bored out
08-14-2007, 02:39 PM
#2
2nd Gear Member
Join Date: Oct 2006
Posts: 383
RE: bored out
I'm not sure how far out you'd be able to bore, but with newer engines, you usually can't bore it over too much (i.e. it's not a 454 that you could bore to 600). not too many people have gone the NA route, so I'd consider boosting (it's cheaper and easier).
08-14-2007, 03:16 PM
#7
2nd Gear Member
Join Date: Oct 2006
Posts: 383
RE: bored out
the problem with boosting AND boring is that you can crack the block (as boring the cylinders reduces the strength of the block). I wouldn't recommend boring the block out, and if one wanted more displacement, it might be a better idea to buy a built block from a reputable company
08-15-2007, 11:08 AM
#8
3rd Gear Member
Join Date: Jul 2007
Location:
Posts: 536
RE: bored out
with stock parts, that is a no-no. if you have aftermarket, and they are strong enough, then i dont see why not. and yes, 4.2 is what you would be looking at
08-15-2007, 02:36 PM
#9
5th Gear Member
Join Date: Oct 2005
Location: Seattle, WA
Posts: 3,696
RE: bored out
ORIGINAL: Wickerbill
There are variables involved here, too much to say 4.2 is what you would have if you bored. The displacement would be different depending on what you bored. Ive not checked to see what oversized pistons are available, but im sure there are some available since the 4.0 has been around a while. .010" - .060" is usally the standards. If there is a .060" oversized piston out there dont be afraid to use it. No matter what ppl say these pistons are tried and tested and if it wouldnt work these aftermarket companies wouldnt sell something that wouldnt hold up thus making them libel for damage. If you are going F/I you can install flat top pistons therefore reducing compression ratio to compensate. The only thing I would be concerned about are the large coolant holes our blocks have thus limiting our bore size.
with stock parts, that is a no-no. if you have aftermarket, and they are strong enough, then i dont see why not. and yes, 4.2 is what you would be looking at
thats why i left my answer open ended. however, there are two people have have bored out their engine, and they both went to 4.2
08-15-2007, 02:41 PM
#10
3rd Gear Member
Join Date: Jul 2007
Location:
Posts: 536
RE: bored out
yeah im not saying it wont be 4.2, but all that depends on a number of things including bore and stroke. The stroker 3.8L are 4.2L from what i have read, I dont know but I think they achieve this with stroke only and no bore