Duplicating the 350 HO crate - The 1947 - Present Chevrolet & GMC Truck Message Board Network

crm318 · 09-17-2012, 10:06 AM

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?

cdowns · 09-17-2012, 04:25 PM

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??

**Captainfab** · 09-17-2012, 11:47 PM

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.

cableguy0 · 09-17-2012, 11:54 PM

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.

crm318 · 09-17-2012, 11:59 PM

I was just curious as to how close my setup would be to that of the 350 HO. They seemed comparable.

09-17-2012, 10:06 AM	#1
crm318 Alright Alright Alright Join Date: Mar 2004 Location: Midland, Texas Posts: 1,672	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? __________________ 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

09-17-2012, 04:25 PM	#2
cdowns Senior Member Join Date: Jan 2003 Location: daytonabeach Posts: 22,956	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?? __________________ 71c-10 350/2004r/4:11 lowered3/4 longbed/dead by hurricane MEANING OF DEATH::::: SOMEBODY ELSE GETS YOUR STUFF DONT BELIEVE EVERYTHING YOU THINK TAKE MY ADVISE;I DON'T USE IT ANYWAY

09-17-2012, 11:47 PM	#3
Captainfab 60-66 Nut Join Date: Mar 2007 Location: Coeur d'Alene, Idaho Posts: 23,246	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. __________________ Power Steering Box Adapter Plates For Sale HERE Power Brake Booster Adapter Brackets For Sale '63-'66 HERE and '67-'72 HERE and '60-'62 HERE and "60-'62 with clutch HERE Rear Disc Brake Brackets For Sale. Impala SS calipers HERE Camaro Calipers HERE D52 Calipers HERE 6 Lug HERE Hydroboost Mounting Plates HERE

09-17-2012, 11:54 PM	#4
cableguy0 Senior Member Join Date: Apr 2000 Location: Delta,Pa Posts: 14,950	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. __________________ Owner of North Point Car Care in Dundalk Md. We specialize in custom exhaust on both modern and classic vehicles. We are a full service auto shop from classics to modern vehicles. Feel free to contact me with questions. I will give a 10% discount to any board member.

09-17-2012, 11:59 PM	#5
crm318 Alright Alright Alright Join Date: Mar 2004 Location: Midland, Texas Posts: 1,672	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. __________________ 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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