L92 heads flowing 374cfm & exh 250cfm
11-12-2006, 02:33 PM
#23
Wow, this really pumps me up. I can't wait till these heads are offered as a reworked version. I'm so ready to put my car back together and the heads are the last thing that I'm waiting on. Sure would be nice to save money and get better performance than aftermarket cathedral port heads.
Congrats on the heads and numbers.
Congrats on the heads and numbers.
11-12-2006, 05:03 PM
#30
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wow thats insane...awesome motor, looks like gm is doing something really worth while other than the LS7 after all. This L92 stuff jus got added to my wish list
11-12-2006, 08:21 PM
#32
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Whats going on with the carb intake? SDPC PM'd me saying they have them in stock right. So I give them a call and they tell me that the intake is not in stock nore they know when it will be in stock. Do any of you all know who has them?
11-12-2006, 10:57 PM
#34
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Those basically look like the dude fucked some **** up and Epoxied his class project to fix them and then unload them on someone...just my opinion.
11-13-2006, 12:58 AM
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Well thats a good thing that its only opinion because you know what they say about opinions "OPINIONS ARE LIKE *** HOLES EVERY ONE HAS ONE AND THEY STINK". Especially when they dont know what the hell they are talking about. Just my opinion!!!!!
11-13-2006, 01:20 AM
#37
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Originally Posted by Tuf-Titan
Hey I just bought a set of L92 heads from a grad student of School of Automotive Machinist (SAM). The port has been redone by using a little epoxy. The roof has better lines and bowl compared to the stock GM version. The heads came completely bare no guides nore seats. Bronze guides were put in and Im not sure on what type of material was used on the seats. Here's some info on the heads.
-Valve job= well I was told not to say. Sorry
-Backcut on the valve=34 worked the best
-1/2 Radius's on the ports.
-Valve size=int.2.150 Ext.1.600
-milled= .075 the chamber is @ 58 right now. I could go .025 more.
As for the air flow what I know right now is that the intake flows 374cfm at max lift and 250 on the exhust on a 4.030 bore. It flowed 380 with the valve all the way open on the flow bench. I feel that I can get 380cfm if I were to go with a bigger valve like a 2.200 with out a problem. I will post some pics here soon and some flow #s aswell. Ps I cant wait to put these on my motor. Im just waiting on a carb intake.
-Valve job= well I was told not to say. Sorry
-Backcut on the valve=34 worked the best
-1/2 Radius's on the ports.
-Valve size=int.2.150 Ext.1.600
-milled= .075 the chamber is @ 58 right now. I could go .025 more.
As for the air flow what I know right now is that the intake flows 374cfm at max lift and 250 on the exhust on a 4.030 bore. It flowed 380 with the valve all the way open on the flow bench. I feel that I can get 380cfm if I were to go with a bigger valve like a 2.200 with out a problem. I will post some pics here soon and some flow #s aswell. Ps I cant wait to put these on my motor. Im just waiting on a carb intake.
11-13-2006, 01:57 AM
#38
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i may be wrong but i think he told me that he made the ports smaller so the air volocity was faster thus the use of epoxy, but i could be wrong he was workin on a couple sets of heads at the time
11-13-2006, 07:58 AM
#39
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Nice heads 
I used epoxy to put some 1/2 inch radius's to have better averaged velocity, not sure what the port volume is...but anyhow the heads are far from being finished.
I used epoxy to put some 1/2 inch radius's to have better averaged velocity, not sure what the port volume is...but anyhow the heads are far from being finished.
11-13-2006, 11:13 AM
#40
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Originally Posted by Tuf-Titan
Well thats a good thing that its only opinion because you know what they say about opinions "OPINIONS ARE LIKE *** HOLES EVERY ONE HAS ONE AND THEY STINK". Especially when they dont know what the hell they are talking about. Just my opinion!!!!!
Theres alot of "learning" mistakes in those heads...Ill let the good head porters notice the valve guide area on the intake side of things...