6 replies to this topic

[Dangerous]

Well, the big four bolt on or 'minor' mods are always cam, carby, exhaust and ignition, probably in that order of improvement as well. A stock downdraught Stromberg in good condition is not actually a bad performer at all.

"Cheap" options for carbies are either a Stromberg two barrel carb and manifold (a single two barrell, not the old HR twin carb downdraught version - yeucch!) as used on 186S and 161S engines as well as most of the 253s, or a Holley 350 and Redline or similar manifold. Whichever one you look for, make sure it is good condition. If it's worn, it won't perform!! I have also heard that the 6 cyl blue motor Rochester carb can be made to work well, but I'm not sure inlet manifolds are readiliy available for it.

If you do decide to replace the cam, make sure you also replace the stock fibre timing gear with an alloy one.

Keep an eye out for a Yella Terra head to suit your engine.

Above all, try to match your components - for example, a big cam with a stock head, carb or exhaust is not going to give you much improvement at all.

Lastly, if we're talking LH/LX, weigh up the cost/benefits of doing all the above mods to a 6 cylinder, vs fitting a stock 253 or 308. A stock 253 fitted with a Quadrajet carb will usually outperform most hot 6s, both in performance and economy.

[Tiny]

Gday Noi5ey,

Ive been through what your asking as i wanted to get a little more out of my old 202 without breaking the bank!
Here's what i did:

Webber ADM carby ( From an XE falcon) on a torker 2 manifold,
Mild cam ( i went a bit too small )
Hurricane extractors and 2.25" system with a single muffler.

The car sounded AWESOME and went surprisingly well. THe only toher thing i would have done was electronic ignition.

All up i think it cost me $550 for the exhaust, another $700 for the carb/manifold and fitting/tuning and the cam i got done cheap my a mate.

Dangerous is right, its all a combo so make sure the stuff you decide on works well together!

OH.. and i'll move this thread into the general help section. Cheers!

[rodomo]

Cheap option. Go to pick a part and grab a Varijet of a 3.3 and bolt it to your 4bbl manifold asing 3/8 alloy plate adapter. While your there grab a cold air induction air cleaner and duct off a VH starfire commodore. Lift the cap off your dizzy and slowly rotate your engine until you can see the fly weight springs through the gap in the breaker plate. There are 2 springs 180 degrees apart. Bend the post at the end of the finer one about 1mm toward the outside of the housing (putting a little more tension on the spring) Then on the thicker spring bend the post about 1/2 of 1mm (this will take up any wear in this spring and post. Now advance your timing 4 degrees more than what it should be. E.G if it is meant to be 6 degrees make it 10. This combo will give it more lift off the mark and i read somewhere that varijets are bigger than 350 holleys at full noise. It should also improve economy if you drive it quietly. You might need a 3.3 comm. fuel pump to feed it if you want to thrash it. This would set you back around $100 all up.
RACV MAN

[FastEHHolden]

I have weber ADM and 12mm alloy spacer that can be drilled and tapped as an adapter.
$70 for both bits