Droski Posted June 3, 2018 Report Share Posted June 3, 2018 Question, will a J15 engine out of 73' 510 bolt in to a 66' 520 pickup? I know that the J15 and J13 are very similar. If this swap is possible how much more power will I gain, the top speed right now with the current J13 set up is about 60-65 wondering if it would be even worth it to make the swap.any info is greatly appreciated. Quote Link to comment
datzenmike Posted June 3, 2018 Report Share Posted June 3, 2018 J15 must be from a Mexican 620 because we only got L16s in the 510. Better check and see. Maybe someone swapped one into a 510..... although I do not see why. But, a J15 is only a bored out J13 and will look identical on the outside so if you have a J13 an J15 will swap right into a 520. It will make about 10 more hp Quote Link to comment
Droski Posted June 4, 2018 Author Report Share Posted June 4, 2018 Thanks. Yes it has the hecho en Mexico stamp on it! Quote Link to comment
datzenmike Posted June 4, 2018 Report Share Posted June 4, 2018 Ah, wasn't sure if the Mexico 510 got the J or the A series engines. Quote Link to comment
paradime Posted June 4, 2018 Report Share Posted June 4, 2018 I know at least some of the 510s in Mexico came with the A. I've seen a few around. Also came with straight axles and leaf spring rear suspension. 1 Quote Link to comment
datsunrides Posted June 4, 2018 Report Share Posted June 4, 2018 If your just looking for better freeway cruise, better to change the rear gear as the J15 is not going to make much of a difference there. Just going to max out a little quicker. I swapped from the stock 4:88 to a 4:37 from a 521 and it helped out on the freeway and didn't kill acceleration that much. If I ever build a 520 again, I would seriously consider something like a 4AG engine swap as it's a fairly compact engine and makes good power. The J motors are just barely powerful enough for in town driving, let alone on the speeds people drive on the highway now. Quote Link to comment
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