What to do?

[zwhore]

i cant decide what to do here. some input would be nice.( i have trouble making up my mind on anything)

i have a 77 with a freshly rebuilt stock 2.8. it was rebuilt at a nissan dealer with only new nissan parts. everything in it is new.(cost was like 2800 in parts)

then i have a 73 with f54 block, su's, header.(unknow miles)

i want to make the 77 in to zg, so triple carbs are must(even though i prefer efi).

so do i use the new motor, or just pull the 73 motor and use it. (i would put a stock 73 motor back in the 73 and sell it, its very clean). i would have to pull the head anyway to port the hell out of it and slap a cam in it. the f54 block already has the flattop pistons, mine doesnt. the one has header already, mine doesnt.

how much more would a 2.8 in 73 bring compared to a stock( non #'s matching 73).

to many options.

regaurdless, i will have weber 60mm t/b for sale after its done.

anyway, just looking for some outside z input.

thanks

tony

[zeiss150]

what kind of heads do you have to choose from? If your choises are N47 from the 77 engine and the E88 from the 73 engine I guess I would go with the E88 head. The block doesn't matter, F54 or N42 there is no performance differance. the only time the block matters is if you are going to over bore 120thousands then use the N42 (thicker walls). but if you are just going with stock 2.8 use the F54 it already has the flat top pistons. Now is it an F54 with a P79 head (which would be the stock ZX N/A configuration) then I would go with the P79 head. The combustion chamber design is far better than the N47 Or the E88 and will flow better than both in its stock form. The Stock compression raito with that head and block and piston combo is somewhere around 8.5:1 a nice streetable C/R. If your gonna make an all out bad arse tripple race engine then I would bump that CR up to around 10:1, port, pollish, big cam and I would do it with a shaved down P90 head. Remember horse power is all in your head!

I hope this helped.

Matt-

P.S. How much was the labor for nissan to rebuild the L28? I must have been more than the $2800 for the parts. Just wondering?