flow bench results inside!! Ported LS1 vs Ported 5.3 vs Ported LS6
12-19-2007, 06:41 PM
#21
The LS6s are definitely better. I mean look at .200-.500 the LS6 heads just about rape them in that category. Flow at .600 means jack **** when you dont have an intake to flow that much air anyways 
.. I've got ported 5.3s also that ill be putting on a bench soon and maybe whenever i get that done ill post my results.
.. I've got ported 5.3s also that ill be putting on a bench soon and maybe whenever i get that done ill post my results.
12-19-2007, 06:54 PM
#22
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thanks for the chart! 
im still probably going to go with the 5.3s to match my ms3. they have always seemed to be great performers with tsps cnc port job on them.
im still probably going to go with the 5.3s to match my ms3. they have always seemed to be great performers with tsps cnc port job on them.
12-19-2007, 08:27 PM
#23
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While i agree that out of these three heads the LS6's are definately the way to go, without knowing who ported the heads or WHEN they were ported it is impossible to say whether it is because of the heads or rather because of the port work performed. As poinetd out before, some of the earlier port designs were not on par with the latest programs out there. What would be really cool, but much too expensive, would be to have someone flow each of these 3 heads with the same degree of porting from the same porter out there and then see how they compare to the same test with other porters. Of course what this does show, is that any of the heads will perform admirably with some attention.
12-20-2007, 08:20 PM
#28
What would be really interesting is 3 sets of heads, all the same casting numbers, CNC ported by 3 different companies, flow tested, then dyno tested. Talk about starting a war!!!!
Or, 3 sets of heads, different casting #s, all CNC ported, all from the same company. That would be the best test of the dif in the castings.
CNC is the way to go. Takes the individuality out of it.
Or, 3 sets of heads, different casting #s, all CNC ported, all from the same company. That would be the best test of the dif in the castings.
CNC is the way to go. Takes the individuality out of it.
12-20-2007, 08:44 PM
#29
What would be really interesting is 3 sets of heads, all the same casting numbers, CNC ported by 3 different companies, flow tested, then dyno tested. Talk about starting a war!!!!
Or, 3 sets of heads, different casting #s, all CNC ported, all from the same company. That would be the best test of the dif in the castings.
CNC is the way to go. Takes the individuality out of it.
Or, 3 sets of heads, different casting #s, all CNC ported, all from the same company. That would be the best test of the dif in the castings.
CNC is the way to go. Takes the individuality out of it.
12-21-2007, 08:00 PM
#33
5.3 heads were milled .015 thats how they got to 60cc's. The ls1 heads were milled close to .015 to i believe and thats how they ended up at 64cc's. As for the ls6 heads i dont know how far they had to mill to get them to 60cc's but it had to be over .015 since usually .005 is about 1 cc or so
12-23-2007, 11:14 AM
#34
I did the same sort of comparo when trying to decide port my stock heads or buy LS6 heads. didnt see enough of any advantage to make me spend the money to go 5.3 or LS6 so I ported my stockers instead. if I was goin to spend money on a new set of cnc ported heads, Id just spend some more on an aftermarket casting instead.
great job though doin all the flow testing for an apples to (sorta) apples comparo.
great job though doin all the flow testing for an apples to (sorta) apples comparo.
12-23-2007, 03:49 PM
#36
TEA's 1.5's 5.3 beat out pretty much all that for 1,599
http://www.totalengineairflow.com/pr.../gmhead/gmls1/
id just go with that
http://www.totalengineairflow.com/pr.../gmhead/gmls1/
id just go with that
02-03-2008, 08:32 PM
#37
well im bringing this thread back from the dead..just flowed another set of ls6 heads
224cc runners 2.02 and 1.57 (advertised as flowing 310cfm @ .600)
........intake....exhaust
.100 65 ....... 55
.200 149 ...... 109
.300 212 ...... 155
.400 261 ...... 185
.500 293 ...... 204
.600 303 ...... 215
224cc runners 2.02 and 1.57 (advertised as flowing 310cfm @ .600)
........intake....exhaust
.100 65 ....... 55
.200 149 ...... 109
.300 212 ...... 155
.400 261 ...... 185
.500 293 ...... 204
.600 303 ...... 215
02-04-2008, 12:18 AM
#40
well im bringing this thread back from the dead..just flowed another set of ls6 heads
224cc runners 2.02 and 1.57 (advertised as flowing 310cfm @ .600)
........intake....exhaust
.100 65 ....... 55
.200 149 ...... 109
.300 212 ...... 155
.400 261 ...... 185
.500 293 ...... 204
.600 303 ...... 215
224cc runners 2.02 and 1.57 (advertised as flowing 310cfm @ .600)
........intake....exhaust
.100 65 ....... 55
.200 149 ...... 109
.300 212 ...... 155
.400 261 ...... 185
.500 293 ...... 204
.600 303 ...... 215
