Ls3 416 gto
06-07-2013, 04:49 PM
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Ls3 416 gto Hey guys!! Figure I'd post my first build. Parts are coming in everyday. I'm getting rid of the LS1 and moving on to bigger and better things. LS3 block bored 4.070 to make 416 cubic inches of a tire shredding torque monster. Mahle forged pistons, Eagle 4.000" stroke crank, Eagle 6.200" rods with ARP2000 bolts, ARP head studs to keep everything in tact. I have plans on eventually using a 200 shot of the giggly. Kooks 1 7/8 long tubes to be connected to a full 3 inch exhaust. Currently working on cam specs, it's going to be huge!! With a LS3 style car intake I'm hoping to make 550rwhp on 11.25:1 compression with a 6 speed. To be continued....
Last edited by jdub38672; 06-07-2013 at 04:57 PM.
06-07-2013, 07:36 PM
#4
Make sure you buy all parts(including pistons) BEFORE YOU GET the block bored and honed. Make sure you also go wild cam specs with very aggressive ramps and HD/solid/SS valves so they will take the high rpms. I think some YT 1.8s would be killer too.
Last edited by Jimbo1367; 07-04-2013 at 06:05 PM.
06-08-2013, 07:08 AM
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Thanks for the advise I'm a little further in the build than my post reflect. The rotating assembly I purchased is balanced and double checked. I went with LS3 rockers with the comp trunion upgrade. Lunati double springs have been purchased as well. Now for pistons I picked a Mahle 2618 forged piston that will be nitrous friendly in the future. The block has been bored as well to the specs of the pistons.
06-08-2013, 09:05 AM
#7
You do not need to go wild with the cam to make good power with a 416 LS3 headed setup. Lightweight valves such as the LS3's would be a good choice to help in valvetrain stability.
One question, why did you go with a 6.200 rod? That takes away from the compression height of the piston and in turn makes it not a good thing to run nitrous on. I'm not saying you can't but you would have to watch your tune and be conservative on it with spraying nitrous on a piston with a shorter compression height.
One question, why did you go with a 6.200 rod? That takes away from the compression height of the piston and in turn makes it not a good thing to run nitrous on. I'm not saying you can't but you would have to watch your tune and be conservative on it with spraying nitrous on a piston with a shorter compression height.
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06-08-2013, 11:51 AM
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You do not need to go wild with the cam to make good power with a 416 LS3 headed setup. Lightweight valves such as the LS3's would be a good choice to help in valvetrain stability.
One question, why did you go with a 6.200 rod? That takes away from the compression height of the piston and in turn makes it not a good thing to run nitrous on. I'm not saying you can't but you would have to watch your tune and be conservative on it with spraying nitrous on a piston with a shorter compression height.
One question, why did you go with a 6.200 rod? That takes away from the compression height of the piston and in turn makes it not a good thing to run nitrous on. I'm not saying you can't but you would have to watch your tune and be conservative on it with spraying nitrous on a piston with a shorter compression height.
06-08-2013, 12:10 PM
#9
Just personal preference, I like to put the longest rod I can in my motors within reason. Using the 6.200 rod still leaves a decent compression height on the pistons. I also chose a 2618 piston vs. 4032 material to compenstate for the etra heat from the nitrous I plan on using. Not quite sure on the valves I'm using, they are stock valves that come in LSA heads. I will post a pic of my assembled heads later today. Keep in mind the most spray my setup will see will be 200 or less.
06-08-2013, 10:12 PM
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For only a 200 the piston material is not going to really matter because you are not going to make enough heat to damage either one. You would want to worry more about the wrist pin getting up into the ring pack with that longer rod. Nitrous and ring lands up higher than normal are not a good combination. Just keep that in mind when tuning it on the bottle.
06-09-2013, 05:58 PM
#15
Lol it's useful due to the cam bucking a Lil but I can careless about that. The 4.11's help with that. I wish I could have gone with a bigger cam, the cubes suck it all up. It is a blast to drive bud. I hope you meet your goals, it's not too late to make a few adjustments if you'd like before you have regrets later bud. If your happy with it it's all good bud. In for the results that's for sure.
06-09-2013, 07:25 PM
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Yeah I agree with you not too worried about the cam bucking a little. Having a 6 speed helps in the area. Probably going to keep my stock gearing for now.
06-09-2013, 07:28 PM
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I have several ideas just haven't narrowed it down yet. Hopefully I will have my mind made up by this week. Planning on building the short block next week. Melling high volume pump, ls7 lifters, timing chain, and tensioner are in boxes ready to go. I will post pics of those tomorrow. All I can tell you is the cam is going to be huge!! I will let you know specs soon.