Machine shop says a 408 isnt good for boost...
03-25-2010, 03:18 PM
#41
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Well I told them what heads I had and the specs on them and I told them the desired CR(9.0-9.5). I was just wanting them to do the machine work and put in the crank, pistons, etc. I can handle putting on heads, cam, lifters and so on.
03-25-2010, 03:29 PM
#42
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I guess all those 408's making 650+ RWHP on boost don't know what they're doingthe 408 is Just fine for his Turbo setup..
03-25-2010, 03:32 PM
#43
GM could have upped the cubes in the LS9 but instead went with a 6.2L (~376ci). I would think they went that route more for reliability than all out power. They even made a forged 3.62" stroke crankshaft specifically for the LS9. So ultimately, I think the answer depends on what your goals are. If you're after maximum power go with the 408+. For maximum reliability go with the 370. Dan
03-25-2010, 06:59 PM
#44
reguardless of the CI a motor built right and put together with the right parts is going to make power. why wouldnt a built 408 with plenty of boost and a good set of heads and cam to flow it make retarded power? its all in what you put in it the determines whether or not its a good "boost motor" because any motor has the potential to be a "boost motor". thats like sayin a built lsx 454ci with plenty of cubes to turn twins or even a big single and tons of boost would be slow compared to its n/a counterpart it just doesnt make any sense. as long as thought is put into the parts being used and where you want to go in the motor whether its n/a or otherwise its gonna run excelent but thats just my 2 cents
OP, how fast do you want to go? Mine's going 8.98 with a stock crank and only 370 ci. Fireball went 7.9 with his little cube motor. Mighty Mouse went 8.6, I believe, with his car. Why not put the extra thousand that you will save on a crank into something else? Like an upgraded turbo. It will net you more power and be more reliable in the long run.
03-25-2010, 07:07 PM
#46
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OP, how fast do you want to go? Mike's going 8.98 with a stock crank and only 370 ci. Fireball went 7.9 with his little cube motor. Mighty Mouse went 8.6, I believe, with his car. Why not put the extra thousand that you will save on a crank into something else? Like an upgraded turbo. It will net you more power and be more reliable in the long run.
03-27-2010, 11:42 AM
#48
438" with a 4" stroke, you do the math. Fireball purchased a motor from Harlan if memory serves me correctly. I'd bet if he were to do it all over again from scratch, he would have a 4" stroke. You can either follow everyone else or lead. We're choosing the latter, in less than 20 passes we've gone quicker and faster than any other LSx radial hotrod to the 1/8 mile with less equipment. So 4" strokes don't work. Shawn and I can't imagine how far we would be if we had a couple years of testing under our belts.
03-27-2010, 12:08 PM
#49
438" with a 4" stroke, you do the math. Fireball purchased a motor from Harlan if memory serves me correctly. I'd bet if he were to do it all over again from scratch, he would have a 4" stroke. You can either follow everyone else or lead. We're choosing the latter, in less than 20 passes we've gone quicker and faster than any other LSx radial hotrod to the 1/8 mile with less equipment. So 4" strokes don't work. Shawn and I can't imagine how far we would be if we had a couple years of testing under our belts.
03-27-2010, 05:52 PM
#54
Ouch. My guy is pretty good. He builds LOTS of LS motors. He builds every motor that goes into these. Shop is Total Engine Concepts. Call JE. They know him.
Why do suppose that GM put a longer sleeve in the one LS motor that they make with a 4" stroke?
03-27-2010, 07:16 PM
#55
Why do suppose that GM put a longer sleeve in the one LS motor that they make with a 4" stroke?
That makes sense to me for the 427 ls7 the longer skirt will help with a better piston and ring set. How long are the skirts in a lsx block? I was gong to drop in cubes for better oil control bet a builder said for my goals a 427 lsx would do the trick easy and I belive him. I guess it all comes down to budget and preferance. Hell I like fireball, mighy mouse and phills set up they are making the power I hope to make with less cubes and more boost. But with the bigger motor it will take less boost to make the same power if not more. Hell I dont know I may just go with a superdeck2 500 ci with 20 pis and be done with it lol.
