Which is better engine combination, 383 4bbl or 400 4bbl

GTX JOHN · 01-31-2011, 01:03 AM

We have raced both over the years.......we now (Robbies Roadrunner) run 400 combo. Do not see a lot of flow difference between 906 and 452/346 Heads. BIG difference between small AVS and large thermoquad (really any thermoquad) that is legal on 400. I have never seen a 400 combo that is not FAST from start! I have seen quite a few 383's that the guys have struggled with, although I know a purple '70 383 that is real fast up north. Let me know if I can help on either one. Racer7411@yahoo.com

01-31-2011, 01:03 AM	#5
GTX JOHN VIP Member Join Date: Jun 2009 Location: Boulder City, Nevada 89005 Posts: 2,732 Likes: 2,798 Liked 2,479 Times in 697 Posts	Re: Which is better engine combination, 383 4bbl or 400 4bbl We have raced both over the years.......we now (Robbies Roadrunner) run 400 combo. Do not see a lot of flow difference between 906 and 452/346 Heads. BIG difference between small AVS and large thermoquad (really any thermoquad) that is legal on 400. I have never seen a 400 combo that is not FAST from start! I have seen quite a few 383's that the guys have struggled with, although I know a purple '70 383 that is real fast up north. Let me know if I can help on either one. Racer7411@yahoo.com