500 wheel hp na? - Page 3 - Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums

G8One2 · 10-21-2019, 01:18 PM

Duration is what changes your PTV clearance. Also how aggressive the cam is, as far as ramps rates. Milling the heads, different cam, different valves, different head gasket thicknesses all change PTV clearance. You will have the tightest clearance somewhere between 15deg BTDC and 15deg ATDC. I always measure. Not everyone does. I'd rather not test my luck, so I measured everything. Some people are good with slapping it all together because they were told it fits. Doesnt matter to me, I'd still check.

KW Baraka · 10-23-2019, 08:53 AM

Quote:

Originally Posted by G8One2

Duration is what changes your PTV clearance......You will have the tightest clearance somewhere between 15deg BTDC and 15deg ATDC.......

Agreed.

But most people....too many people....still think it's all about valve lift and milled heads.

KW

G8One2 · 10-23-2019, 10:08 AM

You can squeek out a bit more power just by taking measurements, knowing how much room you have to mill heads to get the compression where you want it. I'm an odd ball though. I don't screw around doin all this in the car. I pull the engine, put it on a stand. No one else seems to be rambunctious enough to do it that way though. They'd rather cut corners and do what they think it the easier way.

NEstyle · 10-23-2019, 10:51 PM

Quote:

Originally Posted by G8One2

You can squeek out a bit more power just by taking measurements, knowing how much room you have to mill heads to get the compression where you want it. I'm an odd ball though. I don't screw around doin all this in the car. I pull the engine, put it on a stand. No one else seems to be rambunctious enough to do it that way though. They'd rather cut corners and do what they think it the easier way.

I did it carefully, measuring everything. PTV at every degree on every valve on every cylinder, pushrod length on every cylinder, degreed the cam, etc., all with the engine in the car. My back felt it!

WHAMMO · 10-23-2019, 11:44 PM

Quote:

Originally Posted by KW Baraka

TSP 260 heads....stock heads peaked almost the same HP, but with less HP/TQ from 2000-6000 RPMs
Lingenfelter GT1-1 Cam = 229*/242*, 114* = 0* LSA, .631"/631' lift
GPI ported/radius rodded intake
90mm, V-max Throttle-body
1 7/8" long tube headers
KW

That's pretty wild that the stock heads not even ported peaked the same. But I think it's more related to the stock manifold not beeing able to go beyond 6600-6700 much.

Makes me want to just run stock heads even more.

G8One2 · 10-24-2019, 04:49 AM

Stock heads flow unbelievable well. Porting is not necessary unless your increasing bore size, or going forced induction. Back cutting the intake valve increases low lift flow quite a bit. Most I would do to the heads would be smooth out the bowl area, and milling to bump compression.

KW Baraka · 10-24-2019, 12:52 PM

Quote:

Originally Posted by WHAMMO

That's pretty wild that the stock heads not even ported peaked the same.....

Almost the same. Peaked was mid-480's....this was with the GPI intake.

You may be right, though. Depending on the intake, this set-up may ride-out another 500 RPMs....but may have sacrificed mid-range power to get there.

BTW, the TSP heads gave me a significant bump in the midrange.....up to 30hp/20tq under the curve. Makes the car a much better performer.

KW

havelegs · 10-26-2019, 10:19 AM

Quote:

Originally Posted by KW Baraka

Almost the same. Peaked was mid-480's....this was with the GPI intake.

You may be right, though. Depending on the intake, this set-up may ride-out another 500 RPMs....but may have sacrificed mid-range power to get there.

BTW, the TSP heads gave me a significant bump in the midrange.....up to 30hp/20tq under the curve. Makes the car a much better performer.

KW

Which tsp heads did you go with? I'm really considering doing that but not sure what chamber size to select.

KW Baraka · 10-31-2019, 09:50 PM

Quote:

Originally Posted by havelegs

Which tsp heads did you go with? I'm really considering doing that but not sure what chamber size to select.

PRC LS3 260cc.

KW

Bo White · 11-01-2019, 03:28 AM

I gained 15rwhp putting ported heads on my LS3 with a 218/229-.563" cam.
The build I have now is still my daily. 6000 stall th400

eLeSthree · 11-05-2019, 12:34 PM

Recipe:
Cam, bolt ons, mustang dyno. LOL! They dont always read lower...

