Well I've got my 383 altogether now and after I get all the kinks out I am going to dyno tune it and see what kind of numbers I will put down. I just want some guesses from some of you that are familiar with setups and numbers. Well here's my mod list:

LT1 6.4L 388

3.750" Eagle Crank
5.7" PM Rods (Floated) ARP Rod Bolts
KB 4.060" Pistons (2 Valve Reliefs) (Race Rings)
Clevitte 77 Racing Bearings
CC468 .584/.579
ARP Main Kit
GM Performance Timing w/ Cloyes Chain
LT4 Lifters
CC Magnum Pushrods
CC Magnum 1.6 RR
Crane Cams 10308 Valve Springs
7 QT. System w/ HV Oil Pump
Pacesetter LT's w/ Summit X-Pipe w/ Bullets (Copper Gaskets)
Ported/Polished Heads (Excellent Flow #'s)
Ported/Polished TB
Ported/Polished Intake
26# Injectors
LT4 Knock Module
G2 Cold Air Intake
K&N Air Filter
Castrol Syntec
180 Thermostat
!CATS
!AC
!AIR
!EGR
TB Bypass
Hurst Short Throw
LCA Relocation Brackets
Autolite XP Iridium .045 Gap
Magnecor 8.5mm Wires
MSD Coil
March Underdrive
ES Motor Mounts
ES Tranny/TA Mounts
LG Racing Spring Kit
Chrome Valve Covers w/ Breathers
Ported MAF

Some of it probably will have no affect on the dyno but what do you guys expect my setup to make. I just seen another guy with LE1 Heads and a Cam w/ stock bottom end make 380+ so I think I would be above that with my setup. Thanks for the input, if I remember more of my mods I will post.

 

Heads are a big part of power making. You have a lot of very specific info here, but when it came to heads you just said "ported/polished heads, excellent flow #'s". What heads? What flow numbers? I would guess if all the info is correct and you have a set of heads that flow 300+, then you could easily do over 400 to the wheels. In my 383, with a much milder cam, and good heads, with all the extra bells and whistles, fully dyno tuned I made 425 at the wheels. So you should not have a problem breaking the 400+ barrier either.

 

My father who builds cars from the ground up ported mine and flow 300+, tested!

 

ok first we need flow# and cam specks or this thread is pointless
and no offense but...
flow 300 plus? from lt1 heads? doubt it without professional work, (somebody thats done those perticular heads several times before)
id say no they dont...le3 heads only supposed to flow 295(professional work)
even if they do i bet you have no low end torque or any driveability ect. because not cutting them right can make them only make good top end or good mid range but it takes professional work to get them to work great all around...this is kinda like putting a gm847 in 305tpi and shifting at 5000...it would be pointless and would be ****ty
also you have a stock tb p/p??
also think your pushing the crane 10308's with over 600 lift
finally the 26 pound injectors might be ok, NOT they are prolly at least a 90% duty most of the time

 

My dad does professional work, you don't have to be a professional to do a professional job, I have the flow numbers and if I had a scanner I would post them. I haven't lost anything, they pick up great low, mid, and high. The TB was ported and has two bigger butterflys so that you can port them bigger than just cleaning up inside of them. The cam is a CC468 .584/.579 and that's not pushing much past .600 on Crane 10308 Springs. No problems for me on this setup, just wanted some input on my dyno numbers and guesses.

Cam:

http://store.summitracing.com/partde...5&autoview=sku

Basic Operating RPM Range: 2,200-6,200 RPM
Intake Duration at 050 inch Lift: 242
Exhaust Duration at 050 inch Lift: 248
Duration at 050 inch Lift: 242 int./248 exh.
Advertised Intake Duration: 292
Advertised Exhaust Duration: 300
Advertised Duration: 292 int./300 exh.
Intake Valve Lift with Factory Rocker Arm Ratio: 0.584 in.
Exhaust Valve Lift with Factory Rocker Arm Ratio: 0.579 in.
Valve Lift with Factory Rocker Arm Ratio: 0.584 int./0.579 exh. lift
Lobe Separation (degrees): 113
Intake Valve Lash: 0.000 in.
Exhaust Valve Lash: 0.000 in.
Computer Controlled Compatible: Yes
Grind Number: 292XFI HR 13
Quantity: Sold individually.
Notes: Requires exhaust upgrade, headers, lower rear gear ratio, and aftermarket computer chip. Automatic vehicles will need a 2,500 stall torque converter.


