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228/232 115+2 LSK lobes

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Old 03-26-2007 | 04:30 PM
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Default 228/232 115+2 LSK lobes

I am thinking of getting this cam to go with a set of PRC LS6 heads with 60cc chambers and .04 Cometics. The plan is have it ground staight up and then use an adjustable timing set to add the advance. The DCR should be right about 8.75 and if that proves to be too much I'll take some of the advance out (or get better gas heheh). I'm hoping it will be easy to tune and have good manners since it is a daily driver and rarely gets above 3000 RPMS.
A few questions:

1. Is there any way of calculating what size pushrods I will need or will I have to buy some sort of length checker?

2. Using PianoProdigy's calc it looks like the EVC will be 1 degree before TDC. Does this mean I won't have to worry about fly cutting?

3. The calc also shows 0 degrees overlap at .05. I want little or no lope. Is this going to lope or do I need to get more LSA ground in?
Old 03-26-2007 | 05:06 PM
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Originally Posted by MISERICORDIA
I am thinking of getting this cam to go with a set of PRC LS6 heads with 60cc chambers and .04 Cometics. The plan is have it ground staight up and then use an adjustable timing set to add the advance. The DCR should be right about 8.75 and if that proves to be too much I'll take some of the advance out (or get better gas heheh). I'm hoping it will be easy to tune and have good manners since it is a daily driver and rarely gets above 3000 RPMS.
A few questions:

1. Is there any way of calculating what size pushrods I will need or will I have to buy some sort of length checker?

2. Using PianoProdigy's calc it looks like the EVC will be 1 degree before TDC. Does this mean I won't have to worry about fly cutting?

3. The calc also shows 0 degrees overlap at .05. I want little or no lope. Is this going to lope or do I need to get more LSA ground in?
1. Use 7.400" pushrods with that mill and gasket.

2. DCR will be closer to 8.55:1. Duration at .006" is closer to 278/282 with 227/231 LSK lobes when measured on the Cam Doctor. Use that number as that's what reality will be.

3. 0 degrees of overlap will have lope if you set the idle low enough. A 224/224 112LSA cam also has 0 degrees of overlap at .050". They're known for having some lope. If you want stealth, raise idle speed and increase timing (or select a cam with less overlap). Don't go wider than 115LSA. Your area under the curve is going to get worse if you do.
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2000 Pewter Ram Air Trans Am M6 heads/cam 508 rwhp/445 rwtq SAE, 183.092 TX Mile
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2023 Corvette 3LT Z51 soon to be modified.
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Old 03-26-2007 | 06:01 PM
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Thanks for the help.
Will the LSK lobes have a smaller base circle that I need to worry about for the pushrod length? Will I need to worry about fly cutting?
Old 03-26-2007 | 06:07 PM
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Originally Posted by MISERICORDIA
Thanks for the help.
Will the LSK lobes have a smaller base circle that I need to worry about for the pushrod length? Will I need to worry about fly cutting?
The LSK lobes have a much smaller base circle than stock, but your head milling and thinner head gasket will compensate for the difference. You will be OK on piston to valve clearance because your duration is fairly short and your intake centerline is not very advanced.
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2013 Corvette Grand Sport A6 LME forged 416, Greg Good ported TFS 255 LS3 heads, 222/242 .629"/.604" 121LSA Pat G blower cam, ARH 1 7/8" headers, ESC Novi 1500 Supercharger w/8 rib direct drive conversion, 747rwhp/709rwtq on 93 octane, 801rwhp/735rwtq on race fuel, 10.1 @ 147.25mph 1/4 mile, 174.7mph Half Mile.
2016 Corvette Z51 M7 Magnuson Heartbeat 2300 supercharger, TSP LT headers, Pat G tuned, 667rwhp, 662rwtq, 191mph TX Mile.
2009.5 Pontiac G8 GT 6.0L, A6, AFR 230v2 heads. 506rwhp/442rwtq. 11.413 @ 121.29mph 1/4 mile, 168.7mph TX Mile
2000 Pewter Ram Air Trans Am M6 heads/cam 508 rwhp/445 rwtq SAE, 183.092 TX Mile
2022 Cadillac Escalade 6.2L A10 S&B CAI, Corsa catback.
2023 Corvette 3LT Z51 soon to be modified.
Custom LSX tuning in person or via email press here.

Old 03-26-2007 | 08:48 PM
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224/228 113 113 would get to 8.71 DCR by my estimate and have zero overlap. Probably have a little more throttle response at 2500 than the bigger duration cam.



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