L92 head dyno in GM High Tech
Originally Posted by LSX Wizard
Curious why you'd claim the Ti LS7 valves are a liability? Del West makes them, and they are certainly well known in the aftermarket world for Ti valves! Please explain.
Bret
Originally Posted by SStrokerAce
Well there have been a lot of instances where the hard tips have come off of the stockers and caused hell in the motors. I know about every shop that works with LS7 stuff regularly has gotten bit by it before.
Bret
Bret
Originally Posted by Quik
i just read that article and it is suprising that they only had a 4* spilt where as the net is saying a 10* spilt is in favor. but looking at the graph the cam they used made some good numbers on a 6.0. makes you wonder if a typical ls cam could still be used to make good power
Originally Posted by dhdenney
Not big enough.
Those were all the pixels I had to work with.
On another note... I calculate a 7.5 degree split, off of the given head flows. And those flow numbers have worse exhaust flow than what I've seen posted elsewhere. And with the headers that they are using in a dyno room, I'm sure that left a bit on the table, but how much?
Originally Posted by GIGAPUNK
Then upload some higher res scans. Or save it and zoom.
Those were all the pixels I had to work with.
Those were all the pixels I had to work with.
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Staging Lane
Joined: Aug 2006
Posts: 91
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From: under the hood
Originally Posted by SStrokerAce
Well there have been a lot of instances where the hard tips have come off of the stockers and caused hell in the motors. I know about every shop that works with LS7 stuff regularly has gotten bit by it before.
Bret
Bret
Launching!
Joined: Sep 2004
Posts: 249
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Does anyone have any idea why the L92's in the GM article made so much more power? There intake runner size is I think 260cc. From what ive heard that is way to much for a stock displacment LS2. Also the stock L92's drop the LS2's compression.
So is it just a matter of the L92's simply outflowing the LS2's heads?
So is it just a matter of the L92's simply outflowing the LS2's heads?
Originally Posted by LS2 Pontiac GTO
Does anyone have any idea why the L92's in the GM article made so much more power? There intake runner size is I think 260cc. From what ive heard that is way to much for a stock displacment LS2. Also the stock L92's drop the LS2's compression.
So is it just a matter of the L92's simply outflowing the LS2's heads?
So is it just a matter of the L92's simply outflowing the LS2's heads?
Getting the air in the cylinder is more important than how it is accomplished. If the larger port is more efficient then you can make more power than a smaller less efficient port. There is a lot of misinformation on this forum about "high velocity" ports being necessary to make good low end torque (true up to a point). These heads allow a straighter shot into the cylinder than the cathedral port heads and the extra width up high is where the air wants to flow. I do not think GM would have mass produced a head that had poor low end performance when it has to haul around 3 ton vehicles (truck motors).
Launching!
Joined: Sep 2004
Posts: 249
Likes: 0
Originally Posted by ChucksZ06
Getting the air in the cylinder is more important than how it is accomplished. If the larger port is more efficient then you can make more power than a smaller less efficient port. There is a lot of misinformation on this forum about "high velocity" ports being necessary to make good low end torque (true up to a point). These heads allow a straighter shot into the cylinder than the cathedral port heads and the extra width up high is where the air wants to flow. I do not think GM would have mass produced a head that had poor low end performance when it has to haul around 3 ton vehicles (truck motors).
FormerVendor
Joined: Jan 2002
Posts: 173
Likes: 0
From: Mpls., MN
Originally Posted by ChucksZ06
..... I do not think GM would have mass produced a head that had poor low end performance when it has to haul around 3 ton vehicles (truck motors).
so what month magazine is this article in?
who's got part #s for these heads, and who's selling them at that price? GM dealers to public? someone mentioned an adapter to fit a 90mm TB, who sells that adapter? do those heads fit LS1's? or are the valves too big for the LS1 bore?
who's got part #s for these heads, and who's selling them at that price? GM dealers to public? someone mentioned an adapter to fit a 90mm TB, who sells that adapter? do those heads fit LS1's? or are the valves too big for the LS1 bore?
Originally Posted by Irocss85
so what month magazine is this article in?
who's got part #s for these heads, and who's selling them at that price? GM dealers to public? someone mentioned an adapter to fit a 90mm TB, who sells that adapter? do those heads fit LS1's? or are the valves too big for the LS1 bore?
who's got part #s for these heads, and who's selling them at that price? GM dealers to public? someone mentioned an adapter to fit a 90mm TB, who sells that adapter? do those heads fit LS1's? or are the valves too big for the LS1 bore?
Also, any 4-bolt 90mm cable-driven TB will work, such as the Holley, UMI, or Nick Williams. Holley includes the adapter, and I believe Katech sells it outright.