datsunfreak Posted February 1, 2017 Report Share Posted February 1, 2017 A friend has a 521 with the early pushrod engine. It's seized and obviously parts for it are hard to find. He has tons of L parts, two complete L16s, and a couple of 5spds. So what does it take? Do I need the L engine brackets from an L-powered 521? From pics, they look awfully similar to 510 engine brackets. Any other things to look out for to do the conversion? Quote Link to comment
kelowg Posted February 1, 2017 Report Share Posted February 1, 2017 Weld in new motor mount point on frame. Engine brackets and rubber mounts should same as 510 i believe Quote Link to comment
datzenmike Posted February 1, 2017 Report Share Posted February 1, 2017 That would be the one year only '69 L521. Earlier is a 520, later is a PL521 with the L16 Frame mounting for the rubber isolators are much different than for the L series. Get your welder. 520 and J13 powered 521 had a 4.875 ratio differential. It's going to rev like crazy but the L16 can handle it. Depends on the 5 speed.... the dogleg will fit without cutting the driveshaft but the 71B transmissions will. Both will need mounting modifications. 2 Quote Link to comment
Loryde520 Posted February 1, 2017 Report Share Posted February 1, 2017 That would be the one year only '69 L521. Earlier is a 520, later is a PL521 with the L16 Frame mounting for the rubber isolators are much different than for the L series. Get your welder. 520 and J13 powered 521 had a 4.875 ratio differential. It's going to rev like crazy but the L16 can handle it. Depends on the 5 speed.... the dogleg will fit without cutting the driveshaft but the 71B transmissions will. Both will need mounting modifications. You are correct on the motor mounts Mike. I've got an L20B in mine and the only real problem is you can't run a mechanical fan unless you cut the rad support. I did'nt want mine cut, so I went with an electric push fan connected to a thermostatic switch. The heater lines will be tight between the head and firewall. I will be installing a dogleg 5spd from a 200 sx soon, so I will let you know of any mods. I currently have a 510 4spd with a custom made 1 piece drveshaft. Alternator will have to go onto the left lower side of motor too. I'm not sure what oil pan I have, it came with the truck. The cross member has to be modified a bit too. Quote Link to comment
datsunfreak Posted February 1, 2017 Author Report Share Posted February 1, 2017 This sounds a little more involved than I initially thought... :rofl: Quote Link to comment
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