260DET

Hard to go past the original race cars, particularly the rear quarter. Some of the detail is not that great but the over all shape, mmmmmm.

LOL Love it.

Nice work, opening up those vents helps cooling considerably. With mine a angled flap was placed in front and the rest left open, cooling problem gone.

You did look at the date, that item would not be available now, the best reference for sports option parts still available for the S30 I've found is NISMO US.

Upload your videos to Youtube then link them here.

For my purposes only performance above 3500 is relevant. As it is now, more acceleration above 5000 is required so a cam change is next. At this time no other modifications are contemplated because all the indications are that the right cam/header combination should do the job.

Bloody music, it looked like a great video but....... This is my favourite, John Morton at 76.

Engine angle is relevant to tail shaft alignment, I suggest that is the most important consideration particularly to avoid vibration and excessive wear. Practical considerations are always relevant but doing the job right should be the first priority, after all after all the hard work and expense you want something that drives like a new one.

Be interesting to know why the HSV/Z28 headers went with a more complex 1-3 2-4 plumbing arrangement, it would be more expensive to make than the usual 1-2 3-4.

Decided to play it safe, particularly as space is largely an unknown at present , so I've decided on a set of used HSV headers. They can always be replaced without losing much if power is not satisfactory. No luck on LS1 Tech, pic of HSV's..

In AU there are two options if you want to race a Z, both are expensive. One, we have Historics (Veteran in the US?) where Porsches are allowed bigger brakes and wider wheels, two, time attack lol. Sedans rule here, particularly V8 Supercars. So you see where I'm coming from.

Steel ones are available unless you really need f'glass. Shipping cost is going to to be more relevant, get quotes from each seller to compare.

Ten mm clearance is a great clearance rule of thumb for everything, get that engine back and handle the consequences like you know you can.

LS3 into a Z31 auto race car project, I'm a simple man but realise that a can of worms is the popular design model for 'race' headers. But I like the look and practicality of the good block hugger designs, particularly where there is not much difference between the pipe lengths, the collectors look like they perform a useful function just like with the more complicated ones. So what's the go, have we some proper power comparisons here, will just a few horses be lost or will it be significant? Stock engine except for a yet to be decided upon medium cam.

You Murricans still have some great racing opportunities for your Zeds, compared with the rest of the world.