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Original Message

Factory cam specs

By Derek66 - 03/30/2002 9:56:32 PM; IP 207.102.191.63

There was some discussion awhile back, about the actual cam specs for the 390GT/428CJ engines. I dug REAL deep into an old pile of info and papers, and found some notes I made from 83/03/07. Since Forum members were also interested in comparing aftermarket cams and copies of the CJ, I thought it might pay to post them.

This was a 64,000 mile used CJ cam (C6OZ-6250-B), in reasonably good condition.

[@ .050" lifter rise]
Int.Open @ 11-1/2° ATC - Int.Close @ 40-1/2° ABC
Exh.Open @ 48-1/2° BBC - Exh. Close @ 6-1/2° BTC

Duration @ .050" = 209°INT / 222° EXH

Lobe Lift : .265"/INT, .269"/EXH (.458"/.465" @ 1.73)

LSA = 115.5°

C/L = 116°/INT, 115°/EXH

We can compare this with Lunati's published specs for their 'Blueprinted' stock cam:

Gross Duration: 304°/INT, 324°/EXH

Duration @ .050": 224°/INT, 232°/EXH

Gross Lift: .481"/INT, .490"/EXH

LSA = 114°

Just for interest' sake, here's the specs from a Cam Dynamics 428CJ #CJN-2 NHRA Stock Eliminator 'Cheater' Cam:

[@ .050" lifter rise]
Int.Open @ 9° BTC - Int.Close @ 59° ABC
Exh.Open @ 67-1/2° BBC - Exh. Close @ 20-1/2° ATC

Duration @ .050" = 248°INT / 268° EXH

Lobe Lift : .275"/INT, .283"/EXH (.475"/.489" @ 1.73)

LSA = 113°

C/L = 115°/INT, 111°/EXH

From an old Crane Cams catalog article, here are specs on some other Ford engines:

[289CID - 2/4 Bbl]
Advertised Duration: 284°/INT, 258°/EXH
Duration @ .050" lift: 182°/INT, 180°/EXH
Gross lift: .368"/INT, .380"/EXH

[289HP]
Advertised Duration: 362° INT & EXH
Duration @ .050" lift: 232° INT & EXH
Gross lift: .478"

[351W (1969/70)]
Advertised Duration: 303°/INT, 317°/EXH
Duration @ .050" lift: 189°/INT, 190°/EXH
Gross lift: .425"/INT, .450"/EXH

[427MR]
Advertised Duration: 358° INT & EXH
Duration @ .050" lift: 228° INT & EXH
Gross lift: .525" INT & EXH

[429 SCJ]
Advertised Duration: 385° INT & EXH
Duration @ .050" lift: 232° INT & EXH
Gross lift: .515" INT & EXH

[429/460]
Advertised Duration: 290°/INT, 304°/EXH
Duration @ .050" lift: 190°/INT, 202°/EXH
Gross lift: .443"/INT, .487"/EXH

This thread, so far...

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Collapse <b>Factory cam specs</b> -- <font color=#0000ff>Derek66, <i>03/30/2002</i></font>

Factory cam specs -- Derek66, 03/30/2002

Collapse <a href=../ForumFE/reply.aspx?ID=12373&Reply=12368><img src=../images/reply.png width=30 height=10></a> <a href="#" id="anchor12373" onclick="return false;">Very interesting info, Derek. Thanks. :-) [n/m]</a> -- <font color=#0000ff>Mr F, <i>03/31/2002</i></font><script type="text/javascript">
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Very interesting info, Derek. Thanks. :-) [n/m] -- Mr F, 03/31/2002

Collapse <a href=../ForumFE/reply.aspx?ID=12375&Reply=12368><img src=../images/reply.png width=30 height=10></a> <a href="#" id="anchor12375" onclick="return false;">The MR specs from Crane are wrong....</a> -- <font color=#0000ff>kevin, <i>04/01/2002</i></font><script type="text/javascript">
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The MR specs from Crane are wrong.... -- kevin, 04/01/2002

Collapse <a href=../ForumFE/reply.aspx?ID=12381&Reply=12368><img src=../images/reply.png width=30 height=10></a> <a href="#" id="anchor12381" onclick="return false;">RE: The MR specs from Crane are wrong....</a> -- <font color=#0000ff>Derek66, <i>04/01/2002</i></font><script type="text/javascript">
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RE: The MR specs from Crane are wrong.... -- Derek66, 04/01/2002

I've posted them before... -- kevin, 04/02/2002