2.055 valves or more?
11-10-2005, 02:48 AM
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2.055 valves or more? Ok my friend is building a 6.0l ls1 fbody. Heads, cam whole 9 with a th-350 and a brake. With a direct port system. He is trying to get in the 9's with this motor. He is getting his heads ported to stage 3 but is wondering if 2.055 valves are the best choice for him or should he go with bigger valves. He will only drive this car 15miles a week. He wants the best possible motor. What yall think?
11-10-2005, 12:21 PM
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Originally Posted by ls1formula454
Ok my friend is building a 6.0l ls1 fbody. Heads, cam whole 9 with a th-350 and a brake. With a direct port system. He is trying to get in the 9's with this motor. He is getting his heads ported to stage 3 but is wondering if 2.055 valves are the best choice for him or should he go with bigger valves. He will only drive this car 15miles a week. He wants the best possible motor. What yall think?
Go with 2.080's.
11-11-2005, 12:28 PM
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Originally Posted by ls1formula454
Ok my friend is building a 6.0l ls1 fbody. Heads, cam whole 9 with a th-350 and a brake. With a direct port system. He is trying to get in the 9's with this motor. He is getting his heads ported to stage 3 but is wondering if 2.055 valves are the best choice for him or should he go with bigger valves. He will only drive this car 15miles a week. He wants the best possible motor. What yall think?
You did not say anything about the bottom end being stock. Since you are going with a direct port N2 system, I just assumed that you had a forged shortblock. Good luck on that by the way. You might just be the worlds first stock bottom end 6.0L with a direct port nitrous to run in the 9's
If you really want to use 2.055 valves, then go ahead. I'm just telling you what I would do. Since you've got a larger displacement motor, it seems to me that your leaving some horsepower on the table by going with the 2.055. Especially with a cam that size, I think the 2.080 is a better choice. But I wouldn't bet any money that your stock bottom end will last any longer than 1 pass. And I doubt going from a 2.055 to a 2.080" valve will be the deciding factor on whether the bottom end holds up or not.
11-13-2005, 07:40 PM
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The car is planned to get a 408ci forged bottom end in the end of next year. But I am confused a little. I have a friend that has a similar setup but with stage 1 heads and stock valves and he is spraying a 225 wet shot all day long w/o trouble. Why would this car blow up on only 200 shot? Is it because the fact that it is a direct port system or what? If thats the case we could always switch it to a wet kit. We just wanted to buy a kit once since next year we would get a direct port kit with the 408 anyways. Let me know, thanks.
11-14-2005, 06:39 AM
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Um, a direct port setup is a wet kit. Well, I sure hope yours is a wet shot.
If you were spraying a 200 dry shot, I'd be more worried about melting those brand new 055 valves, than I would flattening those main bearings.
If you were spraying a 200 dry shot, I'd be more worried about melting those brand new 055 valves, than I would flattening those main bearings.
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11-14-2005, 11:31 AM
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Well I know the direct port is a wet shot, but what I meant was the position of where the nitrous is entered through. Does that make the difference? The guy that is building the motor says that the 6.0l iron block can hold a 200shot easy. Is there any truth in that?
11-14-2005, 06:46 PM
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Originally Posted by ls1formula454
Well I know the direct port is a wet shot, but what I meant was the position of where the nitrous is entered through. Does that make the difference? The guy that is building the motor says that the 6.0l iron block can hold a 200shot easy. Is there any truth in that?
Wet shot = nitrous + fuel.
Dry shot = nitrous.
A dry shot is generally injected before the MAF, so the computer can sense the extra air and add the appropriate fuel. The ECU, however, cannot accommodate a 200 dry shot.
Yes, the motor itself can handle a 200 shot, but only a 200 shot done properly.
