KNBlazer

Fellow members/enthusiasts, I need some input on whether this setup would benefit me... I am hoping to install it on a 383 SP15 from ATKengines located at the following link, I might just instead pick up a block at the local yard and have it machined, depending on price difference and all that

http://high-performance-engines.com/...duct_Code=SP15


the cam I think might be a good fit is the following


the heads I am thinking about using are the following....

http://www.trickflow.com/partdetail....4&autoview=sku



PN:
TFS-30400007-m64
08-306-8
SP15

KNBlazer

KNBlazer

KNBlazer

KNBlazer

Z2887

I can tell you a 11:1, 406. With those heads, a reg Comp. 274 flat tappet cam. Accel intake. In a over weight(Subs, amps ect ect) 85 IROC, ran a 11.40 on its first pass ever. Using MT Sportsman Pro tires. With regular Z rated 255/50/16 tires it would just roast em and sling you sideways going 70.

Oh, yeah. It was a 700r4 and 3.73 gears.

Are they available with 58cc chambers ? So you could go to 11:1 comp. ? If so I would do that. Pump gas would still be no problem.

KNBlazer

they don't have 58cc at least not on Summitracing, they do however have 56cc and 62cc with CARB EO, which is important here...

56cc - TFS-30300007
http://www.summitracing.com/parts/TFS-30300007/



62cc - TFS-30400007
http://www.summitracing.com/parts/TFS-30400007/

what will produce more HP, 56 or 64... 10:1 compression better than 9:1?

Z2887

10:1

KNBlazer

so the lower the CC the higher the compression? A 58cc head with a 383 would give me roughly 11.3 compression, at least according to a calculator I found, it did say it was a rough estimate +/-.. a few tenths...

KNBlazer

any ideas.. btw, I'll be running this with a hi-flow edelbrock TPI setup.. most likely SPEED...

86LG4Bird

iTrader: (1)

You'd do better with the Comp XE 230/236/112 cam than the Comp 306 you referenced. MUCH better powerband.

Atilla the Fun

Neither of those cams will pass an emissions test. Both of them have too much overlap. Tell me how much lift your heads can take, I'll spec you a couple of custom grinds you can choose between.

Saabster

iTrader: (2)

Yeah, that cam is pretty well into over-cammed territory on a street machine. Also, how will you fuel it? I think you'd have serious trouble getting that through emissions with a carb.

Anyway, before you go choosing a cam, I'd start by finding out the effective redline of the shortblock. No sense camming it for 7000 rpms when it can only turn 5500. Modelling the engine in something like Desktop Dyno will at least get you a ball park idea of what cam/head/redline combo will give the desired result.

Z2887

I ran a Lingenfelter cam in my GTA. I liked it alot for a daily driver. Kinda pricey though.
http://www.lingenfelter.com/mm5/merc...egory_Code=C30

Mine was a 219/219 .525/.525. I dont even see it listed anymore.

KNBlazer

What exactly am I looking for on a cam that is emissions friendly, the first cam in my original post, carries with it a CARB EO number, which I assumed to be sniffer approved... ... the heads I think have a max lift of .600... the LSA on that cam I think is a 112

this is the cam in my original post..

Z2887

Yeah, thats why I mentioned the Lingenfelter cams. I know mine was smog legal anyway. Ahhh, I see now. Your in Cali. Just because it dont have the number doesnt meant it wont pass the sniffer. In CA you have to actually have the sticker with the number on it though dont you ?

Z2887

Heres a Super Chevy build of a smog 383
http://www.superchevy.com/tech/0501s...tor/index.html

They used this.
"The flat-tappet hydraulic cam specs out with 216/228 duration at .050 and 272/284 advertised. Lift tops out at .454/.480 with 1.5:1 roller rockers and the cam's lobe separation angle is a smooth 112 degrees with 5 degrees advance ground into the intake lobe. Note the large difference between intake and exhaust figures. That helps a motor like this breathe to its fullest extent and makes good power doing it."

With Holley heads their power peak was only at 5400 RPM's though.

KNBlazer

I was thinking if the cam has smog friendly numbers I could just keep my Comp Cams CARB EO decal in my emissions book, and just show them that.. ... but I don't know.. I am still a lengths away from actually making the purchase... this will probably be a $5K project, as I would have to swap Converters, beef up the rear end with 3.73s... upgrade the brakes ..

