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Old March 28th, 2007, 04:36 AM   #1
PINKY
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Default 460 build up

i got a 460 in my yj and im looking to upgrade the interals need more torque i want to be able to light all four from a stand still not really to sure what to upgrade or change its a 78 if that helps any any help yall can give me would be greatly appreciated

Justin

im kinda new to working on fords i mena i had a few lincolns and now have a topaz as a dd tweaked the lincolns a bit a 84continetal 5.0 slammed to the ground and a 95 towncar 4.6 lifted and bfg at's

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Old March 28th, 2007, 08:47 AM   #2
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Iw ould try and get your hands on a set of D0ve-C HEads, they are closed chamber and will increase your compression ratio. Your heads right now probably are in the 95 cc combustion chamber size, and the D0ve's are in teh 76 cc area.
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Old March 28th, 2007, 08:25 PM   #3
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theres only one problem with Dove heads...11:1 compression. if you can afford 93 octain gas then its ok, but your talking about an engine that gets 9-10 mpg. theres loads better ways to make power without getting shorted at the pump.
I found a long time back the best cams for ford engines were the older factory cams, the only thing they lacked was valve lift. Jack Roush wrote an artical about 29 years ago about how to get more power out of these engines. he bored out a 429 Boss and used a 288 int./290ext. .790 lift cam in his engine. he was pushed out to 614 cubes and running twin 1040 cfm Dominators carbs on a custom intake. it made 1170hp on carbs without Nos. the artical made me do some work on my drag cars engine. I used a 4* crank key to retard the cam at the crank drive gear. my engine had a stock 257/260 cam w/.438 lift (stock for the N 429 w/360hp) after I backed up the cam I had more low end but nothing above 5500 rpm. so I played with a couple of cams till I found a ford 300/306 .490 lift it was the stock Super cobra cam. but if you set it up with the -4 at the crank you couldn't keep trannys together. I scattered 8 C6s in one summer. I finally settled on a trans built by Mayfairs in Taylor. Clyde Detrich was using the same trans set up in his 8 second truck. I still broke it so I upped the cam timming back to stock and stayed there. it was easier on parts that way. its funny you wouldn't think a cam key could make that much difference. now they sell timing gear sets with a crank gear pre cut for the +/-4* made into the set up.
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Old March 29th, 2007, 09:08 AM   #4
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460 in a tj sounds fun. Your 78 460 in stock form is a 8:1 motor. A set of dove heads on a 78 block brings you up to between 9:1 and 9.5:1, good start for torque. Keep in mind dove heads were made for Leaded fuel and need to have hardened exhaust seats installed to live on unleaded gas (I learned this the hard way on my first set of dove heads).

I am running a 71 block (which has a .015" shorter deck height than the 78), stock crank, truck/cj rods with the football head bolts, trw 2404 pistons .030 over, dove heads with oversize valves and the exhaust ports opened up, crane cam 288 I 292 E .530 lift, roller rockers, stealth intake, L&L headers.
Compression ratio on this combo is 10.2:1 and it runs fine on pump premium.
I'm running this in a full size bronco that is 6500# trail weight with 38's. It is well manored on the road or trail. On pavement it will melt the tires in 2wd but in 4wd it just hooks and leaves. I'm guessing in a 3500# tj it would be a handfull.
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Old March 29th, 2007, 01:56 PM   #5
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so it seems that everyone is telling me that i need to cam it i figured i would do that one right from the start all the cams you guys mentioned seem to be high lift short duration. im not looking to to turn my yj into a drag jeep. and maybe lighting all four tires from a stand still is a bit much its not needed. the tranny im running is a smc456 (i thinks thats what it is ) a 205 t case 70 rear and a little 44 up front. i will be upgrading the front here shortly to a 60
custom home brew drive shafts that i know im crinkle since they are 1310 and all . but i need to get this thing doing so it didnt end up like my last jeep project thats still sitting in the drive way . running 44 gumbo's on the street and 36 super swampers on h1 rims on the trails. so i wnat something that can get me where i wanna go i also wanna run propane so i dont have to worry about carbs and angles my buddy has too many problems with that i wanna keep shit simple to work on but reliable and strong.
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Old March 29th, 2007, 08:57 PM   #6
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when you look at at the higher lift short duration on the cams its not about RPM. the fact is that ford uses huge valves. when they only open .438 into the chamber they don't let much in. when you open the same valve .750 its a huge dif. an example would be the 73-74 Pi head that used small ports with open chambers and cobra valves(2.25 int/1.89 ext) they flowed great but the cam sucked! it only opened the valve the .438 + the rockers ratio of 1.7:1 the engine was only rated at 225hp back then as compaired to the older high compression engines that were 360hp with worse heads. the other huge change was the first intake opening is degreed out of spec. the better ones start around 12* the later ones around 30* to retard the cam. it made a huge loss in power but made emmisions without re-tooling the cams. the pin location on the end is drilled different so don't use the stock cams after `71 they suck.
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