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Holden 6 secrets, anyone got any to share?

Started by Com_VC , Jul 04 2008 07:00 PM

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46 replies to this topic

#1 Com_VC

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Posted 04 July 2008 - 07:00 PM

Hi,

Just wondering if anyone has any Holden 6 secrets to share, what to do to make them last etc.

There was a great article posted awhile back about some interesting oil mods, drilling and taping into the side of the block and adding some extra lines etc.

Something about a Massey Ferguson tractor balancer.

I'm building up a 202 at the moment for a turbo build and figure I may as well do some of these things while I have the chance. The oil mods sound interesting and wouldn't mind hearing a bit more about em.

Here is what I have so far.

Discard fibre cam gear if still fitted and replace with alloy gear.

Replace plastic dizzy gear with steel gear which can be obtained from a Holden 6 oil pump. Some people say this can increase cam wear?

Front oil gallery welsh plug. Tap this and fit a grub screw. Just heard about this one, does the welsh plug have an issue with popping out?

So what things would you do?

Hopefully this will become a useful thread. Just like many others on this forum.

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#2 _revmaniac_

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Posted 04 July 2008 - 10:22 PM

hey man this is old hearsay...none has been tested by myself......maybe others can verify....research these ideas first!!!

modified 308 oil pump gears in the 6 cyl housing....shortened i think
SBC valve springs...need head machining AFAIK
302 rockers.....higher ratio supposedly....unsure of windsor or clevo

this stuff i know for sure...

reds LOVE lift.....
obvious stuff like good quality oil and filters changed REGULARLY like 5000km...NO MORE
get the right waterpump...sticky on here somewhere about factory ones SH$TTING all over cheap ones...
quality machining...if everything lines up right its free HP and less wear......

TUNE IT RIGHT.....rich engines wash bores and wear quickly...the oil is contaminated prematurely

and if you happen to be running roller rockers you can restrict the oil to the topend leaving more for the hard working bits downstairs

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#3 _@milco@_

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Posted 05 July 2008 - 12:22 AM

spend most of your money on a decent head, this is the difrence between a quick holden 6 or a bloody quick holden 6 oh and cam choice is very important

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#4 _Brad1979UC_

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Posted 05 July 2008 - 12:24 AM

Replace plastic dizzy gear with steel gear which can be obtained from a Holden 6 oil pump. Some people say this can increase cam wear?

Ive head that this isnt a good idea...it makes sense...as ive had my gear strip in the middle of SA and VIC :<_<:

...however i cant remember why its not a good idea...it may have been cam wear but i think there was another/other very valid reason.

Ive head that Ecotec V6's have factory roller rockers and that they bolt onto a red 6...bit skeptical, got told this by a bouncer when i rocked up toa party, so i really got no idea if you can do it or not.

Edited by Brad1979UC, 05 July 2008 - 12:25 AM.

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#5 _mervex_

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Posted 05 July 2008 - 08:17 AM

308 gears into a 6 oil pump. you need to machine the 6 oil pump body deeper to fit the longer 308 gears.I had this in for about 8 years.That was before JP were availible. Probly cost about the same but you get a new pump with the JP.I think JP also make brass? oil pump gears, much easier on the cam gear.302 Windsor roller rockers add more lift, however, the rocker studs need to be moved 2 mm away from the valves to get correct geometry,i have just done this.

Edited by mervex, 05 July 2008 - 08:21 AM.

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#6 Com_VC

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Posted 05 July 2008 - 11:26 AM

What are the differences between a stock pump and a JP pump?

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#7 _mervex_

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Posted 05 July 2008 - 02:03 PM

the JP pumps have all this from new,no machining needed.most holden pump bodies are now worn.

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#8 Com_VC

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Posted 05 July 2008 - 02:09 PM

so it's just a holden 6 pump with v8 gears fitted? Are they a new cast or just modified holden factory casts?

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#9 _Bomber Watson_

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Posted 05 July 2008 - 04:00 PM

Replace plastic dizzy gear with steel gear which can be obtained from a Holden 6 oil pump. Some people say this can increase cam wear?
Ive head that this isnt a good idea...it makes sense...as ive had my gear strip in the middle of SA and VIC ...however i cant remember why its not a good idea...it may have been cam wear but i think there was another/other very valid reason.

Tends to create a missfire at higher rpm as things start chattering, mainly with HEI ignitions

Edited by Bomber Watson, 05 July 2008 - 04:00 PM.

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#10 _202LX_

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Posted 05 July 2008 - 04:21 PM

I have seen holden sixes that have had the head bolt tunnel that runs through the intake ports completely removed. They just put a shorter bolt in with an allen-key head and the top of the bolt sits on the bottom surface of the intake ports

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#11 _waratah_

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Posted 06 July 2008 - 02:10 AM

If your going for a big cam, our experience is triples go much fraken harder than any holley.

