as far as I know they are all the same. the best thing to do as far as oem are LS rods. they're stronger than any D rod. but I would guess that the z6,y8,d15b have the strongest rods.
Yes, LS rods must be modified. 92+ D16 rods are about the best that you will get for stock rods. Notice that the d16a1 rods are "beefier". However they are also reported to be more brittle, so no stronger than later d16 rods.
General concensus is 210-220whp is the limit for stock rods. So if you are planning for considerably > 200whp, then plan on new rods.
Hey there are my pics !! I have read somewheres as well that the PG6 rods (d16a1) are more brittle as well, but FJT's buddy is running 16psi or so on them make 250 whp and 260ish wtq. I bought a set and was going to run them but changed my mind and ended up buying scat rods.
- Horizontally opposed four cylinder VW air cooled design Dyno results on one of our own turbocharged methanol (no nitro, no nitrous) version at 35 lbs boost produced over 980 hp and 780 ft/lbs torque at 7400 rpm and 6800 rpm, respectively.
Not so bad too They have the world record too of NHRA drag racing 4 cylinders @ 6.71 seconds at 198mph ( VW )
stock rods should handle any NA setup. not too many NA are over 200 WHP
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