thinking of maybe trying a custom cam to maybe fix this slug. or am i wasting my time

 

I think you are wasting your time, because there is something wrong with your car that you need to find out before wasting money on another cam that, I don't see how, would fix the problem. Your car should be making well over 450rwhp, in fact, it should be making near 475+rwhp. So...you have other issues besides a cam.

 

If you cam is on a 108 intake centerline, your valve events will look like this:
___________________________________________ 0.006 0.050 0.200
Intake Duration - ID_______________________ 283 232 152 F-14 INTAKE
Exhaust Duration - ED______________________ 287 234 150 F-14 EXHAUST
Lobe Center Angle - LCA (also known as LSA) 112 112 112
Intake Centerline - ICL____________________ 108 108 108

Intake Valve opens - IVO___________________ 33.5 8 -32 BTDC (- indicates ATDC)
Intake Valve closes - IVC__________________ 69.5 44 4 ABDC
Exhaust Valve Opens - EVO__________________ 79.5 53 11 BBDC
Exhaust Valve Closes - EVC_________________ 27.5 1 -41 ATDC (- indicates BTDC)
Exhaust Centerline - ECL___________________ 116 116 116
Overlap____________________________________ 61 9 -73 degrees


Ideally, you want to have your intake valve closing a little later and you want your overlap occuring closer to TDC. At 108 ICL, you are a little exhaust biased.

By retarding your cam 3 degrees (for a 111 ICL), you valve events will look like this:
___________________________________________ 0.006 0.050 0.200
Intake Duration - ID_______________________ 283 232 152 F-14 INTAKE
Exhaust Duration - ED______________________ 287 234 150 F-14 EXHAUST
Lobe Center Angle - LCA (also known as LSA) 112 112 112
Intake Centerline - ICL____________________ 111 111 111

Intake Valve opens - IVO___________________ 30.5 5 -35 BTDC (- indicates ATDC)
Intake Valve closes - IVC__________________ 72.5 47 7 ABDC
Exhaust Valve Opens - EVO__________________ 76.5 50 8 BBDC
Exhaust Valve Closes - EVC_________________ 30.5 4 -38 ATDC (- indicates BTDC)
Exhaust Centerline - ECL___________________ 113 113 113
Overlap____________________________________ 61 9 -73 degrees

If your cam was installed at 110 ICL (+2) then I'd say the cam is close enough to perfect and not worth messing with. You may want to look at other areas.

 

I would say forget the 400's and put a blower on and play with the 500hp #'s

Seriously,I could give you a list of stuff that could be wrong.Chasing the high dyno # get's expensive

 

I think just about everyone is confused on his low dyno #'s (well low for what he has)

 

patrick thats some good info right there. i have seen a few times on here guys go f13 to f14 and didnt make any more power or lost, maybe this would have to do with the icl you are talking about, f13 has less advance so would that bring it closer to ideal as opposed to f14? just been wondering if this could be why. anyway that info is good.

like 777 said, you may have problems that a new cam wont help with, or it could, or adjusting this cam like patrick said if its on a 112+4. i havent seen numbers with these heads you are using so i wonder if they have anything to do with it? maybe flow charachteristics arent optimal for that cam? have you called allan about this yet?

 

I don't know, but He has had a few combinations and none of them have performed as well as they should have. Have you done a compression/leakdown test?

 

Hey pdd, are you still using stock injectors?

 

That *could* be a problem, but many people have gone past his hp level with stock injectors. I would change them out if they are stock though (just to see if it helps, it can't hurt, unless you go crazy with the size). I have heard of a few people having trouble around 450rwhp with the injectors being maxed out. You will need for what you are wanting anyhow most likely. I never thought of that.

 

when i did my heads and cam i made sure i did it all, pump and injectors, dont wanna come up short. pdd who did your tuning did yu?

 

Slowhawk did it IIRC.

 

ok so im sure thats in line

 

i have 30# injectors-stock fuel pump. i havnt done a leak done test. the car and motor only have 6k miles on it. this sux. the cam is 112+4. maybe i need to drive it more i was thiking about retarding the cam 2 degrees, but i dont want to lose any midrange. the heads are 228cc, do you guys think thats too big for a 347 maybe?

 

[QUOTE=Slowhawk]I would say forget the 400's and put a blower on and play with the 500hp #'s

QUOTE]

HA, i was thinking the same thing the other day. if i cant figure this out, i just might tear the whole thing apart over the winter

 

The heads are your problem!!! Sell them to me cheap or I'll even trade you for a set of LS6 heads!

 

First, put a 300 shot of nitrous on the engine and blow it up. Then rebuild it with a forged bottom end.

Then try the MS3.

Or, just do the MS3, and if it's still acting up, see first part of post.

Seriously, pdd, did your car act up before adding the mods last fall? If not, start with that stuff. If so, repeat step one.