408 vs 427 stroker kits

afr 205`s on 427 cubes, man you got better heads on a stock 429 than that.
You need to start with 225`s

I'm planning a 427W build of my own. You can get the one with a longer stroke or the one with less stroke but a big bore(cubic inches still add up to 427 tho). I like the big bore version. I like to be able to rev higher. I want my shift points to be around 6800-7000rpms. I think AFR 225s are what I'll need but I'm not sure. The 205s might give it more low end power tho. Thats one of the things that kinda has be wondering about the combo I'm planning.

408 with 205s has a ton of potential too.

ok-now explain why the 225's? better heads on the 429? the 30 year old ports w/ the boss in the exhaust. Quote
Well both engines are 425+ ci the 429 has 2.09 valves and i think 1.65 so your allready over the 205`s. If you have not cleaned up the ports on the 429 heads you should have.
The 429 has less shrouding around valves because of the 4.369 std bore. If your going to buy after market heads for the 427w why would you not for the 429, I think the weight difference would be the only draw back.
I had a 66 fairlane with a 68 t bird 429 in it mild cam some bolt on`s little home port work and it ran best of 11.49 with the heads they have nowdays easy 10`s

Any much bigger than 408 with a standard bore (4.000-4.040) and you start to have excessive rod angularity which is frowned on by engine builders for reliability and parts longevity. Most of the research I've done says that rod/stroke ratios should be in the neighborhood of 1.55-1.6 or larger to avoid excessive rod angularity and the increased load on components that comes with it. A big bore (4.125 bore, 4.000 stroke, 6.250 rod) 428 with a R/S ratio of 1.56 would be a good idea.