As the the title. What is the actual difference between Twin Turbo cylinder heads 40P-1L and 40P-2L. I know Series 2 engine heads were 48P. Can you mix 1L and 2L.
I've seen heads with casting number suffixes of 1L, 2L & even 2R and I have no idea what they signify. I'm pretty sure the 2L & 2R were 30P or 10Y heads (NA) so I always assumed the 1L was 40P or 48P (TT) ....... but you've just tipped that theory on its head It's hard to imagine that even Nissan would go to the trouble of changing a casting number unless there was an alteration of some sort
I've had all the casting suffixes but always both L & R heads were the same on engines I've had or worked on. Its just someone I know had a 1L and a 2R fitted to same engine both 40P. I was just curious. Thanks for your reply
