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Thread: Pushrod Length?
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02-27-2007, 07:58 AM #1
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Burgandy- 2000 Camaro Z28
Pushrod Length?
Just got a comp cam and valve springs for my 2000 Z28, Advertised Duration 265/ 271, Lift .558/ .563. Wondering if any one has installed a similar cam or if anyone knows if i will need different then stock length pushrods.
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02-27-2007, 10:32 AM #2
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black, 05 Roush- black, 99 T/A WS.6
that is the biggest duration for an LS1 cam I have seen so far.....as far as your question.....well I honestly dont know. Sorry I just wanted express my amazement on the size of the cam, its huge.
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02-27-2007, 03:23 PM #3
That's because those are the advertised duration numbers. You may be thinking of the aftermarket duration numbers @.050" lift. Advertised duration is understood to measure the duration @.006" lift. So, the duration numbers @.050" are smaller numerically.
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02-27-2007, 03:28 PM #4
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Mystic Teal- 99 Trans Am & 01 CBR 929
actually its relatively small... advertised duration is different.
for example this high lift comp cam...
Cam Style: Hydraulic roller tappet
Basic Operating RPM Range: 2,200-7,400 RPM
Intake Duration at 050 inch Lift: 228
Exhaust Duration at 050 inch Lift: 230
Duration at 050 inch Lift: 228 int./230 exh.
Advertised Intake Duration: 281
Advertised Exhaust Duration: 283
Advertised Duration: 281 int./283 exh.
Intake Valve Lift with Factory Rocker Arm Ratio: 0.571 in.
Exhaust Valve Lift with Factory Rocker Arm Ratio: 0.573 in.
Valve Lift with Factory Rocker Arm Ratio: 0.571 int./0.573 exh. lift
Lobe Separation (degrees): 112
Intake Valve Lash: 0.000 in.
Exhaust Valve Lash: 0.000 in.
Computer Controlled Compatible: No
Grind Number: XR281HR
Quantity: Sold individually.
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02-27-2007, 03:29 PM #5
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02-27-2007, 03:30 PM #6
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02-27-2007, 04:05 PM #7
Sorry, but I'm too lazy to look for examples.
And keep in mind that there is no direct relationship between advertised and aftermarket duration values. So, not all cams with a 283 advertised duration will have an aftermarket duration of 230. It also depends on the ramp rate. Just thought I'd throw that out there.
As far as the pushrods, make sure you get hardened pushrods as preventative maintance from bent or snapped ones.Last edited by BlackLT1Z28; 02-27-2007 at 04:26 PM.
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02-27-2007, 05:43 PM #8
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Red Tint Jewelcoat- 2008 Trailblazer SS
Running stock lifters??
Base circle of the new cam is most likely a little smaller than the stocker.
Either 7.400" (stock'ish') or 7.425" pushrods.
Do hardened regardless.2008 Trailblazer SS
Yank PTB3600, Kooks 1 7/8" LT's, 4" intake, E-fans, Magnaflow, Sonnax kit, tranny cooler, tune.
Lowered, HID's, tinted.
1999 Pontiac Trans Am WS.6 #1747 SOLD
531.1 RWHP 481.3 FT/Pounds all motor.
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03-02-2007, 04:06 AM #9
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03-02-2007, 05:13 AM #10
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Mystic Teal- 99 Trans Am & 01 CBR 929
eh we knew you were prone to making mistakes.. You did shell out the cash for a roush!!! just messing with ya
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03-02-2007, 05:42 AM #11
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03-02-2007, 02:02 PM #12
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03-02-2007, 02:16 PM #13
Ha, you should have got an 03-04 Cobra.
Those Roush chargers are terrible.
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03-02-2007, 02:25 PM #14
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Red Tint Jewelcoat- 2008 Trailblazer SS
Advertised on mine is only 297/306.
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03-02-2007, 03:22 PM #15
What do you mean 'ONLY'?
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03-02-2007, 03:23 PM #16
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Red Tint Jewelcoat- 2008 Trailblazer SS
It is a baby cam.
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03-02-2007, 03:28 PM #17
When I put in a TR 230/224 575/563 110 lsa, I used some 7.400 hardened pushrods by TR and they worked fine---stock ls1 block and heads. When I built my 383 using a 2006 LSX block, patriot S2 heads, and a comp 232/234 595/598 112 lsa, I had to get 7.475s. What I'm trying to say is, depends on your overall application and set up. Pushrod length checker is $20 and money well spent. Just a little too short and it will sound worse than a sewing machine.
Just my $.02 though4" Stroker Crank/4340 H Beam Rods/Forged Pistons/File to fit Plasma Moly Rings/Patriot S2 LS6 heads/Harland Sharp rockers/SLP Lid/Smooth Bellowes/Comp 232/234 595/598 112 lsa/chrome-moly push rods/LS1 Edit/LS6 intake/Spec3 clutch/Fidenza aluminum flywheel/4.10s/MAC mid-lengths/MAC ORY/SLP catback
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03-02-2007, 04:35 PM #18
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03-02-2007, 05:22 PM #19
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Red Tint Jewelcoat- 2008 Trailblazer SS
Just a little smaller.
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03-02-2007, 05:28 PM #20
Pffft. Just the difference in the cam specs could create a new cam.
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