[Geo71]

Finally fired up the Chevelle today after getting more parts thrown at it. Changed the 823 heads to the LS3 hollow intake valves, lighter spring pressure Jeg’s .660 Spring kit with titanium retainers and the Caddy race lifters. Sure hope this was the missing link to my lack of power, sure sounds better. Valvetrain seems quiet too.

 

[69-CHVL]

Sounds amazing. So you changed heads altogether for heads that had the lighter valves?

My 6.2 in the Mustang feels amazing all around but who knows, maybe it wont produce all that great a time slip either. But the torque is unbelievable.

 

[Jasons 69 Chevelle]

Sounds good. Have you ran down the track yet. That’s gonna sound crazy at the 7500-8000 rpm for that cam to squeeze the power out of the 6.0.

 

[Geo71]

Sounds amazing. So you changed heads altogether for heads that had the lighter valves?

My 6.2 in the Mustang feels amazing all around but who knows, maybe it wont produce all that great a time slip either. But the torque is unbelievable.

No I have the 823 heads which had the solid valves. Just had the hollow valves installed in them and then put the heads back on.

A guy I race with has a 6.0 in a Malibu with a cam only sbe and similar carb setup. He runs 11.00’s. Mine should have at least run that, but has been a full second slower.

 

[Geo71]

Sounds good. Have you ran down the track yet. That’s gonna sound crazy at the 7500-8000 rpm for that cam to squeeze the power out of the 6.0.

You think it will need that much rpm? Mike said peak power should be 6800. It ran best et shifting at 7200. With new lifters it may be different now. Sounds better at least.

Wot it does sound pretty awesome.

 

[Jasons 69 Chevelle]

Yes my 398 cI LS cam was spec’d by Pat G 239/244 that puts it at 6500 rpm’s
I ended up with a 242/246 by Cam motion 6800 rpm’s is the peak rpm.
I’m running a TEA Trickflow cathedral ports 235cc though so I’ll have a lower rpm peak due to the smaller ports.(that also increases power down low and throughout the RPM range dramatically it’ll give up a tiny bit at the very top compared to a 260cc port)
You have 260cc ports and a 364ci engine.

Pat G will spec a cam for you well worth the money ($25) just tell him what RPM you will be shifting at and crossing the line and a few things about the setup.
Cam motion, Brian Tooley Racing, Texas Speed can do the same I think for free. I’d expect 230-235 intake duration with about 9-12 added duration to the exhaust for those LS3 heads. Seems backwards thinking but these guys do this every day and know exactly what works and how to get the most from your engine.

 

[Geo71]

Yes my 398 cI LS cam was spec’d by Pat G 239/244 that puts it at 6500 rpm’s
I ended up with a 242/246 by Cam motion 6800 rpm’s is the peak rpm.
I’m running a TEA Trickflow cathedral ports 235cc though so I’ll have a lower rpm peak due to the smaller ports.(that also increases power down low and throughout the RPM range dramatically)
You have 260cc ports and a 364ci engine.

Pat G will spec a cam for you well worth the money ($25) just tell him what RPM you will be shifting at and crossing the line and a few things about the setup.
Cam motion, Brian Tooley Racing, Texas Speed can do the same I think for free. I’d expect 230-235 intake duration with about 9-12 added duration to the exhaust for those LS3 heads. Seems backwards thinking but these guys do this every day and know exactly what works and how to get the most from your engine.

With the previous lifters I had shifted as high as 7500, fastest was 7200. Well really anywhere from 68-7200 it ran the same. Was easiest to shift at 7k on the tach which was 7200 on the datalog.

This cam was spec'd by Mike Jones and nitrous, Ive been recommended Ed Curtis by a few LS guys, may try that or Cam Motion if this doesnt work out. Looking at various rect port heads they always have that giant split between intake and exhaust. These heads sure are big almost like a bbc head. Really hoping that the lifter change is what has been needed. Changed all kinds of stuff the past season and nothing made any difference, always ran 12.0....crazy. Sure sounds better now. If it does make the difference then will make a gear change to 4.30's.

 

[69-CHVL]

The intakes just flow THAT good compared to the exhausts is the reason for the large splits. Not that the exhaust is bad at all, its just the intake is THAT good. My cam is 225/238 from BTR. Looking to try a Cammotion myself as this 225/238 cam is a little to rowdy at idle for me personally.

 

[GTO44]

This cam was spec'd by Mike Jones and nitrous, Ive been recommended Ed Curtis by a few LS guys, may try that or Cam Motion if this doesnt work out.

On the LS forums and ford forums Ed Curtis is the go to cam guru. If anyone asks about a custom cam everyone always throws his name out first. He’s very good with LS cams. Really anthing but he’s known for his LS and ford cam profiles. Just fill out one of his cam cards on his website and shoot him an email. He’s pretty quick at responding.

