Built LT1

iTrader: (3)

My first 383 cam was the 503 from comp: 224-230 112 LSA with AFR 195 LT4 "race ready" heads. Flow 260 cfm @28 inches of water. This combo made 370 rear wheel with A4. I'm still using the A4.

My builder called me and said my 383 will be done next week!

The new cam specs is as follows:

Custom Grind Comp Cams Roller
.637 Intake and .647 exhaust; lift with 1.6 rockers
Duration @.50 266-272; ADV 310-322
106 LSA


Heads: AFR 210 LT4 w/2.08-1.60 valves professionally ported and assembled with K-Motion springs. Flowed 313 cfm @28 inches of water at Westech Performance in Mira Loma, CA

lt1taracing

props, you should see a huge improvment. i may be wrong but i believe those are the same heads as overton's running on his car.

Built LT1

iTrader: (3)

I just hope it makes more than 370. I don't know who overton is but I hope he is getting good results. My last motor was a little disappointing considering it was a 383. It ran 12.49 @111 without N20.

lt1taracing

mine runs 11.1s all motor with heads that flow around 260@600. and a 230-236 576-571 comp. hyd. roller. i was refering to joe overton. red 94 t/a he's been in alot of the gm hightech mags. it runs 9.3s all motor in the 1/4. 5.9s in the 8th.

Built LT1

iTrader: (3)

11.1's all motor!? I'd take that. I thought my last LT4 383 would run high 11's at 117ish and I sorely over estimated. I don't want to get my hopes up too much.

lt1taracing

i think you'd see a big improvement going to a turbo 350 with a good t/q conv. mine was about a half sec. slower in the 8th with the 4l60. i also had a conv. with it aswell.

Honda Hunter

iTrader: (8)

I look foward to seeing what you make. I like the setup.

titter

iTrader: (5)

awesome flow numbers ... cant wait to see what it makes as well.

streetrod93

iTrader: (8)

you don't know who overton is????
if we're both thinking of joe overton...well, let's just say he's made a few cams that pull pretty hard....

he's one of the best custom cam grinders around these partrs....(not to say brett is awesome himself) but joe does fantastic work.

motor should be REALLY healthy...make sure to get some video with sound of that bad boy when it cranks up

Old SStroker

IMO, you have WAY too much cam. I suggest you'll be about 50 lb ft down @ 4000 compared to a cam that peaks the same hp within a few %, has only about 60% of the overlap and gives twice as much idle vacuum as well as more average torque and hp. Great flowing heads, as you seem to have, don't need huge cams.


My $.02

Built LT1

iTrader: (3)

Too big of a cam?...That's exactly what I thought also! Apparently, the flow numbers along with compression and other vital information was given to the people at COMP CAMS and this is what their model suggested. I fell over when I heard the specs and wondered if this would even run! One more thing to consider however is that it is a SOLID ROLLER; and others have told me that it would act smaller than say a hydraulic at those specs. What do you think?

Built LT1

iTrader: (3)

I am concerned that it may be too big, I wonder what Joe Overton would think about it? This new motor is 388 cubes (4.060 bore 3.75 stroke) and it is supposed to be a DAILY DRIVER with street strip power and nitrous in mind.

96blkform

iTrader: (2)

Sounds like a very nice combo, for a dialy driver it might be a handful

Built LT1

iTrader: (3)

Thank you for the compliment. I too look forward to seeing what it makes. I wonder if anyone will post a rear wheel guess based on what they have read on similar set ups.

streetrod93

iTrader: (8)

i think that with that many inches, the cam will "hide" some of it's size. we just finished up my friends 358 that had a cam in it almost identical but with just a little less duration. the car drives fine and pulls like a god.
i replied to this on z28.com too giving my opinion, and i don't think that cam is too big either....just spend some serious time tuning, and you won't have any trouble with it.

as for the daily driver thing, maybe not the ideal setup, but it can be done, gas milage is gonna be really good :-)

trust me, you don't want to under cam those heads, the AFR heads are amazing heads, and you'll see some very impressive number higher in the rpm range with that combination.

IF you had to change it, i would pull the duration down a little, which in turn is going to start making power a little earlier and peak just a little earlier, but i like the lift, it's at a good spot for those heads, trust me, i've got the same heads on a 355 and the lift is just under 635 on both sides.

in other words....shove it in a see if you can't break a tranny or rear end :-)

streetrod93

iTrader: (8)

hit me up with a pm and i can run those specs through the new desktop dyno program and give you a decent estimate of flywheel horsepower...

jeff

Built LT1

iTrader: (3)

Thanks...pm sent.

Old SStroker

I did look at it as a solid roller. The predicted idle vacuum was about 5-1/2 in hg. I suspect the port volume in now quite a bit more than "210" to get the 313 cfm and feed a 383.

I still think it's too big, but I am a proponent of "less is more" when it comes to valve timing.

Just for grins, what lobe numbers did Comp suggest for this stick? Also do you have actual flow numbers for all lifts?

Shon Herron

iTrader: (25)

Joe doesnt grind his cams. He specs them but has another company grinding them.

DeltaT

iTrader: (5)

Even for a solid roller, IMO it's huge especially for an A4. 388ci isn't going to make a cam that size seem too much smaller. Maybe a SBC 454, but not 388. And the whole thing on a 106LSA? To me that's an agressive road racing cam for an M6.

Jim