598 C Head Motor build up

I just finished building my 598 c head motor the build up consist of
eliminator premier block
crower 4.5 billet crank with short snout
GRP aluminum rods 6.650 long
je 4.6 pistons with .043,.043.3.0mm ring package
Comp 60mm swap firing order cam 289 in 304 ex with a 115 lobe sep
crower offset lifters, trend .140 wall 3/8 push rods, psi valve springs 385# on the seat 1140# open
C 460 fully cnc ported heads flow 500 int 350 ex
Victory 2.400 titanium valves on int 1.888 titanium exhuast
belt drive, 5 stage dry sump peterson 5 stage bear claw oil pump
c line oil pan custum made to my specification with alot of kick out motor is 15.1 compresiion 960 lift on int 920 on ex. jesel 1.85 /1.8 rockers. tfs cast tunnel ram int with c evans adapter spacers motor has twin fogger system and 2(gas) holley 1050 hps on top of it. evrything has been fully ported and matched motor has very little ring drag and held 13 inches of vaccum at 7500.
i just finished running it on my dyno and it made 1080 hp at 7600 rpm and 800 lbs at 6800 rpm. the brake specific was .47-,48 through out the entire run , the timing i tried from 28 to 34 and it didnt really matter, the thing made to the brake 767 foot lbs and 1032 hp the humidity that day was low at i think somewhere down in the 40 range and the barometric presuure was 29.70 i have to go and look at the dyno sheets any ways the correction factor was 1.046 the thing made 800 lbs corrected and 1080 corrected hp. while i think this is very good on my dyno out of a 598 cubic inch motor it makes as much hp as my 632 and 648 chevy motors with big chief heads that i have built in the past the torque was down but it has a smaller arm then the 632's and 648's. However, it is nowhere near the 1150 and 1170 range that i see posted hear all the time my dyno has been known to not give out free horsepower it is usually about 40 hp down as sum of our costumers have taken the motors to other shops and typically make 40 to 60 more. well im not really into racing dynos any ways . i made 30 pulls on the thing ran all the way up to 7800 rpm then started going the other way as big as the runners are on this thing i expected it to carry a little longer my point here is just that im wondering how these other build ups that i have read about that have no dry sump or vacuum pump make almost 100 more hp then this motor i wondering maybe im missing the boat. i do about 120 motors a year and have been very succesful in circle track and most of the drag race motors we do run very well here at the local tracks. i expected a little more out of the motor as much as the heads flow and the valve location and the the port and combustion chamber design there is alot of potential there but i dont know where these extra 100 horses people typically are making could be found. well im very happy with the 598 it didnt feel lazy as i pulled it on the dyno and it accelerated strong up to 7800, then i had to start cutting of the water on the brake. well just wanted to share my experience with you guys im a die hard ford guy and ill be posting pics here so guys can see what the build looks like

thanks for sharing with us! You may want to speak with Lem, Charlie and/or Phillip who have a lot of experience with these big engines.

Good Luck!

With that kind of head flow and intake valve, It could use a bore of atleast 4.65" or more. The one I 've run is similar to yours except 4.7" bore and made 930Ibs and 1150+hp. Happier Dyno, I don't know! Your combo might just need alittle tweaking. I'am guessing the twin foggers will kick it in the butt!!!

i played with the desktop dyno, (i know it's not real world but there's people to say that it's pretty close to real world numbers,) and i played around with the same combination thus exact same airflow and was able to get 1074 horsepower and 858 ft lbs of torque with a single plane cast motorsports "C" intake.

i know it's a desktop dyno but there's a fellow here by the name of bobby small and he made 1080 horsepower with the single cast intake with the same combination as yours but without the vacuum pump. with a smaller camshaft.

i'm willing to bet (figuratively) that the culprit is the camshaft. i plugged in 284 duration at .050 on the intake and 290 on the exhaust with 113 lsa and retarted -9 degrees. it made more horsepower than with intake duration at 289/304 on the exhuast.

