Thread: new combo

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this combo will be going in my new project 1977 camaro will also have 4:10 gears an posi rearend. please let me know if ill see the hp an tq numbers

Displacement: 357 cu. in.
Carburetor: Edelbrock 750
Heads: World Products Sportsman II
Intake: Edelbrock Performer RPM
Camshaft: Comp Cams Xtreme Energy 274° hydraulic, with 274/286° of duration, 230/236° of duration @ 0.050 in. lift, and 0.487/0.490 in. lift. (Corrected valve lift with 1.6:1 rockers is 0.519/0.523 in.)
Rockers: Comp Cams Pro Magnum 1.6:1
Pistons: Ross Racing flat tops
Rods: Lunati 4340 steel
Crank: cast
Distributor: GM HEI with an MSD coil
Compression: 9.5:1

MAX HP: 416 @ 5800
MAX Torque: 396 @ 4300

I wouldn't put it together with 1.6 rockers on an Extreme Energy cam. I would on a Magnum cam though, like this one. Part #12-326-4, grind 286H, 286/286, 236/236, 0.522"/0.522", 110* LSA, install 2* advanced. Use 1 3/4" long-tube, equal-length headers. This dynosim is less mufflers....
RPM HP TQ
2000 139 366
2500 194 407
3000 232 406
3500 280 420
4000 327 429
4500 368 429
5000 401 421
5500 423 403
6000 428 375
6500 421 341

Originally Posted by old355

this combo will be going in my new project 1977 camaro will also have 4:10 gears an posi rearend. please let me know if ill see the hp an tq numbers

Displacement: 357 cu. in.
Carburetor: Edelbrock 750
Heads: World Products Sportsman II
Intake: Edelbrock Performer RPM
Camshaft: Comp Cams Xtreme Energy 274° hydraulic, with 274/286° of duration, 230/236° of duration @ 0.050 in. lift, and 0.487/0.490 in. lift. (Corrected valve lift with 1.6:1 rockers is 0.519/0.523 in.)
Rockers: Comp Cams Pro Magnum 1.6:1
Pistons: Ross Racing flat tops
Rods: Lunati 4340 steel
Crank: cast
Distributor: GM HEI with an MSD coil
Compression: 9.5:1

MAX HP: 416 @ 5800
MAX Torque: 396 @ 4300

This is not a bad set up but as above it would make more power with a one point jump in C/R

Any suspension, differential, or chassis mods???? Dang shame to have 400 horse that either breaks parts or won't hook up??????? What transmission, and if an automatic, what converter??????

needs a different intake, holleys trip dominator or vic jr. if you really want 1:6 rockers just buy the bigger cam save some money.

Open manifold loses torque over the RPM.

tech i want 450 horse from a 350 wit out doing a stroker.... i know a roller cam would help me out that why im going wit a 96 block 4 bolt main could give me a nice combo please i want to be around 10:5:1 so i can run 93 octain

OK, Gen I roller block bored 0.040", 357 CID. Decks adjusted for 9.011" block deck height. Keith Black hyper pistons #KB120, 7cc crown, 1.561" compression height, 5/64ths rings. 0.010" piston deck height with 9.011" block deck height. Victor Reinz #5746 Nitroseal Head Gasket, 0.025" X 4.100". 10.30:1 static compression ratio with 64cc heads, 0.035" squish.
http://kb-silvolite.com/performance....tails&P_id=157

Sportsman II heads, 2.02"/1.60", 64cc chambers with CompCams #986 valve springs or equivalent rate springs from another mfg. Seat load 132# @ 1.750". 322#/in rate. 300# over the nose on the exhaust lobe with this cam.

CompCams hydraulic roller, part #08-432-8, grind #XR282HR, 282/288, 230/236, 0.510"/0.520", 110 LSA, installed straight up.
http://www.compcams.com/Cam_Specs/Ca...?csid=189&sb=0

High-rise dual-plane intake manifold with 750 carb, VS or Double Pumper. Edelbrock RPM, RPM Air Gap, Weiand Stealth, Stealth Air Strike, etc.

1 3/4" long-tube, equal-length headers.

RPM HP TQ
2000 137 360
2500 174 367
3000 226 395
3500 289 433
4000 349 459
4500 402 470
5000 444 466
5500 471 450
6000 475 417
6500 455 368

I don't particularly like these heads. If you use enough cam to make the hp, it takes away from torque at the bottom. I like to see 400 ft/lbs @ 2000 rpm's for a good, stout street motor. These heads require 3100 rpm's to make 400 with this particular cam and I couldn't get there with any other cam that I tested on the sim. Went through 8 different cams on this combination before settling on this one. Should be used with a 3000 stall converter though, for best results.

I guess I've been ruined by seeing results using Airflow Research aluminum heads. This same combo with AFR 190 heads makes 522/490. Of course, the AFR's wouldn't make 400 @ 2000 either, not with this cam.

tech thanks alot this car wont be on the track at all so this is a well built set up that will produce number that i wanted at the rpm level that i would be runnin on the express way LOL.... An i know if i choose to go with a different head such as a AFR or Dart my number would increase..... to go on an say if i did have the money to get the AFR i would but the sportsmanII will come to me at a good price an these are the number i really wanted wit out breakin the bank also im going forged bottom end to be able to spin it to 7500would anything change.

Make sure you check the DCR on the cam you choose. If you bump up the compression to 10.5, you will not be able to use the XE 274 cam because the DCR will be over 8.5 and incompatible with pump gas.