A little advice?ported 243s and ls2 intake or ls3 heads and intake?
02-20-2013, 07:54 PM
#21
How exactly are ls3 heads new technology? Aside from the obvious, they dont have anything the older heads didnt.
I understand if you are saying they are just newer, but that doesnt mean better.
If the OP ever wants to go with more cubes and a bigger bore then changing heads would be a obvious move. But he already has the 243 castings, and theres no mention of going bigger.
If you go with ls3 heads just know valve timing is absolutely crutial, go with a proven cam, and bear in mind not all the ls3 cams are going to work because youre gonna have ptv clearance issues. If you want to flycut thats fine and dandy, but otherwise be careful what you pick.
I understand if you are saying they are just newer, but that doesnt mean better.
If the OP ever wants to go with more cubes and a bigger bore then changing heads would be a obvious move. But he already has the 243 castings, and theres no mention of going bigger.
If you go with ls3 heads just know valve timing is absolutely crutial, go with a proven cam, and bear in mind not all the ls3 cams are going to work because youre gonna have ptv clearance issues. If you want to flycut thats fine and dandy, but otherwise be careful what you pick.
02-20-2013, 08:01 PM
#24
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valves in ls3 heads are massive compared to cathedral port heads which max out at 2.08 valves unless your buy a set of high dollar all pro heads that come with big valves. the ports are shapped different and tend to flow higher number hence why gm went with the new design
02-20-2013, 08:05 PM
#25
Come on Bozz. We've been down this road too many times. About all you have left here are post ****** puking up misinformation over and over again as if they have a ******* idea what they're talking about. It's really unfortunate the people who come come here for REAL information are fed a steady diet of unsupported BS.
02-20-2013, 08:07 PM
#26
How exactly are ls3 heads new technology? Aside from the obvious, they dont have anything the older heads didnt.
I understand if you are saying they are just newer, but that doesnt mean better.
If the OP ever wants to go with more cubes and a bigger bore then changing heads would be a obvious move. But he already has the 243 castings, and theres no mention of going bigger.
If you go with ls3 heads just know valve timing is absolutely crutial, go with a proven cam, and bear in mind not all the ls3 cams are going to work because youre gonna have ptv clearance issues. If you want to flycut thats fine and dandy, but otherwise be careful what you pick.
I understand if you are saying they are just newer, but that doesnt mean better.
If the OP ever wants to go with more cubes and a bigger bore then changing heads would be a obvious move. But he already has the 243 castings, and theres no mention of going bigger.
If you go with ls3 heads just know valve timing is absolutely crutial, go with a proven cam, and bear in mind not all the ls3 cams are going to work because youre gonna have ptv clearance issues. If you want to flycut thats fine and dandy, but otherwise be careful what you pick.
Yeah I don't plan on going bigger right now. Probably just a 4.005-4.010 hone. I'd kicked around the idea of going with a 4" stroke but I thought the money would be better spent in the top end.
02-20-2013, 08:11 PM
#27
Either route you go you are gonna make good power. Myself, id stay with the cathedrals, and obviously others are gonna say opposite. If you want to see some 6.0 combos with ls3 stuff check out the g8 section. Theres some great combos in there.
**oh and maybe some others will share their vast, perfect database of knowledge
clearly they have all the right answers too.
**oh and maybe some others will share their vast, perfect database of knowledge
clearly they have all the right answers too.
02-20-2013, 08:20 PM
#28
TECH Enthusiast
Come on Bozz. We've been down this road too many times. About all you have left here are post ****** puking up misinformation over and over again as if they have a ******* idea what they're talking about. It's really unfortunate the people who come come here for REAL information are fed a steady diet of unsupported BS.
I know rightSame ****, different toilet.
02-20-2013, 08:23 PM
#29
Come on Bozz. We've been down this road too many times. About all you have left here are post ****** puking up misinformation over and over again as if they have a ******* idea what they're talking about. It's really unfortunate the people who come come here for REAL information are fed a steady diet of unsupported BS.
02-20-2013, 08:27 PM
#31
Wkmcd doesnt like me very much. Like I said, the ls3 stuff can make good power, its been proven. In fact heres one ive had book marked forever now. The avg power was great all the way across.
https://ls1tech.com/forums/dynamomet...p-446rwtq.html
But, if ls3 stuff on the small bore engine were the end all be all answer then I guess everyone who used cathedral castings is a ******* idiot, and everyone should do the ls3 heads.
https://ls1tech.com/forums/dynamomet...p-446rwtq.html
But, if ls3 stuff on the small bore engine were the end all be all answer then I guess everyone who used cathedral castings is a ******* idiot, and everyone should do the ls3 heads.
02-20-2013, 09:21 PM
#32
Wkmcd doesnt like me very much. Like I said, the ls3 stuff can make good power, its been proven. In fact heres one ive had book marked forever now. The avg power was great all the way across.
https://ls1tech.com/forums/dynamomet...p-446rwtq.html
But, if ls3 stuff on the small bore engine were the end all be all answer then I guess everyone who used cathedral castings is a ******* idiot, and everyone should do the ls3 heads.
https://ls1tech.com/forums/dynamomet...p-446rwtq.html
But, if ls3 stuff on the small bore engine were the end all be all answer then I guess everyone who used cathedral castings is a ******* idiot, and everyone should do the ls3 heads.
02-22-2013, 11:18 AM
#34
What, if any, modifications need to be made to the ls3 head to run it on a 4" bore?
Although as mentioned, they are not optimal for that bore. For the price they really can't be beat, but in terms of all out performance a smaller cathedral port will be the better choice.
Maybe if you had a 4.030 bore it might be more beneficial to go with the big valves, but at the standard 4.000 bore it's not. You will be greatly limited by cam size choice and milling.
02-22-2013, 07:41 PM
#35
Sorry to hijack the thread, but I do have a related question..
In general, are the rect ports thought to flow better at higher rpm's and cathedral at lower rpm's?
Im interested to know which type would flow better on a 6.2 at high rpm (7500).
Thanks.
In general, are the rect ports thought to flow better at higher rpm's and cathedral at lower rpm's?
Im interested to know which type would flow better on a 6.2 at high rpm (7500).
Thanks.
