Sanity check this heads/cam build
02-06-2007, 05:13 PM
#1
Sanity check this heads/cam build Parts are starting to arrive, so I figured I'd post this up to see if there were any caveats I haven't come across with this setup. Patrick G estimated my SCR would be 11.3 and DCR would be 8.87 pending the actual cam doctor numbers and accuracy of guessed numbers (below). Some have voiced their concern that the cam selection will be peaky.
What I have:
LS1 block, clean-up bore, balanced stock crank, Eagle 6.125" rods, ARP rod bolts, Wiseco -2cc pistons (guessing - they have valve reliefs and a small dome on top). Using a longer than stock balancer bolt due to fubar'ed threads. LS6 valley cover conversion, LS6 intake w/ removed rear crossover coolant lines, etc. SLP ported oil pump. Grotyohann headers, cat'ed y-pipe, SLP D/D cat-back, 3.73 gears
What I'm guessing on until the heads come off:
deck clearance: guessed .006" above deck
Piston head cc's
What I've received:
- TSP PRC 5.3L Stage 2.5 heads, milled to 59cc, 2.02/1.57 valves
-- PRC Platinum dual springs (145/390 spring pressure, rated at .660 lift)
- Cometic .040 gaskets
- ARP head bolts
- NGK TR6 plugs (will gap to .045)
- Water pump gaskets
- Timing cover gasket
- Timing cover seal
- Balancer bolt (yet another spare, came in package)
- Cadillac CTS-V Racing lifters
What I've ordered but not yet received:
- Center-bolt valve cover conversion hardware from an LS1Tech member (but nothing for valve cover PCV connections, tubes, etc)
- Patrick G spec'd 227/235 .639/.646 110+2 cam on LSK lobes (will be cam-doctor'ed). Requested an Autox/roadracing profile and specified I'd be shifting at 7200 to take advantage of gearing
What I plan to order:
- QTP race headers
- Magnaflow 59929 high-flow cat's
- Custom exhaust from headers to SLP D/D
- Current pushrods are not stock but unknown length. I have a Comp pushrod length checker which I hope to use to confirm the correct length. Do I need 'thicker' pushrods due to the lobe lift, etc?
What I haven't ordered and am undecided upon:
- Injectors & rocker arms (both are my original OEM '98 units)
- Timing chain: considered using a LS2 chain but I hear it's a pain to swap the chain. Maybe I'll order an adjustable timing set if the cam degreeing says I need one.
- Poly motor mounts
Some other questions:
- Will it be safe to ride the rev limiter for a few seconds to avoid shifting?
- How difficult will this be to tune? I'm using OL/SD with my current cam.
- Will there be any street manners which I may consider unruly?
- Guesstimates on what the torque/power bands will look like?
- Antyhing else I should be considering?
Thanks!
What I have:
LS1 block, clean-up bore, balanced stock crank, Eagle 6.125" rods, ARP rod bolts, Wiseco -2cc pistons (guessing - they have valve reliefs and a small dome on top). Using a longer than stock balancer bolt due to fubar'ed threads. LS6 valley cover conversion, LS6 intake w/ removed rear crossover coolant lines, etc. SLP ported oil pump. Grotyohann headers, cat'ed y-pipe, SLP D/D cat-back, 3.73 gears
What I'm guessing on until the heads come off:
deck clearance: guessed .006" above deck
Piston head cc's
What I've received:
- TSP PRC 5.3L Stage 2.5 heads, milled to 59cc, 2.02/1.57 valves
-- PRC Platinum dual springs (145/390 spring pressure, rated at .660 lift)
- Cometic .040 gaskets
- ARP head bolts
- NGK TR6 plugs (will gap to .045)
- Water pump gaskets
- Timing cover gasket
- Timing cover seal
- Balancer bolt (yet another spare, came in package)
- Cadillac CTS-V Racing lifters
What I've ordered but not yet received:
- Center-bolt valve cover conversion hardware from an LS1Tech member (but nothing for valve cover PCV connections, tubes, etc)
- Patrick G spec'd 227/235 .639/.646 110+2 cam on LSK lobes (will be cam-doctor'ed). Requested an Autox/roadracing profile and specified I'd be shifting at 7200 to take advantage of gearing
What I plan to order:
- QTP race headers
- Magnaflow 59929 high-flow cat's
- Custom exhaust from headers to SLP D/D
- Current pushrods are not stock but unknown length. I have a Comp pushrod length checker which I hope to use to confirm the correct length. Do I need 'thicker' pushrods due to the lobe lift, etc?
What I haven't ordered and am undecided upon:
- Injectors & rocker arms (both are my original OEM '98 units)
- Timing chain: considered using a LS2 chain but I hear it's a pain to swap the chain. Maybe I'll order an adjustable timing set if the cam degreeing says I need one.
- Poly motor mounts
Some other questions:
- Will it be safe to ride the rev limiter for a few seconds to avoid shifting?
- How difficult will this be to tune? I'm using OL/SD with my current cam.
- Will there be any street manners which I may consider unruly?
- Guesstimates on what the torque/power bands will look like?
- Antyhing else I should be considering?
