383 Build, Input please
Thread Starter
12 Second Club
iTrader: (15)
Joined: Mar 2007
Posts: 1,928
Likes: 0
From: Cheyenne, Wy
383 Build, Input please Ok, forget my past, I AM NOT the one doing the work on this engine, so please leave that out.
I have a STOCK LT1 short block. Stock bore, stock internals, unknown miles.
I want to build a 383 that is all set up properly and dont want to just got buy a cheap kit. I want it done right, everything flowing right, etc.
My ONLY limitations are this:
I want to retain the current heads (AFR Heads modified by TPiS, 54cc Chamber, 2.02 Int/1.66 Exh. Manley Valves, 187cc)
I want to retain my stock intake manifold however it has been port matched to both the heads and throttle body.
Details on the car:
I am going to upgrade the rear-end to a Moser before I install this kit and don't know the gears, so recommendations would be great.
It is a 6-speed, stock tranny
What I wanna do is build a 383 from that block and build it to flow right. This means I need all the internals, camshaft, timing chain, lifters, pushrods, rockers, clutch, rear-end gears.
Here are some upgrades I already have, do I need to further upgrade any of these items?
30# SVO Injectors
52mm Throttle Body
MSD 6AL Ignition Control
MSD Heavy Duty Coil
MSD 8.5mm SP Wires
LS7 Lifters
.600 lift springs
Also anything else you can think of for tips, or advice, or whatever REGARDING A 383 SETUP would be appreciated!
I am not going to a larger block, or higher than a 383, so please keep it on topic! Money is not an issue here, I want it to flow right!
I know people ask this alot, but I would prefer a custom setup than a generalized one...Thanks all!
I have a STOCK LT1 short block. Stock bore, stock internals, unknown miles.
I want to build a 383 that is all set up properly and dont want to just got buy a cheap kit. I want it done right, everything flowing right, etc.
My ONLY limitations are this:
I want to retain the current heads (AFR Heads modified by TPiS, 54cc Chamber, 2.02 Int/1.66 Exh. Manley Valves, 187cc)
I want to retain my stock intake manifold however it has been port matched to both the heads and throttle body.
Details on the car:
I am going to upgrade the rear-end to a Moser before I install this kit and don't know the gears, so recommendations would be great.
It is a 6-speed, stock tranny
What I wanna do is build a 383 from that block and build it to flow right. This means I need all the internals, camshaft, timing chain, lifters, pushrods, rockers, clutch, rear-end gears.
Here are some upgrades I already have, do I need to further upgrade any of these items?
30# SVO Injectors
52mm Throttle Body
MSD 6AL Ignition Control
MSD Heavy Duty Coil
MSD 8.5mm SP Wires
LS7 Lifters
.600 lift springs
Also anything else you can think of for tips, or advice, or whatever REGARDING A 383 SETUP would be appreciated!
I am not going to a larger block, or higher than a 383, so please keep it on topic! Money is not an issue here, I want it to flow right!
I know people ask this alot, but I would prefer a custom setup than a generalized one...Thanks all!
Agreed. Op you should part out everything you have now and start over, letting a reputable shop spec you a heads/ cam package. Ai or Le will get you there. This is if you want to do it "right".
Putting that topend on a stroker would be retarded.
It would likely run no better than the steaming pile between your fender wells at present.
33 additional cubic inches doesnt magically give you a bajillion hp. The topend is what makes the power. If you dont spend the money in the topend and valvetrain to properly feed a stroker and you will get worked by stock stroke motors and give LT1's a bad name like everyone else who builds a 383 and slaps a bunch of cheap *** random parts together and expects it to set records.
It would likely run no better than the steaming pile between your fender wells at present.
33 additional cubic inches doesnt magically give you a bajillion hp. The topend is what makes the power. If you dont spend the money in the topend and valvetrain to properly feed a stroker and you will get worked by stock stroke motors and give LT1's a bad name like everyone else who builds a 383 and slaps a bunch of cheap *** random parts together and expects it to set records.
i agree with the other guys... those heads are gonna choke out that motor... if they are only 187cc and you are set on keeping stock casted heads... they still have plenty of room left for porting 1997 heads arent the greatest for porting ( i know becuas ei have one) i went with cnced trick flows (200cc) and will have stock intake ported to match... im going to be running compstar rotaticing kit with srp pistons... this stuff isnt cheap... ill have about 10K give or take from pan to intake when its complete inlcluding all machine assembly and blueprint work.... im not confident enough to do this stuff my self as it sounds like you arent either... go with a bigger head and 58mm throttlebody... port the intake more... ls7 lifters should be good my cam is a decent size for a street/strip car and im not even making it to .600 lift so u might be good with those valves/springs too depending on the spring rate... youll probably be pretty cool with the ignition stuff but will need larger injectors and that will depend on what your setup ends up being... if you are going to beat on it and race it you should go forged internals and think about 4 bolt or splayed mains... hope this help ya out...
