best heads for vz ss 5.7L

[brendanssz]

hi all just looking into some more bolt on mods for my ute and heads seem like
a good upgrade as ive done most of the other bolt on mods. just keen to know what
brands people use and recommend and what size? like higgins, dart etc and what type of
gains would you see? some say 20hp some say less.

its a vz ss ute 5.7l manual 6 speed
current mods.
high flow fuel rails with 42pound injectors
throttle bodies australia 92mm electronic aftermarket throttlebody
fast intake manifold 92mm
aluminium otr
isky gold valve springs
isky 224-230 cam
conrod bolts
25% underdrive pulley
msd ignitin leeds
di filipo stainless 1 7/8 4into1 headers with 3 inch 100 cell cats and
twin stainless 3 inch
npc heavy duty clutch
diff gears
Tein street coilovers

it used to have 1 5/8 pacemaker try y's with 2.5 cats and piping and made 296rwkw
but hasnt been retuned since upgradingto the new exhaust couple of weeks ago.

[brendanssz]

296rwkw with 530nm torque

[white lie]

I'm more interested in why you did the manifold before the heads?
You may not make a heap more peak power but you will gain more thru the whole rev range.

[Antz_clubbyR8]

I am also looking at heads for my Ls & have read a lot of good reports about Ls 3 small bore heads. Means you would have to change intake to suit but could be worth it.

[brendanssz]

did the manifold to match the throttle body in 1 go seeing as i was going to have to get
an adaptor plate to fit the throttle to the standard intake so thought kill two with 1 stone
n upgrade the manifold because it was going to get done
at 1 stage anyway. wanted to do the simple stuff first.

[brendanssz]

ahk nah i like my current setup so probly just stick around the ls1/ls6 area
just not sure wether to go to hassle of sending my heads off to be ported or buy
new 1s and bolt em straight on.

[offshore]

could get exchange ones from Higgins you might get to 320kw

[black_friday]

Mate if you've got the cash to spend on heads for only a small gain, Id consider a small blower setup if you're really keen on more power. Sell a few parts to recover costs + some cash and you're over 400kw. Heads are gonna set you back somewhere between 1-2k, is it worth it for 20hp? Your 1 7/8s will suit at least!

It all depends what your end goal is for the car. I used to have a vl back in the day and guys used to spend all this money getting power out of N/A motors, at the end of the day if you want power you have to stroke it or blow it.

[black_friday]

You could always buy a second hand set and watch a few vids on youtube and have a go yourself:yup:

[brendanssz]

yea heads might set me back 1 to 2k but a blower will set me back
$8000 then ill have to go through hassle of changing/selling pulley and
harmonic balancer, intake manifold, injectors, otr, possibly cam then have to spend at
least another $2000 on getting it up to scratch again. plus i like it being N/A and when
u consider that a brand new 20hp outboard motor costs $4700 then even if i only make
10hp for $2000 with the possibilty of making up to 20hp its not bad price. and its an
easy bolt on mod that cops wont hassle me over.

[brendanssz]

im just aiming to keep it n/a with nice simple mods is all im after. its only done 79,000km so i
might stroke it once its well over 100,000km.
its my first car i bought it brand new in 2005 3 days before christmas
when i was 18 so i want it to last a long time

[blackvussii]

Pete out at Horsepower Engineering at Capalaba does some really nice heads if your looking to get yours done. I'd maybe try and find some 243s and either way get them decked for some more compression as well.

[white lie]

Oh dear.... how did a thread go from buying high quality heads and spending around 2 grand to a 10 grand blow out on boost or worse, porting your own heads?

As said, get exchange from Higgins or Mast, AFR, dart, PRC etc from the states.

[brendanssz]

ok awesome cheers capalaba only just down the road from me so nice n close

[brendanssz]

haha yea i dunno hey but its all good i think every1 loves chargers but
when it comes down to how much u have and want to spend i guess its
just not that easy to say charge it.

[black_friday]

Hey I didnt mean to stir shit whitelie, if you can get changeover heads for a good price go for it. I just cant see the point in spending that kind of money on a streeter for a 20 hp gain. Seems like he has done the main bang for your buck mods already, if he still feel he needs more power I'd consider charging it.

[white lie]

All good mate :)
Like I said before, it may only be 20hp up top but it will make a lot more under the curve. Low down torque will increase. And as I illuded to before, would have been better bang for buck than the intake manifold

[munz]

Hey Brendan,

Who installed your rod bolts? And who tuned it

[brendanssz]

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