NW Iowa WS6

iTrader: (9)

Dyno sheet shows before of tuned "cam only" and after the addition of PRC 5.3 63cc heads and Harland Sharp 1.7 roller rockers.
Mods are in my sig but here are the biggies:
-6speed with 3.5" alum driveshaft & 4.11 35spline 9" rear, spec 3+ clutch/steel flywheel
-232/236 .625"/.625" 112+4 cam
-TPIS 90mm LS6 intake and throttle body
-TSP 1 3/4 headers/ORY/catback
-SLP 25% UD pulley
-SLP lid with maf deleted, speed density E85 tune on both "cam only" and "Heads cam" runs.

I'm still in shock about the torque on this mild 10.7:1 346". You'd think from this sheet it's got really milled heads or slightly stroked. With a 10bolt i'd be near 460/440 i'm guessing.

NW Iowa WS6

iTrader: (9)

Took it to the track last night right after the dyno but the air was a swampy 3300DA. I only did 11.91@116.0 with a 1.65 60' 3550 race weight. My best on the cam only was 11.85@116.7 in 1400DA and a wicked 25-30mph tailwind.

HCI2000SS

iTrader: (2)

Very nice gain...and especially on a 63cc! I have the same heads on a 61cc, but with a bigger cam on a LQ9, and love it! The before and after was on the same dyno right?

mac62989

iTrader: (1)

Nice numbers! How do you like that TPIS piece?

NW Iowa WS6

iTrader: (9)

Same dyno same tuner both e85 speed density. the TPIS is nice but I'd go Fast 92 or 102 over it, I just got this combo for $700 used. When I did the intake while I was cam only it picked up 17whp over the stock LS6 and tb, so that probably helped these heads shine now too.

john563

iTrader: (17)

i have the same heads and gained 40rwhp with it..A4

MikeWS6

Mine gained 48/21 w/ those heads.

NW Iowa WS6

iTrader: (9)

^nice, nearly 50, these are by far the best money:hp heads out there, you see some $2500 trickflows not even gain what these do.

john563

iTrader: (17)

yes it is..i gained 40rwhp in a big stall A4 if it was a stick could be more..you really cant beat the heads for the price..last i dyno was 435rwhp 407rwt..and that was with hooker(ypipe shitty). iahve since added a mufflex y and merge 4inch dumped dynomax bullet..so im sure its in 440's range..not bad for budget heads in an A4

tigertales

Is this gain over the stock 241 LS1 heads?

NW Iowa WS6

iTrader: (9)

Close, the motor is a 5.3 bored to 5.7 and uses stock LS1 pistons. So the heads were actually 61.5cc 706 castings but had stainless 2.02/1.57 valves installed. So heads flowed about identical to 241's but 10.8:1 compression. I actually slightly lost compression doing this head swap but TSP reccomended no milling with my cam when I called them.

speedtigger

iTrader: (16)

I have the PRC 243 Stage 1s and I think these heads are very under estimated by people on tech. I think they are one of the best buys out there.

john563

iTrader: (17)

this ^

NW Iowa WS6

iTrader: (9)

I was torn between the stage 1 243's and the stage 2.5 5.3's I got, came down to money, I needed the dual spring kit and that put the 5.3's with apples to apples flow numbers $200 cheaper

td1168

iTrader: (2)

I put these same heads on my build in the spring. They are the only thing I changed along with an increase in compression to 10.75:1. I'm going to pick my car up from the tuner tomorrow. The car made 380rwhp and 370rwtq when he dyno'ed it on his mustang dyno before the heads.

HCI2000SS

iTrader: (2)

These heads along with a healthy cam and a stock LS6 intake have made me a dead nuts race with my buddy's ported/pullied 03 Cobra with 3.73's and 150 lbs of weight reduction! So, for the money (and with the right setup) they can make for a very fast ride

NW Iowa WS6

iTrader: (9)

I've had the same results, our track is generally higher DA and I mph the same as 470-500whp cobras, newer gt500s, and ZL1's

jaywill

iTrader: (5)

good info...

5.3parts

awesome gain