notice the advertised duration is 272° and the duration at .050 is 216°, a difference of 56° On the first alternative the advertised is 288°, the duration at .050 is 214°, a difference of 74°. The second one is 278° - 204°, difference of 74°. These cams are apparently old and obsolete designs that produce little power for the duration claimed.

I think you'd be a lot better off with the real real Isky 264 or something similar. You might want to check that the Isky is ground on 112° LSA. You car will be happier in OD if you stay with a wider LSA like 112 or 114. I have a Crane 262 in my 327 57Chev PU, it's great. Also, if you stay with a quality vendor like Crane or Isky you'll get a cam ground on a P-55 or similar core, much less chance of losing a lobe. Those generics you're looking are unlikely to be ground on a quality core since their main selling point is low price. Flat lobes are no fun at all.

I would stick with what you have in there. If isn't not broke don't fix it.

Dave

I agree with Dave. Neither of those cams will be an improvement over your current cam.
Save your time and money until you can afford a nice hydraulic roller.

Completly agree with the above
Those are generic lobes everyone has that have been around since the Flintstones :D
That 204/214 deal is what has been called everything from an "RV" cam to a "stage one" upgrade to "Torque Specials" to God know's what
It can be bought from every mail order house & warehouse in a generic "white box" for about $50, probably less

And none are anything like the Isky 264 ;)

They are WBR and Clevite and Elgin type cams.

The 204/214 is E-brock's Performer for a lot less money, (check Northern Auto Parts here), and the other is the single pattern, one step up from the Performer.

The dual pattern one step up is the 214/224 cam.

pdq67

They are WBR and Clevite and Elgin type cams.

The 204/214 is E-brock's Performer for a lot less money, (check Northern Auto Parts here), and the other is the single pattern, one step up from the Performer.

The dual pattern one step up is the 214/224 cam.

pdq67

=
And they are still both junk compared to what he has ;)
And they are still not anywhere near what the 264 Isky is,,
Regardless of price :p

Alright, then I'll stick with the cam I have now and work with that.

Thanks for the insight

Here is some good info. on camshafts that may interest you.

http://www.minimania.com/ArticleV.cfm?DisplayID=1773

Isky 264 Mega is 264/214, 108/108, .450" lift.

And right Mike, he's got a good cam in there already!

Isky's 270 Mega at 270/221, 108/108, .465" lift is next up the ladder, but I don't know how bad it will hurt his gas mileage?

pdq67

PS., and fwiw, Isky's Mega Cam line were the XE cams back when they came out!! Suckers are still good cams to this day, imho.

I think he needs something like an Isky 264 ground on 112° LSA. that will really help with the low RPM cruising on OD. Basically, there's got to be smooth power available under 2000 RPM for OD. Just not gonna get that with 108LSA in a 350.

So many guys are into OD stuff and trying to keep the wallet fry factor down at the gas station, it's starting to create a sub-niche market for cams that work under 2000RPM. I see a market angle developing.

what cams are these? Summit? Some generic no-name? The thing to notice is the extremely low profile intensity for both. On your Crane notice the advertised duration is 272° and the duration at .050 is 216°, a difference of 56° On the first alternative the advertised is 288°, the duration at .050 is 214°, a difference of 74°. The second one is 278° - 204°, difference of 74°. These cams are apparently old and obsolete designs that produce little power for the duration claimed.


Tom, this is the first time I've seen someone mention this.
can you (or anyone) explain this 'profile intensity' for me?
my Lunati 60203 268/227I 276/233E = 41/43 what does this tell me?:confused:


sorry not intending on hijacking the thread but maybe it will help the original poster also.

some cams open the valve faster than others, newer designs are often better at this. think of it as how steep the ramps are. a more aggressive design opens the valve further faster, creating more actual valve open time without increasing the duration. there's limits to this, valvetrain noise and and wear increase with steeper ramps. The cam lobes mentioned in the first post are very old and don't push the limits at all.

Sorry about this??

pdq67

BUT Tom, that said, they STILL run fine, imho, even if they are old-school!

Certainly not as powerful as the newer "XE" type short hydraulic intensity cams, but they still run fine by me...........

Take my old 295hp/350s original L-48 engine w/ the old GM -929 cam, it ran darn good, but it ran one heck of a lot better after i installed the old -151 cam in her!

For less than $20 back then, the old -151 cam was a bargain to me!!

pdq67