400 BB MOPAR questions

[cbodybob]

Yes, but I'm just having fun on a budget. Maybe. I have 2 sets of headers I'll have to see, but I think they are 1 3/4

 

[RT K_line]

I have turned a 400 to 6500 on a regular basis with no crank issues. I also ran a cast crank with 6 pack rods and pistons up to 6500 rpms even hit 7000 a few times by accident when I had the tunnel ram on it. It pulled like it would go more but didn't want to risk it. Mopar cast cranks are really good.

 

[cbodybob]

Good info guys. I've heard the 400's where very tough engines.

 

[evilmopar]

I rev my .60 over 400 at 4800. It´s totaly dead above 5K even with a turbo and 12psi of boost on an all forged bottom end. Cool car you got!!

 

[cbodybob]

Thank you

 

[383man]

My brother ran a stock bottom end 400 before as it was the stock cast crank and reconditioned rods. He twisted it to over 6500 for a few years racing it as it was in his 3100 lb Duster and ran a best of 10.95. We have a 400 in my sons 72 Dart but we used a steel 383 crank and my son shifts it about 6500 and its still going strong. I will say my brothers 400 had stock pistons but he ran milled 915 heads at 10.5 comp. After 3 years racing it on the track it did have one of the stock pistons come apart but the cast crank held up fine. Ron

 

[cbodybob]

383man how much did he mill those heads to get that kind of compression ?

 

[383man]

383man how much did he mill those heads to get that kind of compression ?

Well he had decked the block and milled the heads but I will have to ask him how much as I dont remember. I will call him later today and ask him. Ron

 

[cbodybob]

Thank you Ron