ok heres the cam specs...Im sure most of you have seen it before from way back...Ive dont alot of searches and just want your input on the idea. I know it adds more lift and such but Ive read some stuff about it changing the overlap and the way the car with run..I just want to make sure Im not going to run into any problems once I do this.
Ok I had the cam installed just like it says on the card so I wont be pulling it out to do anything..I just want to R/R the 1.52 with the 1.6's
where will I gain the power? up top or middle or just all over the power band and how much is the usual?

thanks!


Cubic Inch and Engine Type 383 CID Small Block Chevrolet
Camshaft Type Hydraulic Roller
Firing Order STD SBC
Cam Bearing STD SBC
Lobe Separation 113.5
Overlap at .050” 2.2 Degrees

Camshaft Measurement Intake Exhaust
Duration at .006” 281.5 286.5
Duration at .020” 255.5 260.9
Duration at .050” 226.0 232.1
Duration at .200” 145.4 151.7
Lobe Lift .34961” .35323”
Rocker Ratio 1.52 1.52
Gross Lift .531” .537”
Lash HOT HYD HYD
Designed Lobe Centerline 110.9 ATDC 116.0 BTDC
Open at .050” 2.1 BTDC 52.1 BBDC
Close at .050” 43.9 ABDC 0.1 ATDC
Lift at Top Dead Center .0587” @ 110.9 In. Cente .0591” @ 116.0 Ex. Center

Cranking Compression 189 PSI
Vacuum At Idle 15.7 Inches
Idle RPM 850 RPM
Peak Torque RPM 4400 RPM
Peak Horsepower RPM 5500 RPM
Torque Convertor Stall 4000 RPM to 4500 RPM (Flash In High Gear At 5-10 mph)
Starting Shift Point RPM 6300 RPM
Starting RPM To Cross 6600 RPM

 

I'd do it. It will bring the cam up to around .560" lift and adds a few degrees of duration at the valve. I think you could use more cam for those cubes and heads and this is a good way to find out for sure. I don't think you'll notice a seat of the pants difference in any aspect of your car from idle on up...It may or may not be worth 5-20hp in my opinion.

 

may or may not? LOL....! god Im hoping its worth something for the trouble. Where would the extra power be?

 

I'd do it.

If you dont feel any difference, put the 1.52's on the exhaust's and leave the 1.6's on the intake and try that...some motors like that.

If you can,swap to the 1.6's and go to the track and make some passes. Then go and swap the 1.52's on the exh. and go to the track again. That way you'll KNOW if/what you picked up in power.

 

I would do it a not look back. 383 cubes and AFR 195's can benefit from a lot more camshaft than you chose. You'll make more power across the entire powerband.

I would have done a 242/248'ish cam around .600" and stepped it to a 4000 stall but that's just me. Shift would have been closer to 6400-6600. It would be not as tame as what you have for driving though. Goodluck! report back!

 

yeah I went ahead and got them. I'll be putting them on this weekend...I still need a tune bad!
Whats the point of mix matching the rockers? more intake and less exhaust? Most lifts like your describing Ive only seen on LS motors. I mean I know nothing about what Im talking about thats why I come here to see what input you guys have. I took my motor out this past weekend to fix a pan leak and will be putting it back in this weekend with the new rockers.

Yeah ive been told that I would pick ALOT thru out the entire band with the 1.6's ...thats why I want!

 

Yep,it'll make the idle a little more radical and it should pull harder in the top end.

A tune will really help also.

 

by mix matching the rockers or by just adding the 1.6's?

thats actually what Im looking for...more top end pull...my bottom end is fine cause of the stroke and the 3400 stall

 

A 226/232 duration@.050 certainly isn't a monster cam. You'll pick up roughly 2* od duration and around .030 lift. You engine can definately benefit from some more lift and duration. See my sig, I've got more lift/duration in a lil ol stock bottom LT1

 

oh yeah!...I hear ya....I was wondering why my cam guy didnt add a little more duration/lift but he told me dont worry bout it!> but Im gonna add the 1.6 anways to get all I can outta the cam....it pulls like freaking crazy on bottom end but I was want more top! 30 roll I can spin 10 foot! and thats without an optimal tune..I should pick up a good 40hp with just the tune..drivablity is ok. god I can only imagine what it will do when I hit it with a 100 gas hit!

 

my engine guy says that by adding the 1.6's ...it will change the whole way the cam will act...when it was ground for 1.52 rockers to begin with.

whats the truth behind that? and if and how will it change the way the cam acts?

I was there when he was degreeing a pro mod motor and Im thinking that when I add the 1.6's it will change the centerline and stuff. So the cam should be re-degree'd with the 1.6's...which Im not doing.....

Im just going to add the rockers and be done with it. screw it if it changes something. should and hope it will be for the good.

 

Last week I mentioned to someone that they were overthinking....

The cam doesn't act. It will be the same. It won't get sad or mad...

The added duration and lift all happens at the valve because of the added ratio. Timing events are all changing for the better with what you're doing. This is a cheap mod that should give you some good results. Nothing I would split hairs over. BOLT ONS.

 

someone told me that I will not benifit and might even hurt performance because my Eliminator's wont use that extra air flow...and it would hurt the air velocity or something like that.

The flow numbers of the Street Eliminators are as followed,
.200= 137/110
.300= 196/158
.400= 243/190
.500= 274/207
.550= 280/211

the extra lift would put them over the usuable lift of the heads.

The HSR intake is suppose to flow 275cfm's


I went on AFR's website and none of the cams they use are over 540lift on thier 383's even the 230/236 cams.

 

nevermind...I put them on anyways....cause the paper that I got with my heads say...at .600 they are 286/215 so the with handle the lift no problem.
There are plenty of people running more lift than that thru them with bigger cams make great power. SO im good to go!

guess we'll see