cesar.r.burgos
Active Member
i was just wondering how much power can i really pull out of a 225 slant 6 in my 72 demon... where can i find parts for it and how much is it going to run realistically....
i was just wondering how much power can i really pull out of a 225 slant 6 in my 72 demon... where can i find parts for it and how much is it going to run realistically....
i was just wondering how much power can i really pull out of a 225 slant 6 in my 72 demon... where can i find parts for it and how much is it going to run realistically....
i was just wondering how much power can i really pull out of a 225 slant 6 in my 72 demon... where can i find parts for it and how much is it going to run realistically....
I'm right at the beginning stages of a long rod 225 buildup now. I think 250 HP from a naturally aspirated slant is a stretch........for a STREET driven slant, but it certainly can be done and then some. They just get really radical at that power level and above. I am giong to be perfectly happy with whatever mine ends up being. I project 200-220 HP. And that will be snappy in a 2650 pound 1963 dart with a 4 speed overdrive and 4.30 gears. Something fun to drive is what I am after. If it gets too radical, it will be fun to drive only for a short time....then it will become a chore.
I'm right at the beginning stages of a long rod 225 buildup now. I think 250 HP from a naturally aspirated slant is a stretch........for a STREET driven slant, but it certainly can be done and then some. They just get really radical at that power level and above. I am giong to be perfectly happy with whatever mine ends up being. I project 200-220 HP. And that will be snappy in a 2650 pound 1963 dart with a 4 speed overdrive and 4.30 gears. Something fun to drive is what I am after. If it gets too radical, it will be fun to drive only for a short time....then it will become a chore.
SS will you let me know so I can follow along?
I sure will. I suppose I should get a thread goin now because I have the block, pistons, and some of the head work done. I am using stock 318 1.74 and 1.50 valves. I finally found some 198 connecting rods at a price that didn't require me to hack out my left nut with a dull rusty knife. Thanks Frank!!!! So, I will be addin a thread pretty soon. Gotta get some pics first and I will get the thread up in a day or so. I'm stoked. It's gonna be fun.
why did you go so big on the exhaust valve? 1.44 would be plenty...
The 302 cubic inch 1968 Chevy Z-28 has virtually the same per-cylinder displacement as a 225 /6. (225/6 = 37.5; 302/8 = 37.75.)
Chevrolet saw fit to put 1.6" exhaust valves in those motors, and we all know how those engines run.... Bigger valves USUALLY make more power.
why did you go so big on the exhaust valve? 1.44 would be plenty...
Just stock 318 valves. I don't consider them that big. lol
agreed but on you have to think of how much bigger of a port they were dealing with (and a 2.02 intake??)...
!
I'm right at the beginning stages of a long rod 225 buildup now. I think 250 HP from a naturally aspirated slant is a stretch........for a STREET driven slant, but it certainly can be done and then some. They just get really radical at that power level and above. I am giong to be perfectly happy with whatever mine ends up being. I project 200-220 HP. And that will be snappy in a 2650 pound 1963 dart with a 4 speed overdrive and 4.30 gears. Something fun to drive is what I am after. If it gets too radical, it will be fun to drive only for a short time....then it will become a chore.
Have you ever seen the exhaust port on a 327 small block Chevy head?
I'd be surprised if it's ANY bigger than a /6 exhaust port.
I don't think it is. The intake, yes, but they had 2.02" valves to feed...