I have a stock USDM B18c1 and wanted to do an ls/vtec to get more comp and displacement. I was just wondering why LS rods and crank can't be put in a GSR block? Are the blocks that different? Are the mains different sizes or spacings? I tried to search for this first, but the search button kept sending me to a blank screen. If anyone could give me some answers that would be great. Thanks.

 

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The blocks are the same.

The cranks and rods need to match however. LS crank gets LS rods, GSR/Type R crank gets GSR/Type R rods.

Use whatever pistons you like.

LS rods are wider than GSR/Type R rods, thus the reason they don't interchange, not to mention the pin height will be really low or really high.

 

The blocks are actually a little different with regards to deck height. I think it throws mechanical timing off almost a degree.

 

I have heard this as well and some of the online calcs show it too. I haven't seen any solid proof though. When I get my GSR block machined, I'll take the LS block down as well and ask them to measure the deck heights.

 

I believe it is in the factory service literature.

 

U need to plug the oil squirter's or notch the pistons as they hit.

 

LS 211.84
GSR/B16B 212.39



seems like that is backwards being as the LS has the longer stroke, but 3 diff sources say the same thing.



how exactly does that affect putting an LS crank and rods in a GSR block, lower compression even if using GSR pistons??

 

Just molest the deck height calc so the pistons are deeper in the hole by .55

 

edit:

with the GSR's mormal .76mm piston to deck hieght you come with 1.31 mm with the diff in deck height. i dont think that would fare well on stock sleeves at higher power because you have way more combustion chamber that is in the sleeve. maybe i am wrong but that just doesnt seem safe to me VW VR6's have the comb chamber in the bore but it is a solid deck motor