Re: 250 6cyl to 283 swap ?
Welcome to the Club! The 6-cyl can be removed and replaced with a V8, but value would drop, unless you kept the OE engine and everything else removed from the swap, and handed it over during the sale. If it were me and my car, I'd keep it original because of the options installed, JMHO. Its your car and your decision. Go for it!
However, getting back to the swap, do a search here for engine mounts, the ones bolting onto the frame. The OE 6-cyl mounts would have to be unbolted and removed, V8 stands put in place and bolted up. Don't drop any nuts inside the frame as it is gone, use tape on the box end wrench. The frame mounts I'd use would be for a 307/327 V8. This model of mount would position the engine forward enough to install an HEI distributor later in life if so desired.
Look in Rick's catalog and others for frame mounts and pictures of parts to get the names and an idea of what's out in the market for this swap.
Alternator bracketry will have to be bought. W-style exhaust manifiolds would be needed to be fitted so the OE (original equipment) lower bracketry would bolt up. Upper adjustment bracket bolts to alt and intake manifold.
Power steering bracketry, if equipped, would have to be found and installed for a V8.
Radiator hoses for a V8 and heater hoses also. The present radiator would work, have it cleaned, but a SBC V8 fan shroud would have to be gotten. Don't forget pulleys to match if the 283 does not come with them.
The fuel line from the tank is 5/16 inch diameter and it will suffice very well and its output is in the same spot needed as for a 6-cyl or V8.
The 6-cyl starter can be used if the flex plate from the 6-cyl is transferred over to the V8.
Wiring harness will work, you may have to fold up the ignition coil harness as the coil is now in the rear of the engine, not at the front. No resistor block is needed if there is a cloth covered wire from the firewall connector and if you run a point distributor. AN HEI distributor will work, but one must change out the cloth covered wire from the firewall connector with a 12 AWG stranded wire. This wire can be routed from the inside fuse box terminal labeled "IGN" for easier install. The water temp & oil pressure will work fine. A/C should work as well.
The carb linkage will need to be shorten, hacksaw into two pieces, clamp in place the length needed and weld it together. Or, replace it with a cable system from a 69 Camaro.
The Powerglide kickdown linkage will need to be from a SBC V8. A 6-cyl linkage will not transfer over. Recycle yards will have them in 68-72 Nova's and clones, or most any V8/powerglide equipped vehicle. And trans cooling lines will remain the same. You might consider converting to a TH350 with 6-inch tailshaft as it is a direct bolt-up. Shifter gate plate would have to be notched out for manual selection 1st gear, otherwise fine. Cooling lines transfer also. Use TH350 convertor as the P/g convertor has a smaller input shaft diameter.
There you have it, some work involved. i've done this swap out using stock parts from the yard and has worked very well. You & yours will have to figure what route to take and what aftermarket item to replace, ie, exhaust manifolds & exhaust, you may chose a shorty header, or a full length header, and dual exhaust. And there are other countless options to chose for swapping out OE for aftermarket.
If you do decide to use the Corvette 283, I suggest you at least get the oil filter adapter to change it from a cannister to throwaway filter and use the short one, similar to Fram PH8, especially if using full length headers. Summit Racing sells the adapter.
Place the driver's side header in first, then the engine, installation will be alot easier.
Others here will give their suggestions, so you & yours won't be left out in the woods.
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