Can a 400 Crank Give My 350 a Boost?

Performance & Modifications
1

I’m diving into a project that involves swapping a 400 crank into my 350 engine block and I could really use some insights from those who have done it before. It’s a bit tricky since I’ve heard mixed things about compatibility and how much modification it really involves.

Here’s what I’m thinking:

  • Is it worth the effort? What kind of performance gains can I realistically expect?
  • What modifications are necessary? Are there machining steps needed for the crank to fit? What about balancing – is that a must?
  • Unique challenges: I’ve heard some say that oil flow might be an issue. Has anyone faced this?

Any personal experiences or tips?

If you’ve tackled a similar swap, I’d love to hear your thoughts on:

  • Any hurdles you encountered.
  • Recommendations for parts or mods.
  • General advice for someone who’s moderately skilled but still learning.

Thanks in advance for any help – looking forward to hearing your stories and suggestions!

3 Likes
2

Switching to a 400 crank can definitely give your 350 a boost in torque and RPM potential. Just make sure the rod lengths and piston compatibility align for best results!

3

That’s great to know! Are there any specific parts I should watch out for when making this switch?

4

Yes, consider using high-performance aftermarket pistons with the right compression ratio. It’ll help maximize that crank’s potential!

5

What about tuning? Do I need to adjust my carburetor or fuel injection system?

6

Absolutely! Tuning is crucial. A re-jet or an ECU flash will optimize the air-fuel mixture for the new setup.

7

This sounds intense! Is there a reliable shop that specializes in this type of work?

2 Likes
8

Check with local performance shops. They often have the experience needed to ensure compatibility and reliability with your engine upgrade!

9

I’ve seen some impressive results when folks combine a 400 crank with a well-matched turbo setup too. Makes for an insane boost!

10

Haha, that sounds like a wild ride! But isn’t that a lot of extra maintenance?

8 Likes
11

Yeah, it’s true! More power often means keeping a closer eye on everything, from oil to tuning. Worth it for the thrill!

12

I love a good thrill! What about headers, should I upgrade those too?

4 Likes
13

Definitely! Upgrading to headers will improve exhaust flow, which is essential when you’re boosting performance!

14

Awesome advice! I feel more confident about this upgrade now.

2 Likes
15

Just remember to have fun with it! An upgrade like this should be exciting, not just about numbers!

16

I think using a 400 crank in your 350 can definitely provide a bit of a boost, but you have to consider compatibility. Make sure to check the stroke difference!

17

That’s a great point! You also might need to customize your pistons. Will this modification impact your compression ratio?

2 Likes
18

It’s important to note that you may face some challenges with alignment, so getting the right spacers and checking your oil clearance is crucial.

19

I had a friend who did a similar swap. He had to modify the oil pump too. Don’t underestimate that aspect!

20

Good call, @morrisharry! Plus, make sure to check if you’ll need any additional machining on the block or crank to fit everything snugly.