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Sr20 block wedges

Practical Engine Building

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Hi, for higher power SRs I've seen seen people out wedges in the slits between the cylinders.

I was wondering the best way to go about doing this. Steel or aluminium wedges? Chemical bond? Or tig weld? And why one would be better than the other.

Secondly if anyone has any links where to buy the parts necessary it would be greatly appreciated


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