I understand the point you are standing by Rob. Plus, you are probably right that no one here will buy that head. However, if you are saying that the Datsunworks head is not L-series development, then are you applying the same criteria to the OSG head? And any other aftermarket performance oriented developments? Youre saying using a diesel crank disqualifies it from being l-series, despite being from an 'L'D28 engine and the type of mod done since the 70s, in Japan, by dedicated L-series tuners? There's historical precedent on the Honda connection too btw; guys in Japan used the FT/XL500 bike piston to achieve 89mm bore with modified L14 rods and LD cranks in the 1970s. And yes, we do like classic engines, but the Ls have been modded heavily for 40+ years. It's part of their DNA almost. The original TC24-B1s were 1980 vintage. Surely that qualifies them as classic? Most of these mods have been conducted in one variation or another since the cars/engines were new. Is my to-be-assembled 3.1 not an L-series because it has a custom steel counter-weighted crank? I guess I might win some points back by having Nissan Competition rods to offset the deduction! This is definitely drifting off into the realms of opinion about what qualifies as what now. Reminds me of why I'd been avoiding posting about the Datsunworks head. Time to cut and run!