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Old 02-15-2009, 08:51:13 PM   #1
Eric_04
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How to build cheap 400hp 350

Hey guys, I figured if anyone could help me out you guys could. So here goes.. a friend and I are planning on putting a 350 and turbo 400 in a 94 gmc jimmy. The simplest way to describe it is that it used to look like a jimmy but is now a pickup, everything behind the front seats was cut out except the floor and we enclosed the cab and put a cage in it. It basically going to be a field racer. That being said, we have a power goal of 400hp but want to do it as absolutely cheap as possible, considering what its going in. We have a complete 350 out of a truck, but I am unsure of the year, the heads, etc. It will be coming apart in the next few weeks since we just removed the drivetrain this weekend, hopefully being able to sell some or all of it from the jimmy, if anyone wants some v6 vortec stuff, or transfer case, or tranny, or front diff, etc, I have it lol. Everything is completely functional except the motor which has a knock. Basically I'm looking for the cheapest combo that we can come up with that can get us close to the 400hp mark. Thanks for the help.
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Old 02-15-2009, 09:24:22 PM   #2
cmonson
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for a rig like that, do NOT build for HP, build for torque.

For a mud bogger, torque is what gets you through the mud not HP.

If it were me, i would take that 350, make just above 9:1 compression, install a small cam, do what you can with the heads, and call it a day. I would set a goal of 350ft'lbs of tq.
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Old 02-15-2009, 10:27:12 PM   #3
Eric_04
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I guess I should state that it will not ever be a mud bogger, only 2wd now, and it will occasionally be driven on the road. It will be driven in the fields and what not only when they are dry or at least close to it, becuase driving it in the mud would be pointless.
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Old 02-16-2009, 05:06:40 AM   #4
hhott71
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A mild bracket cam
.480" lift 230º duration
decent heads
From already owned Fuelie's, Vortecs or cheap (NOT CHINESE) aluminum heads Hey Trick Flows are $1000 or less a pair.
Plus the normal bolt ons headers intake 600-700 cfm carb
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Old 02-16-2009, 08:57:36 AM   #5
warped
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Check out the roundy-round guys and their claimer motors. You might want to look at Northern Auto parts or Speedway Motors for ideas. Good luck.
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Old 02-16-2009, 09:22:15 AM   #6
Alex71RS
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Quote:
A mild bracket cam
.480" lift 230º duration
decent heads
From already owned Fuelie's, Vortecs or cheap (NOT CHINESE) aluminum heads Hey Trick Flows are $1000 or less a pair.
Plus the normal bolt ons headers intake 600-700 cfm carb

EXACTLY^^^^^^ I have a formula for a 400 horse 350 that is almost identical to that. Early 90s one-piece rear seal 350 truck shortblock, vortec heads (cut down the guides, bowl work, good springs), a Lunati Voodoo hydraulic cam (60103: 227/230 @ .050, .489/.504 lift on a 110 lobe center) Air-Gap intake and a 750 Holley. If you run the stock dished pistons, remember to mill the heads to achieve a 58cc chamber (about .040 mil-off) and use a steel shim head gasket (.015). If you decide to upgrade the pistons to flat-tops, just do the math and figure out what piston will give you a 10:1 compression ratio with the 64cc chambers. This combo will work it's best with a 10:1 compression ratio. It's probably the cheapest 400 horse motor you will ever build.
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Old 02-16-2009, 02:05:08 PM   #7
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Cmonson nailed it: Build for torque on a 4x4.

The best way to do this with a 350, and still stay on a budget, is to build a 383 stroker.

Stock 400 cranks, balancers, and flexplates are cheap and easy to find. Use your 5.7 rods and some $150 hypereutectic pistons and keep the compression below 9.5 or so. You don't need a forged crank or pistons. Use a good 'torque' cam and decent heads and go have some fun!

You should meet, or come real close to, your 400hp goal and have more torque than a 350 for about the same money. Other than some minor block clearancing, turning a 400 crank to fit a 350 doesn't cost any more than turning a 350 crank.
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Old 02-16-2009, 07:19:20 PM   #8
Led Zep
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Get a 96 -00 long block with vortec heads and roller.Will make 400 HP easily.
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Old 02-17-2009, 06:48:30 AM   #9
Led Zep
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Popular Hot Rodding did a David Vizard Build,350 made 447 HP on unported vortec heads.Used a short duration cam also, 224 duration.
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Old 02-18-2009, 01:08:45 PM   #10
woody80z28
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Quote:
Originally Posted by hhott71
A mild bracket cam
.480" lift 230 duration
decent heads
From already owned Fuelie's, Vortecs or cheap (NOT CHINESE) aluminum heads Hey Trick Flows are $1000 or less a pair.
Plus the normal bolt ons headers intake 600-700 cfm carb
I have almost that EXACT combination. Desktop dyno tells me it makes 417hp at 6000rpm and it runs great on the street.
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Old 02-19-2009, 02:49:00 PM   #11
Eric_04
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Hey thanks for all the replies everybody, I have a pretty good idea of what I have to do now. It will be a couple weeks before this thing is running since I am in the process of moving. But once I get settled it will be game on. I will post up some pics of it and trust me, you guys will laugh when you see it lol.
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Old 02-19-2009, 03:51:45 PM   #12
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Imho, a max torque cam regardless will be like this!

9.5 to 1 CR here!

260/210/268/218, 110/106, whatever lift the cam comes stock as for the engine you are putting it in.

And if you want more T, then grind it on 108/104 or 106/102!!

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