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Old 01-27-2007, 05:01 PM
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flow numbers..

Are these numbers preety good I was thinking on getting thier 190cc cast heads for my 355ci sbc 9.5:1,274H cam,1.6 roller rockers,rpm intake,600cfm carb I have an early chevy it's going in.I think the vlaves might be a little big but other than that the numbers look great.
ALL HEADS ARE NON-SMOG LEGAL AND NON-EGR

FLOW CHART: (Cam Lift - Intake/Exhaust)

Small Block Chevrolet (2.05" X 1.60" Valves)

190cc (As Cast)
.100 64/61
.200 128/115
.300 181/158
.400 227/190
.500 260/209
.600 277/227
.700 280/231

190cc (Polish)
.100 66/60
.200 134/115
.300 187/154
.400 234/190
.500 268/209
.600 286/227
.700 292/232

210cc (CNC)
.100 69/60
.200 139/115
.300 194/150
.400 240/190
.500 277/209
.600 295/227
.700 304/234

Big Block Chevrolet (2.25" X 1.88" Valves)

320cc (As Cast)
.100 74.3/62
.200 168/118
.300 245/160
.400 308/195
.500 340/229
.600 360/248
.700 375/265

Small Block Ford (2.05 X 1.60" Valves)

210cc (As Cast)
.100 71/61
.200 145/128
.300 200/178
.400 256/207
.500 292/218
.600 300/225
.700 305/230

210cc (Polish)
.100 75/64
.200 146/106
.300 194/162
.400 254/200
.500 284/216
.600 295/220
.700 310/235

220cc (CNC)
.100 74/58
.200 147/125
.300 205/178
.400 258/215
.500 289/227
.600 308/235
.700 320/246

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Old 01-27-2007, 06:18 PM
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Good for you.
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Old 01-27-2007, 07:23 PM
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There about $685 a set of iron heads assembled(they have aluminum too),but dont see alot of flow numbers and wondering if they are a good choice.The motor had 492 camel bumps before.Are there better heads for the price or at all I have'nt seen numbers on other newer heads.
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Old 01-28-2007, 08:05 AM
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The flow numbers look pretty good over 200 cfm on the exhaust side is pretty stout. I'd be more concerned of the quality of the heads, make sure your machinist checks them out carefully.
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Old 01-28-2007, 12:23 PM
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Quote:
Originally Posted by bonzipenguins
There about $685 a set of iron heads assembled(they have aluminum too),but dont see alot of flow numbers and wondering if they are a good choice.The motor had 492 camel bumps before.Are there better heads for the price or at all I have'nt seen numbers on other newer heads.

http://www.chevyhiperformance.com/te.../photo_14.html

http://www.eqcylinderheads.com/flow.html
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Old 01-28-2007, 12:34 PM
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What company is that? The numbers seem a little high. I have been bitten by inflated numbers in the past, namely Pro Topline. Unless you are dealing with a big name company like Dart/Brodix/AFR, someone who is tried and true, I would base my decision more on what others have experienced rather than what the published numbers are. I agree with Xntrik with the vortec recommendation. You will need a vortec specific intake, centerbolt valve covers, and self aligning rocker arms though. You can get rockers and valve covers for around $100 for both. The intake will probably be around $175, and the heads modified for .525 lift are around $350 I think from Scoggin Dickey. Those engine quest heads are another idea.

Adam

Last edited by firestone; 01-28-2007 at 12:48 PM.
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Old 01-28-2007, 12:48 PM
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Quote:
Originally Posted by firestone
What company is that? The numbers seem a little high. I have been bitten by inflated numbers in the past, namely Pro Topline. Unless you are dealing with a big name company like Dart/Brodix/AFR, someone who is tried and true, I would base my decision more on what others have experienced rather than what the published numbers are.

Adam

What company? That is pretty clear on the web sites......

It is Chevy High Performance Magazine

and

EngineQuest

I don't know what else you are expecting me to say.


NOTE: If you are basing your "hoped for" power output on flow numbers you are missing something in the translation.

AFR heads regularly make more power with "less flow" than other heads in back to back dyno pulls by independent dyno operators that aren't getting paid for doing anything.

Others' experiences are valid only for the individual specific combination that they have. Even so called identical built engines can vary 20-30 hp because of little things like..... cylinder wall finish, pushrod brand, rocker arm brand, valve spring harmonics.......

