cr 400 aussie head
Senior User
Joined: Feb 2004
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From: conway arkansas
well personally i havent had much experience with em, a freind of ours ran one in a 68 torino bracket car for years without problem before he eventually changed to a c-4, only reason he did was for the availability of parts, mostly a convertor of a higher stall speed, other than that, the damn thing lasted better part of 8 years in that ole car without a hitch that i know of
Postmaster
Joined: Aug 2001
Posts: 4,270
Likes: 5
From: Delaware
Originally Posted by jopey
I beleive Dan's question is more so the C4 was a small block tranny only, you have a big block trans bolt pattern.
Sure it was not a C6? Although you could have one of the stupidly rare block with both big and small bell patterns on it.
Sure it was not a C6? Although you could have one of the stupidly rare block with both big and small bell patterns on it.
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Laughing Gas
Joined: Jan 2006
Posts: 883
Likes: 7
From: New-brunswick,Canada
i read c4 history and information on google; (c4 and c6 automatic transmission info) and they said c4 have 2 bellhousing,large and small,and the large one fit on FE block or big block 460.I found it very interesting.
http://www.fordcobraengines.com/Tranny_suggestions.htm
http://www.fordcobraengines.com/Tranny_suggestions.htm
Postmaster
Joined: Aug 2001
Posts: 4,270
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From: Delaware
[QUOTE=mustang81]intake lobe 268 degrees/
218 degrees at 0.050 inch
exhaust lobe 268 degrees/
224 degrees/ at 0.050 inch
valve lift
(1.73:1 rocker) 0.494-inch intake/
0.494-inch exhaust
lobe seperation 110 degrees
QUOTE]
If I use an Intake Valve center line @ 106, and 9.29 Static CR, I come up with about 7.7:1 Dynamic CR. That should run on 89 Octane, and maybe even 87.
218 degrees at 0.050 inch
exhaust lobe 268 degrees/
224 degrees/ at 0.050 inch
valve lift
(1.73:1 rocker) 0.494-inch intake/
0.494-inch exhaust
lobe seperation 110 degrees
QUOTE]
If I use an Intake Valve center line @ 106, and 9.29 Static CR, I come up with about 7.7:1 Dynamic CR. That should run on 89 Octane, and maybe even 87.
Postmaster
Joined: Aug 2001
Posts: 4,270
Likes: 5
From: Delaware
Originally Posted by mustang81
static or dynamic what is the difference?
I calculated that the IVC for the 268H cam is about 60 degrees ABDC, if the ICL is 106 degrees. That closing angle means that the piston is far enough into the compression stroke, that the true CR is about 7.7:1. This is the Dynamic CR.
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Joined: Aug 2001
Posts: 4,270
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From: Delaware
Posting Guru
Joined: Dec 2002
Posts: 2,003
Likes: 2
From: chicago burbs
and the one i gave you in post #3,
http://raceabilene.com/kelly/hotrod/compression.html
there is a 351M/400, 429/460 bellhousing for the C4, Broader Performance lists it for for sale in the C4 parts section near the bottom. "This is an OEM bell that will adapt a pan fill C4 to 429/460 engines. Limited supplies." they come up on Epay from time to time.
Mustange81, i wouldn't get too nuts with decking the block and heads, you'll get yourself into a place that requires more than the friendly gas pump can handle. if that does happen, you could always just re-cam to one with a later intake valve close time i guess.
http://raceabilene.com/kelly/hotrod/compression.html
there is a 351M/400, 429/460 bellhousing for the C4, Broader Performance lists it for for sale in the C4 parts section near the bottom. "This is an OEM bell that will adapt a pan fill C4 to 429/460 engines. Limited supplies." they come up on Epay from time to time.
Mustange81, i wouldn't get too nuts with decking the block and heads, you'll get yourself into a place that requires more than the friendly gas pump can handle. if that does happen, you could always just re-cam to one with a later intake valve close time i guess.
Last edited by grclark351; Jan 18, 2007 at 06:32 PM.
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Laughing Gas
Joined: Jan 2006
Posts: 883
Likes: 7
From: New-brunswick,Canada
7.7:1 this is a good dynamic compression ratio? When they talk about cr i suppose they are talking about the static.You calcuated 9.29 my cr static.but when all the guys are talking about cr it the static?
Postmaster
Joined: Aug 2001
Posts: 4,270
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From: Delaware
Originally Posted by mustang81
7.7:1 this is a good dynamic compression ratio? When they talk about cr i suppose they are talking about the static.You calcuated 9.29 my cr static.but when all the guys are talking about cr it the static?
7.7:1 is OK Dynamic CR for Iron Heads without Quench. If you get much above 8.0:1 with your setup, you could be at risk for Detonation.