Thanks!
02-06-2007, 10:18 PM
#3
Sounds a lot like me but with a better bottom end and a SLIGHTLY bigger cam.
Get the LS2 timing chain, its a simple replacement. Keep your stock timing gears if they aren't worn.
Stock rockers, rebuilt by Harland Sharp for $250ish so they don't fall apart.
I also recommend going to a 38# or 42# injector. I went with 30's and am wishing I went bigger now. They're enough for what I want now, but would recommend to start with bigger.
I also suggest going with the poly motor mounts, or maybe even the solids. I've debated going to Spohn's solid setup. A lot of people are saying they don't notice a huge increase in NVH much if at all.
Expect to spend some time tuning, but it should drive very well on the street. Mine drives very well for just having 3 pulls during a dyno tune session... I just wish the bottom end was looked at better (low-rpm, low-LV8 stuff).
Get the LS2 timing chain, its a simple replacement. Keep your stock timing gears if they aren't worn.
Stock rockers, rebuilt by Harland Sharp for $250ish so they don't fall apart.
I also recommend going to a 38# or 42# injector. I went with 30's and am wishing I went bigger now. They're enough for what I want now, but would recommend to start with bigger.
I also suggest going with the poly motor mounts, or maybe even the solids. I've debated going to Spohn's solid setup. A lot of people are saying they don't notice a huge increase in NVH much if at all.
Expect to spend some time tuning, but it should drive very well on the street. Mine drives very well for just having 3 pulls during a dyno tune session... I just wish the bottom end was looked at better (low-rpm, low-LV8 stuff).
02-06-2007, 10:57 PM
#4
Launching!
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Originally Posted by JimMueller
- Guesstimates on what the torque/power bands will look like?
Thanks!
Thanks!
Hammer
02-07-2007, 11:20 AM
#6
Received the cam today...
Code:
Lift Dur Open Close Area
Lobe I1
Centerline 108.3 ATDC 0.006 277.5 33.9 BTDC 63.6 ABDC 29.47
.050 Lift C/L 104.9 ATDC 0.020 254.0 22.3 BTDC 51.6 ABDC 29.32
Runout 0.00010 0.050 227.5 8.9 BTDC 38.6 ABDC 28.88
Peak Open Acc. 0.000463 0.100 199.0 5.9 BTDC 24.9 ABDC 27.83
Peak Nose Acc. -0.000325 0.150 176.0 17.9 ATDC 13.9 ABDC 26.39
Peak Close Acc. 0.000768 0.200 153.4 29.8 ATDC 3.2 ABDC 24.41
Lift @ TDC 0.0780 0.250 129.2 42.3 ATDC 8.5 BBDC 21.68
Minimum Flat 0.300 100.5 57.2 ATDC 22.3 BBDC 17.73
Follower Dia. 0.9858 0.350 60.9 77.5 ATDC 41.6 BBDC 11.25
0.37939 --- Peak Lift ---
Lift Dur Open Close Area
Lobe E1
Centerline 112.3 BTDC 0.006 284.0 77.9 BBDC 26.1 ATDC 30.83
.050 Lift C/L 116.0 BTDC 0.020 261.3 66.9 BBDC 14.4 ATDC 30.68
Runout 0.00050 0.050 235.2 53.6 BBDC 1.6 ATDC 30.20
Peak Open Acc. 0.000512 0.100 206.8 38.8 BBDC 12.0 BTDC 29.21
Peak Nose Acc. -0.000315 0.150 183.6 26.6 BBDC 23.1 BTDC 27.61
Peak Close Acc. 0.000472 0.200 160.7 14.7 BBDC 34.0 BTDC 25.57
Lift @ TDC 0.0548 0.250 136.0 1.8 BBDC 45.9 BTDC 22.72
Minimum Flat 0.300 106.8 13.3 ABDC 59.9 BTDC 18.65
Follower Dia. 0.9700 0.350 66.8 33.8 ABDC 79.5 BTDC 12.06
0.38249 --- Peak Lift ---
Duration @ .050
Intake 227.5
Exhaust 235.2
Valve Lift w/ 1.7 Rockers
Intake 0.644
Exhaust 0.650
Lobe Separation Angle 110.3
02-07-2007, 04:33 PM
#7
I punched those cam pro plus numbers into EAP, and it's telling me I have 5.6* of advance, not the 2* we requested. I was supposed to be at 11.3/8.8 compression with just 2* of advance. Should I be concerned?
Edit: Thunder said they can cam doctor a cam 5 times and get 5 slightly different sets of numbers. The rest of the numbers look pretty close, though
Edit: Thunder said they can cam doctor a cam 5 times and get 5 slightly different sets of numbers. The rest of the numbers look pretty close, though
Last edited by JimMueller; 02-07-2007 at 04:52 PM.
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02-08-2007, 12:14 AM
#13
Launching!
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Originally Posted by JimMueller
I punched those cam pro plus numbers into EAP, and it's telling me I have 5.6* of advance, not the 2* we requested. I was supposed to be at 11.3/8.8 compression with just 2* of advance. Should I be concerned?
Hammer
