im looking to upgrade from my basic TPI setup and was leaning more toward the HSR for my specific application. i have a decent sized cam upgrade on my 383 but i cant remember the specs. my brother said it was about the biggest cam the TPI would like if that gives you any idea. also, would the HSR clear my stock 92 RS hood without having to do any cutting?

let me know if the HSR is the way to go or if i should be looking at something different.

thx

 

HSR should fit under the hood. Do what you want to do, but if you really want to upgrade save up for a LS transplant. Do what you want to do though. I was sold on HSR 383 combo for awhile till i looked at what the LS based engines are capable of in regard for potential power. Just my $.02

 

it clears no problem

a cam designed for a tpi motor would peak at 4500 rpms and start to fall off, you have to make parts match, if youre running a 383 you should have at least a 200cc head, and a cam with more duration then 230/230 at .050 lift

the HSR is a great midrange intake, its not a horribly fantastic design, and isnt going to gain you any horsepower by its design, but can easily flow enough air to support 400+ wheel horsepower.

 

im pretty sure the cam i have is over a 230/230 at .50 lift. ill try to dig up the numbers to know for sure.

however, the heads are off of an 88 iroc with a 350. as far as i know they havent had anything special done to them. am i going to run into a problem there?

 

the motor will run no question, youre just going to be losing serious power.

okay the main effect that duration has is what your peak power will be at. With that cam in a 383 youre looking at peak power at aroudn 5500 rpms which is not bad at all.

get the lift numbers on the cam. Problem with those heads is theyre not going to flow any air above .50 lift if that, and the amount of air they will be flowing is way too low for a 350, you probably dont even get 200intake/150 exhaust cfm out of them. My garbage 180cc iron eagles flow 215/175 and they wouldnt be able to flow anywhere near enough air for a 383

even just a set of something cheap like the dart iron eagle 200's or any aluminum 200cc head
with a bigger cam you could easily run a 215-220 cc head on a 383.
those heads are just garbage if youre spending less then 2000 in port work on them, and that would just be silly.

 

cam lift numbers are .3027 and .3200. if those arent what you're looking for let me know

 

Here is my setup. I am using a HSR and am very pleased with it, great power throughout all engine speeds.
The engine is a 383 cid small block chevy with forged pistons -16cc dish.
The cam is Hydraulic roller with a duration of 215 intake and 226 exhaust at .050 lift. With a gross lift of .487 intake & .480 exhaust. I am using 1.6 roller rockers for a true lift of .519 intake and .512 exhaust. The lobe angle separation is 112 degrees.
The cylinder heads are AFR 195 with 74cc combustion chambers. 2.02 intake & 1.60 exhaust valves. These are aluminum heads.
The induction is through a Holley Stealth Ram Intake, I am using 48#/hr injectors. I am running a supercharger at 8-10 pounds of boost, with alcohol/water injection.
My ignition is a MSD6.

 

LOL yes not too many people are going to argue that running an alcohol fed blower is a good way to go. I'm not sure if ti being forced induction changes things but i wouldnt put a cam that small in my 350, i get .510 lift with 1.5 rockers with 224/230 for duration in my 350.

and 92 no those arent the lift numbers yorue looking for, something should say valve lift with stock rocker ratio.
can you find the cam on summitracing? a link might make it easier for people to check out

 

oops, here we go.

216/228

 

not a bad cam for a 350 HSR...definately small for even a TPI 383. i'd upgrade especially if you go HSR

but the big deal is the stock L98 heads.... those are choking the motor. if you get a bigger cam its not gonna run any better. probly worse. getting a new set of heads on that motor with that cam will net a good gain. WIth HSR it will improve the numbers even more.

to put that in perspective, i ran 13.63 at 97 on my stock TPI L98 with full exhaust/stall/gears.
with just underdrive pullies and HSR, in good air i went 13.24 at 101.4

after adding 1.6 rockers/more tuning/drag wheels and in good air, i just went 12.95 at 103.8.

this is on a stock L98 stock heads stock cam. you can see HSR will open up your motor for sure! TPI chokes stock L98s!! not to mention a cammed 383

 

its also been balanced too... not sure how big of a factor that is either, thought i'd just throw that out there. i had been wanting to get different heads, but since i was just getting it all together and into the car, i didnt wanna pay that much for heads before it was even in and running. anyone have some ideas for some goods heads? nothing too insane or expensive, just something to give me some respective gains and unchoke the engine.

 

i've been hearing good things about patriot heads recently... just under 800 assembled for aluminum heads that flow decent.

trick flows are priced good too

 

I'm running a 350 with a 212/218 cam, 9.5 CR, stock heads and HSR. I ported the heads in the bowl area quite a bit and added undercut valves. I am very happy with the Stealth Ram so far. Looking forward to a little tuning and track time or a dyno run. Hoping for around 275 rwhp. The motor revvs quicker in the 4000+ RPM and feels stronger. I'll let you know how much when I have some numbers.

The HSR should support 400+ HP and is very streetable. At least with the cam I'm using.

If you want to keep the stock heads, there's a good thread showing one guy's results. I don't see any reason the stock heads can't flow enough for 350-400 flywheel power. I used the book "Max Performance Small Block Chevy's" by David Vizard as aporting guide. The 083 heads port nicely.

If I started from scratch I'd build a 383 with the Patriot 195 heads, 10:1 CR, a 225/230 ish cam and HSR. I'd mainly use the patriot heads cause they flow well out of the box, they're aluminum, and I spent a bunch of hours and over $500 building my stock ones. So it's basically an economic decision.

Also, the HSR setup fits under the hood of my 89 IROC no problem. I trimmed the bump in the hood's under frame, directly above the throttle body just for added clearance. The top of the manifold and the inlet hose are rubbing into the hood insulation a bit but that's about it.