Thoughts on this 383 build?
Thread Starter
Instructor
Joined: Apr 2007
Posts: 177
Likes: 0
From: Collierville TN
Thoughts on this 383 build?
Any thoughts on this build would be appreciated. I've acquired a late model 350 block (roller, 1-piece rear main) that I am going to build up into a 383. Cost is a concern, so all parts must offer best bang-for-buck.
Rotating assembly: Scat kit with cast crank, forged 6" rods with 7/16" ARP fasteners, forged Probe flat-top pistons
Cam: Comp 08-422-8 or Lunati 60112 (Desktop Dyno shows these two cams to be very similar, but I am not sure...)
Heads: Leaning towards Brodix IK210s (2.080 intake port, big flow, but my concern is going too large and killing the low end)
Intake: My existing Weiand 8004
Carb: 750cfm Q-Jet
DD estimates 500 ft-lbs @ 4500 rpm and 483hp @ 5500 rpm.
This will be mated to a TH400, probably with a ~2500 rpm torque converter. I have 3.08 gears but plan to go to ~3.55 sometime in the future (probably a project for next winter).
The engine is for street use only, and I don't care to wind it much over 5500 to 6000 rpm. I need something more visceral than the L48, though...
Anything you would do differently? Why? All advice is appreciated!
Rotating assembly: Scat kit with cast crank, forged 6" rods with 7/16" ARP fasteners, forged Probe flat-top pistons
Cam: Comp 08-422-8 or Lunati 60112 (Desktop Dyno shows these two cams to be very similar, but I am not sure...)
Heads: Leaning towards Brodix IK210s (2.080 intake port, big flow, but my concern is going too large and killing the low end)
Intake: My existing Weiand 8004
Carb: 750cfm Q-Jet
DD estimates 500 ft-lbs @ 4500 rpm and 483hp @ 5500 rpm.
This will be mated to a TH400, probably with a ~2500 rpm torque converter. I have 3.08 gears but plan to go to ~3.55 sometime in the future (probably a project for next winter).
The engine is for street use only, and I don't care to wind it much over 5500 to 6000 rpm. I need something more visceral than the L48, though...
Anything you would do differently? Why? All advice is appreciated!
Race Director
Joined: Dec 1999
Posts: 19,610
Likes: 778
From: Forked River NJ
Not a bad build up but the HP and torque estimates are high for that motor with that cam. Should produce good torque down low with that combo. I would step up to a cam in the high 220 @ .050 range. Remember the cams are rated for a 350. A bigger motor will require more duration.
Thread Starter
Instructor
Joined: Apr 2007
Posts: 177
Likes: 0
From: Collierville TN
Not a bad build up but the HP and torque estimates are high for that motor with that cam. Should produce good torque down low with that combo. I would step up to a cam in the high 220 @ .050 range. Remember the cams are rated for a 350. A bigger motor will require more duration.
Cam selection is definitely the most frustrating part of this process...
Race Director
Joined: Dec 1999
Posts: 19,610
Likes: 778
From: Forked River NJ
I like that one better. Even after you decide and it is in the car and running you will think, what if I run this cam or that cam.
Le Mans Master
Joined: Apr 2005
Posts: 6,359
Likes: 428
From: Seattle Area WA
I think the IK210s have been discussed before as having too large of an intake port to match a conventional manifold. Brodix wants you to buy one of their intakes.
The IK180s are rated for a mild 383 build. You don't mention a compression ratio target and I assume you have headers and a good exhaust system.
The IK180s are rated for a mild 383 build. You don't mention a compression ratio target and I assume you have headers and a good exhaust system.
Thread Starter
Instructor
Joined: Apr 2007
Posts: 177
Likes: 0
From: Collierville TN
I think the IK210s have been discussed before as having too large of an intake port to match a conventional manifold. Brodix wants you to buy one of their intakes.
The IK180s are rated for a mild 383 build. You don't mention a compression ratio target and I assume you have headers and a good exhaust system.
The IK180s are rated for a mild 383 build. You don't mention a compression ratio target and I assume you have headers and a good exhaust system.
Compression ratio will be approximately 10.5:1, and I will be adding headers and 2.5" exhaust with Magnaflows. I am considering the kit from Corvette America.
Burning Brakes
Joined: Dec 2003
Posts: 1,004
Likes: 7
From: Adelaide South Australia
112 lsa gives very good torque spread on my 242/240 @ 0.050 hydraulic roller. 383 cubes gives plenty of grunt down low, and if you run a good stall converter with 3.55 diff gears, you'll need to keep a toothbrush in the car to get the bugs out of your grinning smile 
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Le Mans Master
Joined: Sep 2001
Posts: 7,739
Likes: 630
From: Unreconstructed, South Carolina
Y'all need to check this because I'm doing this from memory only ...
I think the IK210 is a different animal ... it's alot lot more $ than either IK180 or IK200 ... I think it's cnc'd ... I think IK210 actually has a smaller intake PORT GASKET dimension than IK200 ... I know counterintuitive but I think so ... check it.
seems IK200 makes big flow numbers from a huge port volume alone ... seems IK210 makes good flow numbers from a different port shape/valve size & not just volume.
Most intakes that PROPERLY fit big-gasket (?fp1206) IK200 may not fit under C3 hood ... seems IK180 & IK210 have a few more options. Off top of my head ... y'all check it.
-edit-I checked, gasket apps verified from brodix site:
• Intake Gaskets:
FEL-PRO 1204, COMETIC C5416 (IK 180)
FEL-PRO 1206, COMETIC C5414 (IK 200)
FEL-PRO 1205 (KC IK 210)
I think the IK210 is a different animal ... it's alot lot more $ than either IK180 or IK200 ... I think it's cnc'd ... I think IK210 actually has a smaller intake PORT GASKET dimension than IK200 ... I know counterintuitive but I think so ... check it.
seems IK200 makes big flow numbers from a huge port volume alone ... seems IK210 makes good flow numbers from a different port shape/valve size & not just volume.
Most intakes that PROPERLY fit big-gasket (?fp1206) IK200 may not fit under C3 hood ... seems IK180 & IK210 have a few more options. Off top of my head ... y'all check it.
-edit-I checked, gasket apps verified from brodix site:
• Intake Gaskets:
FEL-PRO 1204, COMETIC C5416 (IK 180)
FEL-PRO 1206, COMETIC C5414 (IK 200)
FEL-PRO 1205 (KC IK 210)
Last edited by jackson; Feb 11, 2008 at 09:43 AM.
