Lumlo Posted May 28, 2013 Report Share Posted May 28, 2013 A month ago I picked this extra clean 1978 620 KC up from an auction. It had been stored for some time in a non running state. Towed it home and started to dig into the engine. After finding zero compression in #1 cylinder, I pulled the head Apprenently the intake seat decided to take a vacation Rather than rebuilding this engine, I found a donor motor than was in running condition. https://vimeo.com/65230330 After a bath, I decied to replace all the seals and gaskets Since it was out, one thing lead to another, and I dug in a little deeper Replaced the rings and rod bearings on this previously rebuild L20 Will update again once I get it on the road, (waiting on a center support bearing) Road worthy update: As some of you might know, I had a little issue with a missing pilot converter when I pulled the original engine and "auto" trans out. I was unaware there was such a thing as a pilot converter because this truck didn't have one. But once I started the reinstalled engine/trans combo it was all too apparent with a loud bell ringing sound coming from the bell housing that something was amiss. Memeber h190 supplied me with the missing spacer and I was set with the task of installing it. I found the easiest way was to remove the driveshaft, unbolt and slide the trans back, support the trans with a strap and using two breaker bars to unbolt the flywheel. Took just a few hours, start to finish. 1 Quote Link to comment
Farmer Posted May 28, 2013 Report Share Posted May 28, 2013 Congratulations on the find. Clean looking 620 Quote Link to comment
DatDoug Posted May 28, 2013 Report Share Posted May 28, 2013 Very nice truck. Good job on the motor. Looks good. Bet u cant wait to drive that Datsun! Quote Link to comment
Eagle_Adam Posted May 28, 2013 Report Share Posted May 28, 2013 clean truck!! great save too :D Quote Link to comment
carl Posted May 28, 2013 Report Share Posted May 28, 2013 nice truck wish I could find them down here Quote Link to comment
Aibast Posted May 29, 2013 Report Share Posted May 29, 2013 good work on the engine - did you portmatch the intake and exhaust manifolds or did Nissan produce them in correct size from the start? I've seen a lot of engines with bad casting and mismatching manifolds. Quote Link to comment
Lumlo Posted May 29, 2013 Author Report Share Posted May 29, 2013 good work on the engine - did you portmatch the intake and exhaust manifolds or did Nissan produce them in correct size from the start? I've seen a lot of engines with bad casting and mismatching manifolds. The donor engine I purchased came with a nicely ported peanut head and a brand new set of headers, plus this Edelbrock intake manifold. The inner and outer runners are slightly different diameters, I imagine to maintain the proper balanced velocity, so I have not messed with the intake. This engine is a stop gap, I am going to either rebuild the original engine or do a engine swap from a later model, haven't decided. I just wanted to get this 620 on the road in the meanwhile. 1 Quote Link to comment
Cardinal Grammeter Posted April 9, 2014 Report Share Posted April 9, 2014 Wow, looks like you could mill that head and pick up a massive quench area (opposite the spark plug) and then open up the chamber near the plug so you have no opposing quench surface. Hard to tell from pic but maybe .060 might get the job done? Then run piston to head clearance around .035 and you can run probably 1.5 more points of Compression Ratio without changing gas or timing. Very interesting head. Quote Link to comment
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