Gen 6 firing order question
#1
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Gen 6 firing order question
When I ordered my cam all the vendors only listed cams for 96-00 Gen 6 motors. I thought Gen 6 was Gen 6 so I contacted Lunati and told them what I had and they suggested 20010723. I didn't realize GM changed the firing order at some point. Is that going to affect me? Mine is a 2015 Gen 6 489ci. I was assuming it had the traditional 18436572 order. Bad assumption?
Is that the only difference between the 96-00 Gen 6 and the 01-up Gen 6?
Thanks.
Is that the only difference between the 96-00 Gen 6 and the 01-up Gen 6?
Thanks.
#2
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When I ordered my cam all the vendors only listed cams for 96-00 Gen 6 motors. I thought Gen 6 was Gen 6 so I contacted Lunati and told them what I had and they suggested 20010723. I didn't realize GM changed the firing order at some point. Is that going to affect me? Mine is a 2015 Gen 6 489ci. I was assuming it had the traditional 18436572 order. Bad assumption?
Is that the only difference between the 96-00 Gen 6 and the 01-up Gen 6?
Thanks.
Is that the only difference between the 96-00 Gen 6 and the 01-up Gen 6?
Thanks.
That cam you posted, appears to be a standard 18436572 Gen 6 style big block camshaft.
Last edited by MILD THUNDER; 01-13-2017 at 04:20 PM.
#3
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Your engine is an oddball. Its not a normal "production" engine. Its based off an old style GEN 6 engine, but I am sure most will confuse it with the 8.1L GEN 7 496 truck engine. Those, have LS firing order. You can use an LS firing order camshaft in an old school BBC . Personally, I dont care for how they sound , just my opinion though.
That cam you posted, appears to be a standard 18436572 Gen 6 style big block camshaft.
That cam you posted, appears to be a standard 18436572 Gen 6 style big block camshaft.
I'd rather run the 18436572 order.
#4
Cam swap and correct the plug wire location on the distributor cap. I agree that the traditional firing order sounds better.
#5
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#7
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That's what started me down this road. I was swapping out the cam for one with the lobe. When I measured the original cam I figured out the engine builder screwed my buddy. It was a stock rebuild instead of performance parts.
#8
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There are some small incremental advantages with the later gen firing order. GM wouldn't have changed it on the LS motors otherwise. A couple of these advantages would be considered even more beneficial in a raw/open cooling system and carbureted V8 apps. (trying not to sound like BobM here). The updated firing order supposedly has a cooling benefit for one or both (7 and/or 8) of the rear cylinders. In addition to the more familiar "decreased crankshaft harmonics" advantage claim, carbureted V8's also see better fuel distribution, again with 7 and/or 8 seeing the main benefit. I'm just paraphrasing what my very with it engine builder explained to me over a period of 30 minutes. The sound difference can be a matter of taste; on a street car, I much prefer the sound of the LS/Ford firing order over the traditional GM sequence. On the water, most of us will only hear stock sounding 8.1's, and no, they don't sound as good as any bigger cammed GEN6 and older motor.
#9
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There are some small incremental advantages with the later gen firing order. GM wouldn't have changed it on the LS motors otherwise. A couple of these advantages would be considered even more beneficial in a raw/open cooling system and carbureted V8 apps. (trying not to sound like BobM here). The updated firing order supposedly has a cooling benefit for one or both (7 and/or 8) of the rear cylinders. In addition to the more familiar "decreased crankshaft harmonics" advantage claim, carbureted V8's also see better fuel distribution, again with 7 and/or 8 seeing the main benefit. I'm just paraphrasing what my very with it engine builder explained to me over a period of 30 minutes. The sound difference can be a matter of taste; on a street car, I much prefer the sound of the LS/Ford firing order over the traditional GM sequence. On the water, most of us will only hear stock sounding 8.1's, and no, they don't sound as good as any bigger cammed GEN6 and older motor.
#10
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HawkX66 ................do you have one X66 ??
Last edited by F-2 Speedy; 01-18-2017 at 08:35 AM.