well, i may be buying some sort of investment property in the near future, so ive decided im not saving for an evo now, but will continue to mod a car. anyway i have a spare set of heads lying around from my old 3.0L engine, that i would like to do some head work too, and when complete ill swap my current heads with, to minimise the time my car is off the road.
anyway im looking at a full head recodition such as new lifters, as i remember them being a little noisy, and i want new cams, nothing too wild, with stiffer valve springs, thats all i have planned
deshrouding? or will that just make me loose some compression since im keeping the pistons stock atm. worth while shaving the heads to get a little more compression? what cost am i looking at? ill try to do as much as possible

well, i may be buying some sort of investment property in the near future, so ive decided im not saving for an evo now, but will continue to mod a car. anyway i have a spare set of heads lying around from my old 3.0L engine, that i would like to do some head work too, and when complete ill swap my current heads with, to minimise the time my car is off the road.
anyway im looking at a full head recodition such as new lifters, as i remember them being a little noisy, and i want new cams, nothing too wild, with stiffer valve springs, thats all i have planned
deshrouding? or will that just make me loose some compression since im keeping the pistons stock atm. worth while shaving the heads to get a little more compression? what cost am i looking at? ill try to do as much as possible

if your running 9.0:1 shave max .20thou off the heads, would bring it up to around 9.1 - 9.2:1. cams work on about $900, springs around $400, port an polish with shave of heads around$800-$900. Min cost $2200 give or take

if your running 9.0:1 shave max .20thou off the heads, would bring it up to around 9.1 - 9.2:1. cams work on about $900, springs around $400, port an polish with shave of heads around$800-$900. Min cost $2200 give or take

Wouln't it be cheaper to get Ralliart heads? They're only around the $600, I think?

hard to find, you got any forsale?

isnt only different between standard an ralliart heads is the cams?

no they had some minor porting done to the heads, and then stiffer valve springs to match the cams.

hard to find, you got any forsale?


As far as I know, they can be got from Mitsubishi direct. Give your local spares dept a call & see what you can come up with.

i dont plan on goin to mine, they are soooo expensive than others, they wanted $70 for a friggen thermostat

Off topic but magna thermostats are really expensive.

i dont plan on goin to mine, they are soooo expensive than others, they wanted $70 for a friggen thermostat

as ben TH said, thats not bad for one genuine.
Ralliart heads also had some deshrouding of the valves done, so they would be a worthwhile and relativly cheap upgrade.

Wouln't it be cheaper to get Ralliart heads? They're only around the $600, I think?

Ralliart heads are a waste of money if you are getting them for more performance. If you do a search you will find the flow figures Graham recorded for stock heads, Ralliart and 380. Ralliart actually lost a bit of flow at higher lifts but gained a bit at low lifts. Plus the chambers are bigger and lower the comp ratio 0.25 with stock 3.5 pistons. However if you are getting the Ralliarts for unworn valve guides, unworn valve seats etc then they are OK.


no they had some minor porting done to the heads, and then stiffer valve springs to match the cams.

No, they straight flycut the combustion chamber 2mm I think Graham told me around the inlet and ex valves. A really horrible job. An angle flycut would have been no more expense and while not great would have been much better.

The Ralliart springs are stock spring tension but nitrided for durability.

Cheers,
Alan

I would choose a second hand 380 (6G75) and use your engine for the conversion parts. Just my opinion, power per dollar, with a better future development potential.

Cheers Dave

No, they straight flycut the combustion chamber 2mm I think Graham told me around the inlet and ex valves. A really horrible job. An angle flycut would have been no more expense and while not great would have been much better.

The Ralliart springs are stock spring tension but nitrided for durability.

Cheers,
Alan

ah i ment deshouding, and yes they were nitrided, perhaps i was thinking of somthing else.

port an polish with shave of heads around$800-$900.

Generally good headwork from someone who really knows what they are doing is gonna cost much more than that. More like $2000-2500 for a reco, port and flow testing. At least thats the sort of figures the guys who are known widely to be really good are charging for the sort of work we are talking about.

Personally, I'm very skeptical of anyone who charges $800-900 for work on a pair of multivalve V6 heads, unless it's "mate's rates". Not to say it's necessarily impossible to get a half-decent job for $800-900, but IMO it's probably going to be a big gamble at that kind of price point.

Unless you can DIY, have access to cheap parts/labour etc, I think you'll find forced induction is more cost effective for getting a large power/performance increase.

most likely i will now, remove the spare heads myself, get set of cams+springs, (possibly Graham bells) put in new lifters, (i hear that mitsu has made a revised version to help stop them getting noisy in the future) and hopefully that is all that needs replacing, mind you those heads have done, 280,000kms and get the heads skimed to increase compresssion a little. remove the curent heads myself to save on labour cost, and get a mobile mechanic to install everything, and i can install the rocker covers, engine acc's and intake plenum ect.

most likely i will now, remove the spare heads myself, get set of cams+springs, (possibly Graham bells) put in new lifters, (i hear that mitsu has made a revised version to help stop them getting noisy in the future) and hopefully that is all that needs replacing, mind you those heads have done, 280,000kms and get the heads skimed to increase compresssion a little. remove the curent heads myself to save on labour cost, and get a mobile mechanic to install everything, and i can install the rocker covers, engine acc's and intake plenum ect.

I know with the 3000GT's the 99 models got 3mm bores in the lifters compared to 91-98 models which got 1mm bores in the lifters
http://www.3sx.com/store/catalog/lash-adjusters-newer-6-400.jpg

Hey, would these* fit in our SOHC 6G74's?

http://cgi.ebay.com/ebaymotors/94-96-Mitsubishi-Montero-3-5-6G74-Lifters-Lash-Adjuster_W0QQcmdZViewItemQQhashZitem5635c30d13QQit emZ370269162771QQptZMotorsQ5fCarQ5fTruckQ5fPartsQ5 fAccessories

I'm pretty sure the montero's are all DOHC, but do you reckon they'd fit straight in?

If someone can get a picture up of a SOHC one we can compare?

SOHC cam lifters.

http://img691.imageshack.us/img691/4757/image0018.jpg
http://img203.imageshack.us/img203/5051/image0022x.jpg

I got mine from eBay USA, about half the price they wanted locally.

Lifters are easy to tell apart, the DOHC lifters are about twice as long.

No they won't fit. They are completely different, the SOHC has a small lifter in the end of the rocker arm pushing on the valve tip. The DOHC has the lifter at the other end of the rocker sitting in the cylinder head with the camm sitting on top off the rocker between the valve and the lifter.
The lifters in the SOHC last well if you stick to regular oil and filter changes.

Cheers Dave

Dave's right, those are DOHC lifters.

These are the ones you want;
http://cgi.ebay.com/ebaymotors/97-03-3-5L-Mitsubishi-Montero-Sport-6G74-V6-Lifters_W0QQcmdZViewItemQQhashZitem5635280dd7QQite mZ370259004887QQptZMotorsQ5fCarQ5fTruckQ5fPartsQ5f Accessories

Well Done Mitch, the picture says it alot better than my ramblings and that is an excellent price too.