After reading some i was thinking about going with heads from Patriot Performance but dont know if i should go stage 2 or 3 and i figured on Crower Cams but again stage 2 or 3. The cost is really no different i see here that alot of people run stage 2 heads and cams what would be the advantage or disadvantage with going with the stage 3 they flow more cfm thanks for the help


OEM PI Romeo or Windsor Castings
5 Axis CNC ported
Patriot Stainless Valves
Bronze Guides
.575" Lift Springs (Stage II)
.600" Lift Springs (Stage III)
Titanium Retainers
5 Angle Valve Job
No Exchange Required

Stage II 1020 Superflow Bench 3.552 Bore
1.78" Intake Valve
1.452" Exhaust Valve

Lift .100 .200 .300 .400 .500 .550 .600

cfm 64 116 162 192 213 217 218 cfm

cfm 52 98 135 162 182 189 193 cfm


Stage II Assy 1.78"/1.452"
$1,295.00 pair


Stage III 1020 Superflow Bench 3.552 Bore
1.84" Intake Valve
1.452" Exhaust Valve

Lift .100 .200 .300 .400 .500 .550 .600

cfm 68 121 169 203 219 223 226 cfm

cfm 53 100 138 165 186 196 201 cfm

Stage III Assy 1.84"/1.452"
$1,495.00 pair



Part No. Description Adv Duration Duration @.050 Gross Lift w/1.8

62802-2 Stage 2
Designed specifically for supercharger applications for street use.
RPM range: 1500 to 6500+ on 4.6L, 5.4L will be lower. 262 Lobe 262

276 Valve 276 216 Lobe 216

234 Valve 234 .581 / .581

62804-2 Stage 3
Designed specifically for supercharger applications for street/strip use.
RPM range: 1500 to 6500+ on 4.6L, 5.4L will be lower. 274 Lobe 274

288 Valve 288 228 Lobe 228

246 Valve 246 .612 / .612

 

5 angle job would be a bit much for street. also stage 3 cams have too high of an rpm range for any normal street motor. its really all depends what you are going to drive it for

 

the truck sees some street driving but mostly track time. its kind of my toy. i blew the motor so im getting a built short block and figured on doing the heads while im there. i also plan on changing the blower (Kenne bell or Whipple) some time after the motor is done. thanks for the help. Victor

 

no others suggestions

 

stage 2s will handle 10s and let you drive around town, can't remember if there was any proven issues with early wear out on valve springs with the stage 2s, but does'nt sound like you put many miles on it anyway.
Don's bolt had some custom cams ground that he said were between the stage 2&3s for better street strip versitility.
good luck.
Denny

 

Crower clains that stage 2 is for street use and that stage 3 is for street/strip use.

http://www.crower.com/cat/domestic/f...amshafts.shtml

 

I'm far from an expert, hopefully someone with firsthand experiance with both will chime in.
my take on past post was most of the guys thought 3s would be to much for street. might have been related to the lack of vacuum for the power brakes with the larger cams.

 

I like my stage 3 cams, JLP put them in along with his ported heads. These heads sit on top of my JDM built short block and with JDM's SCT tune, the motor is very streetable and makes great HP.

 

Johnny AC,
Did you have any problems with emissions? Just curious.
Bryan

 

hows the idle with the stage 3 cams. also are you running the stock blower, i think i might gi the stage 3 route

 

good thing is that the blower grinds dont have too horribly much overlap (LSA) so they idle good and have decent (but less) vacuum.

 

I think the Crower cams with there stg III .600 + lift are not such a good idea. They dont make a spring for a mod motor that will tolerate that kind of lift for any length of time.

Personally I think Comp did it right, they set a lift limit on there cams of .550 and then worked with the duration. At .550 lift you are at the limit of the valve train as far as longevity is concerned.

So Crower has too much lift and they don't have the ramp speed of a Comp cam. Thats 2 negatives IMHO. Another thing I like about the Comps is they come ground with +4 advance, I think these engines like that.
Dale

 

I'm interested to know this too...
I went with the JLP Stage 1 cams instead of Stage 2 for this reason. Would have liked to step it up if it would pass. I'm sure Stage 3 wouldn't pass at all but, a lot of people here aren't too concerned with that.

 

the emissions question is a good one anyone have any trouble with this. also what comp cam would you use they have 3 diff cams the first one seems like almost stock.

http://www.compcams.com/Technical/Cu...HTML/66-67.asp

 

Here in Wash state, the emissions test on a newer vehicle is pretty easy. They plug into your data link under the dash and see if you have any codes....because OBDII will diagnose itself I assume. Then they pull the gas cap and put a pressure check on your vapor system and thats it, your done. On new cars, there is no test required for the first five years and then you test every other year after that. A friend of mine had to do his '99 this year and he has a fairly heavy cam sound to his engine. He past with flying colors. Its my turn this year.

The biggest cam that Comp has in the catalog (XE-278-AH) is about equal to the Stg II Crower, it is just a hair bigger and one degree tighter on the lobe centers. Its the same cam I ran this year and is my favorite so far. It has an aggresive lift rate but the lift wont kill the valve springs or I should say it wont kill them as soon.
We have already had one broken valve spring up in this neck of the woods and it was on a Comp cam. We blamed it on the spring because it was an older Mod Max spring...one of the first performance springs to show up for the Mod motors. I think the springs that Crower and Comp have are much better now.
Dale