That makes sense to me for the 427 ls7 the longer skirt will help with a better piston and ring set. How long are the skirts in a lsx block? I was gong to drop in cubes for better oil control bet a builder said for my goals a 427 lsx would do the trick easy and I belive him. I guess it all comes down to budget and preferance. Hell I like fireball, mighy mouse and phills set up they are making the power I hope to make with less cubes and more boost. But with the bigger motor it will take less boost to make the same power if not more. Hell I dont know I may just go with a superdeck2 500 ci with 20 pis and be done with it lol.
03-27-2010, 07:26 PM
#56
Why do suppose that GM put a longer sleeve in the one LS motor that they make with a 4" stroke?
That makes sense to me for the 427 ls7 the longer skirt will help with a better piston and ring set. How long are the skirts in a lsx block? I was gong to drop in cubes for better oil control bet a builder said for my goals a 427 lsx would do the trick easy and I belive him. I guess it all comes down to budget and preferance. Hell I like fireball, mighy mouse and phills set up they are making the power I hope to make with less cubes and more boost. But with the bigger motor it will take less boost to make the same power if not more. Hell I dont know I may just go with a superdeck2 500 ci with 20 pis and be done with it lol.
That makes sense to me for the 427 ls7 the longer skirt will help with a better piston and ring set. How long are the skirts in a lsx block? I was gong to drop in cubes for better oil control bet a builder said for my goals a 427 lsx would do the trick easy and I belive him. I guess it all comes down to budget and preferance. Hell I like fireball, mighy mouse and phills set up they are making the power I hope to make with less cubes and more boost. But with the bigger motor it will take less boost to make the same power if not more. Hell I dont know I may just go with a superdeck2 500 ci with 20 pis and be done with it lol.
This year should be 40-45 if not more.
03-27-2010, 07:27 PM
#57
Sorry, I missed the iron block part. I thought you were using that new super badass block that you guys were talking about not that long ago.
Ouch. My guy is pretty good. He builds LOTS of LS motors. He builds every motor that goes into these. Shop is Total Engine Concepts. Call JE. They know him.
Why do suppose that GM put a longer sleeve in the one LS motor that they make with a 4" stroke?
Ouch. My guy is pretty good. He builds LOTS of LS motors. He builds every motor that goes into these. Shop is Total Engine Concepts. Call JE. They know him.
Why do suppose that GM put a longer sleeve in the one LS motor that they make with a 4" stroke?
03-27-2010, 08:01 PM
#58
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Veee8's new motor is a 4'' stroke and Fireball's would have been a 4'' stroke if he could have sold the 3.622 stroke crank.Phil's is a 4'' stroke with a 5.600 sleeve length-not optimal but it works.I have built tons of 4'' stroke motors with no issues.
03-27-2010, 08:04 PM
#59
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Sorry, I missed the iron block part. I thought you were using that new super badass block that you guys were talking about not that long ago.
Ouch. My guy is pretty good. He builds LOTS of LS motors. He builds every motor that goes into these. Shop is Total Engine Concepts. Call JE. They know him.
Why do suppose that GM put a longer sleeve in the one LS motor that they make with a 4" stroke?
Ouch. My guy is pretty good. He builds LOTS of LS motors. He builds every motor that goes into these. Shop is Total Engine Concepts. Call JE. They know him.
Why do suppose that GM put a longer sleeve in the one LS motor that they make with a 4" stroke?
03-27-2010, 08:20 PM
#60
We all know the 4" stroke stuff makes plenty of power in a street strip or race car but what about when your driving 15k a year plus making a couple hundred trips down the track? I think thats where you would want a longer sleeve with the 4" stroke.