Thinking about a change...help me decide
11-05-2017, 09:00 AM
#1
Thinking about a change...help me decide
Current setup
TMS LQ9, CNC 317s, NNBS intake, 226/232 cam @ 115, 1 3/4 headers, 60e with 3800 stall and 4.10s.
I'm thinking about a change to ls3 heads with the square port truck intake. I know there is a concern with the large intake valve on the ls3 head causing arousing issues but are the gains worth it with a proper spec'd cam?
I'd probably get the GM CNC heads and change the springs.
Thoughts?
TMS LQ9, CNC 317s, NNBS intake, 226/232 cam @ 115, 1 3/4 headers, 60e with 3800 stall and 4.10s.
I'm thinking about a change to ls3 heads with the square port truck intake. I know there is a concern with the large intake valve on the ls3 head causing arousing issues but are the gains worth it with a proper spec'd cam?
I'd probably get the GM CNC heads and change the springs.
Thoughts?
11-05-2017, 09:20 AM
#2
Current setup
TMS LQ9, CNC 317s, NNBS intake, 226/232 cam @ 115, 1 3/4 headers, 60e with 3800 stall and 4.10s.
I'm thinking about a change to ls3 heads with the square port truck intake. I know there is a concern with the large intake valve on the ls3 head causing arousing issues but are the gains worth it with a proper spec'd cam?
I'd probably get the GM CNC heads and change the springs.
Thoughts?
TMS LQ9, CNC 317s, NNBS intake, 226/232 cam @ 115, 1 3/4 headers, 60e with 3800 stall and 4.10s.
I'm thinking about a change to ls3 heads with the square port truck intake. I know there is a concern with the large intake valve on the ls3 head causing arousing issues but are the gains worth it with a proper spec'd cam?
I'd probably get the GM CNC heads and change the springs.
Thoughts?
11-06-2017, 01:15 PM
#4
I don't think you'd gain much with the LS3 heads vs your CNC'd 317's
Cathedral head shine down low - LS3's heads are turds down low. If you do go that route you might be able to offset the loss down low with a higher stall converter. Square ports do really well up top.
Do some research to compare your CNC 317's to the GM perf LS3 heads - I remember a while back I did a ton of web searches for dyno charts and comparisons - so I know the info is out there. Then you can make an informed decision.
Cathedral head shine down low - LS3's heads are turds down low. If you do go that route you might be able to offset the loss down low with a higher stall converter. Square ports do really well up top.
Do some research to compare your CNC 317's to the GM perf LS3 heads - I remember a while back I did a ton of web searches for dyno charts and comparisons - so I know the info is out there. Then you can make an informed decision.
11-06-2017, 03:39 PM
#5
I can't say I think it will be worth a whole ton of HP either honestly. If you were on stock heads that would be another story completely. I dont know much about the TMS heads though. There can be a wide range of performance from one CNC head to another. Could you tell us about them? Valve size? Chamber volume? Runner volume? Did he relay any flow numbers? Flow numbers are next to impossible to compare unless they are literally done back to back... but its data none the less.
11-07-2017, 01:53 PM
#7
I can't say I think it will be worth a whole ton of HP either honestly. If you were on stock heads that would be another story completely. I dont know much about the TMS heads though. There can be a wide range of performance from one CNC head to another. Could you tell us about them? Valve size? Chamber volume? Runner volume? Did he relay any flow numbers? Flow numbers are next to impossible to compare unless they are literally done back to back... but its data none the less.
I've also contemplated a cam change to move from a 115lsa to a 110-112lsa.
Just some ideas I'm throwing around.
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11-07-2017, 03:28 PM
#9
I mean at this point if you are looking for a drastic change in power you either need to make major changes to the drivability of the truck with a looser converter, or you need to go back to FI.
If you wanted to shake things up while staying NA I would say more duration on a narrower LSA would certainly help.
Maybe something closer to a 228/234 112+3
If you were willing to go for serious chop 230/236 111+3
If you wanted to shake things up while staying NA I would say more duration on a narrower LSA would certainly help.
Maybe something closer to a 228/234 112+3
If you were willing to go for serious chop 230/236 111+3
11-07-2017, 04:17 PM
#10
I mean at this point if you are looking for a drastic change in power you either need to make major changes to the drivability of the truck with a looser converter, or you need to go back to FI.
If you wanted to shake things up while staying NA I would say more duration on a narrower LSA would certainly help.
Maybe something closer to a 228/234 112+3
If you were willing to go for serious chop 230/236 111+3
If you wanted to shake things up while staying NA I would say more duration on a narrower LSA would certainly help.
Maybe something closer to a 228/234 112+3
If you were willing to go for serious chop 230/236 111+3
I don't mind the chop. I had a Mustang 3v about 6 yrs ago that sounded like it was chopping trees. Lol
Thanks for the insight.