luckyhenriksen

iTrader: (1)

Hey, I am planning my motor build and need advice on the cam. It will be a stock bottom end 6.0, L92 heads, GMPP intake and an 850 carb. I want to run the biggest cam possible on the street. It will be paired with a TH400. Andy advice?

TJ

iTrader: (10)

stock bottom end 6.0 with a 2.16 valve is going to limit how big you can go, IMO.

tillery

iTrader: (4)

What type of Carb? Mechanical/Vacuum secondaries, You going to swap the coils for a distributer? What the intended purpose. Compression ratio running, weight of vehicle?

luckyhenriksen

iTrader: (1)

Going in '68 Chevy truck, weight 3700, street/strip use, keeping the coils, MSD ignition controller. 3:73 gear set, looking at running a 750 or 850 Demon carb

TJ

iTrader: (10)

dont know specifics, but i bet whoever in the know specs a cam for you, its going to be .23x .590-.60x

luckyhenriksen

iTrader: (1)

Could I call a company like COMP and ask them to recommend one?

luckyhenriksen

iTrader: (1)

How easy/expensive would it be to upgrade the springs to handle a bigger cam?

TJ

iTrader: (10)

patrick G on this site does cam recommendations. PM him.
as for springs. if you have the right tool, and you are mechanically inclined, its a no brainer.

Shawn MacAnanny

iTrader: (12)

I would say a 750 carb. That's what im running on my 5.7L. I just bought an 850 Demon for it which i know is over kill but it'll work fine. I would reccomend a vacuum secondary carb for your set up too. Actually i'll be selling my Holley 750 already tuned for a a 5.7 and id make a few adjsutments for your engine so it'll be pretty close to what you'll want. I rebuilt it about 200 miles ago, has new 50 cc aceltor pump, new electric choke, has adjustable metering plates now (no jets) but i'd reccomend going back to jets. Something like 74 primaries, 78 secondaries, a silver vacuum spring, it has a #34 squirter with hollow screw which should be abour right too.

Also as reccomend the 226/242 cam is a pretty good recommendation although i'd run a little more intake duration like maybe 230. The exhaust is pretty restrictive but not super restrictive. I dont think you'll be running cats or a restrictive exhaust system either so that should help the heads breath a little there too.

1997bird

iTrader: (2)

With his stock bottom end he will more than likely run into major PTV clearance problems with the 2.165" intake valve at 230*.

Shawn MacAnanny

iTrader: (12)

Haha i wasnt even thinking about PTVC. I forgot how big the L92 valves are. He could always flycut since he's going to have the heads off but i doubt he want to go through that work.

luckyhenriksen

iTrader: (1)

No not wanting to go through fly cutting and all, thanks for the recommendation. Where should I look for a cam with those specs? Oh and I will be running headers and straight through mufflers, so no restriction there.

luckyhenriksen

iTrader: (1)

And thanks for the heads up on the carb size, I was just gonna see what I could buy used for cheap, either size is fine with me, although I think 650 might be a touch small, JMO

luckyhenriksen

iTrader: (1)

I sent an email to Futral, I like the looks of their products.

59rat

iTrader: (5)

I'm running a LS2 with L92 heads 850 db 28.8" tire about 3500lbs in a 80 Malibu wagon. My cam is a comp 595/598 232/234 112 its got a good lumpy sound, it loses a little down low but makes up for it up top. The 370s you talking about I had and changed to 410s with a 4000 stall and it woke this thing up big time. It was way to doggesh (is that a word) with those 370 gears. Look in Hot Rod mag about 2/3 months ago they did a 7 engine test in a Chevelle the stock 6.0 with 28" slicks they ran 4xx gears and a 5100 stall (I may be a little off on this) and it ran in the 11s. I also went thru the traps at 5200rpms with the 370s and this thing is good to 7200. Rod

luckyhenriksen

iTrader: (1)

Ok, thanks for the heads up, I might need to look into deeper gears, eventually. I read that article and thought it was very cool. How high of a stall can I go with it still being streetable?

1997bird

iTrader: (2)

I would run a 3500 stall and stay with the gears that you already have. Until you can take advantage of more intake duration you should have gobs of TQ to get you down the track.

luckyhenriksen

iTrader: (1)

Will the stall be based on the power band and HP/TQ numbers my motor produces?

1997bird

iTrader: (2)

Yes you want it to stall pretty close to your peak TQ #'s. Here is a thread to look at that has a cam similar to the one that I gave you. https://ls1tech.com/forums/dynamomet...2s-06-gto.html I would also advise you to talk to Ed for L92 info.

luckyhenriksen

iTrader: (1)

So then I should wait til I dyno the motor before choosing a converter