L92 Casting Numbers
I have a set of the 823 castings here & they don't flow as well as the previous castings... Anyone else notice this?
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Jason
Co-Owner, Texas Speed & Performance, Ltd.
2005 Twin Turbo C6
404cid Stroker, 67mm Twins
994rwhp/902lb ft @ 22 psi (mustang dyno) www.Texas-Speed.com
Originally Posted by Jason 98 TA
I have a set of the 823 castings here & they don't flow as well as the previous castings... Anyone else notice this?
over for the past 2 months and I was going to send them out for an exhaust CNC rework.
Originally Posted by Richard@WCCH
I have no knowledge of the 823 castings. If anyone wants to send one to us I'll test it and report the results.
Richard
Richard
Originally Posted by StingrayCrazy
Richard, could you do just an exhaust CNC for me? I'm going forced induction and I'm planning on leaving the intake as cast. Also could you ask your GM buds how many different castings they are and is the 823 the finial release since Elwood just got his from SDPC last week?
Richard
Originally Posted by Richard@WCCH
Yes I could machine just the exhaust ports for you. I have some minor details to sort out with the exhaust program, but it doesn't have anything to do with the finished part. I could machine a pair of heads for $350. That includes re machining the seats as well. Our target flow for these ports will be 240cfm@.650" lift. I'll have some more info on that by early next week. It'll take about 3-5 days to work the heads through the shop.
Richard
Richard
Frank
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From: Rockfield Kentucky
OK you ask, so I asked....here is the response from the team at GM Performance Parts;
There are currently two different castings. We have a couple foundries and the tooling carries different numbers. I've been assured that the design of the ports and the water jackets are the same, but there are just casting process differences causing the differences that the consumers are seeing. Flow testing in stock unported form shows slight flow benefits to one vs. the other, however not enough to have any real impact on performance.
When the castings are CNC'd and the port is done correctly the flow numbers will not be affected even though some of the port will not be touched by the cutter.
We do not have control of which foundry we (and the consumer) get them from.
It's all good
Robin
There are currently two different castings. We have a couple foundries and the tooling carries different numbers. I've been assured that the design of the ports and the water jackets are the same, but there are just casting process differences causing the differences that the consumers are seeing. Flow testing in stock unported form shows slight flow benefits to one vs. the other, however not enough to have any real impact on performance.
When the castings are CNC'd and the port is done correctly the flow numbers will not be affected even though some of the port will not be touched by the cutter.
We do not have control of which foundry we (and the consumer) get them from.
It's all good
Robin
Originally Posted by Robin L
OK you ask, so I asked....here is the response from the team at GM Performance Parts;
It's all good
Robin
It's all good
Robin
Frank
Robin, you have a PM.
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Thank you for your prompt response Robin. Your exctly correct about the port not cleaning up 100%. My reason for bringing this up at all is to gain better awareness of possible differences to port wall locations. You mentioned that there are two castings being made, yet we have 3 different casting numbers. Can you let us know which 2 of the 3 casting numbers are being used?
Respectfully,
Richard
Respectfully,
Richard
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From: Rockfield Kentucky
Originally Posted by Richard@WCCH
Can you let us know which 2 of the 3 casting numbers are being used?
Respectfully,
Richard
Respectfully,
Richard
Richard
I agree with you on the number of castings. I have an L92 engine here with the 823 casting number. After I posted about the 2 I sent another request to GMPP noting that there are 3 numbers not 2. I will eventually have the 823's off and compare them to the 5364's that I have that are bare castings.
I'll start looking for some of the 2716's when I can. Still I don't think that it amounts to anything worth the effort.
I will advise when I hear more.
Thanks
Robin
i got my 823's today from SDPC. do all the intakes runners have "lumps". just wondering. mine have the lump like the 5364's do on the exhaust runner from the best i can tell
Thank you for your assistance with this Robin. I'm not really concerned about the performance differences in the as cast version, I feel the same as you on the minor difference in flow. Rather my main concern is will I need to make separate exhaust port programs for the different numbered heads due to casting wall thickness differences and the proximity to water jackets? I suppose I can port them and then saw each head apart and measure, but it'll cost valuable time not to mention money. Again, thank you for helping with this issue.
Both numbered head castings I have appear to have the same bubble in the intake port roof to accommodate the spring pocket.
Richard
Originally Posted by SUTTERERMAN85
i got my 823's today from SDPC. do all the intakes runners have "lumps". just wondering. mine have the lump like the 5364's do on the exhaust runner from the best i can tell
Richard
