I took off my intake manifold today (planning to fit EFI to the new car) and what I saw was a several mm wide gap between intake manifold and the heads. I always knew the stock porting sucked but I never even thought it sucked that bad. How much good would it do to port match the manifold and head (using the gasket as template for hole size)? No wonder theres only 155bhp from that carburated V8...

hello mate sounds like u should be porting it as we speak mate, get some vitsse heads on there and efi it mate she go like a rocket!!

Best way to make easy power is to fit std 4,6 heads.. They are best for rover casting.. Ports are bigger and better flowing that any Vitesse heads.
You can get over 200hp easily with 3,5efi with 4,6 heads.. Slightly leaning in ports then you get say220hp inc std vitesse cam..

I speak with my own experience guys..

Hi,

Do the 4.6 heads bolt straight onto the 3.5 block? Are all the studs in the same location?

What compression should be run? Do I need to change the pistons for this conversion?

regards

Jolyon

your be fine with 4.6 they are the same patter apart from the 4.6 heads are 10 bolt and not 14 bolt mate so less bolts to toque down lol!!! u wont have to do anything to the bottom end mate just starp them on good luck

Ok, do I need to change the rocker covers?
Do I have to use the 4.6 gasket...correct?

This is good information.

regards,

Jolyon

You can use 4,6 heads and rockers + etc..
But if you use std steel head gasket wit 3,5engine with 9,35:1 pistons then you get near/over 10:1 compression ratio. + Then you must to measure lifters preload and also fit some shims under rocker shaft mounting, because rockers geometry is not correckt (i think) if use steel gasket..??
2 option is to fit composite head gasket.. Then you only must to adjust preload.. and your cr is 9,35 then..

Composite head gasket thickness is 1,2mm and steel ones is 0,5mm?
4,6head combustion chambers is 28cc and 3,5-3,9-4,2 is 36cc

Someone (Englishman) can explain this better if you don´t understand..

Are these 4.6's?

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They are listed as such, but I am dubious

Thx,

I'm looking hard.

So basically some 4.6 Range Rover heards and fit them with a composite gasket and we are good to go. Should go well with the Hotwire Injection I just bought

your right mate only rangerover 1s will do as for the head gaskets its up to u mate i fit was mine i would tin head gaskets on but for the long run i would put composite 1s on just to make shore, hotwire is the best mate i doing it to my 4.6 keep looking mate!!

v8man no offence, but your post is nearly unreadable. Really hard to follow what the heck your saying due to all the typos' specifically

" i fit was mine i would tin head gaskets"

thats ok mate sorry i type to first sorry, i said if it was mine i would put normal head gaskets back on but its up to you, so sorry for the way i type

Got ya,

that would turn the engine into HI Compression according to Rimmers site.

thats it you got it that would give you some more bhp mate my dad done that to a s1 a normal 9.35.1 and had the heads skimmed to the max they would go and had a comprisson of about 11.5.1 sounded like a tractor and go like something i have never seen trust me!