Finally placed an order for PRC heads
Thread Starter
Joined: Jan 2002
Posts: 4,069
Likes: 74
From: Casselberry FL
Finally placed an order for PRC heads Placed an order with Jon @ Texas Speed this evening. He estimated the whole shebang should ship mid-to-late next week. Great fella to work with and he definitely has patience 
PRC 5.3L heads (222cc intake port, 59cc chamber, 2.02/1.575 valves)
CTS-V racing hydraulic lifters
Cometic .040 MLS gaskets
ARP head bolts
NGK TR6 spark plugs
Anyone know if these heads come with regular PRC Dual springs, or the new PRC Super Duals? They're already closed but I'll contact them anyway.
Also getting the obligatory GM gaskets/seals. Next up is getting my cam specs from Patrick and finding a good deal on QTP race headers. Where might I be able to find some short lengths of flexible exhaust tubing so I can make it to the custom y-pipe fabrication shop without waking the undead?
I'll finally get to use my Comp pushrod length checker. Maybe I'll get lucky and I'll be able to re-use the hardened pushrods I already have (I think they're 7.400"). Also holding off on new injectors as I have the '98 version already, but ready to buy bigger if needed.
I already have a SLP ported oil pump and LS2 water pump. I didn't feel like messing with the stock timing chain. So anything else I'm missing?
PRC 5.3L heads (222cc intake port, 59cc chamber, 2.02/1.575 valves)
CTS-V racing hydraulic lifters
Cometic .040 MLS gaskets
ARP head bolts
NGK TR6 spark plugs
Anyone know if these heads come with regular PRC Dual springs, or the new PRC Super Duals? They're already closed but I'll contact them anyway.
Also getting the obligatory GM gaskets/seals. Next up is getting my cam specs from Patrick and finding a good deal on QTP race headers. Where might I be able to find some short lengths of flexible exhaust tubing so I can make it to the custom y-pipe fabrication shop without waking the undead?
I'll finally get to use my Comp pushrod length checker. Maybe I'll get lucky and I'll be able to re-use the hardened pushrods I already have (I think they're 7.400"). Also holding off on new injectors as I have the '98 version already, but ready to buy bigger if needed.
I already have a SLP ported oil pump and LS2 water pump. I didn't feel like messing with the stock timing chain. So anything else I'm missing?
[QUOTE=I didn't feel like messing with the stock timing chain. So anything else I'm missing?[/QUOTE]
It has to come off anyway, why not spend $20 on a LS2 chain from TSP while your in there. I wouldn't re-use the timing chain after a cam swap, unless its has extremely low miles on it.
And I would say your better off goin ahead & pickin up some Lucas 42lb injectors too. You can get a new set of (8) shipped from HSW for under $300.
It has to come off anyway, why not spend $20 on a LS2 chain from TSP while your in there. I wouldn't re-use the timing chain after a cam swap, unless its has extremely low miles on it.
And I would say your better off goin ahead & pickin up some Lucas 42lb injectors too. You can get a new set of (8) shipped from HSW for under $300.
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Originally Posted by BIG_MIKE2005
It has to come off anyway, why not spend $20 on a LS2 chain from TSP while your in there. I wouldn't re-use the timing chain after a cam swap, unless its has extremely low miles on it.
And I would say your better off goin ahead & pickin up some Lucas 42lb injectors too. You can get a new set of (8) shipped from HSW for under $300.
And I would say your better off goin ahead & pickin up some Lucas 42lb injectors too. You can get a new set of (8) shipped from HSW for under $300.
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I think this far into a build with a good solid H/C combo, not upgrading injectors is a short cut & could come back to bite him in the ***. If he ever goes with more power he will have to come back & mess with it later. Which is more of a hassle than getting them now & having it all tuned at once.
Originally Posted by BIG_MIKE2005
I think this far into a build with a good solid H/C combo, not upgrading injectors is a short cut & could come back to bite him in the ***. If he ever goes with more power he will have to come back & mess with it later. Which is more of a hassle than getting them now & having it all tuned at once.
Thread Starter
Joined: Jan 2002
Posts: 4,069
Likes: 74
From: Casselberry FL
I'll be able to grab my duty cycle as soon as my HPT upgrade arrives. I never paid much heed to it before. Injectors aren't hard to install. If the VE is tuned, just correct the IFR table and it should be pretty close. FWIW, TSP didn't think I needed to worry about it at this time.
If I bought injectors, I was planning on using the SVO 30's. I have no interest in needing enough fuel to require a new pump, etc. Depending upon how this setup pans out, it's likely I won't ever add more power. It won't help me without traction.
If I bought injectors, I was planning on using the SVO 30's. I have no interest in needing enough fuel to require a new pump, etc. Depending upon how this setup pans out, it's likely I won't ever add more power. It won't help me without traction.
one thing to tell these people. jim is an avid autocrosser. so, maximum hp isn't his main goal. overall use able power is what he is looking for. i don't know if jim is wanting to go past the 400 rwhp he has now. when we last talked, it was more to add the low and mid range area. of course, it doesn't hurt to get more top end also.
Thread Starter
Joined: Jan 2002
Posts: 4,069
Likes: 74
From: Casselberry FL
I'll take as much torque as the slicks will handle 
It'd be ironic if I start blowing the tires off in 2nd gear also 
I received my initial cam specs from Patrick. It's a little more aggressive than his Torque cam.
It'd be ironic if I start blowing the tires off in 2nd gear also I received my initial cam specs from Patrick. It's a little more aggressive than his Torque cam.
TECH Senior Member
Joined: Mar 2004
Posts: 14,620
Likes: 17
From: BFE
Originally Posted by john563
agreed thats why I bought mine cuz I have a harris dry kit sitting in my room that will be installed in the spring.When I was just cammed(tr224/112)I put down 350rwhp through an A4 and even with 28lb injectors I was at 80% duty cycle.I bought my Tsp heads and they are going in next wk and the 42lbinj/pump are going in as well.My friend james(gillbot on here) is cammed only and has 28lbinj and is making 399rwhp and his injectors are at 90plus duty cycleJust something to think about, although I see alot of people do heads cam on 28lb inj.most upgrade to 30lb head and cam,but for the price and gonna add a dry kit I went straight for the 42
1st thing to test is the pressure at rail at wot to determine if the injectors are getting enough fuel to deliver their capacity range.
An adjustable FPR @ rail is the "first" mod that should be done IMO.
Pressure drop at wot can be as much as 5 psi which will reduce the capacity handling of the injector.
Thread Starter
Joined: Jan 2002
Posts: 4,069
Likes: 74
From: Casselberry FL
I need to dig up the post, but I'm confused on shimming the springs. I've been advised to shim the springs to within .050 of coil bind, and I'm not sure if that's the same as how TSP has them installed already. Do I need to re-shim them and/or check them? If so, what's the procedure?
Edit: Here is the post:
Edit: Here is the post:
The heads were built & setup for the guys here @ TSP. They are all set up exactly the same thanks to the cnc seat & guide machine.
The heads ship with 2.023" intake valve height & 2.027" exhaust valve height. As a result we set them up with a .020" thicker shim to keep the spring kit setup correctly
The heads ship with 2.023" intake valve height & 2.027" exhaust valve height. As a result we set them up with a .020" thicker shim to keep the spring kit setup correctly