View Poll Results: Which Heads to go with
TSP's 2.5 Ls6 Head
22
40.74%
TSP's 2.5 5.3 Head
21
38.89%
Big Name head I.E. Afr, Dart, Trick Flow
11
20.37%
Voters: 54. You may not vote on this poll
Tsp's Stg 2.5 Ls6's vs Tsp's Stg 2.5 5.3's
06-12-2007, 01:42 PM
#1
Tsp's Stg 2.5 Ls6's vs Tsp's Stg 2.5 5.3's I'm torn between the two.... I called tsp and they said they are both good heads and the 5.3 will higher the compression a little... but which head will flow the best? I'm going to be running the F14 on low lift on a 112lsa, i'm looking for 450 rwhp with heads and cam... it is a 6sp car so that will help out i tiny bit... will i be able to get those kind of numbers out of these heads with that cam? if not which head would get that kind of rwhp? I already have pretty much every bolt on you could think of besides a fast 90/90... i will move to that someday just not soon...
06-12-2007, 03:51 PM
#2
Both are good.....LS6's are a little better to begin with and probably a better choice. If you want the higher compression that the 5.3's offer, just have the LS6's milled a bit.
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06-12-2007, 07:55 PM
#8
right now i'm in the 350 ish... without my underdrive pulley on... i know everyone is going say you rearend is going to go boom... but i'll worry about that once it does... i have long tubes, true duals, ls6 intake, ported throttle body, descreen maf, lid... parts to add on here soon pulley, F14, and a nice set of heads.... i also have a 125 shot on the car just haven't run it yet....
06-12-2007, 09:47 PM
#9
Originally Posted by Emoney97ss
i also have a 125 shot on the car just haven't run it yet....
I am NO expert, however Im researching this exact samething, as it seems to be pretty popular lately. I personally would think that IF you went with 5.3 heads, you'd really want to invest in the timing tuner or something thats gunna pull enough timing(for WOT n2o passes) but only when u need it. Also you adding in extra exhaust gases so if the 5.3 heads only flow so much at your cam's peak lift it'll be opening up the exhaust valve suffient enough for the the n2o to escape yet will immediately be bottlenecking in the heads because of their "limited" capabilites. However if you decide against the n20 the 5.3 heads would give you that (correct me if im wrong) 10.75:1 cr and with the optimum cam make a nasty N/A combo. Their in lies (sp?) the convinence of the stage 1, 2 or 2.5 LS6 PRC heads. You don't get that extra compression (although TSP can/will mill them for you, but again you might have to pull a tiny bit more timing, maybe not as much with 5.3 heads but possibly so a little more than normal) but you get a head that'll breathe with ease, especially when you spray. Or you could get stage 1, 2 or 2.5 LS6 heads (unmilled) and just run a thinner head gasket and maybe gain A LITTLE more on your CR and not have to pull as much timing as you would with a LS6 stage 1, 2 or 2.5 (??) Again Im NO expert and will probably be told to
but thats life, live and learn Best of luck
06-13-2007, 12:26 AM
#10
damn i never thought of that and never mentioned it to tsp that i would be running nitrous on the car... i want the badass n/a combo possible before i drop some nitrous on it... then when it goes on top of that i want a badass street car!!! but guess that's what everyone wants....
06-13-2007, 07:03 PM
#11
I had a TV2 on a 112 with stock heads and was making 350 RWHP thru a 3400 stall. I bought a set of Stage 1 PRCs and it put 50 more hp to the tires. I don't run NOS so I can't help you there but this combo use to run 12.01 at 114mph na.
Last edited by NC98Z; 06-13-2007 at 07:06 PM. Reason: fix
07-04-2007, 04:14 PM
#12
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I am in the same predicament (except no spray). I believe I will go with the 5.3L stage 2.5 heads because of the greater compression. TSP also said they have better PTV clearance usually with more aggressive cams than the LS6 heads. They are easier on the wallet too
09-26-2007, 02:40 PM
#14
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According to TSP's website, the 5.3's flow slightly better in addition to raising compression. I am torn as well but am leaning towards the 5.3's if they flow according to TSP's site
09-26-2007, 06:13 PM
#15
i ended up getting the 5.3's milled .030 i got them used so now i just hope they clear my f14 cam... i had another place go back through and port them some more, i wasn't empressed with the porting job done with the heads at all... don't get me wrong you can tell they were ported but it doesn't look like someone spent a lot of time porting them... if thats the 2.5 on a scale to 3 it has no place being called a 2.5...
09-26-2007, 09:34 PM
#16
Well I really like the Futrals cams and when I talk to him a few months ago back he suggested the Darts but I already have the stock set of LS6 not ported and in the next few months I am going to replasce them with the Darts but I know everyone says out of the box that they need some port work and I dont know what company out there has found what to do to them. I have the F13 from Futral and made 427rwhp with the LS6 intake and MTI throttle body. Good Luck
