400 sonic test
#2965778
09/20/21 02:49 PM
09/20/21 02:49 PM
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Joined: Jan 2003
Posts: 1,612 westerly, ri. usa
440lebaron
OP
top fuel
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OP
top fuel
Joined: Jan 2003
Posts: 1,612
westerly, ri. usa
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hi whats the best b eng 400 block to use? what are good sonic test numbers and where do you test? i was told once on thrust side??
all parts are sold as is, all parts are considered used no warranties or returns paypal/check/money order, shipping is from zip 02891, buyer pays paypal fees 24% IRS 1099A plus 3% of part price, check/money order preferred site is not monitored 24/7 there might be a delay in response
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Re: 400 sonic test
[Re: 80fbody]
#2965813
09/20/21 05:01 PM
09/20/21 05:01 PM
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Joined: Jan 2003
Posts: 31,076 Oregon
AndyF
I Win
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I Win
Joined: Jan 2003
Posts: 31,076
Oregon
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the early '72/''73 "cold weather" blocks were supposedly the best of the 400's. Part number ends in 230 I believe. Had some thicker side ribs. Whether it's really stronger, who knows. The early 230 blocks look really nice and have big beefy mains but the cylinder wall are not any thicker than other casting numbers. I spent a bunch of time finding an early 230 block years ago because I had heard that it was "the one". When we sonic checked that 230 block we found out it was junk. All of my money and my dreams of a killer block disappeared in a poof.
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Re: 400 sonic test
[Re: AndyF]
#2965876
09/20/21 09:41 PM
09/20/21 09:41 PM
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Joined: Aug 2003
Posts: 43,303 Bend,OR USA
Cab_Burge
I Win
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I Win
Joined: Aug 2003
Posts: 43,303
Bend,OR USA
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the early '72/''73 "cold weather" blocks were supposedly the best of the 400's. Part number ends in 230 I believe. Had some thicker side ribs. Whether it's really stronger, who knows. The early 230 blocks look really nice and have big beefy mains but the cylinder wall are not any thicker than other casting numbers. I spent a bunch of time finding an early 230 block years ago because I had heard that it was "the one". When we sonic checked that 230 block we found out it was junk. All of my money and my dreams of a killer block disappeared in a poof. I bought one of AndyF 230 cold weather block and sonic tested it, it was no better in the cylinder walls than any other 400 block I have tested OP, I shoot for a minimum of .160 after boring on the major and minor cylinder wall thrust surfaces, the block side and the cam side That has work so far up to 800 HP on race gas and a little more on E85, I do replace the main caps also do to a friend breaking one in a 451 C.I. 400 block S/G motor years ago making close to 750 HP and using old race gas in his Super Gas car I have bought three race blocks, high nickel Koleno, KB aluminum and the last one is a Bulldog cast grey iron. These will be used for a Hi Po build, north of 900 HP N/A I have cracked the main webbing in three RB blocks before switching too the 400 blocks to make sure I don't run over a crankshaft
Last edited by Cab_Burge; 09/20/21 09:51 PM.
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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Re: 400 sonic test
[Re: Diplomat360]
#2965951
09/21/21 10:29 AM
09/21/21 10:29 AM
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Joined: Jan 2003
Posts: 1,612 westerly, ri. usa
440lebaron
OP
top fuel
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OP
top fuel
Joined: Jan 2003
Posts: 1,612
westerly, ri. usa
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thanks for the info, going to run stock eliminator next year, need 400-500 hp 8 to 1 compression, found 3 blocks will check numbers
all parts are sold as is, all parts are considered used no warranties or returns paypal/check/money order, shipping is from zip 02891, buyer pays paypal fees 24% IRS 1099A plus 3% of part price, check/money order preferred site is not monitored 24/7 there might be a delay in response
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