ls6 heads
#6
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Originally Posted by zamboxl
so it's not really worth replacing ls1 heads with ls6, just go with ported ls1 heads???? or is it worth it?
When choosing a head, it is more important to look at mid lift flow #'s than peak.
.250>.300>.400
since this is where the power needs to be made. So ideally you match your cam specs to the heads potential at mid lifts and avoid potential choking or worse over porting situations.
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Originally Posted by PREDATOR-Z
Well the LS6 castings flow better, have better velocity, and different combustion chambers, also I believe the runner shape is slightly different.
When choosing a head, it is more important to look at mid lift flow #'s than peak.
.250>.300>.400
since this is where the power needs to be made. So ideally you match your cam specs to the heads potential at mid lifts and avoid potential choking or worse over porting situations.
When choosing a head, it is more important to look at mid lift flow #'s than peak.
.250>.300>.400
since this is where the power needs to be made. So ideally you match your cam specs to the heads potential at mid lifts and avoid potential choking or worse over porting situations.
edit:: i wouldn't want to waist my time and money on ls6 heads if iam not going to see or feel any difference you know
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Originally Posted by PREDATOR-Z
Let me put it this way:
LS1 stage II good
LS6 stage II better, but true LS6 castings "243"
LS1 stage II good
LS6 stage II better, but true LS6 castings "243"
ls6 stage nothing ????
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Originally Posted by zamboxl
??????
#12
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zamboxl, get a hold of those ls6 heads for a good price and send them to TEA. Ask for the Stage 2.5 setup. They will kick serious ***.
But then again AFR's will cost you the same in the end.
But then again AFR's will cost you the same in the end.
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cool thanks for all the help and input guys i think i'll just wait a little bit, save some money and go with the afr or some other ported ls6 heads. But i guess it wouldn't hurt to check out the 5.3 heads also.
#15
Originally Posted by SouthFL.02.SS
zamboxl, get a hold of those ls6 heads for a good price and send them to TEA. Ask for the Stage 2.5 setup. They will kick serious ***.
But then again AFR's will cost you the same in the end.
But then again AFR's will cost you the same in the end.
I thought TEA no longer existed?
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I don't claim to be an expert by any means.
I read an article in an old issue of GMHTP where they compared ARE ported LS1 heads to (I think) ported LS6 heads and the LS1 heads actually outflowed the LS6's up until around .350" lift. It was after that the LS6 heads took over but still the difference was minimal. You're going to be driving the car at low to mid lift most the time unless this is a track only car so like Predator said, those numbers are going to be of more importance.This is also mentioed in the article.
This was an 00" or 01" issue so maybe things have changed since then in the world of LS1 heads. Like I said I'm no expert.
I am also in the process of researching heads/cam for my 01 SS.
I'll see if I can find the article if you like.
BTW, GM parts direct sells a set of CNC ported LS6 heads for around $922ea.
GM PART # 88958622
From what I understand these are milled .055 so you will have to be careful on cam selection and check your valvetrain geometry. I was told they also sell a set of ported ls6 heads which are not milled but I don't know the part no. offhand.
I read an article in an old issue of GMHTP where they compared ARE ported LS1 heads to (I think) ported LS6 heads and the LS1 heads actually outflowed the LS6's up until around .350" lift. It was after that the LS6 heads took over but still the difference was minimal. You're going to be driving the car at low to mid lift most the time unless this is a track only car so like Predator said, those numbers are going to be of more importance.This is also mentioed in the article.
This was an 00" or 01" issue so maybe things have changed since then in the world of LS1 heads. Like I said I'm no expert.
I am also in the process of researching heads/cam for my 01 SS.
I'll see if I can find the article if you like.
BTW, GM parts direct sells a set of CNC ported LS6 heads for around $922ea.
GM PART # 88958622
From what I understand these are milled .055 so you will have to be careful on cam selection and check your valvetrain geometry. I was told they also sell a set of ported ls6 heads which are not milled but I don't know the part no. offhand.
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Originally Posted by SLPSS01
...
I'll see if I can find the article if you like.
BTW, GM parts direct sells a set of CNC ported LS6 heads for around $922ea.
GM PART # 88958622
From what I understand these are milled .055 so you will have to be careful on cam selection and check your valvetrain geometry. I was told they also sell a set of ported ls6 heads which are not milled but I don't know the part no. offhand.
I'll see if I can find the article if you like.
BTW, GM parts direct sells a set of CNC ported LS6 heads for around $922ea.
GM PART # 88958622
From what I understand these are milled .055 so you will have to be careful on cam selection and check your valvetrain geometry. I was told they also sell a set of ported ls6 heads which are not milled but I don't know the part no. offhand.
Fred Bean Pontiac will charge $55. That's where I'd get them. Do they offer this head W/O the valves and springs?
#18
I am replying to this because i like finding info that is usefull, so i want to contribute. My experience with LS6 vs.Ls1 heads is that when both are ported to competitive flow levels, the LS6 head flows around 20 cfm higher with intake bolted on for flow testing. This is important consideration. If i had to answer why, i would say port width on LS6 head is larger than Ls1 casting is capable in short side turn area. LS6 intake compliments this width of intake port, as they were designed together. My own personal next step will be to r+d 6.0 head port to flow LS6 ported #'s with close to stock port volume size. Using stock valve sizes this will give me excellent power with same med. size cam and no AFR or GM CNC LS6 price tag.( I am completely impressed with AFR heads just no money on my end BTW) As for getting compression back i will shave 6.0 heads around .060" and set PTV clearance as needed.
I hope this helps, i believe im on right track.
I hope this helps, i believe im on right track.
#19
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Originally Posted by LSonederfull
I am replying to this because i like finding info that is usefull, so i want to contribute. My experience with LS6 vs.Ls1 heads is that when both are ported to competitive flow levels, the LS6 head flows around 20 cfm higher with intake bolted on for flow testing. This is important consideration. If i had to answer why, i would say port width on LS6 head is larger than Ls1 casting is capable in short side turn area. LS6 intake compliments this width of intake port, as they were designed together. My own personal next step will be to r+d 6.0 head port to flow LS6 ported #'s with close to stock port volume size. Using stock valve sizes this will give me excellent power with same med. size cam and no AFR or GM CNC LS6 price tag.( I am completely impressed with AFR heads just no money on my end BTW) As for getting compression back i will shave 6.0 heads around .060" and set PTV clearance as needed.
I hope this helps, i believe im on right track.
I hope this helps, i believe im on right track.
are you the same "LSonederfull" as "LS1derfull"?
#20
Jerami, yes i am same LS1derfull, my password info is packed away with my home furniture etc.(moved to South Carolina) To answer your question, 10 cfm at low lifts up to 20 cfm at .600"lift is what LS6 head has over LS1 both with same LS6 manifold bolted to heads.