Trending Topics
I might be wrong but isn't the main reason people stroke an LT1 so they can run larger head/cam and still keep the car streetable or atleast keep in under the 7k rpm limit. Also if your gona spend the money to go with a stroker why not go with larger heads so you can use those cubic inches. If you do end up building a 383 go forged or nothing. Aftermarket cast cranks are well special (not in the good way). If you have any more direct questions I'd be happy to help I just dont want to see another low powered stroker lt1 get spanked by a bolt-on ls1.
LS1 Tech Stories
The Best V8 Stories One Small Block at Time
6 Common C5 Corvette Failures and What's Involved In Repairing Them
Pouria Savadkouei
Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph
Verdad Gallardo
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked
Pouria Savadkouei
Top 10 Most Powerful Chevy Trucks Ever Made!
Hennessey's New Supercharged Silverado ZR2 Has 700 HP
Verdad Gallardo
Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes
Verdad Gallardo
Awesome K5 Blazer Restomod Comes With C7 Corvette Power
Verdad Gallardo
10 Camaros You Should Never Buy
10 LS Engine Myths That Refuse to Die
Verdad Gallardo
The guy I bought my LT1 aluminum cores from was selling them because he went with the 187cc TPIS ported AFR. My heads/cam Caprice is faster then his 383 Camaro. He would like his old heads back.
He has tried them with at least three different TPIS cams on both a stock shortblock and the 383.
On the stock shortblock with the TPIS 212intake cam they ran the same 13.2 that my Caprice did cam only and mine was the little ZZ4 cam 208/.474 intake, with 2800 stall and 3.42s, REALLY mild setup, passengers would mistake the car for stock till I stepped on the loud pedal.
He has tried them with at least three different TPIS cams on both a stock shortblock and the 383.
On the stock shortblock with the TPIS 212intake cam they ran the same 13.2 that my Caprice did cam only and mine was the little ZZ4 cam 208/.474 intake, with 2800 stall and 3.42s, REALLY mild setup, passengers would mistake the car for stock till I stepped on the loud pedal.
Thread Starter
12 Second Club
iTrader: (15)
Joined: Mar 2007
Posts: 1,928
Likes: 0
From: Cheyenne, Wy
Ok, that is what I needed to hear. I have to cash to either fix the 355 I have now, or do what I said in the first post, but if I do a 383 I cant afford new heads due to what I will be spending on the stuff for a 383.
If this is the case I will just stick with the 355 and make it run right. Thanks guys.
If this is the case I will just stick with the 355 and make it run right. Thanks guys.
I thought "Money is no issue here"?
I think your making the right choice in sticking with what you have and getting it to run.
I would spend the money you would have put towards the 383 rotating assy and ditch those heads.
I think your making the right choice in sticking with what you have and getting it to run.
I would spend the money you would have put towards the 383 rotating assy and ditch those heads.
I'm building a new 383 for my car and I have an all forged rotating assembly from Competition Products and I had my local machine shop race prep the block with splayed billet caps and ARP head & main studs. I already had a 847 cam and Caddy Racing lifters, Manley 2.055/1.6 stainless raceflow valves and a set of new bare 643 casting heads, so I sent the heads and valves to Lloyd Elliott for his LE3 porting and it was about $1400.
Since you already have the AFR heads why not get the 383 rotating assembly then send your heads to LLoyd or Ai for additional porting and get a matching cam. I don't know why everyone here is telling you your heads are junk, they just need more work.
Since you already have the AFR heads why not get the 383 rotating assembly then send your heads to LLoyd or Ai for additional porting and get a matching cam. I don't know why everyone here is telling you your heads are junk, they just need more work.
No one has addressed this question. Most M6s go with a gear around a 4.10 ratio. Stock is 3.42, so you will notice a SOTP difference.
AFA the heads are concerned, I STRONGLY recommend that you call some competent head builders. They do it for a living, and can give you proper guidance. You may know some; you might be able to get good advice from Elliot. I know an independent, if you PM me I can give you his web site/number. I don't want to get involved in the good/bad issue, I don't know enough about the issue. But I do know enough not to just toss them out like yesterday's garbage w/o consulting an expert.
