4-7 Swap on LT1 camshaft??
12-29-2007, 07:56 PM
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4-7 Swap on LT1 camshaft?? This is something that I've never heard talked about on an LT1. On old school motors you can do a 4-7 swap on the camshaft(custom grind cam). Swaping the fireing order on the #4 and #7 cylinders, thus doing this you can gain you 30 horsepower to your small block. LS1 motors come like this from the factory, but not older small block, and not the LT1 I assume.
12-29-2007, 08:00 PM
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This is something that I've never heard talked about on an LT1. On old school motors you can do a 4-7 swap on the camshaft(custom grind cam). Swaping the fireing order on the #4 and #7 cylinders, thus doing this you can gain you 30 horsepower to your small block. LS1 motors come like this from the factory, but not older small block, and not the LT1 I assume.
12-29-2007, 08:49 PM
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opti or no opti should not make any difference, just swap the 4 and 7 plug wires on the opti...itll look a little goofy with two plug wires snaking around the "wrong" side of the opti...
First time i heard of this was about a month after cam motion made my custom ground cam....or else i would have done it.
First time i heard of this was about a month after cam motion made my custom ground cam....or else i would have done it.
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12-29-2007, 09:37 PM
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Claims of 30 hp are way on the heavy side...internet racing at its best. There have been several dyno comparisons and the results are usually in the range that 98pontiacfirefalk spoke of. In some classes of racing it can justify the added expense, but for most engine builds, the expense won't outweigh the small gain.
12-29-2007, 09:59 PM
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Smoother and broader torque curve, thats what I've always heard. No difference other than swapping wires. Hmmm... I had this on my ol 358 iroc may be I'll try it on my LT1 when I do my build. I just didn't know if the same rule apply from one small block to another.
12-29-2007, 10:54 PM
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a couple hp and overall smoother running. The decrease in main cap loads should greatly increase the life of a racing engine...yes?
some reading... http://www.hotrod.com/techfaq/113_07...ams/index.html
some reading... http://www.hotrod.com/techfaq/113_07...ams/index.html
12-29-2007, 11:55 PM
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This is something that I've never heard talked about on an LT1. On old school motors you can do a 4-7 swap on the camshaft(custom grind cam). Swaping the fireing order on the #4 and #7 cylinders, thus doing this you can gain you 30 horsepower to your small block. LS1 motors come like this from the factory, but not older small block, and not the LT1 I assume.
Last edited by SincalT/A; 12-30-2007 at 12:25 AM.
12-30-2007, 12:09 AM
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If you find someone that has some 4/7 swap LT1 cam cores shoot me a PM please. My cam grinder is having difficulty finding them.
Does anyone have a 4/7 swap LT1 and if so where did you get it? I can get one custom made out of billet but thats about $1000 :O
Does anyone have a 4/7 swap LT1 and if so where did you get it? I can get one custom made out of billet but thats about $1000 :O
12-30-2007, 01:38 AM
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A smoother running motor, that puts less stress on the main bearings..... YES. 30 more HP.......................... NO. I think you have been watching to much TV. This may be a good idea for a motor making 800+ hp. Other than that dont even think about it.
12-30-2007, 01:45 AM
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i guess i didn't look hard enuff, i wanted to do a 'B' cam as well (4-7swap) but unfortunately I was told it wasn't feasible. at least from Comp and one other company. oh well. LS1 is a 'C' cam.
my builder even called cam motions to inquire about it, he didn't get the answers he wanted so he moved on. I am fine with it, i trust his decisions.
had something to do with a different billet core. whatever...........
harmonics and also less heat (specifically those cylinders) main benefits. dunno if that made sense.
my builder even called cam motions to inquire about it, he didn't get the answers he wanted so he moved on. I am fine with it, i trust his decisions.
had something to do with a different billet core. whatever...........
harmonics and also less heat (specifically those cylinders) main benefits. dunno if that made sense.
12-30-2007, 02:07 AM
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i guess i didn't look hard enuff, i wanted to do a 'B' cam as well (4-7swap) but unfortunately I was told it wasn't feasible. at least from Comp and one other company. oh well. LS1 is a 'C' cam.
my builder even called cam motions to inquire about it, he didn't get the answers he wanted so he moved on. I am fine with it, i trust his decisions.
had something to do with a different billet core. whatever...........
harmonics and also less heat (specifically those cylinders) main benefits. dunno if that made sense.
my builder even called cam motions to inquire about it, he didn't get the answers he wanted so he moved on. I am fine with it, i trust his decisions.
had something to do with a different billet core. whatever...........
harmonics and also less heat (specifically those cylinders) main benefits. dunno if that made sense.
I'll definatley update this if I happen to find someone that has some. There were people at PRI looking specifically for a vendor that had some, but I haven't heard whether they were successful in the search or not.
12-30-2007, 02:08 AM
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What kind of TV program you know that would give a **** about an LT1. Get real!! I asked a simple guestion and I got simple answers.
12-30-2007, 02:10 AM
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I'm not sure who A.I. uses to grind their cams or if they do them in house. Any one??