Leaderboard

I am beginning the build of a GM Vortec 4200, also known as the ATLAS 4.2 straight six. it is all aluminum, DOHC, VVT on exhaust cam, makes 291 hp and 270 tq stock. Peak torque at 1800 RPM and hold it to 5000 RPM. A lot of these are being built on YouTube, etc., and I decided to build one. I will also be using the Aisan GM AR5 5 speed transmission which came in the 4 cyl ATLAS 2WD Chevy Colorado pickups. bolts right up and I will get a custom flywheel to work.

That is an interesting master cylinder set-up. I haven't seen that before. I assume that you will be running all new brake lines.

Cut out the indented areas & fabricate new sheetmetal to fill the holes. Personally I like the smooth look. 😎

It's not uncommon. I added a terminal post near the battery for a few things. If I had a bunch I'd probably just install an auxiliary fuse box. Otherwise you have a bunch of inline fuses to take care of. There are many out there but a trip to the salvage yard would probably find one that is weatherproof and high quality. Depends on where you want it mounted. Looks like I'm on the same page as jhm, who replied as I was writing.

Got the front coilovers and the dual master cylinder assembly on today. Still too hot out for working on the car here, I can’t wait until it cools down. A few challenges with each, but got it on right. Was hoping to start tearing down the rear, but I’ll give that a go next weekend.