Sorry to beat this to death.

If you had all mods done besides heads, what cam would give you the best possible track times with 4.10 gears, M6, and stock heads. Oh yea, and 1.6 roller rockers and 11.3:1 compression ratio.

I ask again because I have not yet got a definite word on which cam I should get. Also, I am not sure if anyone could actually tell me what the "best" cam would be for the best possible track time.

 

Track times throws in to many other variables, such as driving skill, suspension setup, tires, air temp/altitude.

 

I'd say a custom cam made just for drag racing. But the result might sacrifice alot of drivibility amoung other things.

-Dustin-

 

I agree on the custom cam. But since you have home ported heads(right?) its impossible to tell what cam would be best cause they're not stock anymore. The only way to get the BEST cam is to have it matched to the flow numbers of your heads.

 

Ok, fine. What is the best "off-the-shelf" cam for the best track times. I have the 847, but some people are saying that the 306 would actually get better times.

And this is cetirus paribus (all things being equal). This is considering that the car is fully built with a 12-bolt and drag slicks.

I've almost decided just to port the darn heads myself. I definitly can't pay 1000 bucks to get it done, and I don't think it would be worth it to get a custom grind cam for stock heads. Streetability would be absolutely gone, right?

 

If i remember right the fastest cam only lt1 is running on a cc305 or something small like the 305. But i think if you got everything tuned right got good traction...you wouldnt notice a big diff in cams.

Moral of the story is....keep the cam you've got, keep the engine you've got but make sure you get it running to its full potential. Get some track times and get your current setup optimized dont worry about cams untill then.

 

There are a number of guys who've run low 12's and even in the 11's with stock bolt-on-only engines. What is your goal?

If you do go to swapping a cam into the thing, just make sure you don't get too crazy on the duration. Talk to a good cam guy.

-Mindgame

 

HOw do you get into the 11's with a bolt-on only engine?

 

With lots of track time and a car that is set up just right. the only way to set it up right though is to get it to the track.

 

I think you are fine as far as cam goes with a 847, I have the same 847 stock heads,stock bottom end and I hang right with my buddy's cc306/383 in the 1/8 mile, I actually have a little more mph but he has me by about 2 tenths. He also has a little bigger converter and 3.73's to my 3.23's. I think switching to a cc306 would be a waste and a step in the wrong direction. How about getting it on a dyno and getting the tune dead on?? From there I would look to suspension and maybe some more home porting of the TB and other little things. I too mod on a budget and have been pretty good so far, the little things will add up.

 

I opted for a custom cam from Bret, for my stock heads, cam only try. I got as far as 12.29 @ 112mph with only bolt-on's. A cam should put me well into the 11's..

I would add all the bolt-on's to your car to meet your goals, with a cam.

The fastest cam only m6 was running the gm 847(ajtar-11.9 ), while the fastest A4 was running the crane 210/224(frank95z-11.4 @116mph), it is a small cam.

I might think about pulling the heads and have them flowed then a cam built to match, if you have the cash. You can hurt your power porting them yourself if you don't know what you are doing. JM2C

Now if it were me, i would just put in the gm847 since you have it and all. IF it seems to be off pace, then i might think about pulling the heads. I dont have alot of budjet to do it right. Toss the cam in and take her to the track.

 

I thought there were guys with the 847 running 11.5 on stock heads. And an 11.4 with a 210/224?! What other mods does this guy have done?!

 

i knew a guy who broke into the 11's with just bolt ons and was using the LT4 hotcam. there are so many more factors that will lower your times other than just horsepower. if you've got every bolt on plus the 847 cam, i'd spend some money reworking your rear suspension or if you're on stock gears or converter play around with those. you'll pick off more time than just switching cams.

 

His screen name is Frank95z
95z-28
a4 stock heads
52mm tb,cold air, hooker LT,crane 210/224 1.6rr , strange 12 bolt, Qt pros, VIg 3200 stall
1/4 mile 11.40 at 116.59
60ft 1.483

 

Isn't that supposed to be 11.4 @ 116.59?