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Engine/Performance

Mopar engine and performance questions submitted by our readers and answered by our technical editors.

Sick Six

I rebuilt my ’70 T/A’s 340 Six-Pack engine a while ago, and it’s never run right. Everything is stock, except the cam is a purple shaft 0.484˝/284°. I've put about 2000 unhappy miles on the thing thus far. The carbs were rebuilt, but the

Port Power

I would like to know if there will be any benefit to port matching my headers to the exhaust ports of my ’73 Challenger’s 360? There is a big stepup. Here’s the engine specs: fresh mild 360 with Erson Hi Flo cam (2700‑5800) and heavier

New Twin Turbo I-6

Stellantis unveiled its new 3.0-liter Hurricane Twin-Turbo inline six-cylinder engine that delivers better fuel economy and fewer emissions than larger engines while at the same time generates more horsepower and torque than many naturally

Neon Nightmare

The head gasket blew on my '97 Neon twin cam engine). I replaced it, usingone of those new layered-steel gaskets. Ialso had the head shaved a few thousandthsat a local machine shop. I have the book andthe instructions that came with

Dart By Degrees

After many years of searching through bookstores for your magazine, my wife finally bought me a subscription. I kind of miss the bookstore.I have a 1963 Dodge Dart GT Convertible which is in very nice shape. It has a 225 slant six, and I

Trailer Travails

I purchased a ’99 B1500 “shortie” with the 3.9L with only102K on it thinking it would be capableof towing my 7x12’ single axle landscapetrailer and get “reasonable” fuel mileage.Well…what a mistake. The damn thing hasnever gotten over 15

Liquid Gold?

I am working on a retro install of a6.1L/545RFE into a ’68 Charger. I was wonderingif you have had any experience withthe Evans waterless coolant? From whatI’ve read, it does a better job of cooling,doesn’t build up any pressure or

All Decked Out

I have a 1964 383 4-barrel motor with the518 Heads. I would like to know what theCR would be with a zero deck height. Themotor is bone stock.Usually, CR “guesstimate” questionsare dismissed out of hand by me, becausethere’s a bunch of

Barred Boring

I need your knowledge and wisdom.I picked up an industrial “413-1˝, withthe 2658836 block casting, the forged steel6-bolt crank, etc.I’ve heard that these are 426 wedgeblocks, underbored to 413. I’ve also heardthat they may be thick enough

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