Many times I have heard someone say... "I have the identical engine set up that Joe has, BUT I have a Crane cam, Edelbrock carb, and Pertronix ignition"........

And what about the tune-up?

DUH.....

Last edited by xntrik; 01-28-2007 at 12:55 PM.
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Old 01-28-2007, 12:56 PM
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I was referring my question about which company to bonzipenguins.

Adam
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Old 01-28-2007, 01:02 PM
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Quote:
Originally Posted by firestone
I was referring my question about which company to bonzipenguins.

Adam
I apologize. Your response without direction followed mine.

Many people give undocumented, incomplete, and often irrelavent information when seeking assistance.

Thanks for pointing that out.
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Old 01-28-2007, 01:10 PM
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Not a big deal. Sorry for the miscommunication.

Adam
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Old 01-28-2007, 03:07 PM
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powerhouse it's a local machine shop and performance parts shop,I've seen em up close because they are 5miles away from my house.Excellent work on them,have bought a lot of parts from them one time I got a bad gear drive from them but it was'nt thier brand.Just wondering if these would be worth it I was thinking on the 190cc for my motor,but wondering if 2.05 intake valves are too big
http://shop.enginekits.com/osb/showi...m?Category=724
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Old 01-28-2007, 07:31 PM
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Quote:
Originally Posted by bonzipenguins
powerhouse it's a local machine shop and performance parts shop,I've seen em up close because they are 5miles away from my house.Excellent work on them,have bought a lot of parts from them one time I got a bad gear drive from them but it was'nt thier brand.Just wondering if these would be worth it I was thinking on the 190cc for my motor,but wondering if 2.05 intake valves are too big
http://shop.enginekits.com/osb/showi...m?Category=724
No. Valves cannot be too big. All 2 valve engines are undervalved.
Ports can be too big, not enough velocity for the size of the cylinder.

Actual 190 cc is the biggest I would put on any 355 cube engine unless it was an all out race engine. (190/355= 53.5 %) 190 is getting into 383 territory. The velocity below 2500 will be getting slow and response might be a little soggy and you will be giving up torque for high end power.

With the 190 as cast heads, You're going to need a tight 109* lobe center angle to get the torque and single pattern 224* duration. I suggest a 750 vacuum secondary or air valve secondary carb on an Air Gap dual plane intake.

Off the shelf, you might look at Comp's 270H, 12-211-2, 110* LSA, 224* duration single pattern, .501 lift with 1.6 rockers. 1.7 rockers would be even better.

You're going to be looking at pretty flat curve peaking about 4600 and 5900.

Last edited by xntrik; 01-28-2007 at 07:54 PM.
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Old 01-28-2007, 08:25 PM
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straight up comp cams are usually at a 106 intake centerline.Thats were I would set it up at.I never looked to much in flow numbers when I rebuilt heads,but the guy there showed me the iron 190's and said they would be far better than camel bumps or vortecs.Just was'nt sure if I really had enough motor for em'.Now if they made em' in 170cc it might be a little better for everyday driving.How do these numbers compare to other heads?I dont even know what other heads would do
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Old 01-28-2007, 09:38 PM
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Quote:
Originally Posted by bonzipenguins
straight up comp cams are usually at a 106 intake centerline.Thats were I would set it up at.I never looked to much in flow numbers when I rebuilt heads,but the guy there showed me the iron 190's and said they would be far better than camel bumps or vortecs.Just was'nt sure if I really had enough motor for em'.Now if they made em' in 170cc it might be a little better for everyday driving.How do these numbers compare to other heads?I dont even know what other heads would do
"Straight up" refers to installing a cam at the LSA (lobe separation angle).

Any cam can be timed at say 106 ILC (intake lobe centerline), and depending on what grind it is, it might be advanced, straight-up, or retarded.

For example that 270H at 106* ILC is 4 * advanced (-110-106 = +4).

http://www.chevyhiperformance.com/te.../photo_14.html
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Old 01-29-2007, 09:16 AM
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This could be an old wives tale, but I have heard that if you go too large on a valve, it can hurt flow a little because the distance between the edge of the valve and the side of the combustion chamber starts to get pretty small. I was told this when considering 2.25 valves in a set of 049 heads that I had done. I ended up going with 2.19's. Have any of you heard of this?

Adam
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