VinnyX40

ok i have a 350 block bored out .30 over with a eagle stroker kit ready to go its going to be a tpi engine so it has to have a cam that works with that im looking to make 450hp installed to the wheels.the rest of the parts include stealth ram intake,promaxx heads with 210cc intake runners 64cc combustion chambers 2.02 intake 1.60 exhaust valves,1.6 rocker arms,58mm tb, that what i have as of now don't have fuel injectors yet because i don't have cam yet oh and if possible i don't know where i can go to get a tuned computer or best chip for existing computer

Orr89RocZ

iTrader: (20)

Tpi typically refers to long tube runner type intakes. You have a stealth ram so its not really a tpi although run on tpi harness and ecm. Just wanted to clarify

Those heads should have some port work done to get near 450 whp.
400-420 is more realistic. What part number are those? I only saw 195, 215, and 225 heads.
Anyway if you have 11:1 comp or so, you can do something in the 236-240 deg range for a hyd roller with closer to .600" lift on intake.
Solid roller i would look at something in the 248-256 deg range on intake, mid lower .600's lift. Springs to match cam for both setups

Rev to 7k but really need to port that stealth ram to 1206 gasket that those heads probably have. It should easily make over 400whp, likely 420-430 if head flow is decent 270+ cfm.

VinnyX40

yes im using the tpi harness and computer the heads are promaxx-200 they come with the 1206 gasket and they flow 280+ cfm out of the box oh and sorry they have 200cc intake runners my bad compression range is 10:1 to 11.2:1

-=Z28=-

iTrader: (3)

TPIS in Chaska MN makes cams just for this set up. Has the rotating assembly been balanced? Everything should be within .25 gram. Make sure you have a good harmonic/damper. Ive seen a 383 build by a guy who didn't balance anything and the motor lasted maybe 1000 miles before it vibrated the bearings right out and blew up. Also with 11:1 compression you will have problems with running std gas. Maybe get bigger cc heads?? There is a nice static compression calculator at https://www.rbracing-rsr.com/compstaticcalc.html. Play around with it before you pull the trigger. I have a stroker as well. Running tpis zz409 cam with dart pr01 200 runners 72 cc, and am right around 9.5:1 - 9.8:1 compression. idles great and runs fine on pump gas with no worries of detonation. Ive been reading up on the c/r and am seeing 9.5:1 is about the sweet spot for std gas. You can still make plenty of hp with that. I have never dynod my motor but was told that it should be around 500 hp. Also the guys there at tpis are very helpful and extremely knowledgeable and have always been more than willing. Good Luck!

-Dan

-=Z28=-

iTrader: (3)

If any MODs/Admins read this, can we get a c/r calculator here at this site? Or do we? I couldn't see one..
Thanks!
-Dan

Orr89RocZ

iTrader: (20)

450 whp all motor will want 11:1 and it will be ok with the right cam and tune. Tpis zzx cam isnt bad and could make the numbers.

Steve Mack

iTrader: (5)

Can a Stealth Ram be ported out for 220 cc runners?And will it fit under the stock hood?Not trying to high jack the original posters thread. I am putting a 400 small block in my 87 Iroc and could use the info.Thanks.

Orr89RocZ

iTrader: (20)

Its possible to go to 1206 gasket if you have the base that was cast later in production. These bases have extra material around the ports. The older bases need material welded to the intake to allow porting

Single plane victor efi or similar would be a good alternative here if you can fit the elbow under hood.

Steve Mack

iTrader: (5)

Thanks Orr. Will the HSR fit under the stock hood?Thanks,Steve

Orr89RocZ

iTrader: (20)

Camaro hood yes but you mayyy need to trim a slight spot of the underhood bracing, about a 2" square that sits over throttle body and front corner of plenum. May rub slightly there

Steve Mack

iTrader: (5)

Thanks Orr,I appreciate the info.Looks like I'll be doing the HSR swap.Thanks,Steve

VinnyX40

i bought the rotating assembly balanced for eagle and its rated to 500hp so i cant go over that im just looking for the mid 400s and im good these car really dont need more than that its my weekend car now so would prefer it ran on pump gas

Orr89RocZ

iTrader: (20)

I think you would like something like this
Camshaft Part # 12-433-8 Grind # XR288HR-10

Comp cams 236/242 110 lsa

-=Z28=-

iTrader: (3)

Thats a pretty nice grind! That dyno sheet, the motor is at 9.25:1 C/R and makes sweet hp. If the motor had 10.5-11:1 what do you think the hp would be? I keep contenplating about my c/r but the more I read, 9.5:1 is perfect for std gas...

-=Z28=-

iTrader: (3)

You have to be careful tho on how the cam was ground with a stroker. the rods will chew them up. What ever cam you use, before you slide her in, look in the cam window/hole/front of block and rotate motor to see how far the rods come up. You are using 5.7 rods and a 3.75 throw crank right?

Orr89RocZ

iTrader: (20)

9.5 to 11:1 should give 3-5% more power

-=Z28=-

iTrader: (3)

Wow. thats 20 hp more @400 hp @5%...I know this isnt my thread. But, Orr89Rocz, what do you think the max c/r on std gas is?

Orr89RocZ

iTrader: (20)

All depends on the combination of parts and the tune. I dont think 11:1 is unreasonable. Many guys do it. If you keep motor cool and run enough cam, guys have run 12:1. LT1 guys have. Aluminum heads help here as they extract heat better than iron but if you keep water temps cool enough iron can take some compression
You got to be careful with the tune as in timing and air temps. In a na motor air temps are basically ambient or slightly hotter underhood. Proper timing curve is important especially at peak torque rpm range where volumetric efficiency and chamber pressures are at their highest.

You certainly do not want to run too much cam and run too rich to bypass cylinder pressure and keep mixture cool. This wont be good for power and is the wrong way to go about it.
Back in the day some cam companies offered cams to allow 12-14:1 comp motors to run on pump gas of the new age. When highoctane leaded gas wasnt available and everyone was forced to run the 87-93 stuff, you could buy a cam that bled off so much cylinder pressure it was able to run on pump gas. Didnt make power but it shows managing cylinder pressure with valve timing could be done and why you need to watch how much static comp you run with small cams

-=Z28=-

iTrader: (3)

Ahh I c. Thanks man. Great way to explain. Makes complete sense. This site has some knowledgeable members. Not that it is breaking news, but Honestly I have never looked at it like that. Coming from it that way. Like logic... right?

VinnyX40

yes it has a 3.75 crank and 5.7 rods

VinnyX40

it also came with flat top pistons with the valve cuts in the top and my friend says that would make the compression high but 350s came with those same type of pistons from factory and they werent very high compression engines

Orr89RocZ

iTrader: (20)

Stroke changes compression. More stroke is more compression all else being equal

General rule is a typical flat top piston will give near 11:1 on a 383 with 64cc heads. 10.3:1 on a 355 with same 64cc heads. 0 deck standard .041 gasket

-=Z28=-

iTrader: (3)

Google static compression calculator. I believe rmr or someone is pretty nice. play around with it.