quick info needed.., from expirienced 7a engin builders.....plz Options

[mandrek]

hello all, i just have a quick question.. I'm in the process of gathering parts for a boosted 7a.. i have located a set of OEM, from the factory, Toyota 4agze pistons, and for a great price since the guy is just looking to get rid of them (change of plans..#.. thing is that they are .050" oversized..

now my question is.. is this a option that was made available to give Toyota service techs a slug that would provide tighter clearance on an old motor? #as i am suspecting# or is this an OEM replacement for use in a motor that has had to have the cylinder walls worked on #say to remove scoring) and thus the reason for the increased bore diameter..

the motor I'm looking to put these in is a 96 7a, and had 218K on it.. the walls of the cylinders are smooth as glass, and there are next to no markings showing wear. ill post a pic if need be.. but i don't think that it would be needed to answer my question..

i guess that what i am really getting at, is this... if i get these pistons will i need to have the block bored to accept these, or is this kind of o/s a tolerance check measure?

thank you..

This post has been edited by mandrek: Oct 22, 2011 - 11:24 AM

[mandrek]

And yes pauter sells a set for a bit too much than what i would want to spend on a single component of this engine. no doubt that the pauter rods are solid, but they are WAY over-kill for the power goals attainable by most who are working with the 7afe.. there is another option though. Belfab racing makes a set for the 7afe for $425. they are of an H-beam design and come with some fasteners that i do not recognize, but i know that if you call them prior to the order(or to make the order) that they can use specified ARP hardware, or at least give you the specs so you can some your self (what i plan to do).

Smaay, personally i agree with you on the boring of any block. personally i like the concept of maintenance machining, and nothing more (as far as the rotating assembly goes). but materials wise. this block can take a 1mm over, and run high boost, its all in the tune. and in regards to the general idea of this not being a "performance motor" i agree. but not to the extent of not using it as a platform.. the short block is regularly used as an upgrade for the hatchi, and has a good bit of potential under boost. but the head (as i am sure you know) was designed as a fuel conservation head (at the time), so what we get is this torque happy (relative) motor and a head that does not like to breath up top.. lol but this does not mean we cant just SHOVE more air down its throat though.. lol