GM LSX-L92 Small Bore Cylinder Heads
I called pace a couple of days ago and they had no info 
07-09-2009, 07:01 PM
#42
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well pace has the part number in their system. It brings it up when you search the part number on their website, but just says call for price. Scoggin dikey doenst have it in their system yet but both pace and gmpp do have it listed. Must be getting ready to come out soon, at least we all hope.
edit: I called pace and they have no eta as this poit
edit: I called pace and they have no eta as this poit
Last edited by redsap05; 07-10-2009 at 10:48 PM.
08-18-2009, 12:44 PM
#43
Any News on these heads? ANY WHERE we can buy them? I know RLD Performance is making them. Is anyone else BESIDES MAST cause they charge an arm and a leg for everything selling these heads???
http://www.rldperformance.com/catalog.htm
http://www.rldperformance.com/catalog.htm
11-28-2009, 12:42 PM
#47
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Yea I agree for the bump, I am doing heads/cam in the spring and was going to do a 6.0 swap to use the L92 heads. If these are out for a good price then why go through the extra work. Hope someone comes up with some info!!!
12-16-2009, 05:04 PM
#51
I would love to see some numbers on these, price wise and price wise. I got pretty excited about the new mast heads too. They look to big also, but their engineer said it does pretty good volicity wise. They seem pretty proud, though, of them to be in the mid $2000 range or so. I do see having to use a more agressive exhaust duration of a cam. Still kinda leaves the 5.3s out in the cold though still, unless you overbore the motor to a 5.7, not sure about putting turbos on that type of combo that far out. Though I see it making alot of power without having a ton of boost having to blow through the intake ports.
01-13-2010, 04:19 PM
#53
There was a story in the March 2010 issue of GM High-tech performance mag about the new small bore Mast heads. Race Krafters did the install on one of their daily drivers. I was curious, so I called them up for his personal take on these heads. He said they look good on paper and all his wide open throttle tuning was really easy. Part throttle wasnt so fun. A 346 motor in his opinion needs a really big cam and motor needs to really spin to the moon to really make them work. His car was an automatic too, a stick car with gears would be a plus since they are really lazy with hardly any velocity in the lower range. I was really disappointed, but with these heads being 1200 dollars bare, (almost 3600 with valves and springs) I guess I shouldnt be to surprised. Now he did say if you do build a 383 they should perform better. I know there is a pretty big debate on here between square port or Cathedrawl port, and this definately doesnt put anything to rest conclusively. I am still waiting for the Gm version to come out, but I think unless they come close in price to other heads, things might be kinda bleak and not much of an advantage. What are some of you guys thoughts.
01-13-2010, 04:24 PM
#54
Oh, I am still glad Mast still came out with them, maybe some of the other companies will invest in the idea too maybe. They do seem to make a quality product, and maybe they are supposed to be more of a higher end head, just way outta what I am building.
01-13-2010, 11:48 PM
#56
I also asked that question too. He said you would want to have a custom turbo with a smaller hot side and a bigger cold side due to the intake and exhaust ports being so offset in their sizes. It is also one of the reasons when you select a cam for the 2 different heads the square ports really require so much more duration on the exhaust side. I think for the most part the point I am more or less trying to make and he made to me is that for the cost of these heads the return on total power by themselves and driveability might be kinda not what one might expect. Soggy driveability was how he described it, all out race head was ok, maybe if you stroke the motor might have better results as say a 383 versus a 346.
01-16-2010, 09:19 PM
#58
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I also asked that question too. He said you would want to have a custom turbo with a smaller hot side and a bigger cold side due to the intake and exhaust ports being so offset in their sizes. It is also one of the reasons when you select a cam for the 2 different heads the square ports really require so much more duration on the exhaust side. I think for the most part the point I am more or less trying to make and he made to me is that for the cost of these heads the return on total power by themselves and driveability might be kinda not what one might expect. Soggy driveability was how he described it, all out race head was ok, maybe if you stroke the motor might have better results as say a 383 versus a 346.
02-07-2010, 07:21 PM
#59
It wasnt Mast that said that it was the Owner Or Racecrafters. He went through all the work of putting them on his street driven Camaro. Said it would totally be good on a very built motor or something signifantly bigger in size.
02-07-2010, 10:20 PM
#60
