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on the O.S .21TM-How much a difference is it between that and the trx3.3? I've read that the 3.3 is a .20 therefore would it be a big difference over it or would it just be a huge performance and tuning difference?IMO BB conversions are no good because you will have to buy hole new drive train including axles,diffs,the hole tranny, etc,etc,etc...Its just not worth throwing that cash into a tmaxx. You will be replacing more and more parts with a big block then you will with the stock TRX engine. You're better off just getting a o.s. .18 or o.s. 21TM.
on the O.S .21TM-How much a difference is it between that and the trx3.3? I've read that the 3.3 is a .20 therefore would it be a big difference over it or would it just be a huge performance and tuning difference?
Ohhhh.really.For one its a OS engine and is WAY better.
But aside that the top end is about the same. However the 21tm has Gobs more low end then the 3.3. Hella easier to tune as well.
Just do a search on "big block maxx" and you should find a bunch of reasons not to do it.
Picco BB mount? I'm not familiar with that. I believe picco does make a mount, but it's for their specific maxx/revo engine, not for "any" big block.
and a bunch of reasons why those that do, enjoy it.
You won't find many of those with my name near it... did it. Sucked. Works out well if you spend 4 times what you should.
Then again... aren't most hobbies stupid expensive if done right?