☺ ☺ New Release - Medium Geometry L92 heads☺ ☺

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Feb 24, 2007 | 01:31 PM

0C_Williams@RPM

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From: Valencia Ca

☺ ☺ New Release - Medium Geometry L92 heads☺ ☺

Quick specs -

Intake flow = 360 CFM
Exhaust flow (pipe) = 270 CFM
Chamber Volume = 66 cc

Price - awaiting valve pricing so final pricing will be released on Monday or Tuesday - but these are way, way below any after market heads presently available!

Enjoy

Intake Ports and Flow Chart

Exhaust Ports and Flow Chart

Combustion Chamber 66 cc

Feb 25, 2007 | 02:15 AM

tjwong

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From: Portland Oregon

What was the original chamber volume and how much did you have to mill to get to 66cc?

Feb 26, 2007 | 10:09 AM

0C_Williams@RPM

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From: Valencia Ca

Quote:

Originally Posted by tjwong

What was the original chamber volume and how much did you have to mill to get to 66cc?

.045 milled...and that was after the CNC reshaping of the stock chamber - stock chamber is ~70cc

charlie

Feb 26, 2007 | 10:41 AM

5 Liter Eater

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From: Houston TX

St. Jude Donor '11

Dumb question but @ 66cc's these would yield stock compression #'s on an LS2 right?

Feb 26, 2007 | 10:49 AM

Phate

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From: Northridge CA

What is the intake runner volume?

Feb 26, 2007 | 10:57 AM

0C_Williams@RPM

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From: Valencia Ca

Quote:

Originally Posted by Scott 98Z M6

What is the intake runner volume?

Stock L92 ports are ~ 260cc - these are ~265.

And then the next question might be about runner volume vs velocity vs power. The short answer is that volumetric efficiencies are the critical factor and runner volume is a factor, not the key.

charlie

Feb 26, 2007 | 11:24 AM

Stang's Bane

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From: New Richmond, Wi

Quote:

Originally Posted by C_Williams@RPM

Very nice pickup flow vs increase of runner size. When are you expecting HP numbers??

Valve sizes?? Stock??

Mar 5, 2007 | 08:46 PM

0C_Williams@RPM

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From: Valencia Ca

Quote:

Originally Posted by Stang's Bane

Very nice pickup flow vs increase of runner size. When are you expecting HP numbers??

Valve sizes?? Stock??

stock valve sizes....

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Mar 6, 2007 | 04:14 AM

Invisiguard

Burning Brakes

Joined: Mar 2006

Posts: 906

Likes: 1

From: SF Bay CA

wow, what motor/mods is that with!

Mar 6, 2007 | 07:32 AM

#10

HITMAN99

Drifting

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From: Annandale VA

If that dyno chart is from a 6L LS2 motor, I am deeply impressed. Looks like close to 375 TQ at 2500 RPMs, only a slight dip at 4K, nice flat curve.

Ooops, I see from another thread that this is a 417 motor with a 230+ cam. Now it starts to make more sense.

Last edited by HITMAN99; Apr 4, 2007 at 08:14 AM.

Mar 6, 2007 | 12:23 PM

#11

andreas g.

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From: laguna niguel ca

Quote:

Originally Posted by Invisiguard

wow, what motor/mods is that with!

It's a Z51 6sp, With magnaflows, Kooks 13/4 headers, 160 stat, the cam is mild at 232/234/595/598/112LSA's,because it's a daily driver. I had them install a direct fit large radiator, and the Texelerla X-grip clutch. that's it plus the new motor. I'm going up wednesday to pick it up and drive it home. It should be a great running car.

Last edited by andreas g.; Mar 6, 2007 at 05:01 PM.

Mar 6, 2007 | 12:32 PM

#12

Lexicon

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From: Kennewick WA

Can you make those heads w/o the reduced chamber cc?

I am looking to lower the effective compression ratio so that I can run more boost.

Also, will there be options for the valves and rockers?

I would like to get a complete setup ready to bolt on.

Apr 2, 2007 | 07:47 PM

#13

aTX427

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Posts: n/a

Charlie, Are these heads hand ported? If so, how repeatable are these flow numbers? What is the exhaust numbers without the pipe?

Apr 3, 2007 | 12:33 AM

#14

0C_Williams@RPM

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From: Valencia Ca

Quote:

Originally Posted by john_sblendorio

Charlie, Are these heads hand ported? If so, how repeatable are these flow numbers? What is the exhaust numbers without the pipe?

John, these are CNC ported and repeat within a few CFM.

Charlie

Apr 3, 2007 | 10:35 AM

#15

pennys58

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From: Friendswood Texas

St. Jude Donor '06-'07-'08

Any word on the price yet?

Apr 3, 2007 | 11:06 AM

#16

0C_Williams@RPM

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From: Valencia Ca

Quote:

Originally Posted by pennys58

Any word on the price yet?

$1595 -

Charlie

Apr 3, 2007 | 11:08 AM

#17

aTX427

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CNC - very nice. Were those numbers with a pipe? If so, can you provide the exhaust flow numbers without the pipe?

Apr 4, 2007 | 10:47 AM

#18

0C_Williams@RPM

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From: Valencia Ca

Quote:

Originally Posted by john_sblendorio

CNC - very nice. Were those numbers with a pipe? If so, can you provide the exhaust flow numbers without the pipe?

John,

Without a pipe - high 240's.

Charlie

Apr 4, 2007 | 10:54 AM

#19

0C_Williams@RPM

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From: Valencia Ca

Quote:

Originally Posted by Lexicon

71 cc's is as large as I've gone. Could go more. How much boost are you going to run?

Valve options only limited to budget. Stock and SS are the base choice, with additional options of Inconel, Titanium and hollow stem SS.

Rockers are limited to stock - although you can have Harland Sharp upgrade the trunnions.

thanks,

Charlie

Apr 4, 2007 | 11:22 AM

#20

fright88

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From: Littleton CO

Ok so I know nothing about heads. Would these heads be good to run with a mild cam on an otherwise stock motor? What kind of numbers would I expect. Also does the price include a core charge or anything? I am planning on doing possibly heads/cam pulleys headers cai and intake and leaving the car alone after that. Thanks for any info

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