iron head capability
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From: fargo, nd
it would still have a noticeable idle, if youre looking for smooth id pick a little smaller one- something in the low 230's @.050 or less. what compression are you planning on running? if youre going to be 9.5-10 to 1 then 230 @.050 is about your limit on relatively smooth idle, if you were running higher compression you could run a bigger cam and still have a smooth idle, if you ran lower then your cam would have to be smaller to have the same idle.
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I want to the highest compression i could get away with and still be able to run 93 octane pump gas. My original inclination was 11:1 or around there but if what you guys say is true and 10:1 is as high as you could go then 10:1 is what i'll be shooting for. Also, i'm not looking for a smooth idle either, my Fe 422 with the XE274 (230/236 .562/.565)has a really cool sounding idle so something like that but in the 545 i want to put as much cam as possible and still have good torque on the low end and mid range, i'll also probably use a 3000 stall, i just dont want the thing to have to idle really really fast like a race car, 700 or 800rpm or less
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I think it all depends on what size heads you will be using, as with my 97cc heads I once was going to use the Keith Black 401 dome pistons which run 11-1 compression and stated for use with Premium fuel with the 97cc heads ( that was in a high performance 460ci ) Now that I have gone to the Scat 557ci with the Probe Flat top forged pistons compression is around 10 1/2 to 1, as it seems the heads with the larger combustion chambers can use premium fuel with the high compression pistons for some reason....
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From: fargo, nd
the big chamber heads lower the static compression, a big cam lowers the dynamic compression (which is what matters for fuel choice). i wouldnt chance 10.5-1 on iron heads without a big cam. 10-1 is the practical limit for iron and still be able to tow with it... if youre doing alot of towing then 9.5-9.8 is about it with a 180 thermostat. a 160 thermostat you could run a little higher compression with, but the cooler the thermostat the faster your engine parts wear. all kinds of considerations when youre building an engine. also flat top pistons with really tight quench will take more compression than dished pistons
Last edited by darrin1999; May 8, 2007 at 07:19 PM.
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The camshaft I am using is The Ford Racing M-6250-C460, which has 595/620 lift, as far as I know its the biggest hydraulic camshaft I could find, as I did not want to run a solid cam, maybe further down the track I might go to a larger cam ( solid ) for a bit more performance with my 557ci rebuild, My car ( XE FALCON ) is for performance only , it runs a 4 speed Toploader gearbox and 9' rear 31 spline axles 3-5 ratio, Jamie. There is a picture in the photo gallery.
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thats pretty much where im at right now too. i'd like to build a good strong motor with a good bottom end now and then when i get more money and it's time to build it again in a couple of years i'd want to put aluminum heads and roller valve train (solid). On the comp cams web site i was looking through cams and there is a marine cam listed with 254/258 duration but it has less lift like .588/595 or something. So which one would be more aggressive, the one with longer duration/less lift or more lift and shorter duration? I think there is also a couple hydraulic drag race cams from comp in the 260 degree range but they are single pattern cams which i dont think would benefit the 460 iron heads much. That Ford racing cam sounds like a good cam though for this application, though i think we could get away with a little more duration but im sure the c460 cam would put ya close to 600hp which is my goal.cool car by the way jamie
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Mychal, cam specs for the Ford Racing camshaft are 595/621 lift, Duration is 310 inlet and 320 exhaust, @ .050 244/254. One thing I have learnt on this site is that a camshaft with more duration on the exhaust is better suited to the big 460ci engine. When my 557ci is put together I hope to have 650-700 horsepower, I will be using the Victor intake 2965 with a 1050cfm or 1150cfm Holley Dominator carb, happy to hear you liked my 1983 XE Fairmont, Cheers Jamie , Australia.
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well i searched around for cams besides the ford racing cam and found one very similar from Lunati its just slightly hotter cam card reads as follows: adv duration 295/305 245/255 @ .050 .615/.621 lift with a 110 degree lobe speration angle. Another one I found was an xtreme marine cam from comp and it reads adv duration 298/316 254/264 @ .050 with .585/.588 with a 112 lobe seperation angle. I have to ask which is more aggressive, the Lunati and ford racing with more lift and less duration or the comp with longer duration and less lift and which of these would suit the big stroker the best? I will also use the Victor intake with 1000+ cfm holly or demon. probably the last question i ask before i let this thread die off
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From: fargo, nd
the longer the duration the worse the idle and higher the powerband. more lift increases power across the board. what specifically do you want to use it for? if you are just racing it then youll want lots of duration, if you want to actually use it you want less duration and more lift.
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Originally Posted by darrin1999
...the d0ve heads are adjustable, as are the c9ve and c8ve- the d3ves are not but can be machined to be.
Paul
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