Alloytec heads on a ecotec bottomend
Hi guys I have just bought my first holden after having many many great fords.....lol I have a VT Spack 5speed and i'm pretty happy with it. i have replaced alot of parts like the heater core and exhaust and other things like that... now getting back to the point that I want some power.. I have got some parts already
Pacmakers and a 2.5" exhaust
lightened flywheel and clutch kit from exedy
Ported T/B
can the Alloytec heads bolt on to a ecotec bottom???
NOW I would like to do 3:5 diff gears and a LSD
I need to replace the head gaskets so was also thinking of getting 15thou taken off and getting the ACL 1mm thinner head gasket
I would like to do a stage 2 cam and chip but would also think about the 1.98 rolla rockers
and is there any difference with the air boxs and pipes between the V6 and SS or any other models out there??
I just want to do some small things like that just to give it abit more go if I don't do any of that I will just supercharge it with the 1.98 rolla rocker and the 11psi pully upgrade... but keep in mind its just got the Getrag gearbox... any pointers and help would be awsome.......
the holden mechanic
Donating Member
The heads are not interchangable. Plus on the ecotec, the spark plugs are located in the side of the heads, with the alloytec, they are located in the top of the head. Ecotecs use Spark Plug leads and coils, Alloytecs just use coils. But mainly they wont fit different engine completely.
Whats with people starting to ask questions about Alloytec engines/heads in pre-VZ Commodores?
Originally Posted by Jasper44
Including car parts (VS, VT, VX, VY, WH etc), my WH Statesman, and other things listed on eBay.
lol
this thread takes the cake
Donati..Whoa Green
Five cams for that awesome hecticness.
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ok so i cant put the alloy tec heads wont fit on the ecotec bottom end so what is every ones thought on the rest????? thanks TonyJZX for all you help and wise words u fuc head... I don't know any thing about holdens this is Y i ask....
Donating Member
Sad to see how many need to ridicule those whom dare to ask questions.
As a direct bolt on, No, they wont fit, I haven't had a set of each heads next to each other to compare how differently all the water jackets and ports etc line up. If you have a set laying around, compare them and ask a machining/engineering shop if it's remotely possible if most of it lines up. Mind you, the cost would make it not worth doing seeing as you'll gain very little per $.
All your little mods aren't really worth doing if you can hold off for a little longer and then put the blower on it.
LSD and better ratio to suit your driving is always worth doing.
Forced induction prefers a lower compression setup than a higher compression setup so supercharging it after decking the heads would be a stupid thing to do. Same as thinner gasket, you want better gaskets to handle forced induction not thinner.
So bang for buck, forced induction. If not, the above mods bit by bit will be counter productive to what you want to have in place if you supercharge it later.
Roller rockers are always worth having.
Cam choice should be mated to a firm decision now whether you're putting the blower on or not. No point doing a stage 2 cam now and then finding it doesn't like being combined with a blower. Choose a cam suited to your application, or wind up doing the cam again later.
You wont achieve as much with the little mods as you would with the blower, but some of your mods aren't a wise choice to have done if you do supercharge it later.
Your freedom ends where mine begins
I think the stand out reason would be that Alloytec are OHC and ecotec is single cam.
In a practical sense, it's completely impossible.
So the two of you where born with all your car knowledge? Never had to learn through asking a stupid question or two?
If I were you, I'd get a 2nd hand set of heads in good condition, and then build them up to spec, to handle your supercharger if/when you get it. Then you can port/polish them, get them machined, valve job etc and then when it's time to supercharge, take the other heads off(and rebuild them, so you have a spare just in case lol), put the new ones on, do the gaskets and shit all at the same time. That way you still have a car to drive, instead of having none for the week or so that it'll take to get it all set up and running.
I'm sure there is a way to get the alloytec heads to work on the ecotec, but it'd be a royal pain in the arse, would need a fair amount of stuff added to the VT block to support the head and all the (presumably) different water jackets(would involve a 1" thick piece of steel, with the ports for the vt block on the bottom of it and then mating it to the alloytec at the top with the ports up there, and in between the top and the bottom changing the direction it goes...effectively increasing the displacement of the engine, requiring 2 head gaskets, longer conrods(probably not possible) or higher pistons, etc. Then you'd need a way to get the cams moving in the head...and a way to bolt it to the block and also bolt the head to the adaptor bit and the block...not sure what the cam system is like in it, but you'd probably need a way to get some motion from the crank up to the head to turn the cams...
As you can see, it isn't going to be easy...try it if you dare lol
Donating Member
Not going to be easy? Not going to be possible. Why would you even waste time attempting to try it when it clearly wont work. Read the posts that say what is different like the cams (in the head on the Alloytec, in the block on the ecotec), spark plugs (different locations on the heads), water jackets. Not to mention that the blocks are different. If you have a look at the heads, they are also a different shape, so the inlet manifold wont fit.
If you want to keep the V6, you would be better off going L67, or putting L67 heads/inlet manifold on your ecotec engine (not sure how long it would last).
Including car parts (VS, VT, VX, VY, WH etc), my WH Statesman, and other things listed on eBay.
Take it out/Take it Back
Just to throw this into the mix, before all the haters jump on board....
Why are you sticking with the 6? For the amount of money you're looking to throw at this you could get a 5L or even an LS1 and start the modification process on that. You would come out MILES ahead financially and on a power basis.
Any things possible with enough money. how feel are your pockets?
Would be worth planning what you want to do from the start rather than doing mods you'll then have to remove at a later date.
If you want an alloytec (ohc 6) why not just swap the block as well? Would be much less work.
If we can get man to the moon, I'm sure it will be possible. Impractical, stupidly expensive, but it'd at least be doable. For shits and giggles, of course. You'd end up adding 10kg to the finished weight of the motor and definitely voiding any warranty.
I mean, humans manage to keep human babies alive with no brain(literally)...
Tells it like it is.
Lol - fail thread for something that will never happen. About the only way your going to get an Alloytec head to fit a Ecotec is to melt it down and cast it into the ecotec design.
Reaper
I gave a perfectly workable way to get the heads on, and still at least get compression and the first spark...after that you'll have to hope it doesn't explode.
Then again, why doesn't OP just get an alloytec block with the heads and remove all the hassle? Or sell it and buy a VZ...or use the search feature.
Take it out/Take it Back
This i've got to hear more about...
just get a fuc##n V8 pointless spending on a six !
Yeah let's all buy v8's and do the same mods and be full hectic together
Rofl, be fully sik ####z
I wish I was! But I drive a v6 that I shouldn't modify cause v8's are the only thing worth spending money onRofl, be fully sik ####z
=P
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