2 replies to this topic

[sr2]

Hi all. Sadly not from a Torana but it’s Holden and in my opinion you guys are, and always have been the go to Holden 6 brains trust. (LOL, yes I know flattery gets you everywhere……..!).

 

Early HD/HR block (massive amount of sentimental value).

https://oldschool.co...”-build-thread/\

 

• 186 block .060” over with 3.25” Blue crank (208 ci).
• 9.5 to 1 (approx.) compression ratio.
• Stage 3 Yella Terra Head
• 5:1 Y/T Roller Rockers with double valve springs.
• Electronic Ignition
• Lightened std. flywheel.
• Mild street cam.
• Extractors into 3 ¼” exhaust.
• Single 32/36 dual choke downdraught Weber Carb (300 cfm) on a  Kel-co Manifold
• Manual transmission.

 

Found a set of Starfire rods from a low mileage Blue 3.3 and had them lightly blasted. While balancing the rods, (i.e. bought the missus a bottle of wine and some flowers and while distracted “borrowed” her new digital kitchen scales!) I noticed theses marks on both sides of one rod. Having many years ago in a previous life worked as a machinist they appear to me as being from a sizing procedure in the initial production, would be interested to know your thoughts?  

 

 

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[warrenm]

The marks look like a "bruise", possibly from pressing the original piston off, I had a similar mark on a conrod for 304 that I was building for a mate. should be ok if you dress it with a file, emery etc. might need checking for straightness. If you are going to use big revs or big boost, might be better to change them out. 

[Shiney005]

I have pulled apart a few "unopened" motors, and have never seen that.