Just got heads and cam installed
12 Second Club
Joined: Feb 2003
Posts: 167
Likes: 0
From: Minneapolis, MN
Great Numbers! I am debating whether or not to get the heads ported first or get a 12 bolt with 4.10s....I am leaning towards the rear end though, cuz whats the point of running a lot of power if you can't hook it up?
Originally Posted by Camaro97USAF
Heres the head flow #'s The compression as it suts right now is around 10.3-10.4.
Int exh
.100 75.6 67.3
.200 155 118
.300 210 156
.400 255 182
.500 285 191
.550 293 196
.600 296 200
.650 296 204
.700 298 208
Wires came in today too, so I'm going to work on that this week sometime.
Int exh
.100 75.6 67.3
.200 155 118
.300 210 156
.400 255 182
.500 285 191
.550 293 196
.600 296 200
.650 296 204
.700 298 208
Wires came in today too, so I'm going to work on that this week sometime.
My peak flow on my ported stock LT1 castings was only 256, while my exhaust was 203 at .600 and intake ports were only 187 to give you a different view on head flow. My numbers were 402 rwhp and 390 rwtq, tq power starting about 2700 and peaking about 5500, hp peaking about 6200 rpms. I have only increased displacement by 5 cu in, so that's now where I made my HP or TQ.
I think I'm trying to say is, you need to do some more homework on what should go with what, and take a look at your cyl head volume numbers.
Just my $.02
Good point Rob, except the injectors, they won't hurt him any. Also is your website up to date, because on it it says peak flow on your heads were 275 CFM. 
I noticed your running a pretty big cam so your rwhp is about normal for decent flowing heads.
Obviously something isn't right with his setup though, if setup correctly their is no reason it shouldn't make 430rwhp.
I noticed your running a pretty big cam so your rwhp is about normal for decent flowing heads.Obviously something isn't right with his setup though, if setup correctly their is no reason it shouldn't make 430rwhp.
No, sorry, my website is terribly out of date.. I need to fix it when I get a chance. On the injectors, I agree to a point. If the computer isn't tuned for 42's it will most definitely hurt performance. If it's pig rich, that will definitely hurt performance. The ONLY real problem I can see occurring is the low CR he has, with that big of a cam, his dynamic compression ratio has fallen down quite a bit. Mine figures out to be about 9.3:1 DCR, his can't be any higher than 8:0 DCR with 10.3:1 static compression, that coupled with overly large intake and combustion chamber volumes will rob power all around.
Since he said dyno tuned by CAM I knew it was tuned for the 42's.
Basically Rob is saying you bought parts and threw them together instead of matching the setup and thats why its not making any power.
Basically Rob is saying you bought parts and threw them together instead of matching the setup and thats why its not making any power.
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Originally Posted by Mikey 97Z M6
One thing I noticed is that your cam seems to peak fairly low for the amount of duration you have. From the graph, it looks like peak power was made at 6300rpm.
Just for reference, my cam is a LOT smaller than yours at 224/236, and it peaks at 6100-6200. I would think your cam should pull all the way to 6600-6800 without a problem. I think you still have power left on the table.
Mike
Just for reference, my cam is a LOT smaller than yours at 224/236, and it peaks at 6100-6200. I would think your cam should pull all the way to 6600-6800 without a problem. I think you still have power left on the table.
Mike
I do believe that the low power is a result of the huge overlap in the cam with the 110 LSA combined with the VERY poorly(relative to intake) flowing exhaust side on the heads. This is probably causing huge amounts of exhaust reversion into the intake. I would find a cam with slightly more exhaust bias with those heads. Maybe an 8 degree split. Put it on a 112 also.
