Katech Torquer LS7 Cam now available
11-28-2006, 08:14 PM
#21
Originally Posted by AU N EGL
and arn't LSx intakes and heads desigend for max tq about 4400-4800 and max hp at 6100-6300 so yes you are correct that there is no reason to spin up to 6800 rpms.
11-30-2006, 01:03 AM
#25
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Another person interested in what this cam would do in a L92 / L76 stroker.
Since the L92 head was based off of the LS7. A cam designed for an LS7 that was put into a L92 or L76 stroker (402 to 418) should come close in hp/tq numbers.
Especially if the LS7 heads were stock on that dyno run -vs- a set of cnc ported L92 heads.
I'm guessing the springs & retainers you list for this upgrade would also be usable for a set of L92 heads.
I'm guessing the lift numbers are for 1.8" rocker arm's and would drop down to roughly .580" intake and .612" exhaust when using 1.7" rocker arm's for a L92 setup.
_edited for typo's and that long azz run on sentence_
Since the L92 head was based off of the LS7. A cam designed for an LS7 that was put into a L92 or L76 stroker (402 to 418) should come close in hp/tq numbers.
Especially if the LS7 heads were stock on that dyno run -vs- a set of cnc ported L92 heads.
I'm guessing the springs & retainers you list for this upgrade would also be usable for a set of L92 heads.
I'm guessing the lift numbers are for 1.8" rocker arm's and would drop down to roughly .580" intake and .612" exhaust when using 1.7" rocker arm's for a L92 setup.
_edited for typo's and that long azz run on sentence_
11-30-2006, 01:53 AM
#26
Originally Posted by Bring the Noise
Another person interested in what this cam would do in a L92 / L76 stroker.
11-30-2006, 04:47 AM
#27
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BK think about what I'm talking about.
L92 heads are based off of the LS7 head. Basicly scaled down slightly and changed up from a 12 degree valve angle a 15 degree valve angle.
People are putting that head (strait or slightly ported) onto LS2 or L92 Strokers that put the cubes inbetween the 402 to 418 area (just short of a stock LS7).
Hmmm the cubic inches are just short of a LS7 with a head that is designed from the LS7 head...
Simple logic should tell you that on a 400+ stroker built with L92 heads the LS7 based cam's would give very good results (it should be very close to how a built LS6 compares to a built LS2 with the same heads and cam). Especially when compared to the same motor running a LS1 based cam.
90% of all the LS1 based cam's don't seem to have the extra exhaust duration to match up to the L92 heads. This cam's design looks to have more then enough duration to make a set of L92 heads run good on a Stroker setup.
Oh and not to mention the fact that the L76 low profile manifold seems to flow better then a Fast 90 but a little lower then a LS7... and it's designed very very similar to the LS7 manifold (differences being its for mass mass mass production and its 1 piece molded unit).
L92 heads are based off of the LS7 head. Basicly scaled down slightly and changed up from a 12 degree valve angle a 15 degree valve angle.
People are putting that head (strait or slightly ported) onto LS2 or L92 Strokers that put the cubes inbetween the 402 to 418 area (just short of a stock LS7).
Hmmm the cubic inches are just short of a LS7 with a head that is designed from the LS7 head...
Simple logic should tell you that on a 400+ stroker built with L92 heads the LS7 based cam's would give very good results (it should be very close to how a built LS6 compares to a built LS2 with the same heads and cam). Especially when compared to the same motor running a LS1 based cam.
90% of all the LS1 based cam's don't seem to have the extra exhaust duration to match up to the L92 heads. This cam's design looks to have more then enough duration to make a set of L92 heads run good on a Stroker setup.
Oh and not to mention the fact that the L76 low profile manifold seems to flow better then a Fast 90 but a little lower then a LS7... and it's designed very very similar to the LS7 manifold (differences being its for mass mass mass production and its 1 piece molded unit).
Last edited by Bring the Noise; 11-30-2006 at 04:53 AM.
11-30-2006, 06:38 PM
#38
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Originally Posted by ATVracr
I've never seen a 402 without valve reliefs 
as far as verticle drop....... ya got me on that one. I have not seen the heads on a bore in person nor do I have access to a set... so as far as where the 2.16/2.18 etc intake valve at .650 or so lift matches to the piston .... no clue.
I wonder how close on the bore the valves get and what size reliefs are needed for this setup without compromising compression??????? to be determined..... Man people need to get on the stick.
I like these options alot more than buyin AFRs etc.
12-01-2006, 03:14 AM
#39
Originally Posted by Katech
I'm not really sure what you're asking here.
But I was wondering that given 427 cubes, LS7 heads and intake, and presumably long tube headers, if there was a particular RPM range that the LS7 curve "likes" to peak at. I was under the impression that a given runner length would do this, but I could be completely off base here...
12-01-2006, 08:42 AM
#40
Originally Posted by black_knight
The guy I was responding to was trying to equate the torque peak that LS1's tend to have due to runner length with the LS7 and speculating that the LS7 might "like" the same RPM range. Of course, since LS7's have different cubes and runners, this is silly.
But I was wondering that given 427 cubes, LS7 heads and intake, and presumably long tube headers, if there was a particular RPM range that the LS7 curve "likes" to peak at. I was under the impression that a given runner length would do this, but I could be completely off base here...
But I was wondering that given 427 cubes, LS7 heads and intake, and presumably long tube headers, if there was a particular RPM range that the LS7 curve "likes" to peak at. I was under the impression that a given runner length would do this, but I could be completely off base here...
In a recent cam test torque peak for all cams was 4400-4800rpm.