grumpyvette Posted May 18, 2007 Share Posted May 18, 2007 I ran accrossed this on a differant site,FROM GBAK,thought it might intersest some of you gentelmen http://s61.photobucket.com/albums/h64/malarn59/Video/?action=view¤t=GBAK.flv whats in it??(its a 383) "Block: 010 , +.060", decked to 9.015" Heads: Trick Flow 64cc/195 cc #TFS-30400003-CNC Headgasket: Mr Gasket 0.028 (quench dist 0.043") #MRG-1134 Pistons: Probe SRS 11.3 comp, forged for 6" rod, #12337-060 Rings: Perfect Circle plasma/moly #315-0033.065 Rods: Manley streetmaster 6" forged (weight matched to pistons) Crank: Eagle ESP cast int balanced (rebalanced) #103503750I Camshaft: CC Advertised Duration 280/ 286, Lift .570/ .576 #CCA-12-771-8 http://www.compcams.com/Technical/Search/CamDetails.asp?PartNumber=12-771-8 Manifold: Performance Products Typhoon (same as RPM, but will fit under my hood, matchported) #52020 Carb: Holley 650 dp with milled choke horn, #HLY-0-4777C Lifters: CC Super roller #CCA-818-16 Roller rockers: Crane #CRN-11745-16 Push rods: CC Hi-Tech length 7.700" #CCA-7963-15 Timing kit: Cloyes Hex-A-Just #CLO-9-3100A And a looooot of work....... Most of the # are from Summit. Have I forgot something.........? No dyno no / ET's. Just calculed the hp/torque with Desktop Dyno.(500hp/550 tq) I will take it to the track later this summer. ET will not be to good, as I don't have the grip, just spinning and spinning and...... " I can tell you that a CROWER 00471 would probably produce MORE mid and lower RPM tq but give up a few peak hp Quote Link to comment Share on other sites More sharing options...
steal my nametag Posted May 18, 2007 Share Posted May 18, 2007 that's fantastic, another great contribution grumpy. brake prop valves can be alotta fun eh! Quote Link to comment Share on other sites More sharing options...
Dat260 Posted May 18, 2007 Share Posted May 18, 2007 Hi Grumpy, The specs your giving above are they from the red vette in the video? Cheers, Quote Link to comment Share on other sites More sharing options...
grumpyvette Posted May 18, 2007 Author Share Posted May 18, 2007 "The specs your giving above are they from the red vette in the video? " Im not doing a thing but posting a QUOTE thats the specs the owner of that red corvette states are what went into the engine build. Quote Link to comment Share on other sites More sharing options...
Dat260 Posted May 18, 2007 Share Posted May 18, 2007 Thanks, I love the sound of that vette. Those are my favorite years for the vette 69/73. Quote Link to comment Share on other sites More sharing options...
Kevin Shasteen Posted May 28, 2007 Share Posted May 28, 2007 Who are you calling gentlemen? Quote Link to comment Share on other sites More sharing options...
grumpyvette Posted June 5, 2007 Author Share Posted June 5, 2007 heres a differant build, notice the differances ,and how the lower cpr hurts, even thou hes got slightly better flowing heads but a milder cam "here is my 383 with specs.... ENGINE -383 stroker 442hp/470ft lbs of torque ) -Chevy 350 bored 30 over and stroked to 383ci -Scat crank 3.75 Stroke Cast 9000 series -Scat 5.7 forged I beam rods with 7/16 arp cap screws -Forged Flat top Probe Sportsman Race Series Pistons -Comp Cams Roller Cam Duration-Intake 230deg Exhaust 236deg @ .050 / Lift Int .510 Exh .520 and 110 lobe separation -Air Flow Research 195cc Heads 74cc chambers -9.7:1 compression -Headman Block Hugger Headers -Edelbrock Fuel Pump -Speed Demon 750cfm Carb Vacume secondaries -Polished Air gap Intake -Edelbrock aluminium water pump -MSD Plug Wires -All Bolts Are ARP -Mini Starter -Edelbrock double roller timing set -Comp cams