So I chose 1/24 over 1/25 for a specific reason, I use 1/24 engines in 1/25 as they just plain look better. Nothing gets big American V8 better than a slight upsize. Now I can do 1/25 but the difference is so minimal like 1-2mm in length difference, to me its not worth the hassle but I will do it upon request. I did have a customer insist on it on my 1st gen hemi, he liked it and wanted a second, I asked him to take the risk on just getting a 1/24 with the assurance I would send him a 1/25 if he was unhappy. He ended up liking the 1/24 better and has stuck with that since then. Like I said I am not against it, but even with the 1st gen blown hemi which is one of the larger engines I do its not much. The only engine I could see making a significant difference is the 6BT 12V Cummins, because that thing is gynormous. For reference an LS block is 24" long a Flathead is 30" long the 6BT is 40" long, these are all 1:1 sizes.