For tractor pulling the 400 will meet it's structural limits and fail sooner. The 366 is made from the git-go to work hard in big trucks and busses, the 400 was meant to move station wagons for less cost than a big block option.I was wondering which engine would be more powerful. I know the 400 has more displacement, but I've also heard that the 366 creates more power at lower rpms... I'm looking for maximum torque, which one would be better?
The 191 head was used on heavy duty Swirl Port 350's they are configurationally similar to the the 193 but use a larger 74-76 cc chamber volume to reduce compression from the 193's 64-66 cc chamber. Compression is easily restored to 193 levels by using a flat top piston with the 191 head.Double Vision - is there any difference between the 193 casting heads and 191? cause I actually have a pair of 191 heads on an old truck. I was curious as to why you suggest a two barrel carb? I know someone who has an aluminum intake with a holley 4 barrel. not sure if it is dual plane or not but how would this perform? Thanks for all the advice! I don't plan on revving it above 3500 so I like this combination