hey umm where do i start i have recently purchased a 1978 620 and i want to swap out the exsisting motor and transmission but i have zero resources to go to so im looking for any help that could get me headding in the right directioni want to swap in an sr20det but ive started to hear that the ka24de is the better of the both so im not shure what direction to go . id like a healthy 400 horses but i want it to be reliable. its gonna be a daily driver so any help would rock.

Welcome aboard!

Lots of good info here - Make sure to browse the other forums here, especially Hybrids.

You won't see 400hp out of an SR or a KA without some substantial work.

Then again, 400hp in a 620 will render it pretty much undriveable by all but the best.

In fact, if I were building it, a nice N/A DOHC KA swap with bolt-ons and some massaging would be my choice... You'd be doubling the hp, and adding a bulletproof and reliable modern drivetrain.

cluelessn1nja wrote:hey umm where do i start i have recently purchased a 1978 620 and i want to swap out the exsisting motor and transmission but i have zero resources to go to so im looking for any help that could get me headding in the right directioni want to swap in an sr20det but ive started to hear that the ka24de is the better of the both so im not shure what direction to go . id like a healthy 400 horses but i want it to be reliable. its gonna be a daily driver so any help would rock.

Welcome to the forum!! 400 horses?? Hollee crap!! That is asking way too much from a 620 without making it unstreetable.

I know you can make a L20b scream...just get the right parts. I would recommend Z22 pistons, Dual side drafts, long tube headers with a 2.5" exhaust, a moderate comp cam (have yours reground), and a 5spd.

Then you should consider your rear end....not sure what to put in there.

The best option for bolt in power is a KA.

a ka24de has weaker pistons than a sr20det. the sr20det can EASILY and bulletproof-ly make 350 hp, all day long. You will want traction bars. You have got high hopes though, so lots of money will be "invested", and never to be seen again.

seang wrote:a ka24de has weaker pistons than a sr20det. the sr20det can EASILY and bulletproof-ly make 350 hp, all day long.

I'll refer you to the KA vs SR thread. Let's not go spouting misinformation unless you've built one. Or five.

An SR will require the SAME work to make 350hp. Period.

Remember, it only made close to 200 in stock form.

You can have more than 400HP and be streetable. Check out the pics at http://www.photobucket.com/v8datsun http://www.photobucket.com/v8courier

"Streetable" is a relative term.

My Ka-T powered S13 droptop is pretty sketchy in all but perfect weather.

A pickup has horrible weight distribution and will be a tire-boiling, tailhappy monster.

AZhitman wrote:"Streetable" is a relative term.

My Ka-T powered S13 droptop is pretty sketchy in all but perfect weather.

A pickup has horrible weight distribution and will be a tire-boiling, tailhappy monster.

Hahaha...so true! My 620 with my modded L20b likes to slide off the line if you know what I mean. I have to take it gingerly off the line then...floor it! lol

well ive been considering the ka24de for some time now. and i would love to do it but i dont know where to start i ve scower the interwebs and i havent come across any shops that can make the ka24de fit. id like to be able to take it somewhere that will do good work and not butcher the car. its in ok shape now for being my first car it needs some work but im will ing to take the time and money to get it fixed. any help with local shops would help. oh i live in arizona.

cluelessn1nja wrote:well ive been considering the ka24de for some time now. and i would love to do it but i dont know where to start i ve scower the interwebs and i havent come across any shops that can make the ka24de fit. id like to be able to take it somewhere that will do good work and not butcher the car. its in ok shape now for being my first car it needs some work but im will ing to take the time and money to get it fixed. any help with local shops would help. oh i live in arizona.

The KA is a good choice and there are parts everywhere. Be careful when choosing a shop to do the work....if you can, look into doing the work your self.

I'm in the exact same situation, a 78 620 looking for engine swap.

I was wondering if the L20 could be replaced with an L28ET easily?
Modified by onesixteenth at 9:19 PM 5/7/2009

phlebmaster wrote:
The KA is a good choice and there are parts everywhere. Be careful when choosing a shop to do the work....if you can, look into doing the work your self.

Reminds me of an old post in the 240sx gen where a kid wanted to buy a front clip of an r34 and a rear clip of a silvia and weld them together. He already called around and had a shop tell him they would do it.

But yeah ask on local car forums about reputable fab shops. I know some local guys near me love doing crazy stuff, and who wouldn't want to build an SR datty.

Also Doesn't Greg live in PHX.

I am sure he knows somebody.