regorih inHous.

I know that you need to match your heads to your cam but, what if you already have the cam, and dirent match the heads or springs to the cam? How do you find out what heads, and springs will make the best of the cam already in your car? This is what happend to me. First I was doing a heads and cam stock bottom end LT1 with stock ported heads and a CC306,long story short- I spun a bearing and bought a 383 . I them bought a coustom gind cam and a lot of parts. Anyways this combo proved to suck a **** load. Thats why i need everyones input to tell me what is wrong and what needs to change! I will beging to list every fu#*en thing thats on the motor There is a misfire somewere but i cant find it. At night you can see the plugs on cylinder #1,7,2,8 glowing ?? And there is a weird knock coming form the motor? But its not the rods or bearings, i pulled the oil pan off and looked at everything and it looked fine. Im starting to think that it might be the springs because there not for the FMS custom grind cam. What do you think? The spings pressure rate was set up for the CC306 not the new cam .


First the springs.
CompCams Double Valve Springs
Spring O.D.: 1.430" doubel spring
Seat Pressure: 138#@ 1.750"seat; 325#@ 1.250" open
Valve Lift: up to .600" Coil Bind: @ 1.150"
Rate (lbs./in.): 344 lbs/in
Custom Grind Cam<FMS
Grind#:X237/244/12
Lobe size bc/ht IN:1.055 EX: 1.050
Camshaft Date=4 CRNK DEG
DURATION AT .05 In
INTAKE-Rocker Ratio= 1.6
Lash 23 24 25 Hyd. In
Exhaust-Rocker Ratio=1.6
Lash 23 24 25 Hyd. In

INSTALL CAM ON ** below Cyl#1

Intake & Exhaust
Lobe Separation = 112.1 CRANK DEG
valve overlap= 18.5 CRANK DEG

INTAKE
valve open = 11.6 `BBDC
* CENTERLINE---> 108.1 `ATDC
valve closed= 45.9 `dont know
DURATION-----> 237.5 `CRANK DEG
lobe lift--> .36402 `In.
VALVE LIFT----> .58243 `In.
lobe area= 30.03 `IN * DEG

EXHAUAT
valve open = 59.8 `BBDC
* CENTERLINE---> 116.1 `BTDC
valve closed= 6.9 `ATDC
DURATION-----> 246.7 CRANK DEG
lobe lift--> .37138 IN.
VALVE LIFT----> .5942 IN.
lobe area= 31.66 IN * DEG

Heads--->Ported LT1s
-Stock valves intake. 1.94 exhaust. 1.55
-53cc combustion chambers
-3 valve angel job
-dont have the full flow# chart but they flow 265@ .600 on the intake
-1.6RR
Every thing else
-58mm TB
-Pacesetter LT and 3in "Y"
-H beam rods
-SRP/JE forged pistons (dished pistons) compresion @ 10:9:1 maybe 11:0:1
-LT4 block, 4 bolt main punched over .030
-Eagle 4340 forged crank
-Ford 30lb. injectors
-Ported LT1 Intake
-K&N Intake
-Meziere electric water pump
-March Pulley
-MSD Wires,coil,6AL box
-255 Walbro intank fuel pump
-stock push rods
-CompCam lifters
-Moroso high volume oil pump
-6 quart oil pan
-BMR K-member
-NGK TR55 plugs
-HPE Tune

trans9_5am

Sell the cam, get a nice set of heads ported (Lt1/4 or AFR), flow them, and grind a custom cam to match the heads.

Brandon

regorih inHous.

i dont have that kind of time. so how do i find out what heads would be a perfect match for the cam?

bdc95ta

if you talk to a knowledgeable head porter by the specs of the cam he should be able to determine the rpm range and what flow at the diff. lifts you need to compliment it. It can be done by the right person though.
-b

regorih inHous.

i know that the stock heads are holding me back bad , but i need to find a person that could answer my problem

ejfagala

If you have the time to get a set of heads you have time to get a cam ground. AFR heads are 12 weeks back ordered. BTW what hapened to the CC 306 in your last motor? While my motor may not be the end all to beat all it makes 414RWHP 412RWTQ and that was with a miss and a bad exhaust leak. I have AFR comp ported 195's and a CC 306. I am sure now that I have the miss and exhaust problem fixed I can get 420+ no problems and thats running a tad rich with the belt on and the motor hot on a stingy dyno, no tricks just HP

pardonme2711

dont want to high jack this guys thread, but how do u like that cam with that motor? i am working on my 383 and it will be daily driven and thats the cam i was gonna use with ported and polished stock heads and just wondering how u like kind of a small cam with a big motor.

bdc95ta

gas mileage isn't the best but the power's nice also if you have true duels it gets old fast.
-b

ejfagala

I desinged the motor around this cam and it does exactly what I thought it would. Notice I went with smaller heads and lower CR as well (195-vs-210 and 10.7:1CR) I wanted a streetable motor that got good MPG, had a broad flat Tq curve and produced 420RWHP 400 + RWTQ. The motor did all that and more (more tuning for the 420 but 414 first time out I will take it) I get 17 MPG in town no cam surge (Thanks to two great tuners Ion and Jeff) and the thing pulls like a Mack truck. I think the 306 is about the perfect all around cam for the 383, want more HP or TQ I would go solid roller.

indieaz

it takes less time to get a cam ground than it does to send off your heads to get ported. I ordered a custom grind and had it within a week.

chy20k1

fms makes some nice cams, maybee you should fix the misfire problem before you go and change anything. just my opinion.

regorih inHous.

Who can i find that will port some heads for that cam.

SS MPSTR

Port heads for a cam? Wagon in front of the horse, my friend. Sell the cam, have the heads worked/flowed, and have a cam ground for your heads and intended use of the car. Best $400 for a cam you'll ever spend.