Get more power and torque.
These Competition Cams Xtreme fuel injected camshafts are designed for late model applications. They are ground on a 113 degree lobe separation using faster-opening and more efficient ramp profiles. Xtreme camshafts are engineered for 1.6 ratio rocker arms and beehive valve springs, which provide a dramatic increase in torque and horsepower.

Crane 10308

Number of Springs Per Valve: Dual
Outside Diameter of Outer Spring (in): 1.460 in.
Damper Spring Included: No
Spring Rate (lbs/in): 408 lbs./in.
Inside Diameter of Outer Spring (in): 1.075 in.
Inside Diameter of Inner Spring (in): 0.803 in.
Valve Spring Style: Standard
Coated: No
Retainers Included: Yes
Retainer Material: Steel
Locks Included: Yes
Lock Style: 7 degree
Lock Groove Quantity: 1-groove
Lock Material: Steel

These springs have been proven on 500HP LT4's and cars with even more HP than that with wilder cams.............Never had a problem.

 

i can bet ya that those 26#ers arent going to be big enough
im gonna be selling a set of 30 lb redtops if youre interested

 

Couple of comments. First I agree that your 26# injectors are going to be to small. Bite the bullet and at least get 30 pounders as said above. That is an excellant cam and can get the horsepower for you. Sounds like you have good components for the valve train. I'm just not familiar with the Crane 10308 valve springs. Most people that use that cam use the beehive valve springs. Sounds like you have done your homework and going by that I would assume the springs will do the job. With a proper tune you should be well past the 400rwhp mark. One after thought is you did not list the compression ratio or your quench.

 

Compression is around 11.7:1 Running on 93. The springs are great, I will probably move to a 58mm TB and 36+# injectors. My TB is custom 52mm.

 

If you dad got 300cfm out of those, that is absolutely amazing.
They certainly outflow anything I've seen on a bench.
I'd love to see the flow sheets and pics of the work.

 

Yea I will try to get the numbers scanned but I have to get someone with a scanner. Anyone know the flow numbers of LT4 heads? I was just wondering what they were compared.

 

A guy down here that ports in his garage gets 306 out of a set of stock castings,but the pushrod pinch is welded up.
No problem with 300+ from the heads--- what does the intake flow? Remove ALL the restrictions from the intake path, intake,TB, CAI,filter,ect. Big filter(12") at least a 58MM TB, K&N CAI,heavy ported intake.(the intake will loose ya 12-15% of your head flow if it's stock).
Don't listen to the BS about the runners being to big--- Ya can't put to much head on it,and that's a proven fact.
Unless that cam has an earlier intake closing than I give it credit for your DCR is going to be low leaving HP on the table.
I run 42# with 50/52lbs fuel pressure to make my HP and that's barely enough.
Your cam is a bit small to go much over 425RWHP IMO.
What is your quench distance? It should be .035-.040 for max effect on helping with eliminating detonation.

Not trying to bash ya,just trying to point out some things that may be able to be changed fairly easy and not cost a bunch and make for a stronger engine.

 

My friend (Fastbird93) has a set of Trick Flow LT4 style heads he had fully ported that were flow bench tested at over 320! (more than my fully ported AFR's )

 

ok well since no1 believed me and keeps telling you that the more ported the better i thought id give you a thread from the REAL PROFESSIONAL...lloyd elliot
http://web.camaross.com/forums/showthread.php?t=411824
""flow #'s are NOT AS IMPORTANT as runner shape and measurements in key areas of the port.""

 

I'm with the other guys on this. An honest 23 deg 300+ cfm heads is extremely rare. I've seen many "300 cfm heads" flow 260 - 280 on a good flow bench (Thunder Racing's). If you have a flow sheet showing over 300 cfm, then the flow bench is wrong.

If your Dad got over 270 cfm out of LT1 castings, then he's an expert porter who needs to quit his day job and port heads for a living.

That said, I still think the combo will make over 400 rwhp because of the cid, compression, and cam. I hope the intake is ported right. . .

Mike

 

Anyone else?