building my engine (ideas)

[e_racer1999]

**also posted in hybridz

okay, i'm trying to find a really god combination for a street/autox car. i want decent power, but i don't need buttloads of torque. i have a 1972 240z (all stock) with the E88 head. i have a complete N47 L28 (1979) and i already have some ideas. i wanna know what you think!

okay, i'm taking the 5 speed and i'm keeping the R180 (LSD comes later) and putting 4.11 gears in it (good idea?). i plan on getting flattop or slightly domed pistons and using the crank and rods from the L24 (i know you think this is going in the wrong direction, but i want revs!). will the L24 rods be good enough?

I also want to know which head i should use (E88 or N47). i know the E88 has better compression, but is limited by the ports/valves. is there a better head that i can get for not a lot of $$? any feedback is greatly appreciated!

-jason

btw - i plan on running stock SUs for the time being, until i go for a good camshaft (shoud i use L24 or L28 until i get a custom one?) and a good intake system.

[Bambikiller240]

I have you checked to see what mods are allowed in the class you plan to race in? Just thought I'd ask.

[Inf]

... i have a 1972 240z (all stock) with the E88 head...

...i plan on getting flattop or slightly domed pistons and using the crank and rods from the L24 (i know you think this is going in the wrong direction, but i want revs!). will the L24 rods be good enough? ...

...is there a better head that i can get for not a lot of $$? any feedback is greatly appreciated! ...

I'm pretty sure your 72 motor should already have flattop pistons

Being a 72 240z, I think your motor will have the 8mm rod bolts. Phred(I think) has suggested that if you are gonna be building a motor that had 8mm rod bolts, go ahead and get the ARP 8mm bolts because they are actually stronger than the original 9mm bolts that came in later L-series motors. I've seen a lot of people building stroker motors looking for L24 rods that were originally equipped with 9mm bolts because they were supposedly stronger? I would probably take Phred's word above others because he is our resident engine building guru.

A lot of people going for an N/A buildup seem to lean towards the N42 head as being the best all around (short of shaving down other heads like a p90).

You will find a lot of valuable info by searching the archives. These questions have come up in the past in some shape or form over the years.

[e_racer1999]

I have you checked to see what mods are allowed in the class you plan to race in? Just thought I'd ask.

not yet... i still haven't figured out which class i want to race in...

I'm pretty sure your 72 motor should already have flattop pistons....

i know, it's just that with the L28 block the bore will be too large for the L24 pistons... anyway, i'm gonna take your advice on the bolts and read up some more in the archives..

thanks!

-jason

[e_racer1999]

okay, i've decided (due to recent developments) to stick with the L28 crank and N47 head... with flattop pistons of course!

-jason