you probably will make more horsepower by using 2 1150's opposed to the twin 1050's that you are using.

but i imagine your combination will respond much, much better with n2o with your current cam.

but if you're looking to run n/a, a smaller cam will be better suited.

i know the real experts will chime on here to correct me and add pointer to you and thats fine with me because we all are still learning. :)

nice combination mate, pretty close to mine and makes roughly the same power and torque also

here are some pics of my motor

[/img]http://i158.photobucket.com/albums/t103/598mustang/Picture001.jpg[/url]

http://i158.photobucket.com/albums/t103/598mustang/Picture003.jpg

Nice engine :!: The first thing I would suggest....1150 modified carbs....billet metering blocks/boosters etc should be good for power .
IMO , out of the box 1150s would be a plus . The @ .050" duration on the intake lobe is bigger than the stuff I spec. That does not mean what you have is wrong .

I DON'T KNOW IF ITS JUST THE PICTURE , BUT THE #2 CYLINDER EXHAUST PORT LOOKS WET WITH OIL ITS DARKER THAN THE REST,COULD BE A PROBLEM THERE. MIGHT JUST BE THE LIGHTING IN THE PIC THOUGH NOT TIRE KICKING JUST AN OBSERVATION. NICE PIECE THOUGH WHAT SIZE LIFTERS DO YOU HAVE IN THAT MOTOR? AND WHY ONLY 3/8 PUSHRODS SEEM KINDA SMALL FOR THAT BEAST BUT MAYBE WITH THE LOW RPM RANGE IT WILL BE FINE. MY 518 WILL HAVE .937 LIFTERS WITH AN .850 WHEEL WITH A 60 MM BIG LIFT CAM. WITH YOUR CAM SPECS AND A 1.85 ROCKER YOUR'E WELL OVER 1 INCH OF LIFT WITH THAT THING TOO. SOME TIMES YOU ALSO HAVE TO TRY SOME DIFFERENT INTAKES BEFORE YOU GET A GOOD ONE NOT SAYING YOURS IS BAD BUT IF YOU CAN GET YOUR HANDS ON ANOTHER ITS WORTH TRYING. I SECOND THE FACT OF MAYBE GOING TO SOME BIGGER CARBS PRO SYSTEMS IS THE BEST PATRICK KNOWS HIS STUFF.

its a 904 lifter and the cam is a 289, 304 960 int, 930 ex and the pushrods are 160 wall thick and after loading the valvetrain i only lost .015 valve lift so i know its not flexing that bad ive lost up to .050 thousands on high spring pressure motors and the pushrods typically dont break on those motors so im not too worried about it. The motor had 14 inches of vacuum at 8000 rpm so i know she is sealed good, the motor was leaked down and it had less than 5 % also on some motors when you let them idle for a while the ports will oil up also i dont run seals on the exhaust valves as the springs that i have (Triples) dont give you too much clearance for valve seals so that why there might be some oil in some of the ports but thats very typical in these types of applications im sure bigger carbs might help me out maybe 10- 20 hp and an intake might be a few hp better but i can make that up with the nitrous. i built what i could afford and i cant afford a 5000 dollar intake so if im a few hp down it wont keep me up at night

412yates

Thats one good looking motor you have there, what are you going to be stuffing that thing in? Give Lem a call about a camshaft spec My duration and lobe separation sounds pretty close to yours but the lift was only 830 ex with 1.8 and 860 int with 1.8 rockers. We r&d the cast A460 manifold on my 598 with 2 1150 QUICKFEUL carbs that Phillip Oakley had built for the deal and with a happy dyno or not it made 897 tq at 6100 and 1148 at 7600. With the cast C manifold it made 876 at 5700 and 1082 at 7100 with a 1250 QUICKFUEL carb. Check it out in the Engine tech part of this
forum under Local Man Does Good.

Bobby Small

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