Ryan218 Posted June 28, 2013 Report Share Posted June 28, 2013 alright so im going to build a 4v motor to put in my 2000 gt. im going to start off with a 97 or 98 mark 8 motor. I plan on using a set of 03/04 cobra heads I have got and ive decied I want to do... even it it cost me more in the end is a ported 03/04 eaton setup. for the bottem end here is my hanging up point. a cobra roating assembly is always a possibility and after browsing ebay looks like I can pick up one for around 700 minus crank. after doing some digging ive found that the new 5.0 coyote rods will work and they are 40 grams lighter per rod. that's shaving almost 3/4 a pound of the roating mass and are just as strong ( per what internet says. and I can pick up a new set for 300 bucks. for pistons what is my best bet. is there a factory ford forged pistion out there other then the 03/04 cobra's ( ive checked through work can no longer get them or I would just go this route. ) im sure everyone is just going to say buy a 03/04 motor and I would but id rather build one. never built a 4v from the ground up plus this block will be stronger. I want 500-550 at the wheels is my goal as this will make it a more them what I need for what I really plan on using the car for but more fun at the same time. not in a huge hurry to have the motor built as car is getting put away in 2 months to be stripped and re painted then ill put the new motor in. so cliff notes- what pistions and crank do I use? would like this to be a 100% ford motor build without ordering aftermarket parts unless there needed. Quote Link to comment Share on other sites More sharing options...
99BlownYellowGT Posted June 28, 2013 Report Share Posted June 28, 2013 In my 2v I used diamond pistons and 03 cobra crank Quote Link to comment Share on other sites More sharing options...
kirks5oh Posted June 28, 2013 Report Share Posted June 28, 2013 modularfords.com is your friend. very informative forum for tech related questions. that's all i got good luck. keep us updated with the build Quote Link to comment Share on other sites More sharing options...
Not Brian Posted June 28, 2013 Report Share Posted June 28, 2013 LS1 Quote Link to comment Share on other sites More sharing options...
DKilbourne Posted June 28, 2013 Report Share Posted June 28, 2013 03/04 Cobra crank and rods. Get some .20 over pistons as the stock 03/04 cobra pistons have very tight piston to wall clearances. Like Kirk said, go to modfords and ask there. Some very good info over there. Quote Link to comment Share on other sites More sharing options...
Ryan218 Posted June 28, 2013 Author Report Share Posted June 28, 2013 id like to be able to just do this all in my garage vs taking block to a machine shop and them having it for weeks before its ready. like to stay standard pistions. Quote Link to comment Share on other sites More sharing options...
Aaron Posted June 28, 2013 Report Share Posted June 28, 2013 So you are going to spend all this money on a rebuild, but you aren't going to get the walls at least finish honed? Quote Link to comment Share on other sites More sharing options...
Ryan218 Posted June 28, 2013 Author Report Share Posted June 28, 2013 So you are going to spend all this money on a rebuild, but you aren't going to get the walls at least finish honed? your right. probably wouldn't be a bad idea to have a machine shop tank the block and just do it right the first time. save money in the end. ok new plan. im going to use coyote rods, a 03/04 crank if I can find one and for pistons I just need something similar to the 03/04 cobra as I don't plan to use anything other then stock cams. Quote Link to comment Share on other sites More sharing options...
kirks5oh Posted June 28, 2013 Report Share Posted June 28, 2013 your right. probably wouldn't be a bad idea to have a machine shop tank the block and just do it right the first time. save money in the end. ok new plan. im going to use coyote rods, a 03/04 crank if I can find one and for pistons I just need something similar to the 03/04 cobra as I don't plan to use anything other then stock cams. Sounds like a recipe for building your first motor and having some one fix it when it spins a bearing. I'll be the first to admit I've never built a bottom end, but I would think a machine shop should be an integral component of a successful first engine build. As stated, you want the cobra crank and rods. Get a good set of 20-over pistons and get the block machined. Quote Link to comment Share on other sites More sharing options...
Ryan218 Posted June 28, 2013 Author Report Share Posted June 28, 2013 Sounds like a recipe for building your first motor and having some one fix it when it spins a bearing. I'll be the first to admit I've never built a bottom end, but I would think a machine shop should be an integral component of a successful first engine build. As stated, you want the cobra crank and rods. Get a good set of 20-over pistons and get the block machined. is there a company I can call to cross reference the cobra piston part number and get a similar piston this way? also why do the 03/04 cobras show a grade 2 and grade 3 on there pistions. what the difference? ive built a few push rod motors just never a 4v mod motor. ill have a buddy help me with the heads and assembly of that and timing chains as it looks massively intimidating to me lol. Quote Link to comment Share on other sites More sharing options...
y2k2gt Posted June 29, 2013 Report Share Posted June 29, 2013 http://www.columbusracing.com/forums/showthread.php?t=112549 Quote Link to comment Share on other sites More sharing options...
Ryan218 Posted June 30, 2013 Author Report Share Posted June 30, 2013 http://www.columbusracing.com/forums/showthread.php?t=112549 Cast crank though. This what was in your gt before? Quote Link to comment Share on other sites More sharing options...
y2k2gt Posted July 1, 2013 Report Share Posted July 1, 2013 N0 it was not in my car. One could take it apart and put a cobra crank in it. The cast crank will support 600rwhp. Quote Link to comment Share on other sites More sharing options...
On3Performance Posted July 2, 2013 Report Share Posted July 2, 2013 Ive had a teksid block just laying here for awhile if you build something from scratch. It needs a new home bad Quote Link to comment Share on other sites More sharing options...
KillJoy Posted July 2, 2013 Report Share Posted July 2, 2013 N0 it was not in my car. One could take it apart and put a cobra crank in it. The cast crank will support 600rwhp. My Marauder had a cast crank. It hit 500 rwhp on DynoTune's Dyno. Never had an issue. KillJoy Quote Link to comment Share on other sites More sharing options...
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