Mailbag: Recommending Parts for a 350 Engine Swap into a ’66 Chevy II SS

[Image/Michael Barera, Creative Commons Attribution-Share Alike 4.0 International]

Q: My current restoration project is a 1966 Chevy II SS.

I need your help to pick out the parts I need for the engine.

The engine is a 350 LZ9 from a 1984 C-30 Chevy van. The carb will be a Holley 750 cfm with vacuum secondaries, the heads will be Edelbrock Performers with 64cc chambers, and it also has a 7-quart Moroso oil pan. I want to bore the block to .030 over and use one of your rebuild kits.

What compression is more acceptable for street use with pump gas—9.73:1 or 10.9:1?

For the valve train, I’ve already purchased some Crane Gold Race Rockers (1.50 ratio). I’d like to use a Crane hydraulic roller camshaft (I’m looking at the CRN-104224, 214°/220° duration at .050 inches, 270°/276° advertised duration, .452 inch/.465 inch lift), and COMP Cams roller lifters and pushrods.

What do you think?

I have a TH-350 automatic with a stock 10-bold rear-end and 3.08 gears.

Do you have any suggestions?

A: Sounds like a cool project!

We would recommend going with the 9.73:1 compression ratio on pump gas.

Here’s the rebuild kit for that ratio and standard size crankshaft.

The camshaft you currently have picked out is for a computer-controlled engine.

Instead of that, we’d recommend the following parts list:

We recommend stepping up to 3.73 gears in the back to complement this setup.

Good luck!

This is another in a series of weekly Q&A Mailbag sessions with Summit Racing’s tech department, in which there are hundreds more. Click here to see them all.

Tags: , , ,


  1. or you could just sell me the car. that would be the best swap of all! lol!

  2. Too much CFM carburetor… for this build, a 600 is just fine…

  3. What kind of oil pan are you going to use?

  4. You stated that you have a Moroso 7 quart oil pan, the unique K member of these early Novas requires a front Sump pan and special oil pick up. I do hope you have one that fits your chassis. Enjoy!

  5. No way should you move to 3.73 gears with a TH350 unless you are driving in town only. You’ll scream at 3k RPMs at 60 MPH. 3.42 is what I found best.

Leave a Reply

Your email address will not be published. Required fields are marked *


This site uses Akismet to reduce spam. Learn how your comment data is processed.