Hi all,
I am getting an Airtrek 4g63t , previously used Evo 7 GTA block.
Can any one confirm if these two engine blocks and internals (Piston,con rods and crank) are the
same strength wise ? Aiming for 550 whp.

 

Any one with some information on this ?

 

The rods are skinnier so it's not as strong. I don't have any proof to back this claim but I am sure someone will chime in with it. Otherwise, it's a cheap way to get a USDM Evo back on the road.

 

550whp is pushing a stock block HARD. Even an Evo 4G. Rule of thumb is 400lbs/ft is about the maximum "safe" limit for torque. You can push this envelope of course, but you're decreasing the life span accordingly. This might be fine for a long time on a weekend warrior with a large turbo to keep the torque to the higher RPMS. However, any way you slice it 550whp is going to expire that bottom end in a relatively short period of time compared to keeping it around the 450whp range. Of course there is a lot more that can be said on the subject, but I'll leave it at that.

 

I understand that . Now, is there actually any difference in Airtrek and evo7 block strength wise ?

 

Depends on the year. Some early ones use an older style of piston form an Evo 5 I believe. Others came with the newer Evo 7 piston. No oil squirters either, if that's a concern.

 

Are the internals the same in the newer 4G's in Evo 8s and 9s? i have had evos in my area lasting quite awhile on higher horsepower with stock internals (500-600whp) and just curious about it for my own. i had a subscriber mention this thread in a comment so i figured i'd ask you directly.

 

they do have squirters in the rods and the main caps

 

Are bare blocks the same strength? Evo vs airtrek?

 

People are running airtek blocks in their evo 8s successfully. In terms of overall strength I would assume it's the same since the block castings are almost identical, but an ultrasonic depth tester will tell you how thick the cast iron is.

 

Thank you for response. I am wondering because I have one of those blocks and planning on using it on high boost evo. I hope casting is same thickness as evo.