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I find this article kinda interesting,,may won't to note the split on the winning cam.:D
http://www.superchevy.com/how-to/eng...ower-cam-test/ |
Originally Posted by sutphen 30
(Post 4533342)
I find this article kinda interesting,,may won't to note the split on the winning cam.:D
http://www.superchevy.com/how-to/eng...ower-cam-test/ Not surprising that much cam split did well, when you look at the flow numbers from a stock LS3 head. |
Originally Posted by JRider
(Post 4533160)
I believe my Lunati cam for my 575sci is 240/[email protected] .642/.642 114ls 110icl, I havnt even fired the motor yet but I wish I would have went a little bigger and did the 4/7 swap. Also not sure about the 5* split. At this point I dont think it would be worth the investment as I dont have anything to put it in. So, with AFR325 cnc chambered, stripped 871 with whipple chiller, stock 502 bore, 8.25:1 CMI ETops...what is my safe estimated HP on 93? The problem I see is supplying enough fuel with the dump truck injection system.
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4/7 swap makes the firing order the same as the LS and 8.1, it makes a few more horsepower, about 15? cant exactly remember, but I was told it has to do with crank shaft flex. All that needs to be done is swap the wires on the cap. NASCAR uses that firing order as well.
Yes, mine is standard bore 502, I would have went to a 540 if I knew my injection could supply it. |
single swap, 4/7......C swap......4/7 3/2 ( double ) minimal gain maybe less than 10hp @ over 6000 revs from what I've read, I ran C-swap in my 540's, you can really hear a difference through the headers. I think the Pro stock guys started this way back in the day, it is suppose to be easier on the crank and bearing's tho.
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Originally Posted by JRider
(Post 4588658)
4/7 swap makes the firing order the same as the LS and 8.1, it makes a few more horsepower, about 15? cant exactly remember, but I was told it has to do with crank shaft flex. All that needs to be done is swap the wires on the cap. NASCAR uses that firing order as well.
Yes, mine is standard bore 502, I would have went to a 540 if I knew my injection could supply it. |
Stock ls3 flow numbers
2 Attachment(s)
Originally Posted by MILD THUNDER
(Post 4533352)
Cool article. Pretty clear the big cam simply won. Bigly.
Not surprising that much cam split did well, when you look at the flow numbers from a stock LS3 head. 0.617/0.595-inch lift split, a 231/248- if the numbers inked below are confimed correct then it does make sense with what I would consider to be a funky cam. The exhaust flows like 2/3 the intake vs more common heads 3/4 especially aftermarket. Ratio varies lift depending but in a nutshell I can see how they came up with that grind after looking at the flow numbers. |
Originally Posted by F-2 Speedy
(Post 4588664)
single swap, 4/7......C swap......4/7 3/2 ( double ) minimal gain maybe less than 10hp @ over 6000 revs from what I've read, I ran C-swap in my 540's, you can really hear a difference through the headers. I think the Pro stock guys started this way back in the day, it is suppose to be easier on the crank and bearing's tho.
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Originally Posted by Rookie
(Post 4588777)
I run the 2/3, 4/7 swap and you can definitely tell the difference. Kinda takes the bark away from the big block. It sounds tame, but smooth.
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Originally Posted by LTZCrew
(Post 4588703)
with that cam how high are you planning on spinning it? im in the same boat on my build currently
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