For those who are just tunning in this post is a continuation from a previous post
concerning track result with my new engine ran in all street trim, tires and all.

Pat Kelly since the last time I spoke with you my chevelle ran a 13.6 shifting at 5800RMP
and a MPH best of 99.67 due to engine starving for fuel, I have changed the back two jets
from 78 to 80's. My first run with the new jets the chevelle ran a 13.502 at 101.00MPH with
a 60 foot time of 2.0832. Next I went two jets up in the front from a 71 to a 73 and my first
run with the jets landed me with a 14.2 at 104 MPH with a 60 foot time of 3.074, bad start,
my second run with the jets landed me a 13.206 at 103 MPH with a 60 foot time of 2.033.
I can only get four runs in because of a race the next day so tunning was limited but
this was a fairly big improvement compared to last weeks run. I really believe that if I can
get my sixty foot time under 2.0 then I should get 13.00 flat or 12.99, with more tunning
I should for sure get high 12's. Oh by the way found out my stall converter only stalls
at 2200RPM, suppose to be 2400 but you know how that goes, anyhow my cars power band does
not make real power until 2800-3000 RPM.

For those interested in the combo here is my engine combo
Engine 350 .60 over
camshaft CompCam XE 274 hydraulic flat tappet
Heads stock GM casting bowl ported, five angle valve job, 2.02 valves 1.6 roller rockers (flowed 260)
Carburetor Speed Demon Mechanical Secondaries front jets #73 rear jets # 80
Ignition MSD 6AL with MSD Probillet Distributor 35 degre total
Headers Flowtech
Intake Edelbrock RPM Air_GAP
Transmission 700r4 with 2200 stall Lock-up
Gears 3.73 posi with 10 bolt
Tires Nitto 555R 275 45 on 9.5 rim
Suspension Spartan tubular A Arms, 1.25 front sway bar, 1 inch rear sway bar
Brakes 12 inch camaro 1LE cross drilled slotted rotors
Spring hotckis front and back
Shocks KYB all around

Im about to order the xe 274 cam. Do you recommend it for a fast street car for a motor similar to yours?

Blaster I need more information about your motor and the complete car set-up, because the cam
is nice cam but your heads will be the deciding factor on how fast your car will be.
I like the CompCam 274 XE and there are a lot of other cams that have similar profiles that
will probably make the same horsepower or more, but I believe my heads are the key.
I recommend that if you do ran this cam you at least have a stall of 2200RPM, spring
equal to or better than z28, gears need to be at least 3.42 or greater recommended 3.55.
mechanical secondaries carburetor such as HP or BG. This is a dual pattern cam that have
very rapid valve speed open an closing creating noise that produces a lumpy idel, sounds
great, I have heard many people go with the 268 XE cam so that maybe an option for you
but I wanted the 274 XE and glad I made this choice.

P.S I will be posting my dyno sheet before changin jets later today.

What size carburetor? Are you running flat top pistons also?

Robert I am running a Demon 650 and my piston are Keith Black hypereutectic pistons 9:251 compression

I was curious,my son is running a 650 Holley with stock jets....72 & 76's I believe...I've told him to try jetting up a little to see if there's any improvement. He's running the same cam,vortec heads,.30 over 350, air gap, 3.73's ina 81 peekup. He's run a best of 13.50-13.51 with it. Of course the truck won't 60ft at all,best is 1.94.

the heads i will be running are the edelbrock rpm's and 10:1 compression. 3:73 gears with 2400 stall

Blaster that sounds like a good combo you should have a pretty nice set-up, if you can get it dyno tuned to get a ball park figure of your horsepower and torque.

Rapid Robert its hard to compare heads if they have not been flowed but vortec heads are great for the money, the sixty foot time of 1.94 is better my best which is 2.033. Every engine and combo is a little different but if your sons truck is hitting 13.5 that damn great for a truck not even ford lightning or the 2004 chey SS with super chargers run that fast. I had the engine dyno before my adjustment and I know that I can shift past 6000k and still make power, I really want to shift at 6200-6400 RPM's and if I could leave the line at 2400 RPM's then I am for sure high 12's, but I am not a good driver yet!

If you went from 99.4 (your previous post) to 104 that is a huge increase in power. I figure it take roughly about a 10hp increase to increase speed one mph. Too bad you didn't get more passes.

With improved traction, 12's are in your future. Each .1 second decrease in 60' time is worth between .15 and .2 seconds decrease in ET. Loosening up or removing the front sway bar (just for the track) will help 60' times. Since this is a street car you really can't optimize the suspension for the strip but if you could, you would likely get well into the 12's.

