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Old 03-16-2012, 09:41 AM
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Which Heads For SBC 350?

I want to buy a set of cylinder heads for my 350 in my 1980 monte carlo, but im not sure which ones my engine setup can support and which ones are the best bang for my buck. Im looking to spend around $300 per head.

So here's my setup

- SBC 350 - block # 3970010
- Comp Cams Camshaft - High Energy/Marine™, 268H 12-210-2
- Comp Cams High Energy™ Hydraulic Lifters 812-16
- Edelbrock Performer Intake Manifold
- Edelbrock 600 cfm Performer Carb
- Heddman Hedders - standard duty uncoated headers

So i was looking at :

- World Products 042660 - World Products S/R Torquer Cylinder Heads
- GM Performance 12558060 - GM Performance Vortec Cylinder Heads
- Racing Head Service (RHS) 12402 - RHS Pro Torker Small Block Chevy Cylinder Heads

any and all advice/ parts to look into would be greatly appreciated

Many Thanks

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Last edited by MonteCarlo80; 03-16-2012 at 09:48 AM.
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Old 03-16-2012, 10:37 AM
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Quote:
Originally Posted by MonteCarlo80
Im looking to spend around $300 per head.
You may want to look into some chinese heads as well. Vortec runners will not work with your intake.
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Old 03-16-2012, 10:51 AM
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My friend has a holley 750 carb i can get for like $60 and yea the RPM manifold sounds like a much better idea
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Old 03-16-2012, 10:53 AM
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Quote:
Originally Posted by F-BIRD'88
http://www.summitracing.com/parts/SUM-162111/

This is a assume entry level high performance cylinder head.
Its is Summits Branded version of the Brodix IK200 (ya save $100)
You get Brodix performance quality alloy and manufacturing.

Big out of the box gain.. tons of room to grow when you want to step up the power program, later.

The vortecs are great. They require a new vortec intake manifold. Get the RPM manifold if you decide to go that route.
They also require valvetrain upgrades if you want to get beyond the valve lift you got now.
The new Assembled GM Bowtie Vortec's are hot too. and true hi perf ready.

If I wer you and ready to make the jump to a good cylinder head I would sell off the lowly performer manifold and 600carb and upgrade to a RPM style intake and 750cfm carb. The cam you got is fine for now.

Someone will buy that intake and carb to help finance the upgrade.

Summit can and will ship right to your door if you want.

how do you upgrade the valvetrain?
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Old 03-16-2012, 11:42 AM
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i havent checked the casting numbers yet, and yup the 750 is in good shape. So if i got the rpm intake and bow tie vortec heads i wouldnt need to upgrade anything else right now? and im looking for the 400 hp mark.
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Old 03-16-2012, 12:30 PM
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Quote:
Originally Posted by MonteCarlo80
i havent checked the casting numbers yet, and yup the 750 is in good shape. So if i got the rpm intake and bow tie vortec heads i wouldnt need to upgrade anything else right now? and im looking for the 400 hp mark.
your cam won't get you to the 400hp mark. You can get over the 400ftlb mark though. If you're going for th ebowtie heads then you better get some lift in there, .550"+ lift. If you want it streetfriendly you're looking at 1.6 rockers and a good hydraulic roller cam with good lifters.

BTW your budget just went from $600 to $2000...
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Old 03-16-2012, 12:47 PM
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Quote:
Originally Posted by F-BIRD'88
believe you will be very close to 400hp. If it is short it won't be by much at all.
The cam is just a tad small for that. not by much I;d try it as is first.
especially if you are using a stock converter and mild gears in your monte.
(you need the torque of a mild 268H cam for that)
But the bowtie vortec heads are very very powerfull reguardless.
This is probabily the most powerfull 23 ° cast iron SBC head on the market now.

The assembled versions is bolt on ready for your cam and most hyd and hyd roller and some solid flat tappet street cams up to .530" net lift. The newest largest 225CC port version are reported to absolutly rock.
The large 225cc port works. GM engineers know what they are doing.

Your motor has flat tops or dished pistons? you need 10:1 cr.
A dished piston will come up short on power and torque (low cr)

You'd want a 4.10 and a 3000+3500 stall for that monte to rule the streets

The bowtie heads require a vortec intake and self aligning rockers as they do n ot come assembled with guide plates. Or you can add guide plates and use standard rockers.

The pn is 25534446 large port newest revised version assembled.
( there is a ton of room to grow with this head.) makes big big power.

The smaller 185cc port head is PN25534421
This head is a big step up from a stock 062-906 L-31 vortec head.
Its got all the goodies and makes more power out of the box.
the casting is much better.
It flat out rocks when ported a bit.

pick one

are the self aligning rocker arms expensive?/ hard to install? im looking at the smaller 185cc port head, how to do you port it? machine shop? sorry for all the questions, still learning as im going. oh and the performer rpm intake, is that a vortec style intake?
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Old 03-16-2012, 01:04 PM
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Quote:
Originally Posted by F-BIRD'88
The new Assembled GM Bowtie Vortec's are hot too. and true hi perf ready.
I've seen you refer to these heads before, but with no info attached. Could you provide part numbers, etc. so that all the rest of us could take a look?
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Old 03-16-2012, 05:06 PM
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Quote:
Originally Posted by F-BIRD'88
a quick 1/4 mile drag test (MPH from the time slip) will tell the tale on how much horsepower you have right now with what you go there.
From that you can guestimate the effect of the new heads better.

