'93 Formula "Sleeper"

[meissen]

GM847 is about as wild of a streetable cam as you can go...

GM847: (234/242 .575/.595 112lsa) w/ 1.6RR's
The largest cam of the bunch. Over the years it has proven itself as a cam that puts out good numbers and good track times. Very strong mid-range and top-end with some low-end loss. Will put out slightly better numbers than the cc306 while exhibiting similar drivability. Not recommended for cars that are daily drivers or that have stock bottom ends/heads due to its large size in duration. Stock heads don’t allow this cam to be used to its full potential so one with a built bottom end and head work would benefit greatly from this cam. Automatics require high-stall converters and gears and 6-speeds require steep gearing to run this cam successfully. Degree of cam surge will be determined by how good the tune is, stall size/gearing etc.
Pass Emissions?: No
Shift Point for Maximum Performance: 6400+rpm
Idle Characteristics: Very Choppy Idle
M6; Require Gears?: Yes
A4; Require Stall?: 2800+ Stall Speed

[93formulalt1]

I've never had a GM847, but everything I've ever heard about it leads me to believe it's a big cam for a street-driven 355 having mostly top-end power, like from 4000rpm+. My dad has a hydraulic roller cam in a 355 SBC that's similar in size to the 847 in his older corvette and even with a 3600 stall that thing is a dog until about 4,500rpm. For what you're looking for I'd give serious consideration to an AI cam like Joel's if you want midrange power. It has a good lope to it from the videos he's posted.

Thanks for the info, I'll look into it. Didn't know a whole lot about the GM847, just what I've heard from friends. How about a CC305 or something along those lines? This is going to be a stock cube LT1, I'm not doing a full rebuild yet.

[meissen]

I'd really recommend going to Advanced Inductions like Joel did and talking to them. I really like Joel's cam and if I could have done it all over again I would have gone that route for sure -- and I believe it was cheaper buying it as a package, too.

[93formulalt1]

GM847 is about as wild of a streetable cam as you can go...

GM847: (234/242 .575/.595 112lsa) w/ 1.6RR's
The largest cam of the bunch. Over the years it has proven itself as a cam that puts out good numbers and good track times. Very strong mid-range and top-end with some low-end loss. Will put out slightly better numbers than the cc306 while exhibiting similar drivability. Not recommended for cars that are daily drivers or that have stock bottom ends/heads due to its large size in duration. Stock heads don’t allow this cam to be used to its full potential so one with a built bottom end and head work would benefit greatly from this cam. Automatics require high-stall converters and gears and 6-speeds require steep gearing to run this cam successfully. Degree of cam surge will be determined by how good the tune is, stall size/gearing etc.
Pass Emissions?: No
Shift Point for Maximum Performance: 6400+rpm
Idle Characteristics: Very Choppy Idle
M6; Require Gears?: Yes
A4; Require Stall?: 2800+ Stall Speed

Yeah. . . I should have done more research before I started throwing cams out there. . . lol Dan told me to do it. haha

How about the Comp Cams XFI 466? 218/224 .570/.565 113lsa, seems like a decent cam, not too much lope, decent mid-range and top end power. . . I would probably go with PAC 1218 single beehive springs, LS7 lifters, TrickFlow Chromoly pushrods, and the 1.6RR's I already have. I'll likely be getting an electric water pump, replacing the optispark, and installing a new timing chain at the same time, as well as a TC.

I think this would be ideal, because it has a smooth idle, which would be perfect for a "sleeper", but makes decent power. With all the right supporting mods, I don't think 350hp at the wheels is impossible. That is right about where I want the car to be when I'm done.

[birdie2000]

Another thing to also consider doing is have your head porter pick out a cam if the person doing it is a professional. He'll know what his heads will want if he's done this more than a couple times.

[meissen]

Yeah. . . I should have done more research before I started throwing cams out there. . . lol Dan told me to do it. haha

How about the Comp Cams XFI 466? 218/224 .570/.565 113lsa, seems like a decent cam, not too much lope, decent mid-range and top end power. . . I would probably go with PAC 1218 single beehive springs, LS7 lifters, TrickFlow Chromoly pushrods, and the 1.6RR's I already have. I'll likely be getting an electric water pump, replacing the optispark, and installing a new timing chain at the same time, as well as a TC.

I think this would be ideal, because it has a smooth idle, which would be perfect for a "sleeper", but makes decent power. With all the right supporting mods, I don't think 350hp at the wheels is impossible. That is right about where I want the car to be when I'm done.

Not to say mine is a great comparison, but mine is only making 325hp at the wheels with a more aggressive cam.

[93formulalt1]

Not to say mine is a great comparison, but mine is only making 325hp at the wheels with a more aggressive cam.

Really? Dang. . . What would that cam (with 1.6RR's, 3200 RPM converter, 3.73 gears, on street tires) run in the 1/4? I'm looking for high 12's-low 13's, I think the car would be a high 13's car as it sits. . . I would hope that ported heads & intake, upgraded valvetrain, and a mild cam would get it to run at least low 13's, especially with full bolt-ons. . .

[mcalus]

Call lloyd Elliot and tell him what you want. He can custom grind something for you that makes great power and still sounds stock.

[93formulalt1]

Call lloyd Elliot and tell him what you want. He can custom grind something for you that makes great power and still sounds stock.

Will do, I remember running a few questions by him a year or so ago, very knowledgeable. . . LE is amazing. I'll let you all know what his recommendation is.

[93formulalt1]

I'm in need of a stock stereo bezel, does anyone have one laying around they wouldn't mind selling? I hacked mine apart to make the 2DIN fit, looking to go with a single DIN head unit.

[c0ncEpT]

1st thing I would do performance wise is put a converter in it. 3600-ish would be nice(Yank SS3600). Single best mod you can do for any automatic car.

[93formulalt1]

1st thing I would do performance wise is put a converter in it. 3600-ish would be nice(Yank SS3600). Single best mod you can do for any automatic car.

That's what Meissen was telling me, that a converter would make the car a lot more fun to drive, and would compliment all current and future performance mods nicely. . .

Im looking for a deal currently, should be ready to pull the trigger on that in a month or two.

[93formulalt1]

1st thing I would do performance wise is put a converter in it. 3600-ish would be nice(Yank SS3600). Single best mod you can do for any automatic car.

If I install a converter and trans cooler at the same time, do I need to have the trans rebuilt to handle it? I've been reading online that the 4L60/700R4 can't handle much abuse, and should be rebuilt, but honestly, that's not going to happen anytime soon. . .

[c0ncEpT]

If I install a converter and trans cooler at the same time, do I need to have the trans rebuilt to handle it? I've been reading online that the 4L60/700R4 can't handle much abuse, and should be rebuilt, but honestly, that's not going to happen anytime soon. . .

A converter isn't going to make your transmission blow up any sooner as long as you keep the temperatures in check. If you have a healthy trans I would go for it. But if you already have 100K+ on it I wouldn't expect it to last to long before it needs refreshed.

[JoeliusZ28]

I would echo what everyone else is saying about the cam except for you im not going to. My best recommendation for you nick is to save all engine work other than a stock rebuild for the very last. Get the rest of the car where it needs to be. I may be different than many people, but id rather have something nice than something fast, unless its an autocross/drag beater. Tuning a modified engine can be frustrating enough for many people to give up entirely, and thats easy to do if you arent happy with the rest of the car before you even start.