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LPE GT21 installed and dyno numbers ls7

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Old 02-08-2018, 08:57 PM   #21
MTPZ06
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Ti del west intake
Ferrea stainless exhaust
Solid or hollow stem?
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Old 02-08-2018, 09:02 PM   #22
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Solid or hollow stem?
Sorry bout that

Hollow

LPE did a port job , decked heads .010 , guides and valves all at same time for me last year
Cam is 660/670. 236/256. 111lsa
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Old 02-08-2018, 09:11 PM   #23
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Sorry bout that

Hollow

LPE did a port job , decked heads .010 , guides and valves all at same time for me last year
Cam is 660/670. 236/256. 111lsa
Wow, and you were getting float as low as 5800 rpm?
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Old 02-08-2018, 09:16 PM   #24
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Yup
Here is the last run when they were floating (blue)and the 1st run after springs were changed (red)

I don't have a pic on the final graph but this is a pretty good representation
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Old 02-11-2018, 10:34 AM   #25
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Your right about having more in it because you took too much off the push rod length. You forgot there is a 1.8 ratio rocker in between. Your pushrods only needed to come down .033 to allow for the extra .060 on top of the valve. You now have .050 less lift than your cam card says it is and a little less duration as well. lol. No wonder your low end is better. It all makes cense now. You should get your old launch back with a lot more on top. probably a high 9 sec pass is in your future. GL
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Old 02-12-2018, 12:39 AM   #26
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Default Push rods

7.800 is factory so adding lash caps to exhaust we went with 7.750 push rods. On the exhaust. Where we first put 7.725 we realized that was too short An corrected our mistake today. Thanks for the info. Dino again tomorrow.
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Old 02-12-2018, 05:08 AM   #27
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I build one LS7 with GT21 and Ported stock heads, car made 597whp.
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Old 02-12-2018, 06:28 AM   #28
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7.800 is factory so adding lash caps to exhaust we went with 7.750 push rods. On the exhaust. Where we first put 7.725 we realized that was too short An corrected our mistake today. Thanks for the info. Dino again tomorrow.
you don't need to change push rod length when you add lash caps.check with an engine builder
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Old 02-12-2018, 09:15 AM   #29
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7.800 is factory so adding lash caps to exhaust we went with 7.750 push rods. On the exhaust. Where we first put 7.725 we realized that was too short An corrected our mistake today. Thanks for the info. Dino again tomorrow.
Did you measure or are you just guessing?
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Old 02-13-2018, 08:39 PM   #30
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Default Push rods

Definetly measured, by a ls tech, didnt want to take a chance since LPE wanted to cut the valve stems, to put lash caps on... We just adjust the push rods to the right length...Damn sure no guessing here too much too loose with this motor,,,, Was not gonna take any chances,
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Old 02-13-2018, 08:45 PM   #31
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Default 2nd DYNO!!!

Change push rod lengths and made a 2nd dyno secession solved a few issues, with push rod lengths and minor stuff.... Horsepower picked up 12 more ponys and torque picked up 30 more lbs...
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Old 02-18-2018, 01:00 PM   #32
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Change push rod lengths and made a 2nd dyno secession solved a few issues, with push rod lengths and minor stuff.... Horsepower picked up 12 more ponys and torque picked up 30 more lbs...
Nice jump. Should feel much different
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