A wounded motor will not make power. reguardles of what head is on it.

Have you ever been to TMP?

for 400hp w vortec heads you will need $6000 if you do it when way AP72 does stuff. ( Hyd roller s w .550" lift, you really know how to spend his money)

I do it on low buck basic flat top piston vortec 350's w just .450" valve lift hyd cam. and low low dollars near stock , low cost valvetrain. Ha ha
ya just have to know how to skin that (cheapy) cat.

The lowly 268H cam will get you very close. try it first. its not ideal you can upgrade it later.

http://s185.photobucket.com/albums/x...-bird88vid.mp4

do a search on this forum for DENCOUCH. for the dirty details
Its not the power that requires the cam, its making it streetable and taking advantage of the heads. If you're not going over .500" lift there's no advantage in running more port. A bowtie head should get a bowtie cam. Also the added lift with les duration will really make it a street performer rather than a cheap dyno queen. Doing it right does cost more but the bennefits are real. To be honest if it were mine id run chinese heads and a hyd roller cam over bowties and a flat cam. The vortec bowties are nice but there's only so much money.
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Old 03-16-2012, 11:30 PM
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Quote:
Originally Posted by F-BIRD'88
Here is what Brezinski has to say about the new Bowtie Vortec heads.
http://www.castheads.com/factory_che...tec_bowtie.php

The next vortec head I buy will be one of these.

so after some research im gonna save for the assembled bow tie vortec heads, but which ones would you recomend? the 225 or the 180 they are both around the same price assembled. Ive read that the smaller port was getting more hp gains. Oh and any product numbers on self aligning rockers? ive found a few different brands, but wanna know the best match. Oh and screw that $600 budget lol im just gonna wait a bit longer and get good parts
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Old 03-18-2012, 09:29 AM
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Quote:
Originally Posted by F-BIRD'88
GM self aligning rockers (fine for that cam lift)
GM pn 12495490

The tests comparing the 185 port to the larger port probabily was the first version 215cc port head. These large port bowtie heads are now revised to 225cc.

ya its big but they make power. All the stuff I have seem on these big revised versions shows they make big power.

The 185cc head has a slight advantage at low rpm with mild cams.

You need to decide where you want to take this.
With larger cams etc the newest larger port versions make the most power.

if you will never build a motr more radical than the one you got now,
the small port may be best.

if you ever want to build a more radical more powerfull motor ( bigger cam etcc etc) than what you got, in the future, then invest in the larger 225cc port heads, now.

if you don;t want to have to use the self aligning rockers and a vortec specific intake manifold, then buy the BrodixIK200/Summit aluminum heads.

Either path gets you into a powerfull quality cylinder head, substancial power increasse over stock heads or S/R replacements,,, with room to grow.

Does your motor have a flat top or a dished piston?
Getting the compression ratio correct is critical to makeing power.

Alrighty so im making a budget up, im going with the bigger 225 heads, and those rockers, also the performer RPM intake, looking around $1400. Oh and i havent taken the stock heads off yet, so im not sure about the pistons.
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Old 03-26-2012, 03:03 PM
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Quote:
Originally Posted by F-BIRD'88
The edelbrock rpm vortec manifold you want is PN7116

The cool air gap version is #7516.

I use the slightly lower cost Professional Products Crosswind vortec manifold.
(cause I'm cheap)
They both work great.
So my friend's dad who has been helping me rebuild my engine, says that if i add those bowtie heads and vortec manfiold, im gonna have to strengthen my low end, like new pistons and stuff. Any takes on this?
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Old 03-27-2012, 08:59 AM
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Hay it depennds on what u plan to do if its just a street car best way and cheap is pro comp heads thay work good and don't cost as much as reboulding stock heads? So that's what I did and I'm verry happy with them
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Old 03-27-2012, 09:15 AM
How fast is fast enough?
 
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Quote:
Originally Posted by MonteCarlo80
So my friend's dad who has been helping me rebuild my engine, says that if i add those bowtie heads and vortec manfiold, im gonna have to strengthen my low end, like new pistons and stuff. Any takes on this?
If you want to take advantage of the ports then yes you need to have your bottom end rebuilt. Those ports will be enough to support 7,000 RPM, and a stock lower end can't handle that. Additionally you're going to need a bigger cam to bennefit from the large ports, with more lift, probably a good hydraulic roller or solid roller, so there's another $800 you didn't account for...

225cc ports is a BIG head for a 350ci sbc. it's a typical size in racing but I don't think you're ready to build a race engine.

For a stock bottom end I would go with the 185cc versions, have a valve job and bowl work done on them, and pick a new cam to match. You'll have a lot more power in the low and midrange where you'll be running a stock bottom end.
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Old 03-27-2012, 10:10 AM
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Your right thay are a big head but it to pay big money for junk is dumb spend it one time and plan for a rebuild in the futur u don't need to rev it at 7000 rpm and stock coil won't go there any ways to get that kind off rpm you will need a lot more then heads all I was saying is don't spend good money after bad I run a small block and wasted a lot of money on junk I have a set of dubble bumps you can have and thay work good but bigger is allways better o and I have a rpm intake that match it so let me no?
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