logic23 Posted June 16, 2015 Share Posted June 16, 2015 does anyone know where to find out the specs on different year 2.5 engines? need to know whats compatable between different year 2.5 lower ends. Trying to build some engines out of several bad ones. thanks Quote Link to comment Share on other sites More sharing options...
Fairtax4me Posted June 16, 2015 Share Posted June 16, 2015 Only good place is to look in the service manuals for those years. Most things (crank, rods, pistons) swap freely from 96-98 in the 25D. These will not swap into 99-later blocks. Pistons might, but not totally sure on that. 99 - later, the biggest change was with the crank, the thrust journal moved, and the rod bearing journals were bumped up from the 48mm to 52mm. That stayed mostly the same for about the next 10 years. People swap crank, rods, pistons from STI 255 turbo blocks into the 251 and 253 blocks fairly regularly. Quote Link to comment Share on other sites More sharing options...
logic23 Posted June 16, 2015 Author Share Posted June 16, 2015 Only good place is to look in the service manuals for those years. Most things (crank, rods, pistons) swap freely from 96-98 in the 25D. These will not swap into 99-later blocks. Pistons might, but not totally sure on that. 99 - later, the biggest change was with the crank, the thrust journal moved, and the rod bearing journals were bumped up from the 48mm to 52mm. That stayed mostly the same for about the next 10 years. People swap crank, rods, pistons from STI 255 turbo blocks into the 251 and 253 blocks fairly regularly. I am building an 07 2.5 sohc... all the blocks i have are toast. Mainly trying to figure out if an 03 block and crank will work with the 07 pistons. Only good place is to look in the service manuals for those years. Most things (crank, rods, pistons) swap freely from 96-98 in the 25D. These will not swap into 99-later blocks. Pistons might, but not totally sure on that. 99 - later, the biggest change was with the crank, the thrust journal moved, and the rod bearing journals were bumped up from the 48mm to 52mm. That stayed mostly the same for about the next 10 years. People swap crank, rods, pistons from STI 255 turbo blocks into the 251 and 253 blocks fairly regularly. Quote Link to comment Share on other sites More sharing options...
Fairtax4me Posted June 16, 2015 Share Posted June 16, 2015 I think that should work fine. Bore and stroke are the same at 99.5 x 79.0mm. 1 Quote Link to comment Share on other sites More sharing options...
logic23 Posted June 16, 2015 Author Share Posted June 16, 2015 I think that should work fine. Bore and stroke are the same at 99.5 x 79.0mm. Thanks brother, Ill check the manuals too. Quote Link to comment Share on other sites More sharing options...
ccrinc Posted June 16, 2015 Share Posted June 16, 2015 The one main thing to match on the block is the way your PCV valve mounts. There are 3 styles: a pressed in plain tube, a threaded tube and a sort of J-shaped mounting (California spec). Matching that will make your life easier. Other than that, I don't believe there are any major block differences. Emily Quote Link to comment Share on other sites More sharing options...
Fairtax4me Posted June 16, 2015 Share Posted June 16, 2015 PCV stuff can be worked around with various fittings, hoses, etc. If the block has the thread in-fitting, go to the dealer and get the PCV valve for that year, and get the hollow fitting that goes in the manifold to match. Quote Link to comment Share on other sites More sharing options...
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