You are saying that the 4G-63 T engine handles more power than the 420a? I hope you are ready for a debate. Both engines can't make over 400HP without building the block so I think why start with something older when you have the newer 420a. Do you know what kinds of mods you need to make HP in the 600HP range because BOTH engine need the same amount of work when you start entering that arena. So why pull a good motor (420a) and spend 3000 on a good reputable engine(4G-63T) when that 3000 can go into your original. In the search for serious power using the 420a is the only choice. There are other issues like getting the ECU for the factory turbo motor and changing the mounts labor and Crankwalk. All that can add up to another 2000-3000 dollars.

On top of that a GST has to be pushing about 270HP just to keep up with a stage 1 420a. Maybe you don't believe me, but I owned a 1G and could bairly keep up and I don't have to begin talking about all the stage 1's that are just moppin' the ground with 4g's. The 420a powertrain/drivetrain uses shorter gears and can spool a turbo quicker. Ask some of the 4G-63T owners who actually complain about lag on a 16G then talk to Chris M.(one of many obligatory names). Or a T3/T4 which can hit max boost in under 3300rpms(and that isn't the BB either). Anyway I'm not saying the 4G-63T engine is no good - it is! Just that is serves a different purpose for a lot of people and that pulling your 420a for some real power is taking the wrong road. Currently HRC's 420a is making ~500HP off of boost and their other 420a is lighting the tracks with 600HP.

Skrilla
'97 Base Talon NA
"Technology: The Only Replacement for Displacement"
"Peace and Turbo Grease"

*Skrilla
"Honest officer, I thought you were trying to race me"
Talon: 1st 2.4L
'97 Prelude
'04 350Z

Originally posted by etx
Good luck man! Project 'STFU Brian your talon is dead meat' should be on it's feet soon!