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andy669 · 04-18-2005, 07:13 PM

The most common 347 is a 3.4 crank with a 4.030 bore. The most common 331 is a 3.25 crank with a 4.030 bore. Most companies use a 5.400 rod, but I have seen some use a 5.315. On a normal street motor, it will make no difference.

If you want a 331, I have a 3.25 4340 forged crank for sale. Its in excellent condition.

Andy

04-18-2005, 07:13 PM	#11
andy669 Registered Member Join Date: Jan 2001 Location: Moline Il Posts: 901	Re: Stroker Block Questions The most common 347 is a 3.4 crank with a 4.030 bore. The most common 331 is a 3.25 crank with a 4.030 bore. Most companies use a 5.400 rod, but I have seen some use a 5.315. On a normal street motor, it will make no difference. If you want a 331, I have a 3.25 4340 forged crank for sale. Its in excellent condition. Andy __________________ 88 coupe 91 LX NMRA Pure Street 5120