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Old 10-08-2013, 06:42 PM
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Looking for 350 hp out of my 350 sbc

I have a 1980-85 sbc 350 four bolt main. 186 heads, header,intake and the block is bored over.030. What else would I need to reach my goal.

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Old 10-08-2013, 07:54 PM
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It pretty easy to hit 350 with a 350.Is this an already running engine that you are wanting to upgrade,or,are those parts you have so far to start with? What kind of intake is it?
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Finley (10-08-2013)
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Old 10-08-2013, 07:57 PM
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Originally Posted by Finley View Post
I have a 1980-85 sbc 350 four bolt main. 186 heads, header,intake and the block is bored over.030. What else would I need to reach my goal.
Old heads....what's been done to them?
OK, so without any of the needed info let's make it simple using a bunch of assumptions.

.030 flat tops, (assumed)
0.025 in the hole , stock deck (assumed)
64cc chambers (assumed)

Compression will be fine at a little over 9.5:1 with iron heads.
Performer RPM intake
750 Carb
Longtube headers
Xe268 cam

Theres your 350hp 350 (assumed)
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Finley (10-08-2013)
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Old 10-08-2013, 08:01 PM
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It will be hard to get 350 with 186 heads.

What do you think of the vortecs?
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Old 10-08-2013, 08:14 PM
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It will be hard to get 350 with 186 heads.

What do you think of the vortecs?
I'm aware the heads are not exactly ideal.....in fact I would rather a set of chinesiem alum heads then old humps lol....but 350hp isn't exactly lofty.....same parts and a set of 882's with a shim gasket would likely almost get the number.

I swear I'm the only guy in the world that isn't a fan of vortec's lol.
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Old 10-08-2013, 08:22 PM
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If the heads haven't been updated with hardened seats,or,if they need very much work @ all,they won't be worth the costs.If they are in good shape,you can make 350.Vortecs or just about any aftermarket would be better tho.
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Finley (10-08-2013)
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Old 10-08-2013, 08:27 PM
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Quote:
Originally Posted by bygddy View Post
I'm aware the heads are not exactly ideal.....in fact I would rather a set of chinesiem alum heads then old humps lol....but 350hp isn't exactly lofty.....same parts and a set of 882's with a shim gasket would likely almost get the number.

I swear I'm the only guy in the world that isn't a fan of vortec's lol.
No, a lot of people realize their time passed a long way back. They're not the deal they once were. The large port bow tie vortecs are good but not the standard 062 or 906 castings. Too much hassle when heads are much cheaper now.
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Finley (10-08-2013)
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Old 10-08-2013, 08:45 PM
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I have a dual plane eldabrock intake. I haven't dont nothing to the heads yet. I just sold a set of 062 vortec heads. T didn't know what I have because my uncle is old school and like dumbs hump heads. So I Liston to him and sold the 062 heads and kept the 186 and 882 heads. My engine is broke down and I'm putting it together. All I have is the block bored and flat top pistons. Heads haven't been worked yet. I also have long tube headers and flow master ready. I was thinking 3 inch exhaust also.
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Old 10-08-2013, 09:00 PM
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Originally Posted by Finley View Post
I have a dual plane eldabrock intake. I haven't dont nothing to the heads yet. I just sold a set of 062 vortec heads. T didn't know what I have because my uncle is old school and like dumbs hump heads. So I Liston to him and sold the 062 heads and kept the 186 and 882 heads. My engine is broke down and I'm putting it together. All I have is the block bored and flat top pistons. Heads haven't been worked yet. I also have long tube headers and flow master ready. I was thinking 3 inch exhaust also.
We have lots of "old school" guys here to but they are smarter the the average bear and know that spending money on ancient heads isn't smart.

Let's start with what's the intended usage, what platform is it in? Trans? Gear?
What's your budget?
Which pistons? Not all flat tops are created equal....
What machining has been done already?
Let's get these questions answered and we can steer you in the right direction. Your HP goal isn't complicated, but there are many different ways and budgets to get there.

Dave
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Old 10-08-2013, 09:11 PM
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If your guides and seats are good the 186 heads will work, but don't waste money fixing them if they're not.
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Old 10-08-2013, 10:04 PM
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dart makes lots of good heads at fair prices. cast iron or aluminum,doesnt matter,just get something modern. Decent cam,good carb, go have some fun.make sure your heads flow 250+ CFM
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Old 10-08-2013, 10:52 PM
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I'm putting it in a 1986 cutlass salon with a 350 turbo trans with 3.73 gear in the rear end. My budget is around 1500. Don't know what kind of pistons. It came with the block I bought. My heads have to be reworked. The machinist told me he can do them for around 150. I want it to be a daily driver but have a Lil power to it too
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Old 10-08-2013, 11:46 PM
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1500 wont buy much,you will have to do a lot yourself.Build a near stock engine,assemble it yourself and get a good quality cam.surf the papers for a deal on heads,do not start the short block before you have the heads figured out

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Old 10-09-2013, 04:26 AM
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You need to determine the stack up of your parts.If you don't already have a crank & rods so you can measure the deck hgt,you can measure the pin hgt on your pistons.This is the measurement from the top of the piston to the center of wrist pin.Good pistons will measure 1.56".If you have cheaper rebuilders pistons that measure 1.54",you need to have the block decked,or,change pistons.You want to shoot for a piston to head clearance(Quench) of .040 to .045.There are several things you need to try to determine befor you start putting this together.Piston volume,head chamber volume.You can't figure your CR & choose an appropriate cam w/o knowing what you have.
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Finley (10-11-2013)
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Old 10-09-2013, 06:52 AM
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Is this a roller block??.
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