00pooterSS

iTrader: (40)

ahhahahhah

KW Baraka

iTrader: (7)

You need a good tune under street driving conditions, and NOT just on the dyno.

KW

big hammer

21.5* overlap shouldn't be too much on a 416 and be able to get rid of most if not all the bucking. Takes some street tuning though

Boback1

Yeah I don't mind a little surge it's the crazy bucking that's killing me. But once I get the motor pulled apart and see what went wrong I'll make my decision there. Might even go slightly less overlap on another cam. Maybe go down to one with 17 or 18 degrees of overlap.

JakeFusion

iTrader: (7)

Won't make much difference. You'd have to get below 10 to notice it.

NEstyle

iTrader: (1)

Put an auto in it lol.

Tuskyz28

Unless you spraying nitrous on your setup in my opinion you have to much of a split on the duration between in the intake and the exhaust. I've seen Pat G spec a cam close to setup and the cam only had 4 degrees difference between the two sides and it performed well on and off nitrous.

big hammer

Those heads don't really need that much split but I don't see it hurting either

JakeFusion

iTrader: (7)

Brian and Geoff have been spec'ing more split on the TFS 235/245 heads and making more power with them. So meh.

neblackshirts

I'm running a lq9 408 in my 01 Camaro and according to overlap calcs online I have 25 degrees of overlap. My cam specs are 243/251 .624/.624 111lsa and like others have said it takes time lots of time to straighten out drivability.


I took my car into one local shop that does a couple of big online guys cars to get a quick look into the tune as it was running pig rich and had a tough time idling, would just die at stops. Well after about 3 weeks sitting at this local shop I was told car was ready and holy crap it was surging so bad I thought it was a Nitro funny car. RPM was swinging from 600-1500ish about five times then would smooth out but did this every time I came to a stop. Went straight back and was told "Big cam that's how they are" BS. Didn't go in surging but left that way.


Second shop about 400 miles from me spent lots of time tuning things out and was driving great in that area it was tuned in. I didn't think that about 4000 ft elevation change would affect my new tune as bad as it did. So once I got my car home to a much lower elevation and overall climate it needed some attention.


Well then I got much needed help from guys on this forum especially from @Darth_V8r. He looked at my tunes as we sent them back and forth and got things running night and day better. I ran out of free time and weather changing that has held me back on further tuning that's needed.
Point is car is much more drivable, surge is minimal, and it has been a couple year thing that just takes time. But I'll also add that something I've learned from all this is if you're wanting to spend more street miles than track miles a smaller cam will make those street miles much more enjoyable.

big hammer

Learning how to tune yourself is ideal. Baby steps for a guy like me but I can do it now. Darthv8r is the man

neblackshirts

Learning for yourself is worth a lot. I know of older guys that built big blocks and raced all there lives but make the switch to EFI and say "man this is a whole new game". Setting up motors with a laptop over hand tools is a game changer that doesn't get mastered overnight.

G Atsma

I would say, once tuning is learned via laptop, it has it ALL over changing carb jets and advance springs REPEATEDLY. It's a whole new world!

LilJayV10

iTrader: (39)

fix your mechanical problems. You can't tuned around fucked up.

A.R. Shale Targa

iTrader: (2)

Should have it honed to 4.075”; new Mahle slugs, and run an air pump
Push rods and valve springs could also need updating

A.R. Shale Targa

iTrader: (2)

My buddie’s 417” runs that BTR 239/254 stick with well balanced PRC 255 LS3 heads and he loves it. In a stick GS Vette has no bucking at low speeds
Fair amount of street tuning to get it there

Boback1

Thanks for the info fellas. motor is coming out this weekend. I am thinking about switching to the cam motion stroker cam. It's the hot street stoker cathedral Ls cam. 242/246 114+3. Have any of you ran this cam ?

Darth_V8r

iTrader: (4)

I have not run that cam specifically, but I am currently running a 247/255-114+4 in a 428, and while I have not had it on the road yet (waiting on parts), I've been able to get it to idle very steady and return to idle after a few WOT stabs in the garage, so I'm pretty sure it'll be streetable. Was also able to get it to idle at 875.

So, short answer, I think that cam will do great in a larger cube, cathedral head motor

Boback1

Awesome thank you for the info. I was hoping you would reply. I would love to pick your brain about a few things . Dan In the west coast (navyblue) on here told me your the man with this stuff and suggested I ask you.

big hammer

Most tuners don’t take the time necessary to really make the driveability right. They just do what they always do and if it doesn’t work properly they just blame it on the combo and not their tuning

Like most tuners say you can’t get a light clutch to idle right. WRONG