FE Power Forums
FE Power Forums => FE Technical Forum => Topic started by: sixty9cobra on September 30, 2017, 02:20:03 PM
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Hi guys looking for recommendations for a solid roller camshaft for my 464. Engine builder recommends Lunati solid bushed roller lifters he says they seem to survive well on the street. Engine specs are 10.5 compression CP pistons,4.25 forged scat crank, scat rods, Erson rockers, Barry R stage X heads flows 330 intake, MSD dist fixed advance, Edel Victor port matched, Hooker 1 3/4 , 3" exhaust. Holly 850, TKO-600, aluminum flywheel, 411 gears car weighs 3500 without my fat butt.
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How high are you wanting to turn it? Need vacuum?
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No vacuum, no pcv I have hydro boost and I am adding vacupan. I not looking for a screamer 6500 is fine. I would be happy around 600hp.
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Harry, I'd be looking at the Comp Cams Xtreme Energy Street solid roller series. Probably a 4875 lobe on the intake (286 advertised, 248 at 0.050, lift about .675), and a 4876 on the exhaust (292 advertised, 252 at 0.050, lift about .685). Probably a 110 or 112 LSA, with the intake centerline at 105. Ought to make your 600 HP with the heads you've got.
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I'd be a custom Comp here too.....a little different specs though for a 6500 rpm peak. I have a few out there in ~460 inch FE's and the specs would just need mildly tweaked to work with how the Edelbrocks flow.
255/262 @ .050", .674"/.674", 108 LSA on a 104 ICL.
"Street lobes" here as well, don't need a spring eater lobe. You don't want a cam that will require a lot of spring pressure as you'll be pulling the rocker studs out of the heads.
The bushed lifters from Crower/Isky/Morel would be fine. Pressure fed needle bearing lifters would last a long time as well.
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Harry, good advice here, and Brent's cam would be real strong, but I'd likely ask one more question. Do you want a 6500 RPM peak or shift point?
I think Brent's cam would like to see a shift closer to 6800-6900 and Jay's closer to 6400-6500, so it depends what you are looking for.
FYI - Our entire cars are pretty close now and my cam is pretty close to Jay's cam, but only .600 lift (solid flat tappet) It's not radical with 24 more cubes, but if you are looking for something a little more snorty but the lower shift point, you could tighten the lobes a little too. I haven't had mine on a dyno, but 640-6500 is about where the shift feels good
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I don't have a shift point in mind I have never shifted past 6500, I have a 6600 chip in it now and never hit it. This cam is all done by 6000. I am cam shaft ignorant no clue except big duration means lopy idle. With a forged crank I guess 6800-7000 is reasonable. I just worry about the Ersons hanging out around 7000.
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Ross was right in asking for clarification on what the 6500 number meant.....peak or shift....
The Ersons will go there, no problem. I did a 428 with Edelbrocks, a mild solid roller, 11:1 compression, and a Tunnel Wedge that would pull to 7000. It had Erson rockers on it and I used about 525 lbs open pressure.
IMO, you have the setup to support a 6500 rpm peak and a tighter LSA with an early intake centerline will help with the bottom end.
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I have no problem going to 7000 just have to get used to revving it that high.
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It will go quick. ;)
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how long does it take to have a custom cam ground? After eating the last crank and 2 rods it seems I also had a main bearing turn in the register also. Doesn't the main feed the rod journal? That makes me wonder what caused that failure
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About a week to week and a half.
Yes, the main feeds the rods. Which main was it?
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If you want to get the most out of your combination with the least amount of cam call Chris Straub. I also don't recommend bushing lifters for the street. They are not a drop-in and forget, be all, end all lifter. They are very sensitive to dirty oil and they are a maintenance item. They will wear, just like a bronze dist gear. You'll get better service out of a quality needle roller. Morel would be my first choice.
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#4 main. Taking in all advice thanks guys appreciate the input.
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Could be several things....cracked main journal, wrong clearance, detonation, etc. Pretty bad to spin a bearing though.
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Could be several things....cracked main journal, wrong clearance, detonation, etc. Pretty bad to spin a bearing though.
Maybe add possible cracked oil feed from cam to bearing, as this seems to occur commonly on drag raced blocks.
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Yes sir, another good possibility.
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Block is OK it has been checked out.