Sweeeeeet Are M4 ones the same as 425 feed pipes?

do the pipes run from the oil cooler to the heads?
have you got a set for me to copy?

I can nab a set off my spare 425 if you want?

cool !
PM sent

Russ there's a spare set of M4 ones in the barn on my spare M4 if you want to do a quick comparison.

They say M4s are big bore 425s (I'd like to compare the innards). Certainly the barrels are the same, just bored out for the 602, so if the heads are of a a similar physical size I'd have though that the pipes would be similar length?

I guess we shall see...

First time I've seen a naked Visa unit. Are they black as standard?

A friend and I did something similar in a 602 engine we're renewing.
Except we used materials easier to work with (copper, brass and tin), then galvanised this to match all renewed bolts etc. I also went for oring seals to "save" some height because I had to make the joints slightly bigger (in diameter for a longer contact surface between pipe and joint body, and higher for a slightly thicker pipe). Due to that, I had to grind and smooth the attachment spots on the heads so the oring would sit flush and compressed. Totally works

wow looks good

i ran off a few when the new ones available would only last about a year on a road car and less on a racer the thin steel just seemed to fracture so i made some to get my car going over a weekend

I was a little uncertain about the materials, what you used is tougher (and looks better "raw"), but it seems to be fine.

ive used copper too as i was unsure how copper nickel behaved when heated cherry red - seems fine it also has a bigger bore than the copper and so carries more oil