Saabster

iTrader: (2)

They aren't going to care if it has a number if it fails the sniffer, it's going to fail.

My general rule for what to look for in a cam is that if it has overlap at .050" then it's probably too much overlap. A wider LSA can help you here, I'd look for something around the 112. I'd consider a LT4 Hot cam, they should be emissions legal on for the 96 model year, which is stricter than the 93 model year. Off the top of my head I think that's a 220/230 ish duration cam with .492 or .525 max lift depending on your choice rocker ratio. If a roller cam is an option, it's a very solid cam choice.

Z2887

I dont know exactly how it works there, but I guess you could. My brother has a Mustang that passed Maryland emissions test with a Comp XE274HR. In a 347 stroker with TFS heads. If you do go about it like that, I wouldnt go too big though. It would SUCK to have to tear it back down. That article says in a 383, you can go with a bigger one than a 350 and still make it pass. Which all the "smog" cams are really designed for 350's Im sure.

Z2887

In CA, you have to have the C.A.R.B. number for all the parts that arent factory installed on the car. It not like here where they just hook it up, and it either passes or fails. I'd definatley go with a roller, if its an option.

KNBlazer

it will be a roller block...

Atilla the Fun

You read that wrong. You see that box in the lower left, the shaded box? It is there to explain any footnotes that might be presented as numbers. Footnote number 15 would mean legal, but nowhere else on this spec sheet do you see a small 15 in brackets. This cam is NOT legal.

For a cam to be clean, it must not have any overlap at 0.050".

Atilla the Fun

Yes, it will pass the sniffer, even with 1.6:1 rockers. But even so, it's still not gonna make all the power you could get with a custom-spec cam.

Atilla the Fun

There is another approach. You can install the biggest custom grind that'll sniff clean, but get the sticker from another cam. They're not gonna see if the cam in the engine is the one that the sticker is for. And you don't get the sticker with any custom cam. The expensive way is to order something like a COMP HE268H10 hyd non-roller cam, for $100 or so, then you get a sticker in the box with the cam. Just don't install the HE268H10. Put it on e-bay or whatever. Now you have a sticker for a cam that's only 2 degrees of non-overlap different from the cam you really install.

KNBlazer

I already have a decal from my Crane Cam Compu Cam...

KNBlazer

ahhh... got it, went back to their website and indeed the CARB EO number is for the rockers.. looks like I will end up getting a custom grind... any recommendations?

Atilla the Fun

For a roller 350, the pn is 08-000-8, and the grind number is dependent on what you want. if you're willing to go to 10.5:1 and never use nitrous, you might like a 3016/3036-115. For 10:1 and the option of nitrous, a 3015/3037-115 will be better.
Now, for the numbers you're more familiar with. Assuming 1.5:1 rockers, the first is a 230/230 with .540/.533, while the second is a 224/236 with 537/536. They would drive very similarly.
If you are playing with a desktop dyno program, remember you have to add 2 degrees duration at 50 when going to 1.6:1 rockers. Now, if you try 1.6 rockers, the specs are 576/568 for the first, and .573/.571 for the second.
If you think you might ever try the 1.6 rockers, definitely give them a set of COMP 26918 springs. Be sure to verify all your clearances before turning the engine with the 1.6s.
Going to 10.5:1 might create an issue with NOX unless you're getting sniffered at the highest elevation sniffer in all of Cali.

Z2887

What did you end up going with, if anything ?

Dyno Don

iTrader: (7)

We have several cars here in Ca. with the Comp XFI 280 that are passing smog real clean.
It's all in the tune.
We have some with the TFS heads but I would go with the AFR 195's

KNBlazer

Haven't done anything, saving up the pennies to go with an LS3 E-rod package... kinda' hard since I'm in college...

Z2887

Cool. Good luck with it man.

rwstegne

Don,

I have a stock 1989 iroc Z 5.7 TPI except for an edelbrock intake and 24lb injectors but someone put the stock runners back on. I am in the process of installing a LT1 t56 and I think my head gasket is leaking. I have been trying to figure out to spec a 355 TPI build that puts out numbers like your car. Already purchased SLP runners and plan to port match it this xmas. Now, since I will have to replace a head gasket now I figure it is time to work on the motor. Can you help me to figure out TPI setup so I can price the build? I really would appreciate some help since all the information on the web has been confusing me for the last 2-1/2 years.