460 compression ratio?
#1
#3
460 compression ratio?
I'm thinking about going to 9.5:1 also, Elevation here is around 2800ft and just goes up from there. I didn't want to have to run premium in it though, so I'm not sure if I could get away with 9.5:1. I can't seem to find anyone running 9.5:1 around here. Most people that I find running a 460, it's either stock, or they have no idea.
Thanks
Todd
Thanks
Todd
#4
460 compression ratio?
I'm running about 10.7 in my 460 on 93 octane gas. As far as elevation, I'm not sure. I'm in SouthWest Michigan. I haven't had any problems with pings, I'm running about 6 degrees at an idle, I don't know about total advance. I think I'm gonna back mine off to about 5, maybe 4. It's running very good as it is so I may just leave it. I'm not sure. Good luck.
Rob
"Stuck with a m*par, Settle for a ch*vy, Happy with a Ford!!!!"
Rob
"Stuck with a m*par, Settle for a ch*vy, Happy with a Ford!!!!"
#5
460 compression ratio?
Run a consevative 9.5-1 comp. at just above sea level, about 200ft. up to 3500ft. or so. Total advance is in the 36-38 deg. range but comes in quicker with lighter springs in dist., only run 92 or better with nothing but more power than I thought I would have! Engine is .040 over with mild Crane cam(204-216 dur. @ .050, lift is .487 and .518), roller rockers on D0VE-C heads(lightly ported) and stainless steel valves(stock size), Offy dual-plane 360 deg. intake(should have gotten a Weiand Stealth, hint, hint!!), Elde. 750 carb and Hedman Elite fenderwell exit headers with Jet-Hot coating, and a pair of Flowmasters with a cross-over just past the collector rounding out the affair. Have yet to hear a ping or even a hint of one with just over 1.5K on the engine @ 6-7deg of intial timing. Also run a C-6 with conv.(TCI unit) stall speed around 1800-2000 rpm.
#6
460 compression ratio?
Thanks for the info.
I will probably go with the 9.5:1. I just don't think I will have any problems at the elevation I'm at.
Have you ever tried to run 87 Octane to see if it pings?
I have heard nothing but good things about the Stealth manifolds. I still have to buy one and couldn't decide between that one or the Edelbrock Performer. I found a comparison some guys did among many intake manifolds on the 'net and the Stealth ranked higher in horsepower and torque over the edelbrock performer.
Apparently, you are also a believer in the Stealth manifold. I am starting to lean towards getting the Stealth manifold.
As far as cams go, I have a couple in mind, but they have a little more duration than the one you are running. I'm thinking about using a cam that has around 218 to 220 degrees duration at .050" (intake side).
Thanks
Todd
I will probably go with the 9.5:1. I just don't think I will have any problems at the elevation I'm at.
Have you ever tried to run 87 Octane to see if it pings?
I have heard nothing but good things about the Stealth manifolds. I still have to buy one and couldn't decide between that one or the Edelbrock Performer. I found a comparison some guys did among many intake manifolds on the 'net and the Stealth ranked higher in horsepower and torque over the edelbrock performer.
Apparently, you are also a believer in the Stealth manifold. I am starting to lean towards getting the Stealth manifold.
As far as cams go, I have a couple in mind, but they have a little more duration than the one you are running. I'm thinking about using a cam that has around 218 to 220 degrees duration at .050" (intake side).
Thanks
Todd
#7
460 compression ratio?
Hey Todd,
Never tried 87 octane, would imagine if you pulled the timing back a little, don't re-curve and of course leaned it out for your lofty elevation, should do just fine. Forgot to mention, run a Jacob's ignition(found this to be very, very good at "masking" knock and/or ping-just lose power!), still playin' with plug gap, doesn't seem to make much difference-have run anywhere from .55 up to .75 gap(now at .62-.63) on #45 autolites. Mine is set-up for low-end, Yeah, yeah, I know, D0VE-C's are more performance oriented! Wanted PI's, but couldn't find a set that I could afford! Don't rev that high, although I think it will do just fine up to 5k or a little beyond with the cam(haven't been there quite yet, although it keeps feelin' stronger and stronger!). This is in a '79 F-150 4x4, used the Offy for bottom end, but, the Weiand is also a 360 degree dual-plane. Went back and forth with this for a while and thought the stealth might lean towards a little more top-end than what I was lookin' for-BBF wasn't even started with the "shoot-out" when I decided(bummer!), I just couldn't wait! I should try the 87 octane, just put $66 in the tank this weekend! Of course it holds 44 gal. and took almost 40! Good luck with your project-Hope it goes as well as mine did or even better!! So far, gettin' a solid 12-13 mpg, but been takin' it easy!
Never tried 87 octane, would imagine if you pulled the timing back a little, don't re-curve and of course leaned it out for your lofty elevation, should do just fine. Forgot to mention, run a Jacob's ignition(found this to be very, very good at "masking" knock and/or ping-just lose power!), still playin' with plug gap, doesn't seem to make much difference-have run anywhere from .55 up to .75 gap(now at .62-.63) on #45 autolites. Mine is set-up for low-end, Yeah, yeah, I know, D0VE-C's are more performance oriented! Wanted PI's, but couldn't find a set that I could afford! Don't rev that high, although I think it will do just fine up to 5k or a little beyond with the cam(haven't been there quite yet, although it keeps feelin' stronger and stronger!). This is in a '79 F-150 4x4, used the Offy for bottom end, but, the Weiand is also a 360 degree dual-plane. Went back and forth with this for a while and thought the stealth might lean towards a little more top-end than what I was lookin' for-BBF wasn't even started with the "shoot-out" when I decided(bummer!), I just couldn't wait! I should try the 87 octane, just put $66 in the tank this weekend! Of course it holds 44 gal. and took almost 40! Good luck with your project-Hope it goes as well as mine did or even better!! So far, gettin' a solid 12-13 mpg, but been takin' it easy!
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#8
460 compression ratio?
where did you see this comparison (url please ) I've been debating the Performer/RPM vs. the Stealth for my 460 build-up. if the both perform the same I'm going with the stealh becuse it can get it 20$ cheaper. I'm working on a cheap speed project (trying to get a 4000lb. custom 2x4 ford bronco into the 13sec range)
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