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post #1 of 23 (permalink) Old 11-28-2010, 07:21 AM Thread Starter
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Smile Anyone with 557 cu.knowledge awake now

Need someone to talk to today!

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post #2 of 23 (permalink) Old 11-28-2010, 08:06 AM
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557

Thats what I am running. What do you need to know ?

Mark
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post #3 of 23 (permalink) Old 11-28-2010, 08:16 AM Thread Starter
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Smile good mornin!

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Thats what I am running. What do you need to know ?

Mark
Well concerned about heads,carb got 1150 dom (holley) and dont want it leaning out and hurting motor.
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post #4 of 23 (permalink) Old 11-28-2010, 08:21 AM Thread Starter
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com

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Well concerned about heads,carb got 1150 dom (holley) and dont want it leaning out and hurting motor.
cause a guy i know ran his 572cu on the dyno and leaned out and hurt 1 piston, does porting intake ,polishing help alot with this problem??

Last edited by JT557; 11-28-2010 at 08:23 AM. Reason: typ o
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post #5 of 23 (permalink) Old 11-28-2010, 08:27 AM Thread Starter
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still there????
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post #6 of 23 (permalink) Old 11-28-2010, 08:32 AM
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557

Just because a guy hurt his engine with 1X50 carb doesn't mean yours will get hurt if it is set right. A dyno is where this will show up before it gets hurt. I run a 1250 on mine but I was looking for max HP. A friend of mine runs a Mopar 572 and ran a 1050 on the dyno and didn't hurt it at all and made good HP. The 720hp 572 BBC crate engines come with 1095 demons so it really has nothing to do with carb size but the tuning ability of you or the dyno guy. Porting/polishing actually make more air flow which would worsen a lean condition if anything but probably not noticeabley. If the carb is set right and you have pyros and the A/F hooked up correctly I cannot see why anything would get hurt. If it shows lean richen up the carb with bigger jets. A 1150 dominator will run just fine if it is set right and in good shape. Don' sweat it. What heads are you running, comp ratio, cam specs ??? I was typing while you were !

JMO Mark

Last edited by Mark Laczo; 11-28-2010 at 08:34 AM. Reason: Added info.
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post #7 of 23 (permalink) Old 11-28-2010, 08:39 AM Thread Starter
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I'm going to run the scj re revised c head (i think that's proper terminology) with 717 lift 284 dur.110 lobe sep. heads maybe right out of box, with hevier springs and cheating lift with 1.75 rockers.. instead of 1.73 rockers

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post #8 of 23 (permalink) Old 11-28-2010, 08:48 AM
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557

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I'm going to run the scj re revised c head (i think that's proper terminology) with 717 lift 284 dur.110 lobe sep. heads maybe right out of box, with hevier springs and cheating lift with 1.75 rockers..
We just call it the new Ford SCJ or Kasse designed SCJ with revised valve pierce points. I think there are SCJa's & SCJb's but that is just a different spring packages maybe, there is a SCJc option. The actual "C" head is different animal all together. The 1.75 ratio compared to 1.73 ratio isn't much of a jump its like .008" so if you already have the 1.73 stay with them. 1.80 would make a more substantial gain like .029" or so. Or just run it and after you get the heads ported later put a larger custom cam in it.

JMO Mark
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post #9 of 23 (permalink) Old 11-28-2010, 08:55 AM Thread Starter
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Originally Posted by Mark Laczo View Post
Just because a guy hurt his engine with 1X50 carb doesn't mean yours will get hurt if it is set right. A dyno is where this will show up before it gets hurt. I run a 1250 on mine but I was looking for max HP. A friend of mine runs a Mopar 572 and ran a 1050 on the dyno and didn't hurt it at all and made good HP. The 720hp 572 BBC crate engines come with 1095 demons so it really has nothing to do with carb size but the tuning ability of you or the dyno guy. Porting/polishing actually make more air flow which would worsen a lean condition if anything but probably not noticeabley. If the carb is set right and you have pyros and the A/F hooked up correctly I cannot see why anything would get hurt. If it shows lean richen up the carb with bigger jets. A 1150 dominator will run just fine if it is set right and in good shape. Don' sweat it. What heads are you running, comp ratio, cam specs ??? I was typing while you were !

JMO Mark
ok im a little slow with this comp stuff do i got you now???
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post #10 of 23 (permalink) Old 11-28-2010, 08:57 AM Thread Starter
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Quote:
Originally Posted by Mark Laczo View Post
We just call it the new Ford SCJ or Kasse designed SCJ with revised valve pierce points. I think there are SCJa's & SCJb's but that is just a different spring packages maybe, there is a SCJc option. The actual "C" head is different animal all together. The 1.75 ratio compared to 1.73 ratio isn't much of a jump its like .008" so if you already have the 1.73 stay with them. 1.80 would make a more substantial gain like .029" or so. Or just run it and after you get the heads ported later put a larger custom cam in it.

JMO Mark
are you there?
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post #11 of 23 (permalink) Old 11-28-2010, 09:02 AM
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doesnt matter if the carb is too small. Leaning out has nothing to do with the size of carb, its how you meter the air to fuel ratio.

Despite what you've heard, opportunity does not knock
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post #12 of 23 (permalink) Old 11-28-2010, 09:03 AM Thread Starter
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Smile

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are you there?
OK, no i don't have the 1.73's yet and the comp. ratio will be 14.5 to 1hope fully putting me at around 800 to 850 horses.is that close???
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post #13 of 23 (permalink) Old 11-28-2010, 09:06 AM Thread Starter
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Smile com.

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doesnt matter if the carb is too small. Leaning out has nothing to do with the size of carb, its how you meter the air to fuel ratio.
do you mean fuel and air mixture screw adjustment?
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post #14 of 23 (permalink) Old 11-28-2010, 09:21 AM
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557

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OK, no i don't have the 1.73's yet and the comp. ratio will be 14.5 to 1hope fully putting me at around 800 to 850 horses.is that close???
Yes that will be close if everything is optimised. I have my 557 in the engine build up section if you care to read about it, it may help you some.
https://www.460ford.com/forum/showthread.php?t=147796
FWIW Mark

Last edited by Mark Laczo; 11-28-2010 at 09:23 AM.
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post #15 of 23 (permalink) Old 11-28-2010, 09:57 AM
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I'd use the correct ratio rocker arm that yields the best geometry rather than what gets you the most lift. Make the cam fit the rest of the combo. Carb will be fine, its more about the fuel curve than the cfm.

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