I'm looking for a STOCK head GM847 or cc306 dyno graph to look at. I plan on doing a cam swap and eventually do heads. But I don't want to rev extremely high and want to see what I am losing out of by shifting early.

Please don't tell me what NOT to do, I just want to see.

 

Here ya go Scotto-

CC306, 1.6 rockers, Comp 986 springs
stock rebuild with 11.2:1 compression

Heads are unported, factory castings with SLIGHTLY larger LT4 valves installed in them. Trust me, the compression bump and valves are giving me very little HP if anything with unported heads.

This will be fun...

 

Thanks robert! I was wondering if you'd see this.

 

Here's mine. Hooker LTs with 3in duals, CAI, GM847, comp pro mag 1.6s. Everything else is stock, heads never off.

 

Hey brain, is that through a 6 speed I assume?

 

Yeah he has a 6 speed car.

Also brain, I forgot to ask you before, what RPM do you shift at? Looks like maybe 63, 6400 tops?

 

Fireman, do you know what is was in SAE? 365-370?

That's awesome!

 

371rwhp/358rwtq SAE

 

im not telling you what NOT to do... but before you jump too quickly on the 847/306 bandwagon, i highly suggest you head over to AIs site and check out their grinds. They have some more middle-of-the-road (and by this i DONT mean small) durations that make good power on stock heads. After considering the 847 I decided on going with their 230/238

 

Will it make the power the one in Fireman's graph did?

 

here's the data on two of their cams:

http://www.advancedinduction.com/AiProductsCK.html

 

I'm definitely not dissing on AI's products, but I'm curious as to why you believe the negative talkings about the 847. It's a proven cam and makes excellent power, and there are more than a few nearly identical other setups that have been duplicated time and again here. You can see that my dyno peaks well below 6300. AI even say that their cam is excellent for rebuilds with 11:1 compression. Why would you want peak power of 365 RWHP at 6300, when you could have 360 RWHP at 5800 rpms? Show me a cam only LT1 that makes 380 rwhp at 5500, and then I'll show you a cam that everyone should run. I've done NUMEROUS comparisons of cams, and in EVERY case, the 847 has made MORE power from 3000 rpms and up. It even made the SAME power as a custom cam from BRE. I can't even find a cam only dyno sheet from AI's 230/238.

When numbers are better than what the majority are used to, they are discounted. If the myth that the cam is too big is prepetuated long enough, then people tend to believe it. Hmm...maybe its a conspiracy so people undercam their cars and keep them slow.

 

Im not trying to flame you brain, I understand where your coming from. The only thing I can say is everyone should pick a cam based on what they want not what everyone else says. I've heard countless times that the 847/306 are too big for stock heads and people should be hesitant to use them. Sometimes dyno sheets mean jack **** if you cant put the power to the ground. I believe FrankZ's car went low 11's cam-only with the baby crane 227 and til now I havent seen anyone run with him as far as shelf-cams go(I might be wrong, so correct me). What I do love about the 847/306 is that when it comes time to get some ported heads, they will shine and you wont have to swap cams again.

The reason why you cant find any AI dyno #'s is because everyone is still hung up on running cc306, GM847, Hotcam, XE224/230 etc.. becuase they are proven performers like you said. That doesn't mean that they dont work, they are still reletively new grinds and over time they'll start showing up on more cam-only setups.

 

When did i ever say anything negative about the 847?

I personally think the duration is a little too extreme for what is optimal on an LT1. Sure it might make more power... but i think it demands too much RPM for a lasting combo. If you dont mind revving to the moon, then the 847 is the way to go im not even going to argue that.

 

I need to get a set of good heads on my 847 car, lol.


My 847 car only made 340rwhp @ ~6400 and 322rwtq @ ~ 4750. But I have a nitrous/FI converter so that could account for some power loss, dunno... But it's been to the track once since the converter/tranny and it went 12.4 @ 110, I'm gonna try to go to the track tonight and see if I can get a 12.2 or 12.1 out of it, that would make me happy.


Hopefully I will get around to finishing putting my nitrous kit back on the car soon and see what it does on a small kit.