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Big block build what the compression ratio was and what octane fuel?

Tiny
TMSNYDER2015
  • MEMBER
  • 1979 GMC C2500
  • 7.4L
  • V8
  • 4WD
  • AUTOMATIC
  • 180,000 MILES
I have never built an engine before, and I have a 454 I plan on building a building very similar to the big block build video. I was wondering what the compression ratio was and what octane fuel you run on the build. Thank you.
Tuesday, October 1st, 2024 AT 5:33 PM

3 Replies

Tiny
RYAN L
  • ADMIN
  • 256 POSTS
Hey there!

Thank you for watching the series! So, on my big block I was running about 10:1 so I could run 91 pump gas commonly found around where I live and be fine. In my opinion anything 11:1 and below is fine for 91-92 octane. I had a LS that was exactly 11:1 and I ran that on 91 all day it was really good.

If you have any other questions, please let me know. Thank you for using 2CarPros!

Best,
Ryan
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Wednesday, October 2nd, 2024 AT 9:27 AM
Tiny
TMSNYDER2015
  • MEMBER
  • 2 POSTS
Awesome! Thank you and thank you for the videos. Never would've dreamed of restoring my own vehicle and your channel gave me the confidence to go out and do it. Keep up the Awesome work!
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Wednesday, October 2nd, 2024 AT 9:32 AM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,513 POSTS
Our pleasure, let us know how it goes or if you need anymore help.
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Thursday, October 3rd, 2024 AT 9:40 AM

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