Need some opinions!
Thread Starter
Instructor
Joined: Jan 2009
Posts: 193
Likes: 0
From: NJ
Need some opinions!
I am about to order my new parts for my 383 rebuild, and I want to know what other experts think of my part choices?
Scat rotating assembly with forged pistons 11-1 comp ratio, forged rods, and cast crank, internally balanced.
Lunati- retro roller cam Duration @ .050 (Int/Exh): 243/251 Gross Valve Lift (Int/Exh): .560/.565
AFR Eliminator 195's heads-full roller rockers 1.5
Edelbrock RPM air gap manifold
Mighty Demon 750 carb
3000 B&M stall
3.70 gears
Longtube hooker headers with flow masters exhaust w/H pipe
Petronix ignition
I put a lot of time in this build and I think it should run pretty good. I am hoping to be around 550 HP what do you think?
Scat rotating assembly with forged pistons 11-1 comp ratio, forged rods, and cast crank, internally balanced.
Lunati- retro roller cam Duration @ .050 (Int/Exh): 243/251 Gross Valve Lift (Int/Exh): .560/.565
AFR Eliminator 195's heads-full roller rockers 1.5
Edelbrock RPM air gap manifold
Mighty Demon 750 carb
3000 B&M stall
3.70 gears
Longtube hooker headers with flow masters exhaust w/H pipe
Petronix ignition
I put a lot of time in this build and I think it should run pretty good. I am hoping to be around 550 HP what do you think?
Cruising
Joined: Jan 2010
Posts: 13
Likes: 0
From: Kouts Indiana
Well in my opinion with my vette I planned on getting as much horsepower as I possibly could but then I got to thinking about the weight of the car and what I was really going to do with the car. I dont need 500 hp. My 383 has a 10.5:1 and I run high octane pump gas. I'm getting about 400 hp. I have air flow research heads I perfer them better myself and a holley 750 double pumper. And i perfer crane cam as to lunati. But even though the corvette is built for speed they get awfully light in the front end when your really pushin the petal to the metal and as known from observation...consider an airplanes take-off speed...it is VERY dangerous...but life is full of risks i suppose..... Just a thought
Last edited by 79vette383; Jan 28, 2010 at 10:27 PM.
Le Mans Master
Joined: Apr 2007
Posts: 7,353
Likes: 72
From: Graceland in a Not Correctly Restored Stingray
I haven't done the theoretical DCR math on your particular combo, but do keep in mind that even within "acceptable" tolerances (the limit is thought to be ~8.5:1 on premium pump gas) that it's a good practice to hedge your bets with high compression / larger cam combos to allow some margin for max cylinder pressures, especially with good breathing heads.
If idle quality and/or idle vacuum matter at all, have you given any thought to possibly spreading the LSA out a couple of degrees? That 294 Voodoo is a lot of bumpstick for the street.
IMHO (note: not my "IMEO") I'd seriously consider upgrading to a forged crank while your at it.
Anyway, I may be a BB guy, but 383's most definitely rock.
If idle quality and/or idle vacuum matter at all, have you given any thought to possibly spreading the LSA out a couple of degrees? That 294 Voodoo is a lot of bumpstick for the street.
IMHO (note: not my "IMEO") I'd seriously consider upgrading to a forged crank while your at it.
Anyway, I may be a BB guy, but 383's most definitely rock.
Instructor
Joined: Mar 2009
Posts: 209
Likes: 1
From: Denver CO
why a cast crank instead of a forged? budget? I eventually want to build a 383 as well and was going to go with all forged in the hopes of eventually getting some form of boost on the engine!!!
Btw... someone needs to explain some of these acronyms to me... im not a huge forum guy until now because this forum is such an incredible resource!
IMHO? IMEO? SMC? DCR? LSA? and i have seen a few others floating around... dont worry i get SB and BB, but some other things i have come across i have no idea what people are talking about!
Btw... someone needs to explain some of these acronyms to me... im not a huge forum guy until now because this forum is such an incredible resource!
IMHO? IMEO? SMC? DCR? LSA? and i have seen a few others floating around... dont worry i get SB and BB, but some other things i have come across i have no idea what people are talking about!
Last edited by Raider74; Jan 29, 2010 at 06:04 PM.
Race Director
Joined: Dec 1999
Posts: 19,610
Likes: 778
From: Forked River NJ
If you run that cam you should have no problem at 11 to 1 with aluminum heads. I think the cam is a little much for a 383 on the street. I am running a 242/248 @ .050 in a solid roller. I came down from a 252/260 solid flat tappet cam. No detonation problems with the solid flat tappet running pump gas at 10.7 to 1. I went up a little closer to 11 to 1 now with the solid roller and new heads. I went from 68cc to 64cc heads. I'll be on the brink of detonation but I should be OK. The only thing I would do slightly different is a little less cam. I do run all forged internals. It is only a few dollars more and mine does see 7000 rpm often.
Thread Starter
Instructor
Joined: Jan 2009
Posts: 193
Likes: 0
From: NJ
Yeah I think I may end up with a slightly less aggressive cam, as I am concerned it will not be very streetable when I am not driven it hard. I am going cast crank bc of a budget but I may do it all forged in cases down the road I want to spray it with nitrous.
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Le Mans Master
Joined: Apr 2007
Posts: 7,353
Likes: 72
From: Graceland in a Not Correctly Restored Stingray
IMEO = In My Expert Opinion
SMC = Scottish Mountaineering Club?
DCR = Dynamic Compression Ratio (theoretical)
LSA = Lobe Separation Angle
There are still a few others which I haven't caught on to myself, but hope that helps.
Race Director
Joined: May 2005
Posts: 10,674
Likes: 122
From: Millington Illinois
St. Jude Donor '08-'09
I would be glad to contribute if you want to PM me. It seems that I can't post my opinions on here anymore without getting in an arguement with one particular forum member. It is a shame this forum has come to this.
Thread Starter
Instructor
Joined: Jan 2009
Posts: 193
Likes: 0
From: NJ
If you run that cam you should have no problem at 11 to 1 with aluminum heads. I think the cam is a little much for a 383 on the street. I am running a 242/248 @ .050 in a solid roller. I came down from a 252/260 solid flat tappet cam. No detonation problems with the solid flat tappet running pump gas at 10.7 to 1. I went up a little closer to 11 to 1 now with the solid roller and new heads. I went from 68cc to 64cc heads. I'll be on the brink of detonation but I should be OK. The only thing I would do slightly different is a little less cam. I do run all forged internals. It is only a few dollars more and mine does see 7000 rpm often.
