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**MikeB** · 11-30-2015, 02:43 PM

If the 305 needs only minor repairs, keep it. But if compression is low or it's smoking like crazy, a new GM base 350 crate engine is probably cheaper than properly rebuilding a 305.

Here's a new 73-85 truck engine:
https://chevroletperformanceparts.co...85-most-models

And a 87-95 engine:
https://chevroletperformanceparts.co...95-1500-trucks

I'm not sure which one would cover 1986. Somewhere around 86-87, half-ton pickups got engines with one-piece main seals, and some got roller cams.

11-30-2015, 02:43 PM	#16
MikeB Senior Member Join Date: Jul 2000 Location: North Texas Posts: 3,672	Re: Is "all original" worth keeping a 305? If the 305 needs only minor repairs, keep it. But if compression is low or it's smoking like crazy, a new GM base 350 crate engine is probably cheaper than properly rebuilding a 305. Here's a new 73-85 truck engine: https://chevroletperformanceparts.co...85-most-models And a 87-95 engine: https://chevroletperformanceparts.co...95-1500-trucks I'm not sure which one would cover 1986. Somewhere around 86-87, half-ton pickups got engines with one-piece main seals, and some got roller cams. __________________ Mike 1969 C10 LWB -- owned for 36 years. 350/TH350, 3.08 posi, 1st Gen Vintage Air, recent AAW wiring harness, 5-lug conversion, 1985 spindles and brakes. 1982 C10 SWB -- converted from 250-six to roller cam 350, Vortec heads -- sold 1981 C10 Silverado LWB, 305, TH350C -- sold, but wish I still had it! 1969 C10 (not the current one) that I bought in the early 1980s. Paid $1200; sold for $1500 a few years later. Just a hint at the appreciation that was coming. Retired as a factory automation products salesman. Worked part-time over the years for an engine builder and a classic car repair shop. Member here for 24 years! This is the very first car/truck Internet forum I joined. I still used a dial-up modem back then! Last edited by MikeB; 11-30-2015 at 03:05 PM.