ok well ive gotten a parts list together on what i still have to get for the engine... as of today, i have a world products MoTown 4 bolt small block bored to 4.185 .. im working towards a 427 sb. i have a hardcore racing rotating assembly in the mail at the moment, should be here quite soon.. comes with forged rods/crank/piston set, clevite bearings, and speed pro rings. heres what i have planned out

heads: trick flow 23 degree aluminum,215cc runners,2.08X1.60valves,67cc chambers
valvetrain: manley severe duty valves, crane gold race roller rockers (1.5:1), summit 4130 pushrods, not sure on lifters right now (suggestions!) manley double row true roller timing set.
cam: comp extreme duration: 218 intake 226 exhaust lift: .462 int, .48 exhaust.
manifold: holley single plane aluminum w/raised plenum
carb: holley 750 w/vacuum secondaries(already own on current engine
dual 2 1/2" exhaust with hedman tork-step headers
if someone could run this combo through desktop dyno thatd be great.... and again please suggestions/advice is good! :chevy

EDIT: oh.. and 10:1 or so compression


:lol:


[Modified by couldbefun, 8:07 PM 11/27/2002]

 

Looks like a killer long block you're going to have there.

Not sure what all you are planning to do with it, but whatever it is, it won't be at very high rpm. That cam is SMALL by even 350 stds. I think it's going to take a lot more cam to feed it. You are in the same relative boat I and several others are in with the 540's. You have to seriously reconsider the type of numbers you are used to as far as cam and heads are concerned.

I'd definitely look at cam and I wouldn't be afraid of larger heads too, but you're a lot closer there than on the cam.

Not sure of the Tork step headers for this combo. What size tubes are they? Bottom and mid range torque is not going to be an issue. Getting it to make power past 4500 rpm is! You gotta let it breathe.

Exactly which intake?

Try to make everything work at the same RPM range. That cam doesn't compliment a single plane as well, and I know you already have vacuum secondary 750, but I'd look at moving up to a DP and would not be afraid of an 830 or more.

Depending on HP you are planning, but the 2.5" pipes will start to hurt once you get past the 475-500 or so range. 3" would be better and not much noiser depending on muffler you use. In fact, often they are a little quieter.


JIM

 

well the basics of this engine came from the 2002 edition of hot rod magazine's yearly engines... where they have a hardcore racing 427 sb(550tq /500hp/6500redline) with matching heads except they have 220cc runners instead of 215. i guess i have much to learn. the cam was reccomended to me by my mechanic who has built quite a few sb... its
actually more of a torque oriented cam but hey im doin this for the fun factor of roasting the tires on the street for a few blocks :lol: dunno i have no idea what kind of torque it will make just that i want it by the truckload thats why i was curious on someone running it through desktop dyno so i could get an idea... youre probably right i should step up to a lumpier cam and get some more high end out of it. as for the manifold it was just a tentative idea so its still open to whatever sounds best. the exhaust i already have installed also ... its not even a year old and i think id keep it around until my wallet healed from the engine build :lol: at that point( and when my friends stop using my name and :crazy: in the same sentence) ill have cash to work on the exhaust and tires. thanks for the advice ill do some more research on the cam and head combo..please anyone feel free to comment i need some more seasoned advice :smash:


[Modified by couldbefun, 9:30 PM 11/27/2002]


[Modified by couldbefun, 6:07 PM 11/30/2002]

 

Sounds like a powerhouse, but the size of the intake runners & the single plane begs for a bigger cam. At a minimim I would go with at least 225 deg @ .050" lift intake duration & around .510" lift. 1.6 rockers may be better for this motor.

 

Your current cam is way too small, it'll start fading by 5000rpm. You're basically building a big block in an SBC package. I tried 4 cam on the dyno when I built my NA SBC 427. Each time I stepped up in cam sie it made more power and torque at all rpm points. The largest cam, a 256/264 made more low end torque than the smallest cam with low 240 duration. You need more duration than when building a typical small block .

I'd go with a pair of Brodix 18x heads ($2000 and they used 23* valvetrain) or AFR 215RR/220/227cc heads, a roller cam with around 250/256 duration, 112 LSA and closer to .550-.600" lift, or more if you're willing to do some annual maintenance. You'd probably make close to 600hp/575 ft lbs on pump gas with about 10.5 to 11.0 compression and would have pretty good drivability.


[Modified by Monty, 10:50 AM 11/28/2002]

 

Happy Turkey Day! I'll run it thru DD2000 for you. Can you post/IM:

Bore/Stroke (4.185x3.875?????)
Cam Events/CC Part#

I'm pretty new at this program and crappy with computers in general, but be patient and I'll get it for you :cheers:

 

ok so the cam has gotta go... ill look into a lumpier one. ill check into the heads too. thanks everyone for the advice ill have to check this all out
monty, if you read this again can i get the "build sheet" on your 600 hp sb? thanks

 

Actually, a bigger cam won't necessarily be lumpier - the bigger an engine is, the easier it can "swallow" what it is being fed. I have a 406 with a solid roller .572/.576 lift, 242/248 duration, 110 LSA - damn thing idles smooth!

Thomas

 

Hi Eric. I just got the idea to check IM history and found your messages. Weird, the IM box would appear yesterday from time to time, but was only showing your 1st reply.
Anyhow, I've got the info I neeed I think, and I'll play around with it today. :seeya

 

:lol: thanks again Tim. i dont know whats up with the messaging..... over here i get the pop up box but i cant scroll down :confused: i have to go read all the conversations through im history also
thanks again and take your time :chevy

 

Here is a list of cams I have started:


http://temp.corvetteforum.net/c3/69s.../cam_page.html

LPE uses a cam w/ 236/244* duration @ 0.05" lift and w/ 0.549/0.549 valve lift with 1.5 rockers in a 420 cubic inch small block. Ported Airflow 190 heads Superram EFI intake.. 525 HP @ 5500 RPM, 540 lbs-ft @ 4500 RPM. His engines are geared towards streetable torque. Just to give you an idea. IF you want more HIGH RPM power, then you may want more cam.

Crane HR-296 (roller) may be a good choice. be careful of valve float.
234/242 Duration / 0.539/0.558 Lift / 112 Centerline

 

thanks all! im lookin into the cam.... ill go at least a 248 after looking at numerous posts and build sheets. thanks to caboboy for the ddyno work :smash:

 

Eric, 69stingray is right on! This motor he mentions is almost exact to the one on a stand in my garage as we speak. The problem is, no matter what I do with your flat tappet cam and your induction, I can't get you anywhere near your HP/Torque goals on DD2000. I think you've gotta go hydraulic or solid roller to get anywhere near where you gotta be, and your compression ratio is causing some problems too.
I've got to take off tonite, but IM your phone # and I'll call you in the morning Pacific Time (or whenever is best for you) to go over the workups I've done. (My cell phone has toll free calling :D)