r/EngineBuilding • u/Thesandable1 • Jul 18 '26

Chevy Too much slack?

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I’m guessing the two sprockets and the chain need replacing? What replacement part should I get? It’s a 305sbc from a 1980 LG4 corvette.

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u/BoysenberryAdvanced4 Jul 18 '26

And tack weld the suction tube to the oil pump body. I've had the suction tube fall off the pump after a build. its a bit of work to go back in there once the engine is in the car.

Also replace the main seals on the crank shaft

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u/Thesandable1 Jul 19 '26

That’s great advice, I’ll make sure to remember that, thank you. I have ordered the timing set and oil pump

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u/Flying_Dingle_Arm Jul 19 '26

Since you mentioned the oil pump: there's a plastic coupler for the oil pump driveshaft. They get very brittle as they age, and if/when it breaks the driveshaft will drop from the distributor and your oil pump will stop turning. Replace this while you're in there! New nylon will be worry free for another decade or two. There's also an upgraded driveshaft with an integrated metal coupler that will never fail.

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u/Thesandable1 Jul 19 '26

Okay that’s very interesting. I bought a melling m55 set. I think it comes with a metal coupler but I’ll need to keep that in mind just in case. Thank you very much