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holden red/blue/black

can't believe some of the bull[Naughty Pottyword] on this site on getting horsepower out of the old holden six. as an "OLD BLOKE " who has built and raced many reds/blues/blacks ( one with a alloy duggan head pumping out 320 hp on carbs ) i can tell you its not the $$ you spend but the combination you come up with. no use having a trick head and a standard cam and or a set of tripple webers/dellortos and a standard head/cam combo. it must be matched !! if you need help sorting out some mods drop me a line and ill see if i can help you out.



I'm not really into 6's. But can you give me any advice on red 253's please?


Disclaimer: I know absolutely nothing about cars and (puters).

I'm right 98% of the time. Who cares about the other 3%.

[Postcode 3518]



you can contact me at harrys.2.4.6@hotmail... don't spend much time on the computer so don't be offended if i take a while to reply to you !


202's reds main let down is the flow in the head. Even a tricked head with a standard cam is a big improvement. 320hp is a major jump to what most people achieve out of these things but a 40/80 cam with a ported & big valve head with tripple webbers isnt a hard combination to work out because theres allready a large amount of them out there...

I agree that 320hp is a big increase(if running unleaded as we are these days). But aside from the fact that a Duggan head would be considered a very expensive addition to a Holden six. And as such. Wouldn't count in JH's,"its not the $s you spend" call. How many dudes are using, or can even get an alloy Duggan head?
What sort of figures are you getting from a 202 built with readily available parts JH?
Any chance you could post up some photos of the 320hp Duggan headed Red.


Campbells Shed
Postcode 3147.

is a total horsepower figure important on a street car?
Im about to rebuild (or get built) a 3.3 efi black motor am using a vn delco computer for me ek it has a 3.08 diff and trimatic what grind of cam should i use and what should i be getting done to the head, the car will be a sunday car only so not real worried about economy to much and is using v8 1:6 rockers a good idea?
would be keen to read a few recipies on how its done.
would a harop super charger be a good idea?(im thinking yes) and what comp ratio and how should it be achieved?

your are probably right about the duggan alloy head not being affordable ( paid $2500 for head and intake manifold back in late nineties ) but they are still readily available ,as is the similar designed jzed alloy head.Have built sixes in a bit milder tune with off the shelf bathurst 6000 yella terra head, triple 48mm dellorto's etc that have made around 230-250 hp and were still definately streetable.dearest bit is the parts needed to get the old buggers to hang together and be reliable when you rev them hard,but they are a great motor to modify.Had a mate that used to race street car class out at symons plains a few years baak in a th commodore that was getting close to 350 hp ( confirmed on engine dyno ) out of his 200 !had some good gear in it, phil irving head ,tripple 55mm webers ,and big dollar bottom end with carillo rods and cosworth pistons etc.but that was a very special engine thas for sure. used to rev it to 7500 rpm .even a mild setup will get them going okay as long as the head ,cam ,carb and exhaust combo is well matched .


On the street you build for torque, on the track you build for horsepower and gear accordingly.

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