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Hello everyone, I have a 1972 400 HP motor with a cast crank and 346 heads (double springs). I thought about doing a stroker (451 - with a 440 crank, or a 440 source kit, but I do not think I need to rebuild the engine). I would like decent power - maybe 350 HP and 400 TQ. More the better, but...

Thank you. I ended up buying it. You are right. The engine is a HP stamped 400, so they do exist. Just an FYI

Thank you for the story! I will have to say that there was a long delay with my car and its engine. Lol

You are not wrong here. I had no option of an original engine, so I went with one that was close.

Thank you! I did end up purchasing the engine. The cylinder walls look to be in great shape. I am trying to keep it low budget, so I can get it into my car faster.

You are right. They did.

Mine is a HP motor. It is a 400. I hope this helps.

You are right, it came out of a 72 Charger.

Agreed. Thank you

Yes, I think you are 100% right. I like the motor and its price. Apparently, it ran before it was pulled, and it has been stored inside.

Thank you Lefty.

Thank you. I did not know that they were built so quickly after assembly. That is cool.

Hello all, I have a 1973 Roadrunner that was built on 9/20/72. It is a 400 4 Barrel/727 car. The original 400 is missing. I want to get a date/period correct 400. I am looking at a 400 that was casted on 3/30/72. It was assembled on 4/18/72. Is this too much of a time gap? What is an...

You are right. I will do that. I am sure they are helpful at those places.

I think I will be. I have only driven the car for probably 20 minutes. Right now it has a 1968 model year 383. I think it is the one with 9.2 compression.

Thank you for the help! I will look into those convertor brands. I will try to figure out which convertor is the correct one for my situation.

Yes, I like having wider tires. I think they will look nice. I am fairly certain the car has its numbers matching transmission. I am not sure about a lock up vs a non lock up convertor. I need to look into that. The car has a 3.23 suregrip with a 489 case. I am happy with the gear ratio. 3.23...

I have some 17 inch Year One Magnums that I plan on using. I am not sure exactly what tire size I will be using. It is a staggered setup with the rear wheels being 1" wider. Maybe I will go with slightly larger ones in the rear. 727 automatic transmission. I am not sure about the stall...

Sorry for the confusion. I would like a street-only motor with good street manners and solid power. I am no expert, so I am still learning about building an engine. This post and forum have been very helpful. I like the idea of 1HP per cubic inch. I think that is reasonable. I have read...

Thank you! I will look at your profile to find your posts. I am interested in reading about what you did. A 400hp 400 would be nice.