shawnss Posted January 31, 2011 Report Share Posted January 31, 2011 (edited) Ok im kinda stuck. 3 years ago i lost #7 piston it cracked cause of a bad tune or so we thing. well i pulled the Stock LQ9 and i took it to my builder. at that point i was on a very tight budget. i told him to just put new set of stock pistons in it and refreshen everything else up. Well he went a head and bored the block .020 over and put it all back together. well after about 3k miles i bent a rod. So im to the point where im going with forged internals. but my stock LQ9 is already bored over .020 so is it worth it to bore it another .010 to get a 370. Or should i just have custom pistons made for a .020 bore. the cylinders look great cause it only had 3k miles on it. this is going to be boosted. heres a pic of the cylinders and all of them look this way. Edited January 31, 2011 by shawnss (see edit history) Quote Link to comment Share on other sites More sharing options...
04CHASE Posted January 31, 2011 Report Share Posted January 31, 2011 (edited) if you can clean it up @ 4.03 that will save you the most as off the shelf pistons are available and are cheaper than custom . btw how did he use stock size pistons on a 4.02 bore? Edited January 31, 2011 by 04CHASE (see edit history) Quote Link to comment Share on other sites More sharing options...
shawnss Posted January 31, 2011 Author Report Share Posted January 31, 2011 Sorry the topics should have been. Building a motor Should I worry about boring it anymore.I guess that's what happens when you rush things. Quote Link to comment Share on other sites More sharing options...
04CHASE Posted January 31, 2011 Report Share Posted January 31, 2011 (edited) no , as long as it cleans up the cylinder enough . that should be up to your builder not us. the question to be asked is a 3.622 crank or a 4.00 crank Edited January 31, 2011 by 04CHASE (see edit history) Quote Link to comment Share on other sites More sharing options...
shawnss Posted January 31, 2011 Author Report Share Posted January 31, 2011 if you can clean it up @ 4.03 that will save you the most as off the shelf pistons are available and are cheaper than custom . btw how did he use stock size pistons on a 4.02 bore? To tell you the truth I was wondering the same thing myself. That's what my builder told me. It was the first LS motor he has ever worked on. Funny thing is the first go around he ended up putting one 4.8 rod in it. Well I put the heads on and tried turning the motor over. Well that didn't work so well. The rod was way to long and was hitting the head. I ended up having the pull the motor back out of the truck. I lifted the heads off and found out that #7 rod was a 4.8 rod. What a bad mistake on his part. Needless to say ill never use him again. But I know the cylinder is bored .020 over. We measured it after the last tear down. Quote Link to comment Share on other sites More sharing options...
smoothdime Posted February 2, 2011 Report Share Posted February 2, 2011 so what builder are you going to use this go around? i'd be interested in knowing a good builder once i get up that way. Quote Link to comment Share on other sites More sharing options...
zippy Posted February 2, 2011 Report Share Posted February 2, 2011 I would certainly just go to a 4.030 bore just because now you also have to trust his machine work. I also agree with Chase, the bigger question is whether or not to just stroke it while you're there. It sounds like you will need to buy rods and pistons anyway which will just leave a crank keeping you from a much better 408. A 408 would be much stronger when not in boost and be considerably quicker in spooling the turbo. Quote Link to comment Share on other sites More sharing options...
TheGeorgiaKid Posted February 4, 2011 Report Share Posted February 4, 2011 What is the maximum you can bore a stock LQ9 6.0 block?? Just curious if it can be bored to 4.125" & use a 4" stroke crank to make a 427? Would the cylinder walls be to thin if it was bored that much? Quote Link to comment Share on other sites More sharing options...
04CHASE Posted February 4, 2011 Report Share Posted February 4, 2011 thats way to much . i woundt go past 4.060 on a 6.0 block for n/a and 4.040 boosted. the 6.2 blocks can be taken that big not the 6.0s Quote Link to comment Share on other sites More sharing options...
TheGeorgiaKid Posted February 4, 2011 Report Share Posted February 4, 2011 thats way to much . i woundt go past 4.060 on a 6.0 block for n/a and 4.040 boosted. the 6.2 blocks can be taken that big not the 6.0s Thanks Chase. I didn't know & wanted to... now I do. So putting a 4" stroke crank in a stock 4" bore 6.0 block will make it a 408? Quote Link to comment Share on other sites More sharing options...
04CHASE Posted February 4, 2011 Report Share Posted February 4, 2011 3.622 =stock stroke 3.622x4.00 = 364 3.622x4.03 = 370 4.00x4.00=402 4.00x4.03=408 Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.