Edited by waratah, 06 July 2008 - 02:10 AM.

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#12 _mumstaxi_

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Posted 06 July 2008 - 09:45 AM

If your going for a big cam, our experience is triples go much fraken harder than any holley.

Ive seen twin carby set ups , but triples on a "Turbo" 202, (LOL) id like to see that one !

Be carefull with big cams and Turbo engines, as BIG is not always better and can actually make car slower (this from experience)

202 + Turbo + NOS =

MT

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#13 _gtrtorana_

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Posted 06 July 2008 - 09:57 AM

Flycut the deck for big valves and beter air flow in and out of cylinder
Posted Image

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#14 _mervex_

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Posted 06 July 2008 - 12:49 PM

I have a red head that has dividers fitted to the inlet ports to form a "12 port" 9 port head.It is ex speedway I think, and the ports are huge as are the valve sizes.It has small chambers and is for sale as it is now not needed(one more project i don't need)DOH, i just reread your post,no good for you either but a "speed secret" all the same!

Edited by mervex, 06 July 2008 - 12:50 PM.

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#15 Com_VC

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Posted 06 July 2008 - 01:41 PM

Yeah finding a worked 12 port head has been a problem for me, very hard to find. I might just have to get one ported and fitted with bigger valves. What is the maximum size valves that can be fitted to the 12 port?

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#16 gooley

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Posted 06 July 2008 - 05:09 PM

If your going for a big cam, our experience is triples go much fraken harder than any holley.

Im gonna try a big cam with SU's 3/4in on my motor.... hopefully it turns out good but only problem is Fuel but worth it :spoton:

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#17 _gtrtorana_

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Posted 06 July 2008 - 05:50 PM

Im gonna try a big cam with SU's 3/4in on my motor.... hopefully it turns out good but only problem is Fuel but worth it

From my experience, the triples are pretty fuel efficient unless you open the throttle wide open. I had an engine that had both a single Holley and a set of 1.75 Strombergs at one stage or another and the triples overall were beter on fuel than the single crab.

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#18 _gmlj6_

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Posted 06 July 2008 - 06:00 PM

ive found that a good head and exhaust is the key. i gained 24rwkw from changing from cheapo extractors to a nice set of genies

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#19 GTR469

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Posted 06 July 2008 - 08:20 PM

GOOLEY, what motor are you running, and what size cam are you looking at.

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#20 _why-psi_

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Posted 06 July 2008 - 09:59 PM

i had a Heatseeker Stage 5 cam (its in my shed now) and tripple 1 3/4 SUs. sounded very angry and went quite hard.

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#21 _tyre fryer_

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Posted 07 July 2008 - 02:09 AM

ive found that a good head and exhaust is the key. i gained 24rwkw from changing from cheapo extractors to a nice set of genies

WOW! this must have been an otherwise free flowing motor. I mean those weren't really gains that was just freeing up power that you had but were restricting right?
still, awsome advice for anyone looking to make a serious red 6.

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#22 _Brad1979UC_

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Posted 07 July 2008 - 02:49 AM

Thats a massive power gain!Im actually a bi skeptical...were they really poorly designed extractors that you ha don there previously?? Have no idea what brand mine are (if any) hmmm idea?

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#23 _gmlj6_

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Posted 07 July 2008 - 06:11 PM

the motor is a stock 186 with a xu1 202 head ported ( done at rams head service the bloke knows his stuff) with a camtech hydrolic long duration cam (282 @ 50) with triple 1 3/4 inch su's . stock dizzy. the old extractors were motorvator and it had a 2 inch system with a xu1 muffler. that made 84.8 rwkw changed the extractors and got a 2 1/4 system done with a glass pack straight through muffler and it then made 106 rwkw and with a bit more tuning made 108.8 rwkw through a trimatic with a 2500 stall wich is now to small.

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#24 GTR469

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Posted 07 July 2008 - 06:54 PM

I am trying to work out which cam i should get for my 186, not sure wats done internally but i know it has a 202 head, also runs tripple 1 3/4 SU's, electronic dizzy, solid lifters, roller rockers. Driveline is a M20 with a 3.08 LSD.
Any recommendations will be greatly appreciated GTR469

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#25 _gtr161s_

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Posted 07 July 2008 - 09:10 PM

electronic ignition out of a blue commy is worth it but before they existed my brother and i figured that you could convert a valiant electronic ign to fit into a red 6....presto electronic ignition in a holden red 6, 1981.

I think you could buy an after market one but they were really expensive