420A GST/GSX radiator swap into 2GNT

[Eclispe Rs]

Not too sure how many people have done this but as far as YouTube goes I searched a bunch of videos no one has done it. I’ve been reading on this forum and no one has done it. Maybe a couple of people in garages that just wanna keep it a secret, but I did a missing Moto radiator Fan and Strouds with the Missy Moto radiator hoses which are flexible and made it work for a 420 a also gates thermostat I’m testing the waters and if everything goes good with this one, I will be switching to the smaller radiator with only one fan and it will be koyorad

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[jdxnc]

What's that hose made of? It's literally laying on your header, metal or not, that's a leak in the near future.

 

[BLACK'98DSM]

It's been installed many times before. Maybe not heavily documented, but I've definitely seen and heard of it a few times.

Normally what people do is install a Dodge Neon plastic water pipe which is quite a bit shorter and allows you to use the GSX lower radiator hose. You have the right idea with the upper radiator hose. But could remove some more length to bring it away from the header. Using fiberglass wrap on the header is also a good idea regardless of hose routing.

 

[Eclispe Rs]

It's been installed many times before. Maybe not heavily documented, but I've definitely seen and heard of it a few times.

Normally what people do is install a Dodge Neon plastic water pipe which is quite a bit shorter and allows you to use the GSX lower radiator hose. You have the right idea with the upper radiator hose. But could remove some more length to bring it away from the header. Using fiberglass wrap on the header is also a good idea regardless of hose routing.

Thank you I appreciate it and I do need to buy wrap any good recommendations and I need to wrap the radiator hoses to make for cooler hoses ima go high compression all motor build 300 hp

 

[BLACK'98DSM]

I don't think you'll reach 300hp naturally aspirated. Not being a downer or saying it's impossible, but you probably don't understand what it takes to get there. The most powerful naturally aspirated 420A to be recorded was a bit North of 200whp. And that car was not streetable. If you can engineer and pioneer your way into totally custom parts and equipment you might reach 250, but we're talking serious money and research to get there.

I'm not sure about the health of your engine or the total extent of your current modifications, but you've pictured a car probably making 120whp if it's healthy.

 

[miliman13]

Thank you I appreciate it and I do need to buy wrap any good recommendations and I need to wrap the radiator hoses to make for cooler hoses ima go high compression all motor build 300 hp

All motor + Nitrous? or some other neat energy dump? If you're going to build the motor, I'd recommend just boosting it... its tons of fun and the power is plentiful.

 

[Eclispe Rs]

All motor + Nitrous? or some other neat energy dump? If you're going to build the motor, I'd recommend just boosting it... its tons of fun and the power is plentiful.

I would boost but I also have a 95 gsx boosted and I want one all motor and one boosted that’s why but should I bore out or sleeeve

 

[BLACK'98DSM]

Don't worry about boring/sleeving etc. That's not where you gain power with these engines. The service limit bore size is 3.505", which is a 0.060" overbore from the factory 3.445" cylinders. At less than 1/10th of an inch, that isn't going to net you anything and would deem the block non serviceable. I normally bore then in increments of 0.020" to get multiple uses from a block.

The 2 things you need to focus on are tuning and airflow. The stock ECU is a paperweight and the cylinder head leaves a lot of flow to be desired.

 

[Eclispe Rs]

Don't worry about boring/sleeving etc. That's not where you gain power with these engines. The service limit bore size is 3.505", which is a 0.060" overbore from the factory 3.445" cylinders. At less than 1/10th of an inch, that isn't going to net you anything and would deem the block non serviceable. I normally bore then in increments of 0.020" to get multiple uses from a block.

The 2 things you need to focus on are tuning and airflow. The stock ECU is a paperweight and the cylinder head leaves a lot of flow to be desired.

Okay, and yes, I’ll most likely do that. I’m thinking of going hal tech or mega squirt. And then making it a high compression motor I found a place to do CNC boarding and Custom Intake Manifolds fuel rail and throttle bodies plus I’m going to have to make a Custom Intake custom headers and exhaust and I’m pretty much doing the piping for the headers and exhaust 2 1/2 because I feel like a 3 inch will be losing horsepower at that point.

 

[chrisman287]

You should’ve used a 1G radiator. The upper neck is more towards the passenger side. You might have been able to use a GST/GSX upper hose.

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