first I like to say hi, new to moparts. Looking for advise on what bearings to use for a 470,and which rods would you use long or short. Motor for 68 dart more street than strip.

Thank

Which block are you going to use, low deck 400 or a high deck 440? It really makes a difference on the both the rod length and main bearings I've built both with the 3.90 or 3.91 stroke cranks, they rock

The block is a 400,and I used a 440 crank for the 470.

Lope68

Welcome aboard! 400 block/440 crank/440 rods/KB 280 pistons (iirc). I'd offset grind the crank to get 470 cubes. Not sure if you need/want 360 oiling main bearings but that would be my personal choice (rods are the end of the (oiling) line & the cause of alot of oil starvation mishaps. You did say street but you know how that goes! I'd consider some stealth heads/get quench/desired SCR/appropriate cam for a spot on long block then work on ign/fuel/exh etc. Post how it goes

A 470 is 4.375" 400 block with offset ground 440 crank, new stroke is 3.91, and rod journal is 2.200", bigblock chevy size.

A 6.535 chevy rod will give bore/stroke of 1.67 which is good for street but you could go even shorter on the rod to 6.385, which is bigblock chevy +0.250 length, giving R/S ratio of 1.63.

Zero deck with the 6.535" rod is 1.490 CH
Zero deck with the 6.385" rod is 1.640 CH

The 470 is quite close dimensionally to a 455 buick engine and those engines liked to rev, at least until they blew due to oiling issues. I loved my '70 GS455, it was a blast to drive. Your 470 will be even better because of stronger and lighter components.

Under no circumstances go longer than 6.535 on the rod length, not for a mostly street engine.

R.

The answer on which rods to use depends on several factors. First question is which rod journal does your crank have? If you have a BB Chevy rod journal then there are more options than if the crank has Mopar journals.

I'd probably use a 6.70 long BBC rod but it depends on the piston choice as well as other things. The 440Source 470 kit uses a 6.535 rod which is an okay choice also.

So what is your problem with this John?

It seems you skipped over the part where he said he was going to build a 470. Everything in your reply was aimed at a 451.

Just Checkin'
R.