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Old Sep 5, 2011 | 06:49 PM
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Default no head markings?

My car came with an extra set of heads that were on the original motor. But I can't find a 241 marking anywhere did they make some of the heads without markings? They also have dual valve springs did any heads come with dual valve springs stock? The only numbers are 0305218537038925 which is right below where the 241 would be and at the opposite end is: 3052r8493924.
What the heck are these heads?










Last edited by hartman; Sep 5, 2011 at 07:36 PM.
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Old Sep 5, 2011 | 06:57 PM
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The dual valve springs are not oem.
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Old Sep 5, 2011 | 07:13 PM
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Originally Posted by Darkman
The dual valve springs are not oem.
And theres probably no way to figure out what springs they are?
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Old Sep 5, 2011 | 07:25 PM
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Originally Posted by hartman
And theres probably no way to figure out what springs they are?
You could post a picture - some common valve springs might be recognized by someone. You would still have to have some of them tested to determine their open/closed spring pressures and other dimensions such as coil bind. If they were mine, I would likely replace them.
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Old Sep 5, 2011 | 07:36 PM
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added some pics
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Old Sep 5, 2011 | 08:35 PM
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Look for more nnumbers embossed under the valve cover area. Right under the rocker stand pedestals. Will find more identification numbers there
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Old Sep 5, 2011 | 08:38 PM
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Theres no.s in many areas of the heads. Although they look like 853 or 241s from the pics posted
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Old Sep 5, 2011 | 08:58 PM
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those look like patriot springs I have. are the ends of the heads shaved where the casting number would be?
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Old Sep 5, 2011 | 09:05 PM
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Look at the cnc marks around the valveguide....Patriot springs....
possibly early Patriot ported heads...chamber is definite 853/241 style
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Old Sep 5, 2011 | 09:10 PM
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under the valve cover inside the head all there is is a "B123" and a "22"
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Old Sep 5, 2011 | 09:14 PM
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They look ported from looking at the intake ports, they could have shaved the casting numbers off.
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Old Sep 5, 2011 | 09:23 PM
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Originally Posted by Steve01SS
They look ported from looking at the intake ports, they could have shaved the casting numbers off.
Why would someone do something so dumb? lol
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Old Sep 5, 2011 | 10:04 PM
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Becuz they try to hide its super secret identity like batman. 2:
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Old Sep 5, 2011 | 10:09 PM
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Originally Posted by NemeSS
Becuz they try to hide its super secret identity like batman. 2:
Well i paid 10k for these damn heads and it came with a free car. The least i could do was find out what they are lol. Does anyone know anywhere to send them off and have flowed and measured?
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Old Sep 6, 2011 | 07:42 PM
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Any sponsors the flow heads and measure chamber sizes?
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Old Sep 6, 2011 | 08:23 PM
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Send to Advanced Inductions or Total Engine Airflow for a freshen up
You can click on the links on the right>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
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Old Sep 6, 2011 | 10:37 PM
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Originally Posted by hartman
Why would someone do something so dumb? lol
Aftermarket companies often shave stock part numbers off when they modify parts. Prime example is rejetted stock injectors. What if they float to someone who doesn't know what they flow and use the part number to verify their origin? Same with heads, or anything else. Once its no longer a "stock" unmodified part, the number comes off.
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Old Sep 7, 2011 | 07:33 PM
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Can you tell a difference by looking between 241's and 243's?
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Old Sep 7, 2011 | 09:01 PM
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also if they were 241's or 243;s wouldn't there be a gm stamp or something like that under the valve cover?
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Old Sep 7, 2011 | 09:05 PM
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It may just be me , but the valve stems look deep in the retainer like they should have the Super-7 keepers. It just maybe the angle of the pic. Have you checked the dia. of the valve , they look larger than stock and they are ported for shore.
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