news just in
the A series head is 15 inches long and the J series is 18 and a total length of about 22 inches. so the head is longer by a bit but i dont have any A series cranks to measure for the overall length ( they are all at work!!) so if u have an A series then measure the overall length as a rough guess

and no im not pulling the sump off to count main bearings :)!!


ben

I think the J15 has a three bearing crank.

seriously they are a bigger motor!!
either i am thinking of another J series or they are deceptive cos they look as big as an L series


ben

I'd like to know if a J15 crank fits into a A14/15 block!

I can get my hands on a wreak of a ute with a j15 in it if any 1 wants 1

so, the engine is not the best to do one upgrade to a datsun 1200?

thanks to all

The J15 is a very good engine.
The A15 is a GREAT engine.

ops nvm sry, read the post wrong

oh did i mention the cost and scarcity of parts for the j series??

dont even get me started!!

ben

the j 15 is one big hunk of a motor
it has iron head and looks at least twice as heavy as the a series
i have one in a fairlady 1500 and it aint inspiring
the a series is a far better motor in my opinion as it at least has decent valve stem seals and a head made of a 20th century metal
ports on the j series arent too bad but not good enough to justify the weight


ben