prc 2.5 ls6
prc 2.5 ls6 I have a set of prc ls6 2.5 heads with 2.02 and 1.57 valves .650 double springs that I plan on putting on my 04 gto. Stock bore motor. I would like to mill the heads to 62cc and run the stock gm gasket. I also plan on doing cam at the same time but not sure what to go with as I dont want to deal with ptv problems. Car is m6, dynatech headers high flow cats, slp exhaust 2.5 exhaust with X, underdrive pulley, and port tb as of now. At later date probly do the 90/90. I am looking for gobs of torq as the car is heavy and would like to be around 400 to 430 hp to the wheels.
So my questions would be can I mill my heads to 62cc to get 11:1 compession without ptv problems?
Also what would be a good cam choice for my hp goal? Car is a summer dd and some strip use on the weekends. Not worried about a little lope!
tsp 228r range? or custom?
Just looking for some help and a direction to go in as I am sick of searching and reading!! Thanks for enyones help
So my questions would be can I mill my heads to 62cc to get 11:1 compession without ptv problems?
Also what would be a good cam choice for my hp goal? Car is a summer dd and some strip use on the weekends. Not worried about a little lope!
tsp 228r range? or custom?
Just looking for some help and a direction to go in as I am sick of searching and reading!! Thanks for enyones help
I know its not the same, but my buddy who has a tsp 228r on his TA with a 125 shot through a midwest 9" ran a 12.1 on the 1/4. Keep in mind where i am located our DA is regularly in the 7000-8000 range /cry. His setup is cam only with bolt ons and spray, you'd have the advantage of the ported heads.
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From: BFE
A 228 cam would be perfect, take a look at the Streetsweeper HT
Before you mill, measure your chambers that way you'll know exactly how much to take off. Should not be too much at all. Probably like .010>.012
Before you mill, measure your chambers that way you'll know exactly how much to take off. Should not be too much at all. Probably like .010>.012
yep already mesured and got a little over 64cc so about right for stock .012 or so should get me to 62cc just don't want to end up with problems, so with that cam area I should not have a prob or should I do full custom spec and get correct ve's maybe that cam does but that is a little above my head, not trying to be dumb just want to do it right the first time and improve from there
Last edited by 04qsm-m6; Sep 7, 2009 at 10:34 AM.
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From: BFE
228/232 111 LSA, perfect for 11:1 346ci.
I have a similar grind that is a 227/231 111LSA (just diferent lobes),
I have a similar grind that is a 227/231 111LSA (just diferent lobes),
Last edited by 98Aggie; Sep 7, 2009 at 12:30 PM. Reason: non-sponsor info removed
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Pred he said he'd like gobs of tq....I was just looking at your last post pred with your reverse split 230/228 cam and that thing makes TORQUE! Why not spec this cam out to him? Just curious is the 228/232 VE's close to the reverse split? I know you and Ed's grinds are very similar so I didn't want to leave his name out either.
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Give me a call Tuesday morning & I can help you find out how much milling was done to your heads & p/v requirements so you know where you can go camshaft wise.
We have a new 229/234 camshaft built with TSP intake lobes on a 111 LSA. I can provide you with side by side dyno graphs comparing it to other options.
Let me know if we can help you out!
We have a new 229/234 camshaft built with TSP intake lobes on a 111 LSA. I can provide you with side by side dyno graphs comparing it to other options.
Let me know if we can help you out!
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I'm about to put some PRC LS6's to the test w/ my 228/232 cam. We're cutting .020, and I'll post how much clearance is available after it's measured.
I'll be calling you soon Matt. Waiting on the guy to drop the car off.
I'll be calling you soon Matt. Waiting on the guy to drop the car off.
228/232 111 LSA, perfect for 11:1 346ci.
I have a similar grind that is a 227/231 111LSA (just diferent lobes),
I have a similar grind that is a 227/231 111LSA (just diferent lobes),
We have a new 229/234 camshaft built with TSP intake lobes on a 111 LSA
I'm about to put some PRC LS6's to the test w/ my 228/232 cam. We're cutting .020, and I'll post how much clearance is available after it's measured.
I'll be calling you soon Matt. Waiting on the guy to drop the car off
I'll be calling you soon Matt. Waiting on the guy to drop the car off
TECH Senior Member
Joined: Mar 2004
Posts: 14,620
Likes: 17
From: BFE
Pred he said he'd like gobs of tq....I was just looking at your last post pred with your reverse split 230/228 cam and that thing makes TORQUE! Why not spec this cam out to him? Just curious is the 228/232 VE's close to the reverse split? I know you and Ed's grinds are very similar so I didn't want to leave his name out either.
The 228/232 range will be very similar, just different in trq curve shape.
My 227/231 is on LSL Comp Lobes.
The 230/228 is only good in dual exhaust situations, either on F-body or Corvette. It is just the nature of the beast, and that is what it likes best (Or a Y with open cutout)
How are them LSL lobes, are they easier on springs? Thats what I thought I read some where.
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Joined: Mar 2004
Posts: 14,620
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From: BFE
No, if you have true duals it will work. they are all similar cams, the reverse makes a slightly different trq curve. Both will work well in your car.
The 230/228 would not accept mill though, you would have to run it with your heads as is and stock GM gaskets. Actual grind comes out like 232/228.x so it is slightly bigger.
LSL are fine with those springs. The 230/228 is XFI/XER
This is the 230/228 in 2 diferent cars cam only:
1 pic> C5 346 (410Hp/387tq). M6
2 pic> Z28 LQ9 6.0 (398Hp/395tq), A4
3 pic> same C5 with Cartek 243 heads and 90/90 unported 464hp/427tq), M6
The characteristic of this grind is the trq output from 3000 rpm and the fact that it does not die after peak as most reverse do. So it carries a high average hp/trq ratio.
The 230/228 would not accept mill though, you would have to run it with your heads as is and stock GM gaskets. Actual grind comes out like 232/228.x so it is slightly bigger.
LSL are fine with those springs. The 230/228 is XFI/XER
This is the 230/228 in 2 diferent cars cam only:
1 pic> C5 346 (410Hp/387tq). M6
2 pic> Z28 LQ9 6.0 (398Hp/395tq), A4
3 pic> same C5 with Cartek 243 heads and 90/90 unported 464hp/427tq), M6
The characteristic of this grind is the trq output from 3000 rpm and the fact that it does not die after peak as most reverse do. So it carries a high average hp/trq ratio.
Last edited by PREDATOR-Z; Sep 8, 2009 at 05:52 PM.
I'm about to put some PRC LS6's to the test w/ my 228/232 cam. We're cutting .020, and I'll post how much clearance is available after it's measured
Not yet. He just dropped the car off yesterday. Car is getting a twin disk clutch, custom seat brackets fab'd up for racing seats (04 GTO), other "weight loss" mods, and a few other odds & ends before the heads are ordered. Should have it together within the next 2 weeks.
Sounds like a race only 04!! I plan on doing a clutch after heads and cam, also stepping up to the new tick clutch master for the gto. Can't wait for some results from you combo. Is the cam you are going to be installing your own spec? Might have to call TSP see what the have for suggestions in the cam department, but I think I know the right direction to head in 228/232 duration range.