 

[Jasons 69 Chevelle]

Never heard of Ed Curtis.. in the LS world. But as long as he’s not selling huge cams it could be good.
Give Brian Tooley a call also since your running Nitrous.(he actually builds LS engine used at a drag strip) Get a few different recommendations throwout the biggest and smallest.

 

[Jasons 69 Chevelle]

Never heard of Ed Curtis.. in the LS world. But as long as he’s not selling huge cams it could be good.
Give Brian Tooley a call also since your running Nitrous.(he actually builds LS engine used at a drag strip) Get a few different recommendations throwout the biggest and smallest.

I think Mike Jones went through a bigger is better stage like many did. Then a few of the major LS players showed you can run faster times with smaller cams Tooley being one of them.

 

[Geo71]

Its funny when you look at the valves. The exhaust looks so tiny in there. The video of your Mustang sounded good to me. But everyone is different what they want. The Zz502 type cam in my wagon’s 489 is more rowdy than I thought it would be. This LS cam doesn’t seem bad to me. If it was driven everyday might be different

 

[Geo71]

On the LS forums and ford forums Ed Curtis is the go to cam guru. If anyone asks about a custom cam everyone always throws his name out first. He’s very good with LS cams. Really anthing but he’s known for his LS and ford cam profiles. Just fill out one of his cam cards on his website and shoot him an email. He’s pretty quick at responding.

Yellowbullet is where I found out about him. See how this goes when I can either get track time or play with the Dragy first.

 

[Geo71]

Never heard of Ed Curtis.. in the LS world. But as long as he’s not selling huge cams it could be good.
Give Brian Tooley a call also since your running Nitrous.(he actually builds LS engine used at a drag strip) Get a few different recommendations throwout the biggest and smallest.

For now, gonna stick with what is in it and see how it does. It picked up alot on nitrous. [email protected] to [email protected] on 100-125 shot ramping it in over .05. But I would like to see around 10.90-11.00 on motor.

 

[69-CHVL]

Its funny when you look at the valves. The exhaust looks so tiny in there. The video of your Mustang sounded good to me. But everyone is different what they want. The Zz502 type cam in my wagon’s 489 is more rowdy than I thought it would be. This LS cam doesn’t seem bad to me. If it was driven everyday might be different

Funny I think the 224/228 112lsa cam in my 502 and the 225/238 in my 6.2 are too rowdy lol. Its all subjective really, but they do both drive PERFECT. I just hate the car shaking and rattling at an idle.

But again the torque that the 6.2 makes in amazing and I would hate to cut its [email protected] off with a smaller cam.

decisions, decisions.

 

[Jasons 69 Chevelle]

A stock ls3 cam is like a 204/211 117 lsa
There’s a point where torque and power will start to decrease at the low end and increase at the high end. That 225/238 cam is probably the happy middle that Brian Tooley found from extensive testing.(best all round HP/TQ for a specific RPM range) LSA plays into the idle quality higher the LSA (less over lap) the better the idle quality is. A lower LSA number brings the rpm range down but increases chop at idle. The pro’s that can spec a cam properly can get you exactly what you want if you tell them exactly what you have.

 

[Jasons 69 Chevelle]

No I have the 823 heads which had the solid valves. Just had the hollow valves installed in them and then put the heads back on.

A guy I race with has a 6.0 in a Malibu with a cam only sbe and similar carb setup. He runs 11.00’s. Mine should have at least run that, but has been a full second slower.

It’s the cam

 

[300stw]

following this build closely, im doing a 6.0 for a 79 malibu, stg 1 prc heads, 11:8 compression, wiseco pistons, went thru 5 cam companies for suggestions, this is 300lb powerglide car, 5000 stall, 4.56 gears i settled on a pat g 243/250 .629/.615 on a 110, one other cam recommendation was close to this, other cams were in the 225/235 range, same specs given to every company, 6800- 7000 rpm shift points
wont get to the track until june, waiting on a holly terminator to finish up,,,

 

[Jasons 69 Chevelle]

I had a cam spec’d by Jones here is what he cam up with for a 398 ci with a 6500 rpm peak and a 6800 shift point. This is with TEA TFS 235 cnc heads(cathedral ports) This is the largest cam I was spec’d with the only one with this large of split intake to exhaust the rest were all 4-5 more then the intake due to the heads I/E flow percentage. The exhaust flows really well with these heads. Ramp rate are the most aggressive also.

 

[Geo71]

Funny I think the 224/228 112lsa cam in my 502 and the 225/238 in my 6.2 are too rowdy lol. Its all subjective really, but they do both drive PERFECT. I just hate the car shaking and rattling at an idle.

But again the torque that the 6.2 makes in amazing and I would hate to cut its [email protected] off with a smaller cam.

decisions, decisions.

Wagon’s 489 has more idle lope than I hoped, but power brakes still work, it drives easy and gets 17mpg. Can’t complain about that. Now with full exhaust and decent mufflers, its not as noticeable.