Chris49066SS · 11-05-2019, 05:41 PM

Looks like it pulled well to 6500 rpm, they terminated the run at 6500?

lemontwist · 11-05-2019, 08:04 PM

i would forget about big numbers and bragging rights just drive it and enjoy.throw some 391's in it.
i'm dropping mine off for a tune in the morning i got a vararam intake and cat back and i'm done and faster than 99%of whats out there.

Chris49066SS · 11-05-2019, 08:27 PM

Quote:

Originally Posted by lemontwist

i would forget about big numbers and bragging rights just drive it and enjoy.throw some 391's in it.
i'm dropping mine off for a tune in the morning i got a vararam intake and cat back and i'm done and faster than 99%of whats out there.

Every time I go to the strip and every single pass I am trying to set a new personal best. Its not about a dyno number and its not even about bragging rights, its about going faster and pushing this car to new limits! To each their own though, sir

11-05-2019, 12:34 PM	#39
eLeSthree Drives: 2011 Camaro SS 6sp Join Date: Nov 2016 Location: Drivers Seat Posts: 1,904	Recipe: Cam, bolt ons, mustang dyno. LOL! They dont always read lower... Attached Images __________________ 2011 Camaro SS---SOLD TMS Dart 427 FED M311s, ESS Tuning G4 Blower, DSX Triple FP Assembly, DSX FF, FIC1300, Mcleod RXT 1200HD, Edlebrock Pro Flo XT 1158whp 1017wtq. 2010 CTS-V A6 - "Stock" SOLD 630whp 658wtq 2024 F-150 RCSB 5.0 4x4 waiting for tunes...

11-05-2019, 05:41 PM	#40
Chris49066SS Drives: 2010 SS L99 Join Date: Sep 2018 Location: Missouri Posts: 1,634	Looks like it pulled well to 6500 rpm, they terminated the run at 6500? __________________ Previous PB:11.079 @ 122.99mph.. New setup time: TBD The 11.079 pass: https://youtu.be/pz27Zq54t_E Build thread - www.camaro5.com/forums/showthread.php?t=555371

10-21-2019, 01:18 PM	#29
G8One2 Drives: 2014 Camaro 2SS Join Date: Feb 2015 Location: Metro Detroit Posts: 492	Duration is what changes your PTV clearance. Also how aggressive the cam is, as far as ramps rates. Milling the heads, different cam, different valves, different head gasket thicknesses all change PTV clearance. You will have the tightest clearance somewhere between 15deg BTDC and 15deg ATDC. I always measure. Not everyone does. I'd rather not test my luck, so I measured everything. Some people are good with slapping it all together because they were told it fits. Doesnt matter to me, I'd still check.

10-23-2019, 10:08 AM	#31
G8One2 Drives: 2014 Camaro 2SS Join Date: Feb 2015 Location: Metro Detroit Posts: 492	You can squeek out a bit more power just by taking measurements, knowing how much room you have to mill heads to get the compression where you want it. I'm an odd ball though. I don't screw around doin all this in the car. I pull the engine, put it on a stand. No one else seems to be rambunctious enough to do it that way though. They'd rather cut corners and do what they think it the easier way.

10-24-2019, 04:49 AM	#34
G8One2 Drives: 2014 Camaro 2SS Join Date: Feb 2015 Location: Metro Detroit Posts: 492	Stock heads flow unbelievable well. Porting is not necessary unless your increasing bore size, or going forced induction. Back cutting the intake valve increases low lift flow quite a bit. Most I would do to the heads would be smooth out the bowl area, and milling to bump compression.

11-01-2019, 03:28 AM	#38
Bo White Drives: 2015 Summit White 2SS 1LE Join Date: Feb 2012 Location: Vance Alabama Posts: 8,019	I gained 15rwhp putting ported heads on my LS3 with a 218/229-.563" cam. The build I have now is still my daily. 6000 stall th400

11-05-2019, 08:04 PM	#41
lemontwist Drives: 12 2SS/RS L99,11 2SS/RS LS3totaled Join Date: Jun 2019 Location: mooresville nc Posts: 1,048	i would forget about big numbers and bragging rights just drive it and enjoy.throw some 391's in it. i'm dropping mine off for a tune in the morning i got a vararam intake and cat back and i'm done and faster than 99%of whats out there.