there was some interesting discussion in another thread a little while ago about pushrods rubbing on blocks. I had my head off yesterday and found that I have exactly this issue...

thick flange 1100S block w/ 12G940 head
RE83 cam
Minisport 1.3:1 roller rockers
1mm spacers under posts

all of the pushrod holes have the same issue, they're too far back and too close to the centre of the bore. Most of the pushrods have the same sort of wear, either in 2 spots or just 1. The one pictured below is the worst

something else to correct next time I have it apart... I guess a bit of paint on them and turn the engine over to see wear it rubs then grind it away, or do you simply bore the hole to line up with the head?

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did I tell you that I won a trophy?

If my memory serves me correct, when Vizard identified the problem years ago said you need to oval the hole in the block rather than make it simply a bigger round hole. I think that he even had photos of a block cut away in one of his books.

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The bitterness of poor quality (or Crappy Workmanship) remains LONG AFTER the Sweet Taste of Low Price is forgotten.

What were the issues with simply making the hole bigger?

Are your rockers centralised over the valve stems?

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67 Deluxe
Dry suspension
1293cc, 11:1 comp, RE 282 camshaft, 45 Weber, extractors etc
4 synchro close ratio gbox
Cooper S brakes, no booster
Stealth box, as Doc says "goes harder and idles!"
RH tank cos I needed it crossing the Nullarbor etc..

yep

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did I tell you that I won a trophy?

I seem to remember Matt Read saying he has always just drilled the block holes bigger during a rebuild. This was in the context of better oil drain back, pushrod rubbing wasn't mentioned then.

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DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R.