dmf21209 Posted November 30, 2009 Report Share Posted November 30, 2009 So after getting into chevy and being on the forum for a bit and all that, been hearing alot about people stepping up to the 408. Is it a motor itself or do you just buy the rotating assembly to turn the Lq9 into a 408? like this: http://www.texas-speed.com/shop/item.asp?i...86&catid=88 Quote Link to comment Share on other sites More sharing options...
SSplaytoy Posted November 30, 2009 Report Share Posted November 30, 2009 So after getting into chevy and being on the forum for a bit and all that, been hearing alot about people stepping up to the 408. Is it a motor itself or do you just buy the rotating assembly to turn the Lq9 into a 408? like this: http://www.texas-speed.com/shop/item.asp?i...86&catid=88 That's one way to do it or you can machine the block .030 over Quote Link to comment Share on other sites More sharing options...
dmf21209 Posted November 30, 2009 Author Report Share Posted November 30, 2009 (edited) That's one way to do it or you can machine the block .030 over which route do most people go with? Edited November 30, 2009 by DMF (see edit history) Quote Link to comment Share on other sites More sharing options...
SSplaytoy Posted November 30, 2009 Report Share Posted November 30, 2009 which route do most people go with? I believe most people bore it out. Between the bore and rotating assembly choice, you get a 408. Quote Link to comment Share on other sites More sharing options...
12'SROCK Posted November 30, 2009 Report Share Posted November 30, 2009 stock bore LQ9 with the stroker assembly equals 402 cubic inches..... Boring the LQ9 to .030" over will achieve a 408 cubic inches.. Hope this helps. Quote Link to comment Share on other sites More sharing options...
dmf21209 Posted November 30, 2009 Author Report Share Posted November 30, 2009 stock bore LQ9 with the stroker assembly equals 402 cubic inches..... Boring the LQ9 to .030" over will achieve a 408 cubic inches.. Hope this helps. yep, pretty much what I was lookin for. have to change the heads if you did the bore/stroker kit? Quote Link to comment Share on other sites More sharing options...
zippy Posted November 30, 2009 Report Share Posted November 30, 2009 yep, pretty much what I was lookin for. have to change the heads if you did the bore/stroker kit? No, you can use your stock heads. Quote Link to comment Share on other sites More sharing options...
turboed ss Posted November 30, 2009 Report Share Posted November 30, 2009 No, you can use your stock heads. Agreed i have a 408 w/ stock heads.. Quote Link to comment Share on other sites More sharing options...
12'SROCK Posted November 30, 2009 Report Share Posted November 30, 2009 (edited) yep, pretty much what I was lookin for. have to change the heads if you did the bore/stroker kit? As stated above you can use your stock heads but remeber to check PTV clearance if using domed pistons or high lift cams. Good luck with your build Edited November 30, 2009 by WICKEDOWESIX (see edit history) Quote Link to comment Share on other sites More sharing options...
dmf21209 Posted December 11, 2009 Author Report Share Posted December 11, 2009 As stated above you can use your stock heads but remeber to check PTV clearance if using domed pistons or high lift cams. Good luck with your build Thanks, not building tho, just some gee whiz info, but gives me another direction to go with the truck Quote Link to comment Share on other sites More sharing options...
shadowsniper3006 Posted December 12, 2009 Report Share Posted December 12, 2009 anyone know the max over bore on the lq9? .060? Quote Link to comment Share on other sites More sharing options...
12'SROCK Posted December 12, 2009 Report Share Posted December 12, 2009 anyone know the max over bore on the lq9? .060? I would not run anything (high performance wise) .030" over an original bore size... Thats just me though Quote Link to comment Share on other sites More sharing options...
shadowsniper3006 Posted December 12, 2009 Report Share Posted December 12, 2009 what would be your reason? I'm not sure if the lq9 allows for a .060 over bore due to water but besides water jackets in the block, does the block distort from being thinner wall section between cyclinders. I have heard of guys running .060 over on SBC but that ment if something happened the block was junk due to not being able to bore any larger Quote Link to comment Share on other sites More sharing options...
12'SROCK Posted December 12, 2009 Report Share Posted December 12, 2009 what would be your reason? I'm not sure if the lq9 allows for a .060 over bore due to water but besides water jackets in the block, does the block distort from being thinner wall section between cyclinders. I have heard of guys running .060 over on SBC but that ment if something happened the block was junk due to not being able to bore any larger Yes you have thinner cylinder wall bores which are weaker and are prone to running hotter. Quote Link to comment Share on other sites More sharing options...
idahoBLKss Posted December 13, 2009 Report Share Posted December 13, 2009 stock bore LQ9 with the stroker assembly equals 402 cubic inches..... Boring the LQ9 to .030" over will achieve a 408 cubic inches.. Hope this helps. what stroker assembly do people go with the get the 402... could you put a link up please? 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.