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Original Message
I've got a great looking "A" block.
By Dave Shoe - 10/01/2001 6:59:14 PM; IP 12.2.11.131
I took the "never disassembled" 428plain motor out of my Q-code 1967 LTD. It had the original valve cover gaskets and exhaust manifold "heat deflector" gaskets, so I know it was all original.

I sonic mapped the 428plain "A" block and the core shift looked excellent. I mathematically averaged the cylinder jacket diameter of all eight cylinders, comparing it to an FT block I had sonic mapped at the same time, and the "A" block had cylinder "water jacket" diameter numbers which were about .030" less than the 361/391FT block.

Based on this info, I'd be happy to take the 428 "A" block out +.030" and run it hard, but I'd be happy to take the 361/391FT block out to 428+.060" and run it just as hard (Note also the FT has reinforced cranksaddles, but the 428plain "A" block has standard cranksaddles).

Basically, the stock-bore 428 "A" block has cylinder walls which are exactly as thick as my plain 360/390 blocks. This means the 428 "A" cylinder jacket has a diameter about .080" larger than the 360/390 plain block. Basically, the 428 "A" block is exactly as sturdy as a 390plain block, but has enlarged cylinders - go figure.

I've never sonic mapped a 428CJ "C" block, but I suspect it uses 361/391FT cylinder jacket dimensions. I suspect these dimensions are .030" larger than the 428plain "A" block jackets.

As for 428SCJ engines getting "A" blocks, I sorta doubt it. Earlier 428PI and early 428CJ engines were rumored to have gotten the "A" blocks when supplies of the "C" block were low for some reason in 1968, but I've seen little indication this carried over into the 1969 model year, in particular to the 428SCJ block, which was designed to stress every component it had. I believe all 1969 428 blocks got the "C" block. Casting of the "A" block would have been fully phased out in 1968-1/2 when the midyear Galaxie XL dropped the 428plain engine as an option. Logically, only 428 "C" blocks would have been commissioned by the foundry from late-1968-on.

Shoe.
This thread, so far...
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Collapse <a href=../ForumFE/reply.aspx?ID=8364&Reply=8364><img src=../images/reply.png width=30 height=10></a>&nbsp;<a href="#" id="anchor8364" onclick="return false;">360 to 428cj? possible?</a>&nbsp;-- <font color=#0000ff>MustangRacer'67, <i>09/29/2001</i></font><script type="text/javascript"> new HelpBalloon({ dataURL: 'replyb.aspx?ID=8364', contentMargin: 60, icon: $('anchor8364') }); </script>  360 to 428cj? possible? -- MustangRacer'67, 09/29/2001
Collapse <a href=../ForumFE/reply.aspx?ID=8365&Reply=8364><img src=../images/reply.png width=30 height=10></a>&nbsp;<a href="#" id="anchor8365" onclick="return false;">RE: 360 to 428cj? possible?</a>&nbsp;-- <font color=#0000ff>richard, <i>09/29/2001</i></font><script type="text/javascript"> new HelpBalloon({ dataURL: 'replyb.aspx?ID=8365', contentMargin: 60, icon: $('anchor8365') }); </script>  RE: 360 to 428cj? possible? -- richard, 09/29/2001
Collapse <a href=../ForumFE/reply.aspx?ID=8367&Reply=8364><img src=../images/reply.png width=30 height=10></a>&nbsp;<a href="#" id="anchor8367" onclick="return false;">RE: 360 to 428cj? possible?</a>&nbsp;-- <font color=#0000ff>MustangRacer'67, <i>09/29/2001</i></font><script type="text/javascript"> new HelpBalloon({ dataURL: 'replyb.aspx?ID=8367', contentMargin: 60, icon: $('anchor8367') }); </script>  RE: 360 to 428cj? possible? -- MustangRacer'67, 09/29/2001
 go for it and have a blast!!(nm) -- richard, 09/29/2001
 with a 360 block how would it be a "true" 428CJ? -- FE427TP, 09/30/2001
Collapse <a href=../ForumFE/reply.aspx?ID=8370&Reply=8364><img src=../images/reply.png width=30 height=10></a>&nbsp;<a href="#" id="anchor8370" onclick="return false;">On rare occasion it can be done properly.</a>&nbsp;-- <font color=#0000ff>Dave Shoe, <i>09/30/2001</i></font><script type="text/javascript"> new HelpBalloon({ dataURL: 'replyb.aspx?ID=8370', contentMargin: 60, icon: $('anchor8370') }); </script>  On rare occasion it can be done properly. -- Dave Shoe, 09/30/2001
 Re: c4tz-12367-a -- Mike McQuesten, 09/30/2001
 RE: On rare occasion it can be done properly. -- MustangRacer'67, 09/30/2001
Collapse <a href=../ForumFE/reply.aspx?ID=8381&Reply=8364><img src=../images/reply.png width=30 height=10></a>&nbsp;<a href="#" id="anchor8381" onclick="return false;">What do you recommend sir? 390? 410?</a>&nbsp;-- <font color=#0000ff>MustangRacer'67, <i>10/01/2001</i></font><script type="text/javascript"> new HelpBalloon({ dataURL: 'replyb.aspx?ID=8381', contentMargin: 60, icon: $('anchor8381') }); </script>  What do you recommend sir? 390? 410? -- MustangRacer'67, 10/01/2001
 Study cylinder wall requirements for race engines. -- Dave Shoe, 10/01/2001
Collapse <a href=../ForumFE/reply.aspx?ID=8390&Reply=8364><img src=../images/reply.png width=30 height=10></a>&nbsp;<a href="#" id="anchor8390" onclick="return false;">RE: On rare occasion it can be done properly.</a>&nbsp;-- <font color=#0000ff>Scott Hollenbeck, <i>10/01/2001</i></font><script type="text/javascript"> new HelpBalloon({ dataURL: 'replyb.aspx?ID=8390', contentMargin: 60, icon: $('anchor8390') }); </script>  RE: On rare occasion it can be done properly. -- Scott Hollenbeck, 10/01/2001
I've got a great looking "A" block. -- Dave Shoe, 10/01/2001
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