JPMuscle

Well, budget constraints are making me cut back on my motor build for this summer which is fine. So were jus gonna throw this thing together and make a fun street motor out of it and the big build up will come next Winter.

Since now Im going to be using the stock Iron heads with a good valve job and mild porting if I feel ambitious enough I need some info about a few cams. Im looking at either the Comp 292 magnum or the CC305 magnum, both are Hydraulic Flat Tappets. I can get a really good price on the complete valvtrain kits with either cams so... Does anybody have any experience with either of these to cams on a relatively mild 468. I figure both would be good for 550+ hp on motor with the 292 coming into power a little sooner.

Any info is appreciated,
Thanks,
-john

8a8mfh

iTrader: (3)

Where did you get those cam numbers? I'm pretty sure those are small block cams. I have experience with the 292 magnum and it was in a small block.
I'd look into the Lunati bracket master cams, or the newer Lunati VooDoo cams. Their quality seems much better than Comp.
As far as recommendation, I can't say much without knowing compression ratio, desired rpm range, etc.

JPMuscle

I ran through Comps cam charts real quick on their site, I assumed the Grinds were the same in relation from sbc to bbc but i could be wrong. As for the motor were looking for around 11:1 compression and keeping the power between 3000 and 6500. Dart single plane on top, and a 850 Holley DP. Im jus looking to throw this motor together for this summer for ***** and gioggles until the main buildup next winter.


Heres the Link for the Cam Kit I was looking at. its half way down the page or so

http://www.jegs.com/webapp/wcs/store...0707&langId=-1

Heres the part number on summits site.

249-K11-213-3

LFTNWHLS

What ever you do don't run a solid roller on the street with a windage tray. Solid Roller lifters are splash cooled As per comp cams warrantee department.

I now have a hydualic roller no problem yet

8a8mfh

iTrader: (3)

Thats interesting, the cam gets oil splashed from the rods and the last time I checked there is no windage tray between the cam and rods. This is why I won't buy comp, they suck and their tech people bullshit you because they know **** about their own products or general theory of operation.

LFTNWHLS

The said splash from the crankshaft.

8a8mfh

iTrader: (3)

Yes that splash is what comes out from between the connecting rods, thats why it's important they are not too tight during a build up.

Anyway to answer the original question you need to download a dynamic compression ratio calculator and choose a cam that will give it a DCR thats going to work with the type of fuel you plan to use. Static compression of 11:1 doesn't mean much, you need a dynamic in the 7's to run on low octane, maybe mid 8's if you keep it cool and run 93 but thats pushing it.

JPMuscle

Anychance you got a link to one, I have the Dyno Sim 2000 program I havnt looked for one in there yet but im prolly sure there is.


-john

8a8mfh

iTrader: (3)

I use this one it's towards the bottom of the page Here.

blue1969

iTrader: (1)

Have to agree that the tech help has gone downhill in the past couple of years at least. Too many people running solid rollers on the street (myself included with one car having comp SR cam & lifters with no problems) to believe some bullshit about a windage tray not letting the lifters splash oil cool. Sounds like they formed the first complete sentence that came to mind and called it an excuse. Crower roller lifters though for me from here on out.

JPMuscle

Thanks Il post up the numbers after I crunch them.


-john

Firechikn

iTrader: (15)

I had a 292 magnam in a 454 with no problems. Medium lope and very streetable. The only problem is I don't think you'll get 6500 out of it unless you bump up some spring pressure. Mine flattened out around 5800-6000, which is about power range anyway I think. I too am a solid street car driver myself. No problems.... yet.

john59

iTrader: (2)

I've built many BBC motors which heads are you running are they 049's open chamber?

Take a look at the Xtreme energy cams Hydraulic newer design more agressive lobe, the Magnum is a good cam but my experience has been that these newer cams make more usable power for a street motor, I've run 049 open chamber heads lightly ported with bigger valves 2.19 intakes and 2465 TRW slugs, and made excellent Hp,enough for 11.3's in a full bodied 70 Nova motor only.
John