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400 blocks is there a big difference #1567710 01/23/14 07:34 PM 01/23/14 07:34 PM
Joined: Aug 2004 Posts: 3,392 cheshire, ct D davesmopars OP master
davesmopars OP master D Joined: Aug 2004 Posts: 3,392 cheshire, ct	400 blocks is there a big difference 1970 to 10 of 71 castings, are these the best??? thanks for any help. Keeper of the 440 M code Cuda registry mcodecuda@yahoo.com

Re: 400 blocks is there a big difference [Re: davesmopars] #1567711 01/23/14 09:13 PM 01/23/14 09:13 PM
Joined: Nov 2003 Posts: 1,838 NW Indiana F fbs63 top fuel
fbs63 top fuel F Joined: Nov 2003 Posts: 1,838 NW Indiana	The last 3 numbers of the casting number will be 230. And there are 230 casting blocks without the thick main webs. You have to look. But you still need to sonic check. Older blocks seem to have more core shift. I would not worry much about year and go with the one that sonic checks the thickest.

Re: 400 blocks is there a big difference [Re: davesmopars] #1567712 01/24/14 02:13 PM 01/24/14 02:13 PM
Joined: Jul 2004 Posts: 19,317 State of confusion T Thumperdart I Live Here
Thumperdart I Live Here T Joined: Jul 2004 Posts: 19,317 State of confusion	FWIW my 400 block came out of a 72 truck and the sonic #`s were decent and has been goin strong for 13+ years............. 72 Dart 470 n/a BB stroker street car `THUMPER`...Check me out on FB Dominic Thumper for videos and lots of carb pics......760-900-3895.....

Re: 400 blocks is there a big difference [Re: davesmopars] #1567713 01/24/14 04:22 PM 01/24/14 04:22 PM
Joined: Apr 2013 Posts: 345 Nebraska 4 451Cuda enthusiast
451Cuda enthusiast 4 Joined: Apr 2013 Posts: 345 Nebraska	I sought out a 230 casting in that date range that most recommend - pre 10/71, and it sonic checked about the same as two later ones I've recently bought pretty cheap. From looking at the webbing of both types, I feel any 400 block will probably have similar life expectancy in a street/strip stroker like I'm planning. If I was to step up the power a significant amount I'd definitely go with an aftermarket low deck block.

Re: 400 blocks is there a big difference [Re: 451Cuda] #1567714 01/24/14 05:00 PM 01/24/14 05:00 PM
Joined: Jan 2004 Posts: 13,247 Mt. Vernon, Ohio dartman366 I Live Here
dartman366 I Live Here Joined: Jan 2004 Posts: 13,247 Mt. Vernon, Ohio	From the research that I have done any 400 block would be a better choice for rigidity than any 440 block out there from a stock factory block standpoint, as long as they sonic good.jmo Light travels faster than the speed of sound,,,this is why some people seem bright untill you hear them speak.

Re: 400 blocks is there a big difference [Re: dartman366] #1567715 01/25/14 02:03 PM 01/25/14 02:03 PM
Joined: Nov 2003 Posts: 36,040 Lincoln Nebraska R RapidRobert Circle Track
RapidRobert Circle Track R Joined: Nov 2003 Posts: 36,040 Lincoln Nebraska	Quote: From the research that I have done any 400 block would be a better choice for rigidity than any 440 block out there from a stock factory block standpoint, as long as they sonic good.jmo X2. If a stroked "B" will get you the cubes you want then it's a better choice (my limit is 470 which is using an offset ground 440 crank) including it being lighter & a MUCH better fit in an A body. If more cubes are needed then go with the RB block, my next one is going to be a 535 (30 over 440 block) . Not sure whether to get a kit (440 source maybe) or an Ohio crank/some eBay chebby rods/& the KB pistons for that live every 24 hour block of time like it's your last day on earth

Re: 400 blocks is there a big difference [Re: dartman366] #1567716 01/25/14 02:06 PM 01/25/14 02:06 PM
Joined: Jun 2008 Posts: 768 Maryville tn 67coronetman super stock
67coronetman super stock Joined: Jun 2008 Posts: 768 Maryville tn	Hmmmmm . ?? Quote: From the research that I have done any 400 block would be a better choice for rigidity than any 440 block out there from a stock factory block standpoint, as long as they sonic good.jmo Old car are me......

Re: 400 blocks is there a big difference [Re: 67coronetman] #1567717 01/25/14 02:59 PM 01/25/14 02:59 PM
Joined: Sep 2007 Posts: 14,889 up yours Supercuda About to go away
Supercuda About to go away Joined: Sep 2007 Posts: 14,889 up yours	Someone did a bunch of sonic checks on a number of 400 blocks spread out over the production run and the old "myth" of early blocks being better didn't seem to hold up. Ah here it is http://440source.com/blockinfo.htm Read and decide for yourself. They say there are no such thing as a stupid question. They say there is always the exception that proves the rule. Don't be the exception.

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