I am building a street/strip 383 for my IROC. It will have a Super Ram Plenum and Runners with Edelbrock baseplate and either Trick Flow or AFR heads. This is the cam I was looking at. What do you think?
IF THE BLOCK HAS A HYD. ROLLER SET. USE PART # 08-304-8. THANK YOU

PART NUMBER 08-304-8
ENGINE CHEVY SM BLK 305-350
GRIND # CS 266H-R14
DESCRIPTION STAGE I
INT EXH
VALVE ADJUSTMENT HYD HYD0
GROSS VALVE LIFT .500 .510
DURATION AT
..006 TAPPET LIFT 266 276
VALVE TIMING OPEN CLOSE
AT .050 INT 5- 35
EXH 48 8-

THESE SPECS ARE FOR CAM INSTALLED
AT 110 INT C/L
INT EXH
DUR AT .050 210 220
LOBE LIFT .3330 .3400
LOBE SEPARATION 114

RECOMMENDED CC VALVE SPRINGS 986-16

 

too mild in my opinion for a 383. You got gear?

How about this with 1.6 rockers? http://www.compcams.com/speccard/08-417-8.txt

PART # 08-417
8
GRIND NUMBER: CS XM 270HR-12
ENGINE: CHEVY SM BLK 305-350
INTAKE EXHAUST
VALVE ADJUSTMENT HYD HYD
GROSS VALVE LIFT .495 .503
.006 TAPPET LIFT 270 276
VALVE TIMING OPEN CLOSE
AT .006 INT 25 BTDC 65 ABDC
EXH 72 BBDC 24 ATDC
THESE SPECS ARE FOR CAM INSTALLED
AT 110 INTAKE CENTER LINE
INTAKE EXHAUST
DURATION AT .050 218 224
LOBE LIFT .3300 .3350
LOBE SEPARATION 112
THIS CAM SHOULD USE SPRING # 986-16

or this one with 1.5s (especially if you have to pass smog)
http://www.compcams.com/speccard/08-305-8.txt
COMPETITION CAMS CAMSHAFT SPECIFICATION SHEET

PART # 08-305-8
GRIND NUMBER: CS 276H-R14
ENGINE: CHEVY SM BLK 305-350
INTAKE EXHAUST
VALVE ADJUSTMENT HYD HYD
GROSS VALVE LIFT .510 .510
.006 TAPPET LIFT 276 290
VALVE TIMING OPEN CLOSE
AT .050 INT 0 BTDC 40 ABDC
EXH 53 BBDC 3-ATDC
THESE SPECS ARE FOR CAM INSTALLED
AT 110 INTAKE CENTER LINE
INTAKE EXHAUST
DURATION AT .050 220 230
LOBE LIFT .3400 .3400
LOBE SEPARATION 114
THIS CAM SHOULD USE SPRING # 986-16

[This message has been edited by jcb999 (edited October 18, 2000).]

 

jcb is right, too mild. That would be about right for a 350 with your mods but is not enough for the longer stroke. You need one step more. The cam he suggested would run great especially on top end but would be relatively difficult to tune in a FI apllication due to the 110° LS. You might want to consider the "305" grind that is the next bigger brother to that "304". Run 1.6 rockers no matter what, because of the larger displacement of the motor.

------------------
"So many Mustangs, so little time..."

 

The ones he suggested are 112 and 114 duration aren't they? Thanks for the tips though.....I would love the bigger cam so long as I can stay emissions legal in NJ.

 

My bad... I read too fast, got my #s crossed, and somehow missed the second one in jcb's post, which is the same one I'm talking about!! Doh...

IMHO that would be the one for the rest of your combo.



------------------
"So many Mustangs, so little time..."

 

PR,

You could also look into the Comp Cams 07-306-8. This profile is designed for the LT1-family of engines, but can be installed in a Gen I SBC with the customary dowel pin modification.

The cam still incorporates a distributor gear (for the oil pump drive on an LT1) and has better lift duration numbers for yout long-stoke engine. The 112° LAS and longer duration will make overlap reach a point of significant idle rumble and will likely require a custom PROM in your application.

As with most of the decent grinds, this one is not certified 50-state legal. A good hot engine and cats at the sniffer station may take care of some of that, but it's a fight that many of us face annually.

Incidentally, none of the grinds mentioned in this thread to this point have a CARB/CAFE certification number. Haven't those penii in Sacamento fallen off yet?

------------------
Later,
Vader
------------------
"Make Me Bad"
Adobe Acrobat Reader 4.0

 

I'm planning on running a custom anyway. As far as emissions testing, NJ has the new dyno test which is going to make it hard for me to pass so I'm trying my best to keep it legal. If it's borderline I used to work in a shop that had a dyno and I know some other not so honest people.

 

we have had emisisons testing in CT for years. If i were you, Id go with about 1/8 tank and add 2 cans of dry gas. The alcohol burns really clean. I learned this from a friend with a F**d who registerd 0.0 HC and 0% CO with no smog equipment on the car!