I'm corn-fuzed again. I am matching a b18a1 block with a B18c1 head. I am using GSR 5.429 in. Eagle rods and the b18a1 crank. I want to keep the cylinders the same OEM diameter. I am concerned that the B18a1 rods were 5.394" and the Eagle rods are 5.429" = .035" longer. I will be using a standard 3 layer LS head gasket. I thought I had to get higher compression pistons to counter the short LS rod. But now with the longer Eagle rod what forged piston should I seek? Compression 11.5 is the most I want to use.
PS, the cylinder chambers will have all hard lines removed and valve seats unshrouded. Thanks. RFT

 

You'll need to use ls rods, then get the piston compresson you desire.

 

I yain't goin back. These Eagle rods are too strong and good lookin to consider going back to the LS rods. Haha. No-way. I'm going forward and I yain't goin' back!!!! Thanks for the suggestion.

 

Nah, sell them and buy some forged ls rods. Good luck.

 

they wont fit
ur better off keeping ur stock ls rods and shave .7mm on the small end
use some honda 81mm pistons like ITR or P30, p30 dont require the rods to be shaved

 

OK, thanks guys. I give. 'Deese purdy GSR Eagle rods will not work with my LS crank. The joke is on me. Har-dee Har-harrr. RATS!!!!!! I put the rods on the crank for a test and the width is way to small. Now I go research and find the LS rods BEW is .935 and the GSR BEW is .858.
Soo, I $&&**^$#@$*^$( the pooch. I'll be back.....

 

Since you've already got the rods I'd pick up a b18c crank and call it a day.

 

I am aiming at acheiving 11.2 - 11.5 compression. A GSR crank and rod combo installed in the LS B18a1 block are not going to throw high enough, are they? I beleive the LS has a stroke 3.504" and GSR crank strokes 3.433". That's .071" = 1.8mm?? How does a builder overcome that shortage?
Thanks, RFT.

 

The difference in stroke is the reason for the difference in rod lengths.


The VTEC and nonVTEC B18s have the same deck height, and thus their rotating assemblies are interchangeable.

 

Let me see if I have this correct. The (stroke length + Rod length) - (Bottom End width/2) = total assembly [pin radii are equal]

GSR: stroke 3.433 + rod 5.429 = 8.862
bottom end width .858 /2 = .429
/// 8.862 - .429 = 8.434

LS: stroke 3.504 + rod 3.504 = 8.898
bottom end width .935/2 = .467
/// 8.898 -.467 = 8.431

So it looks like the assemblies "traveling" length even out according to this fabricated bull$^&^ formula I just concocted. Hahaha!!! So now I have to find either a GSR crank or LS Eagle rods whichever comes easiest. Thanks RFT.