Before heads:

- CAI
- Tune
- Pacesetter LTs dumped
- LCAs
- M/T DRs

Resulting in a 12.9@105.6 1.89 60ft. Dynoed 279/310 (iirc, might be wrong. Dynosheet is at home somewhere) before tune/dumps.

Added:

- LE2 heads (with beehives)
- 1.6 Comp Cams Pro Mags
- Used thinner headgaskets upping CR

Results in 85* heat:

1. 13.5@107
2. 13.4@108
3. 13.4@108
4. 13.3@109.7

Horrible 60foots, on street tires, no lcas (long story). Trap speed tells all.

105.6 with mods listed at top. With the addition of heads/RRs/higher CR I gained 4.1 MPH. It dynoed 284rwhp@4000 rpm, but the ignition started breaking up BAD.. I compared it to my old graph after I did the first dyno and it was much stronger everywhere.

I've heard a few questions about the effect of ported heads on a stock cam car and here's your answer. This was with a ****ty clutch so I'm sure 110 is possible. I also don't have gears/whole buncha **** yet.

Oh well, a custom BRE cam and a ported intake are in the garage..

 

put the cam and the intake on it and lets see some 11s

 

Awsome! Many have been wondering what kind of improvements can be seen with just the ported heads Curious how it would do if your ignition gremlins were worked out

 

I'de be willing to bet that atleast half of that gain was from the compression/rockers, so spending $1400 for 2mph in the 1/4 doesn't seem like that big of a bargain to me. But atleats you are going to put a cam in it to take advantage of the heads.

 

The 109.7 trap was with the ignition problems fixed, I fixed them right after that dyno. It was a couple burnt plug wires.



The heads were bought and installed with the idea of installing a cam afterwards. It was a deal and good timing for everything..

 

There should be no question regarding ported heads on a stock cammed car. The results will always be good as long as the heads are ported well. I am even a believer ported heads on a stock cammed car will always outperform a stock head/aftermarket cam car.
Problem is it really cannot be debated with hardly any factual info because it is extremely rare anyone puts ported heads on a stock cammed engine.

 

Air/Fuel while you were on the dyno? Any knock retard? There might be a little more in it depending on how good the tune is.

 

Not being rude but whats the point? now you get to pullit all apart again?

seems like a waste of time to me

 

Ehhh, I just did a cam, and no heads. I dont think it was pointless. Just didnt want to drop all the money at once. I enjoy workign on things so its no biggie for me doing the heads later.

If for no other reason, its kinda awesome that we got some results of ported heads on a stock cam on here finally. Hopefully he will get his traction and ignition issues fixed, and post up a better comparison of before and after.

 

My car had ported heads on it when I bought it and I didn't know it. I was beating full bolton LT1's when I just had a CAI and ws6 catback but I wouldn't go as far to say that when I was full boltons that it was faster than camed only cars. I only went 13.01@105 with it with boltons with 3.23's and the stock stall which is nothing special. It put out 303rwhp. Then I put in 3.73's and the crane 227 cam and went 12.56@111 with a slipping tranny that was bouncing off the limiter with the stock stall.

 

Good to see some times with that. Around 110 mph was what I was expecting. I recently installed ported heads (similar to LE2 heads) with the thinner Impala gasket and 1.7RR. Pulls a lot harder, especially up top, but my opti was missing, and has now gone out. Putting a new one on this week and will try to dyno it within a week or two. I didn't go the cam route yet due to 155k on the motor, heads had to come off anyway due to slight head gasket leak. I'm hoping for at least 330-340 rwhp through my M6.

I never understood why some people thought it wouldn't make power, just look at the LT4, its basically an LT1 with slightly better heads and 1.6RR (yes, I know there is more, but that's the main power difference).

 

Agreed.

I don't think he was referring to cam only cars... there's quite a few of those around putting up much better numbers.

 

I very seriously doubt that.

 

By outperform I mean in every aspect. From 1/4mi to light to light and through the twisties on the street... as in more power under the curve with a far broader torque band using the power much more effectively and getting better gas mileage doing so. I didn't say it. John Lingenfelter did and I pretty much believe about everything he's ever stated about the sbc. Peak dyno numbers mean about dick...

 

Pull what apart? The heads don't have to come off in order to do a cam. Actually there's very little work that needs to be done heads wise therefore I don't see why he'd be pulling it apart "again".... that's unless springs need to be done then I can see your point a little bit.
I dunno... I did it bassackwards and I'm glad I did so I could see the gains made with what Lingenfelter was talking about in his book.