robertfrank

iTrader: (27)

Ok guys I have a redundant question I'd like to ask. I was wondering if using a 3500 bottom end in a 3.4 block is feasible. I can get both easily. Also, how difficult would it be to convert a rwd 3.4 to use a roller cam?

Six_Shooter

iTrader: (2)

What?

The 3500 bottom end includes the block, not sure how you're going to add the 3.4 block in there as well.

robertfrank

iTrader: (27)

Ok allow me to clarify. The 3500 rotating assembly in a 3.4 block.

Six_Shooter

iTrader: (2)

Yeah, that won't work out so well.

The cylinders don't have enough meat for to be safe, same reason it's not safe to bore out a 3.1 to 3.4 specs.

The block also needs to be clearanced for the 3500 rods due to the larger big ends, which may or may not be possible, leaning towards not or at least not worth the effort...

The small change in displacement will not be worth the effort. If you really want to have a 3.5L, use the LX9 bottom end, the improvements in the block are half of what makes it better than the the 3.4.

The most improvement to a 3.4 will be in getting it to breath better, meaning replace the top end with something better, best top end to start with is the LX9 3500 top end.

robertfrank

iTrader: (27)

I see, the biggest reason I asked was ofcourse the use of a 3500 top end with 3.4 pistons makes for a bit high in the compression department, so I wasn't sure if using 3500 pistons would help. Any word on how to convert to a roller cam?

Six_Shooter

iTrader: (2)

Yeah, don't... well you can, but it's not recommended on a 60* block that wasn't originally roller. To do a roller cam properly you limit the amount of oil to the lifters, since they need less oil than a flat tappet cam. On a non roller block there are only two lifter oil galleys and one of these two oil galleys feeds the crank as well. So if you limit oil flow to the lifters you also limit oil flow to the crank and cam, not good to do. Just another reason to use the LX9 block.

People have slapped roller cams in non roller blocks, without the oil restriction, but it wouldn't be how I would do it.


You can use LA1 (3400) pistons in the 3.4 and net approximately 9.6:1 SCR if you REALLY want to stick with a 3.4 bottom end.

robertfrank

iTrader: (27)

Ah ok, I see what you're saying now.