Thinking of buying a 383 this winter (already built by Carolina auto masters. its on CL). Here are the current specs on the car:

Speedpro Pistons and rings
eagle crank and rods
Ported Intake
Ported Heads (Well done, flow very similar to LE2s)
Comp Cams XE 230 / 236, .510 / .520 112 LSA
30# SVO's
11:1 compression
mallory ignition
edelbrock AFPR
1.6RR
Full exhuast (Longtubes, no emmissions, not cats) 4" catback and all other bolt-ons
TR55s
OBD1 Tuning by PCM4less
6 Speed w/ zoom clutch and lightweight flywheel

The car still has the stock TB. My plan for this winter project was to run a bigger cam (the one in there is kinda small for a 383 correct), larger injectors, and a 58mm TB. The valvtrain is already all set for me to throw a bigger cam in there so why not? My question is, what Cam would you guys recommend running for best results? Maybe custom grind? I was hoping for 450-500rwhp by spring.

Suggestions?

 

id go with a custom grind dyno it first to find out where you stand with air flow

 

to hit 450-500rwhp your going to need way more cam, most likely better heads, and a monoblade or something along those lines.

Id say that current setup is good for 390-420rwhp depending on many variables. With some more cam you could do more but again, thats going to depend on many things.

Cam, i would go gm 847, cc306, something that sized. A custom grind would be your best bet. Look into AI's custom stuff, all the ones ive seen have put down good numbers.

Is the bottom end forged? 4 bolt? These things are going to limit your rpms so i would figure out if they are or arent.

 

bottom end is not foged but its all new eagle stuff with just over 1000 miles

 

with the M6 i think it should be right around 400rwhp as it sits now. I hoping with a bigger stick i can make a little over 450 which i definately think is possible

Does anyone make a monoblade for the LT1?

 

As&m does. What about the mains? I would spin it past 6500rpms without some extra support.

 

steel cranks shouldn't be used with more than 450 hp or 6800 rpms anyways. Just my opinion, and I know some weill say "I have run it and been fine", its your money and your gamble, if it were mine personally I wouldn't gamble with it.

 

any other cam suggestions? Im looking at a custom AI cam right now.

 

From AI's website: these are their cams i am considering in addition to cc306 and the gm847. How much more expenisive are their custom grinds? Also,
is the biggest AI cam there (on the bottom) going to have decent driveability?

Also what would you guys reccomend for injectors? There are 30# svos on their right now.

Ai 226 / 234 - .540/.575 - 110 LSA Primary Operating Range: 2000-6200rpm
This is our largest stock long-block cam for auto cars. Lopey idle, good drivability, and excellent mid-range with peak power at approximately 6200rpm. Properly tuned w/ supporting modifications, M6's typically produce 345-360rwhp SAE corrected.

Ai 230 / 238 - .575/.575 - 110 LSA Primary Operating Range: 2300-6400rpm
This is our largest stock long-block cam for M6 cars. Excellent for rebuilds with 11:1 compression. Lopey idle, good drivability with gears & tuning, and excellent mid-range with peak power at approximately 6300rpm. Properly tuned w/ supporting modifications, M6's typically produce 350-365rwhp SAE corrected.

Ai 234 / 242 - .575/.580 - 110 LSA Primary Operating Range: 2500-6600rpm
This grind is best suited to 383 rebuilds with 11.0-12.0 compression. Lopey idle, fair drivability with gears & tuning. It produces excellent mid-range and top-end with peak power at approximately 6500rpm. Ideal for budget street/strip 383 rebuilds with 3.73+ gears and 2800rpm+ converters.

 

need to know more about the set up (what springs, set up ht, seat pressure, open pressure, etc) but a different cam will be needed for your RWHP goals.

If they actually flow like LE2 heads and have a 2.10-2.15" measuerement at the PR pinch with a 200+ intake port you can se the RWHP goals with the right cam.

Lloyd

 

Hey Lloyd, I think you responded to my post over on ls1lt1.com as well. The flow numbers are as follows in 28" water:

lift int exh
100 76 68
200 132 112
300 188 138
400 236 166
500 264 188
550 274 196
600 280 204

this is what it has for valvetrain

Comp Cams Pro-Magnum Non-Self-Aligning Roller Rocker Arms, 7/16" stud, 1.6 Ratio
Comp Cams 1.430" Diameter Double Valve Springs
Comp Cams 10 Degree Titanium Retainers for Comp #987 Valvespring
Comp cams 7.200" chromoly pushrods

Lloyd don't you guys do custom grinds as well?

 

Just my opinion but I would look at a wider LSA on the cam.

 

wider means lower LSA right? I was thinking 111 or 110

 

i would go with the 230/238 on 110. It will keep the shift point around 6500,6600 rpms. You dont want to spin the motor any higher.

 

Yes lloyd does do custom grinds aswell. His setups do very well. I can vouge for them. the le1 heads with le2 cam never stopped pulling on the dyno. the only reason the guy tuning the car stopped it around 6500 was because it had the stock bottom end in it.