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Old 09-17-2012, 09:06 AM   #1
crm318
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Duplicating the 350 HO crate

The other day, I was reading an old Car Craft magazine and they were dyno testing a 350 vortec HO (330hp). With headers and 2.25 exhaust, they made 341 hp @ 5400 and 383 tq @ 4000. I got to thinking, I have a similar set up in my truck. I have a vortec 350 (.040). The only differences are that I have the 268H Comp Cam .454/.454 218/218, a GMPP high rise intake with 3/4" spreadbore adaptor and a quadrajet with .73 jets. I also have longtube headers with 2.25 exhaust. Is it a safe bet that my engine is making similar power to the Vortec HO?
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357ci, Vortec heads,
GM Performance high rise intake,
Comp 268H .454/.454 218/218 110 LSA
Quadrajet carb, Flowtech headers, 2.25 40 series
HEI, Curve kit, TH 350, 3.07 gears
275/60/15s on 15x8 rallies
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Old 09-17-2012, 03:25 PM   #2
cdowns
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Re: Duplicating the 350 HO crate

magazine results?? they spend quite a bit of time on the dyno dialin those things in for optimum test results.. how much time did you spend on the dyno??
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Old 09-17-2012, 10:47 PM   #3
Captainfab
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Re: Duplicating the 350 HO crate

Assuming your engine is perfectly tuned, then I would say you should be close. The HO 350 uses a split pattern cam with .435 intake .460 exhaust lift and 212/222 duration. I'm not sure what the LSA is though.
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Old 09-17-2012, 10:54 PM   #4
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Re: Duplicating the 350 HO crate

Your in the neighborhood just keep in mind the street isnt a dyno room. Its amazing what an engine can do in the dyno room yet suck in the real world. Magazine tests spend lots of a time and money making engines get the most power.
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Old 09-17-2012, 10:59 PM   #5
crm318
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Re: Duplicating the 350 HO crate

I was just curious as to how close my setup would be to that of the 350 HO. They seemed comparable.
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1972 Cheyenne
Chevrolet red and white
357ci, Vortec heads,
GM Performance high rise intake,
Comp 268H .454/.454 218/218 110 LSA
Quadrajet carb, Flowtech headers, 2.25 40 series
HEI, Curve kit, TH 350, 3.07 gears
275/60/15s on 15x8 rallies
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