Rocket 350 vs. Chevy 350; What’s the Difference?

According to what I’ve observed and experienced, there are noticeable differences between a stock 350 Chevy from the 1970s and a stock 350 Olds from the same era. Perhaps not in terms of horsepower, but torque is a different story. 

And torque gives me a smile. Horsepower is for top end and drag racing, but for me, those times are over. My only concern is having good street manners, and I’m willing to wager that my stock olds in a Gbody will beat a stock Chevy motor eight days a week. 

Typically, a truck’s old motor replaces the diesel engine. It is less expensive than changing the diesel. Additionally, the diesel block is based on an old’s motor, so it bolts to the tractor. Tranny to motor bolt patterns differ between Olds and Chevrolet motors. The cost of purchasing adaptors to connect an old truck to a Chevy is higher.

However, you can convert an entire old’s motor or truck into a Chevy. Different wiring specifications apply to Olds. On the other hand, is the starter.

Table of Contents

In this article, we compare the Rocket 350 vs. Chevy 350 with all the information you need to know. I do this with my own experience and what I have learned from the internet. 

How to identify a 350 rocket engine?

Oldsmobile V8 Engine Information & Casting Numbers

Olds used the same block casting for all 350 motors from 1968 to 1976, and the number above the water pump is simply the block’s casting number. 

The casting number was altered in 1977 along with the 350 casting in order to make it lighter. 

Not the casting number, but the VIN derivative on the block must be found to determine the precise year of manufacture.

How much is a 350 rocket engine worth?

Thus, the majority of people estimate $250 or so. but I’d travel a thousand miles to get one. So, regarding the $250, I must disagree. 

Even though $1200 may seem excessive, I have seen heads sell for more than $250 when they weren’t even #5 heads.

Is a 350 rocket a big block?

Edelbrock VS Iron – Rocket 350 on the Dyno!

An SBO is the 350. (small block olds) SBO are 307, 330, 350, and 403. All three BBO (Big Block Olds) models are 400, 425, and 455. Dude, get the Chebby out of the OLDS! I currently have an Olds 307 in my 1987 Camaro. Visit for useful information like that. Lots of information there.

Look at the number on the left (driver side) head IF you get an SBO 350. If it is 8, it is a smog head, which appears to be very common and only has about 180 horsepower at the factory. You want a 5, 6, or 7A in the heads column. great head, and it produces power.

Compared to the 8 head, you can gain at least 50 hp with a simple head swap. What I like about an old car is that a great engine can be created out of a junkyard. If you know the combination, you can find some good numbers, though it might take some searching.

Chevy Traverse Traction Control Off; Must Read.

How to identify the Chevy 350 engine?

  1. Go to and note down the number. Research is simple because MorTec has a list of all casting numbers available.
  2. A second casting number can be found on the back of the block. Not all blocks have this number, but if they do, it will indicate the engine’s displacement. For instance, a 5.7L code denotes a 350-cubic-inch engine.
  3. Take a look at the block’s front, directly in front of the valve covers. 
  4. On the driver’s side of the block, there is a metal pad with a number sequence etched into it. If required, use a wire brush and degreaser to clean the pad.
  5. Look up the code on the MorTec website after writing it down on paper. 
  6. Additionally, MorTec has reference codes for the front block numbers that reveal the plant where the block was made and the type of vehicle in which it was previously installed.

Chevy 350 engine specs.

  • The 350 cubic inch (5.7 liter) small block V8 engine in the Chevy 350 has a bore and stroke of 4.00 and 3.48 inches. 
  • HP ranges from roughly 145 to more than 370 depending on the year, make, and model of a car. 
  • This engine, which has a maximum torque rating of 380 pound-feet, is excellent for towing but has poor fuel efficiency and may need premium fuel depending on the compression ratio.

What is the horsepower of a Chevy 350 engine?

It has a 4.00-inch bore and 3.48-inch stroke and is a small-block, V8 engine rated at 5.7L (350 cubic inches). 

This engine can produce between 145 and 370 horsepower, depending on the year, make, and model of the vehicle it is installed in.

How much does a Chevy 350 engine cost?

A 350 Chevy engine rebuild typically costs around $2,000. Nevertheless, this cost may increase by $3,000 to $4,000 depending on the replacement parts you choose.

Rocket 350 vs. Chevy 350; What’s the Difference?

How many miles per gallon does a 350 engine get?

A standard short bed, 350 half ton truck that is carbureted (it matters) and has gearing that allows you to turn at 2200 rpm or less will get about 16 mpg on the highway at 65 mph.

How much does an engine swap cost?

In addition to anything from $500 for a short block engine to $9,000 for a complete, high-performance engine, you should prepare to spend between $500 and $1,500 on labor. 
Keep in mind that you could also need to pay for other components to finish the block, depending on the sort of engine you choose.

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