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Old 03-16-2012, 08:41 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 08:48 AM.
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Old 03-16-2012, 09:02 AM
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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.

Last edited by F-BIRD'88; 03-16-2012 at 09:13 AM.
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Old 03-16-2012, 09:37 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, 09:51 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, 09:53 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, 10:03 AM
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Just curious... What is the cylinder head (casting number) you are replacing?
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Old 03-16-2012, 10:11 AM
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Quote:
Originally Posted by MonteCarlo80
how do you upgrade the valvetrain?
what you need to do and to what extent depends on the cam valve lift and rpm required. The mild .454" lift cam you got now is fine stock as is.

A higher lift requires valve guide boss height shortening, for more valve lift clearance screw in studs and guide plates machining.
The newer bowtie vortecs have all these upgrades already (.530" lift ready.)
They are a much better casting and make more power too.
These bowtie vortecs were not available when I did my vortecs.

You need to look at what your power and performance goals are now and in the future when shopping for heads. Don;t just shop price, when you really want a head you can grow with.

cheapy heads are cheap for a reason. The cylinder head is key to making real horsepower.

S/R heads are just that "stock replacement" althou the casting quality is good.

they need porting to wake them up to make power. Then they do work very well.
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Old 03-16-2012, 10:17 AM
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Quote:
Originally Posted by MonteCarlo80
My friend has a holley 750 carb i can get for like $60 and yea the RPM manifold sounds like a much better idea
a good buy if its not fubared-damaged . I like to upgrade these carbs with A 750-HP carb body and some "Holley trick kit" tweeks to create a low cost powerfull high perf carb that rocks.

Lots of those RPM manifolds floating around used for sale.
Again a great deal as long as its not fubared up. Mods/ damage.
I buy and sell lots of these.

When I looked at some chinesium cylinder heads in the flesh I was not impressed.
Poor casting, and alloy, so so machining. ports need work. loose valve seats cheap valves and springs.
Some people report big headaches with them.
Some pro cylinder head shops buy them bare, cheap but completely go thru them to get them right. re machining, porting, quality hardware.

ya tend to get what you pay for.

Last edited by F-BIRD'88; 03-16-2012 at 10:29 AM.
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Old 03-16-2012, 10:42 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, 11:25 AM
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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.
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

Last edited by F-BIRD'88; 03-16-2012 at 11:30 AM.
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Old 03-16-2012, 11:30 AM
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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, 11:34 AM
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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

Last edited by F-BIRD'88; 03-16-2012 at 11:57 AM.
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Old 03-16-2012, 11:47 AM
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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, 11:52 AM
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Quote:
Originally Posted by MonteCarlo80
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?
stock replacement 1987+ SBC self aligning rockers are fine for that cam and .454" lift.
Stock GM votec motor rockers

Porting heads is a big subject. Try your vortec bowties out of the box first.
They are a very developed powerfull head, as is. This is not a head to do your first porting job on. walk before you run.

find some 305 heads to play and learn on.

Don;t be put off by the large port version either. They make huge power and work.
Not all is as it seems.

Last edited by F-BIRD'88; 03-16-2012 at 12:00 PM.
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Old 03-16-2012, 12:04 PM
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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.
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