Pat I feel 12's man graemlins/thumbsup.gif I know its around the corner if I can work on my launches and a little more tunning it should be very possible, I think 104 MPH should do so!

those are really good numbers. i have the 274xe solid version and i love it. graemlins/beers.gif

1fast69Chevy

Thank man! I will be going out to the track next month and also chassis dyno. Hopefully I will get into the 12's next test N tune.

Nice set up...wish my car would run that good :(

LXS the cam 12-677-4 (XS274S) has a lift of .501/.510 compared to my (XE274) .480/.490 lift. The valve lift will be greater with the mechanical set-up and you should be able to make power at higher RMPS compared to the flat tappet hydraulic set-up I have. I would guess that the XS274S would sound a little more aggressive than the XE274, but then again the XE274 sounds pretty stout as well. I am sure it will perform great in your engine as well as mine, but the only difference that I can see is the fact that it is a mechanical cam which should make a little more power at higher RPM's. The mechanical may require valve adjustments compared to the hydraulic set-up.

I don't think you can go wrong with either cam a matter opinion, but if you do not want the adjustments then go with the XE274.

Sorry if I made you read my post, then to see that I changed it...I figured that I didn't want to high jack the thread, so I figured I might as well make my own post. Thanks for the respone graemlins/thumbsup.gif I've got a no name brand cam in my motor right now (don't remember who made it, but it wasn't anyone like comp or crane). It has a .488" and I don't remember the rest of my specs. As for valve adjustments, I got poly locks that don't lock, so I'm constantly adjusting them anyway...so it won't be a biggy anyway tongue.gif

Hey.....I am kinda new here. I am running a 350 with a Holley systemax kit
( heads, cam, intake,ect) I have the same lift on my lunati cam as you . What duration at .050 are you running? I am at 235/240 on a 112ls. I did not catch what car you have this in.....what does you chevelle weigh?

I have a 69 camaro ....3500lbs with me in it. Holley 750 pro series carb. I just had my car dyno'd and it showed to be lean. So I will jet up to what you have. I am currently 72 square (not factory) What were your times in the 1/8th mile? I only have an 1/8th mile track here.

My best is 8.202 on nitto's with 1.88 ---60'time @ 84.5 mph. Its good to compare notes with someone with a similar set up....but I am running a th400 tranny with a 2700 stall

SSMAN69 I have a 67 chevelle and my cam is on a 110 lobe and my duration at .50 is 230/234 so your cam will be a step higher in the XE line of cams.

Originally posted by Spawn22:
SSMAN69 I have a 67 chevelle and my cam is on a 110 lobe and my duration at .50 is 230/234 so your cam will be a step higher in the XE line of cams. What kind of 1/8th mile times did you have?

SSMAN69 I am don't have my time slip with me at work, but I am sure it was not as high as your 84 MPH I think my MPH was something like 82 MPH.
My slip read something like this of the top of my head.

Reaction time: .233
T1 (60 foot): 2.033
another number: 82 MPH
Last trap: 103.32 MPH
Time: 13.207

Originally posted by Spawn22:
SSMAN69 I am don't have my time slip with me at work, but I am sure it was not as high as your 84 MPH I think my MPH was something like 82 MPH.
My slip read something like this of the top of my head.

Reaction time: .233
T1 (60 foot): 2.033
another number: 82 MPH
Last trap: 103.32 MPH
Time: 13.207 Our combo is not that far off from each other. I am just trying to see how far off tuning I am. Actually we are running about the same..Which means you have a better tune on yours. If my 60' was the same as yours.........they would be about the same as far as times go. I hope you didn't think I was trying to boast or anything like that. Just trying to educate myself. ;) I am not much of a tuner. Just know the basics. Thanks for you insight graemlins/thumbsup.gif

Hey no offense taken I enjoy this post and glad to hear people like us chatting. I am no tunner either graemlins/sad.gif , but I have had the chance to take the car to the track and see the improvements after a adjustments. However I am happy that I checked my plugs and they look perfect, and I say this because with my last engine I always fouled my plugs, found out I had a bad thrust bearing and so the engine had to be totally rebuilt.

I think both of us will get the cars tunned to the happy respectable point. I won't stop until I get a good 60 time of 1.8 or better which should put me in at 12.9 or 12.8. I will keep you all updated next month as I head back to the track to do another test N tune but this time I will do timing adjustments!