Posted By: Stationwagonguy
How do you tell a 400 thick main webbing block apart? - 06/06/07 01:24 AM
Other than the blatantly thick webbing. I had though they had "230" as part of the casting number in them, but someone who I was going to buy a block from insists that they made them from 1972-1974, and if they have a circular water jacket as opposed to an oval one, they're automatically thick blocks. Is this true, or is this guy confused?
And what is a normal 400 block worth these days, anyways?
Posted By: moparmarks
Re: How do you tell a 400 thick main webbing block apart? - 06/06/07 01:33 AM
The 230 "cold weather block" was cast in the last 6 months of 71 for the 72 model so if it has a 71 cast date then should be good to go. I've got up to 450.00 for a nice early block.
Posted By: E85-408
Re: How do you tell a 400 thick main webbing block apart? - 06/06/07 04:12 AM
Check 440 Source for info. Click on everything you need to know about blocks.(great pics too)
Posted By: Anonymous
Re: How do you tell a 400 thick main webbing block apar - 06/06/07 06:53 AM
They're all good!
http://www.440source.com/blockinfo.htmShown above is the #2 saddle on a late model (76-78) 400 block, casting #4006530-400. The "B" measurement remains the same as the early 400 block at about .525 -.575, while the "A" goes down to roughly 3.300, making the support only less than half an inch narrower then the early 400 (still almost 90% of the width), and still over 1 1/4 inches wider then 383's and early 440's.
Posted By: RobX4406
Re: How do you tell a 400 thick main webbing block apar - 06/06/07 07:00 AM
440 source could really use some more info about the cold weather blocks as what they have there is lacking. Try this thread. has casting date periods and some other stuff:
https://board.moparts.org/ubbthreads/show...rue#Post3510159
Posted By: Stationwagonguy
Re: How do you tell a 400 thick main webbing block apar - 06/06/07 07:37 AM
Good info. Thanks!
But seriously- is $200 about the going rate for a normal 400 block, or is that too much?
Posted By: quickd100
Re: How do you tell a 400 thick main webbing block apar - 06/06/07 10:45 AM
Reguardless if you get the early thick web block or not. SONIC TEST THEM ALL! I've got a thick web block that's never been bored,(7-31-71) it looks beautiful. 4 cylinders are thin and need sleeves if it were to be used. One cylinder is .083 thick at standard bore. It's a nice looking doorstop. Dave
).
if the rumor is true about low deck megablocks coming down the pike cold weather blocks will be relegated to what the rest of the stock factory blocks are ... worth their weight in SCRAP without magnaflux AND sonic check ...