H P rating for Allison GT-20

[J.R.]

what is the most h/p that can be safely bolted to an Allison GT-20?

[petehubbell]

I've seen one with a 2.5 280 and some nitrous before....I'd say as much as you can put on there. Go for it! Pete

[Michael J Giesler]

I saw one with twin sst mod u 2.0 liters

[Erine]

rated for 135 on the plate. 260 on mine.