Thread: 454 supecharger help

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Hey guys,

I’ve just bought a Vortech V-7 YSI kit.
I have a 1971 Camaro with th400 and 3.73 gears.
It’s a street/strip car with a BB 454 mark IV (2 bolt main) with main girdles, TRW forged pistons, GM steel forged crank and GM 7/16 "dimple rods" with ARP bolts, and it’s all std (approx 550hp). It has a Dart heads 320cc, 1.7 roller rockers, stud girdles,850cfm mighty demon carburetor, Victor Jr intake manifold, Competition Cam solid flat tappet (advertised duration 274/280, lift .568/.578, lobe 110), Patriot headers (2 in. primary tube diameter,.3.5 in. collector diameter), 3 in. exhaust system, MSD 6AL, MSD Probillet distributor and CSI electric water pump. The compression ratio is 9.5:1.

I am looking for an honest 900 h.p. on pump gas (92/93 octane), want drivebility and reliability. I also have experience with modified engines, but NO Blower experience.

Here are my questions:

Considering the rods, pistons, crankshaft I don’t think the engine will handle more than 900hp, what do u guys think?
My supercharger setup comes with a 5 pound pulley, so how much horsepower it will make? how much boost do I need to make 900hp and how much safe boost do you guys think i can run? With more than 6 pounds do I need a bypass valve and intercooler?

Thank you

that supercharger isnt going to add 350 hp

now i dont have a vortec supercharger, but i do have a 6-71 blower on my engine, I havent dyno'd it yet we think im doing around 600hp with a 383 sbc. From what i have always heard that with a 6% under drive ( which is common for a 6-71 street blower setup ) that it will add around 100-150 hp. I couldnt imagine that vortec adding 350hp without running major boost, which I doubt you could run on pump gas. Also you think your 2bolt main will hold up to 900hp? I am a engine noob so we will see what others have to say.

oh also i get 3miles to the gallon right now.

Doubt you will get 900 horse.... To even get close you would need the intercooler and a lot more boost then 5 pounds.

Originally Posted by Uptown83

oh also i get 3miles to the gallon right now.

....Yek's.... 3 miles to the gallon??? Makes me want a small motor in the '32 I'm having built.... zzz

Yeah, I know that I will not make big power with 5 pounds on boost. The guy from supercharger store told that I need 10 pounds on boost to get 900 horses, but the thing is, Do you guys think that my engine will handle 900hp?

i doubt your engine would last long with 900hp. I think you would need to o-ring your block.

At 9.5:1 c.r., you can only put 4 lbs of boost into the motor on pump gas. Any higher boost will require special fuel.

hmmmmmmm 548 cid blown 10 mpg. 900 hp out of a stock two bolt block? NO. 700 hp yes and on the the Oring for 900 hp you do not need them the boost will have a bearing on this the 1017 felpros work good or the lsm gaskets

Originally Posted by 71SS

Hey guys,

I’ve just bought a Vortech V-7 YSI kit.
I have a 1971 Camaro with th400 and 3.73 gears.
It’s a street/strip car with a BB 454 mark IV (2 bolt main) with main girdles, TRW forged pistons, GM steel forged crank and GM 7/16 "dimple rods" with ARP bolts, and it’s all std (approx 550hp). It has a Dart heads 320cc, 1.7 roller rockers, stud girdles,850cfm mighty demon carburetor, Victor Jr intake manifold, Competition Cam solid flat tappet (advertised duration 274/280, lift .568/.578, lobe 110), Patriot headers (2 in. primary tube diameter,.3.5 in. collector diameter), 3 in. exhaust system, MSD 6AL, MSD Probillet distributor and CSI electric water pump. The compression ratio is 9.5:1.

I am looking for an honest 900 h.p. on pump gas (92/93 octane), want drivebility and reliability. I also have experience with modified engines, but NO Blower experience.

Here are my questions:

Considering the rods, pistons, crankshaft I don’t think the engine will handle more than 900hp, what do u guys think?
My supercharger setup comes with a 5 pound pulley, so how much horsepower it will make? how much boost do I need to make 900hp and how much safe boost do you guys think i can run? With more than 6 pounds do I need a bypass valve and intercooler?

Thank you

headers are to small and the ex need to be bigger the cam i would run a roller a bit bigger maybe more lsa and yes a intercooler and more boost for 900 hp 9si or more?