Rods need to re-sized on the big ends when rod bolt are installed, and I use ARP 206-6001 in every 1275 I build. Resizng the connecting rods is one of the biggest things looked over in a hobbist rebuild, and most times one of the most needed machining jobs to do in rebuild. Connecting rods over time get egga shaped, getting bigger at the parting line of the two section of the rods, and don't hold the bearing as well, I consider sizing the connecting rod big end a absolute must on engine rebuild.
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Hap Waldrop
Acme Speed Shop
Greenville, SC
Performance/Race MGB/Spridget engines and heads
Superlite Wheels
Quality Engine Rebuilding Kits
www.acmespeedshop.com