roller lifters -Crane cams roller rockers -Full Mandrel bent Flowmaster American Thunder exhaust With 50 series deltaflow mufflers and dyno sheet... Intake cener line 105 1/2 jets 76 front 85 rear vac sec spring short yellow timing 35 deg RPM----HP----TQ----A/F--- Vol Eff% 3900 - 328 - 442 - 13.3 - 97 4000 - 340 - 447 - 14.0 - 97 4100 - 356 - 456 - 14.2 - 97.3 4200 - 370 - 462 - 14.0 - 97.5 4300 - 381 - 465 - 13.9 - 97.5 4400 - 390 - 465 - 13.9 - 97.4 4500 - 397 - 463 - 13.8 - 97.4 4600 - 404 - 461 - 13.7 - 97.2 4700 - 410 - 458 - 13.8 - 97.1 4800 - 416 - 465 - 13.8 - 96.9 4900 - 422 - 452 - 13.8 - 96.7 5000 - 427 - 448 - 13.8 - 96.3 5100 - 430 - 443 - 13.8 - 95.8 5200 - 433 - 437 - 13.9 - 95.2 5300 - 435 - 431 - 13.9 - 94.9 5400 - 436 - 424 - 13.8 - 94.6 5500 - 437 - 418 - 13.9 - 94.3 5600 - 439 - 411 - 14.0 - 94.0 5700 - 440 - 406 - 13.9 - 93.5 5800 - 442 - 400 - 13.9 - 92.8 5900 - 442 - 393 - 14.0 - 92.1 6000 - 440 - 385 - 14.0 - 91.5" Quote Link to comment Share on other sites More sharing options...
grumpyvette Posted June 10, 2007 Author Share Posted June 10, 2007 For those who do not receive HotRod magazine, here is a summary of an interesting article about tweaking GM's HT383 crate motor. Some of this may be useful reference material for forum members who are trying to decide on their upcoming engine combinations. Advertised specs: 325 hp @ 4,500 415 lb-ft @ 3,500 "medium-rise GM dual-plane intake with EGR provisions" Vortec heads 4-bolt mains Hypereutectic pistons (9.1:1 compression) Hydraulic roller cam. 196/207 duration @ .050 with .431/.451 lift. Forged crank w/ 3.800" stroke. Std 4.00" bore. Step 1 Initial Combination tested 338 hp @ 4,400 & 444 lb-ft @ 3,400 Headman Tork-Step Headers Petronix Flame-Thrower HEI Speed Demon Carb (625 cfm Road Demon) w/ jets at 70/76 Timing set to 34 degrees Step 2 1.6:1 Roller Rockers 355 hp @ 4,700 & 452 lb-ft @ 3,500 Adding a set of Comp Cams Pro magnum 1.6:1 rollers gained 17 hp and 8.2 lb-ft at peak and didn't lose power anywhere in the curve. Step 3 RPM Air Gap Intake 370 hp @ 4,600 & 466 lb-ft @ 3,700 Gained 15 hp and 14 lb-ft. Step 4 Demon 750 Carb 379 hp @ 4,600 & 474 lb-ft @ 3,700 81/88 jetting. Gained 9.4 hp and 7.7 lb-ft. Step 5 Bigger Cam and thinner head gaskets 455 hp @ 5,600 & 493 lb-ft @ 4,200 Comp Cams XE282HR 230/236 duration @ .050 and .510/.520 (.544/,555 w/ 1.6:1 rockers) w/ 110 lobe separation angle. (The Vortec heads required valve guide modification for this swap due to lift) Swapping to thinner steel shim head gaskets bumped the compression ratio to 9.6:1. The larger cam gave up as much as 25 lb-ft of torque at every data point below 3,600 rpm. Also it formerly idled at 650 rpm and 19 inches of vacuum the new cam idled at 950 rpm and 12 inches of vacuum Gained 76 hp and 19 lb-ft. Step 6 Slippery Oil 463 hp @ 5,600 & 502 lb-ft @ 4,200 Changed from 10W30 dinosaur oil to Royal Purple's 5W30 street oil. Gained 7 hp and 10 lb-ft. They were so impressed with this oil that they're planning a full chassis-dyno test of Royal Purple products for the engine, trans, rearend, and wheel bearings. (you might want to be reminded that 9.6:1 cpr they were forced to work with if far from ideal and that cam is not a good match, to that low cpr, youll need to run about 10.5:1 cpr and change the rear gearing and stall speed to take advantage of the cams characteristics and basic rpm band....you can,t expect to get ideal results if all the components dont run in the intended rpm and cpr they were designed for) Quote Link to comment Share on other sites More sharing options...
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