Hey, getting ready to prep my beggining to rebuild my bottom end of my 4.6, big time questions i have, hopefully you guys can help. i am basically getting an 03 cobra crank and rods for a good deal. So i decided on Manley 18cc dished pistons standard bore 3.552. Now im stuck on bearings, guy at mod maxx told me to get romeo 4.6 main bearing. Will those main bearing fit the crank shaft? Also the ( OEM? Size) < whats that what size do i need? i just want to be able to buy everything and have no machine work.. ( plug and play) kinda deal!
reuild bottom end
03gtdude
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Hey, getting ready to prep my beggining to rebuild my bottom end of my 4.6, big time questions i have, hopefully you guys can help. i am basically getting an 03 cobra crank and rods for a good deal. So i decided on Manley 18cc dished pistons standard bore 3.552. Now im stuck on bearings, guy at mod maxx told me to get romeo 4.6 main bearing. Will those main bearing fit the crank shaft? Also the ( OEM? Size) < whats that what size do i need? i just want to be able to buy everything and have no machine work.. ( plug and play) kinda deal!
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233 Posts
Cobra and GT bearing size is the same. If your getting the Cobra crank used you need to have the journals mic'd up to verify its std. size or if its been ground. The exact in inches you need I would have to look up but you need to have the journals mic'd up. Mic to see if they are std. size if so then just do a quick micro polish.
I think you would be making a mistake to install the rods and crank from one block into another block without first doing some machine work.
Even though the parts are metal they still shift, distort and change in shape with use over the years and miles of service.
Even the slightest change of shape and fit of the parts can cause you to destroy your new engine.
You should always keep the block, crank and rods together as a unit if you are not going to do basic machine work to make sure that all the parts are true.
If you are gonna mix and match blocks, cranks, and rods then you should at least hone or bore the block WITH a deck plate, re-size the rods and turn the rod and main journals of the crank, taking off just enough to make sure the crank journals are true and round.
You should also check the main saddles of the block to make sure that they are still true.
I don't mean to be rude or anything but to be honest if you are mixing and matching parts from multiple blocks and you are not aware of the things you need to do in regards to machine work to make them work together, then you should probably leave all the parts with a good machine shop, allow them to do the needed machine work AND let them build the short block so they can be sure that all the parts are true and within specs and tolerances.
Even though the parts are metal they still shift, distort and change in shape with use over the years and miles of service.
Even the slightest change of shape and fit of the parts can cause you to destroy your new engine.
You should always keep the block, crank and rods together as a unit if you are not going to do basic machine work to make sure that all the parts are true.
If you are gonna mix and match blocks, cranks, and rods then you should at least hone or bore the block WITH a deck plate, re-size the rods and turn the rod and main journals of the crank, taking off just enough to make sure the crank journals are true and round.
You should also check the main saddles of the block to make sure that they are still true.
I don't mean to be rude or anything but to be honest if you are mixing and matching parts from multiple blocks and you are not aware of the things you need to do in regards to machine work to make them work together, then you should probably leave all the parts with a good machine shop, allow them to do the needed machine work AND let them build the short block so they can be sure that all the parts are true and within specs and tolerances.
o yea deff. getting machine worked but just doing the journels, should be good buddy of mine did his couple months back, worked good. THanks though trust me im a little etchy, but ive done my homework and it should ride out pretty nice.
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21,895 Posts
Just to confirm, you should be good with Romeo bearings since the 03 Cobra used a Romeo block.
And as always, check your clearances before you actually install everything.
And as always, check your clearances before you actually install everything.
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