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Old 04-28-2013, 11:26 AM
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Need advice on 383 G-body build

Hey guys I just started a new build and need some advice on my combo. This is a 383 chevy that is being built with the goal of 450hp/400+tq at the crank. This is a street car that will not see much track time but still want it to pull hard to 6000rpm.
Sorry for the long post but so far this is what i have.

Machined factory 2 bolt roller block (w/main studs)
Scat 9000 crank (did not see a need for a 4340)
probe flat tops
Scat I beams
Comp HE roller rockers 1.6
OE roller setup
Isky 272/282 hydraulic roller .505/.530 (approx .538/.565 w/ 1.6 rocker)
Profiler 195cc heads 72cc chamber
Performer RPM intake
750 eddy carb
TH-400 trans and 3.73 gears
Should be right at 10.27 to 1 static and 8 to 1 dyanmic.
(93 octane at the pump here.)

Do you guys think this will get me where i want to be. Any feedback would be appreciated. Thanks
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Old 04-28-2013, 02:53 PM
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Quote:
Originally Posted by Raptorus1 View Post
Hey guys I just started a new build and need some advice on my combo. This is a 383 chevy that is being built with the goal of 450hp/400+tq at the crank. This is a street car that will not see much track time but still want it to pull hard to 6000rpm.
Sorry for the long post but so far this is what i have.

Machined factory 2 bolt roller block (w/main studs)
Scat 9000 crank (did not see a need for a 4340)
probe flat tops
Scat I beams
Comp HE roller rockers 1.6
OE roller setup
Isky 272/282 hydraulic roller .505/.530 (approx .538/.565 w/ 1.6 rocker)
Profiler 195cc heads 72cc chamber
Performer RPM intake
750 eddy carb
TH-400 trans and 3.73 gears
Should be right at 10.27 to 1 static and 8 to 1 dyanmic.
(93 octane at the pump here.)

Do you guys think this will get me where i want to be. Any feedback would be appreciated. Thanks


I would GUESS you have your numbers backwards and its more like
400/425hp-450/465 torque. I don't know much about the heads though.
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Old 04-28-2013, 03:00 PM
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Quote:
Originally Posted by Raptorus1 View Post
Hey guys I just started a new build and need some advice on my combo. This is a 383 chevy that is being built with the goal of 450hp/400+tq at the crank. This is a street car that will not see much track time but still want it to pull hard to 6000rpm.
Sorry for the long post but so far this is what i have.

Machined factory 2 bolt roller block (w/main studs)
Scat 9000 crank (did not see a need for a 4340)
probe flat tops
Scat I beams
Comp HE roller rockers 1.6
OE roller setup
Isky 272/282 hydraulic roller .505/.530 (approx .538/.565 w/ 1.6 rocker)
Profiler 195cc heads 72cc chamber
Performer RPM intake
750 eddy carb
TH-400 trans and 3.73 gears
Should be right at 10.27 to 1 static and 8 to 1 dyanmic.
(93 octane at the pump here.)

Do you guys think this will get me where i want to be. Any feedback would be appreciated. Thanks
I'm not a fan of ede carbs, would like to use a 750DP but your goals seem bang on. Love those heads. I have em too......
3500 converter, 275DR and hold the ** on lol.

Last edited by 68NovaSS; 04-28-2013 at 08:26 PM. Reason: Overriding the censorship system
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Old 04-28-2013, 04:11 PM
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Quote:
Originally Posted by 0trbo4myCHEVUICK View Post
I would GUESS you have your numbers backwards and its more like
400/425hp-450/465 torque. I don't know much about the heads though.
Oops totally backwards
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Old 04-28-2013, 04:19 PM
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Quote:
Originally Posted by bygddy View Post
I'm not a fan of ede carbs, would like to use a 750DP but your goals seem bang on. Love those heads. I have em too......
3500 converter, 275DR and hold the ** on lol.

Yeah i didnt know much about the profilers until a friend of mine replaced his IE 180s with these and it made a believer out me. I agree on the edelbrock carb and i do have a DP holley but this just my cruiser and dont need all out power just set it and leave it alone ya know.

Last edited by 68NovaSS; 04-28-2013 at 08:21 PM.
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Old 04-28-2013, 04:19 PM
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Thanks for the feedback guys!
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Old 04-28-2013, 04:39 PM
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Originally Posted by Raptorus1 View Post
Yeah i didnt know much about the profilers until a friend of mine replaced his IE 180s with these and it made a believer out me. I agree on the edelbrock carb and i do have a DP holley but this just my cruiser and dont need all out power just set it and leave it alone ya know.
Gonna be one hell of a cruiser
I have only the seat of my very large pants to go by, but in my case, for a 355 with a wee little cam in it it pulls really really well. I have to chalk that up to the heads for sure.
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Old 04-28-2013, 05:02 PM
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post a video when shes running.Sounds like it is on track with those parts
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Old 04-28-2013, 06:51 PM
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Very nice choice of parts. I like the combo a lot for your goals.

First thing I thought when I read your post was that you had the HP/TQ numbers backwards, as has already been mentioned.
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Old 04-28-2013, 10:34 PM
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[QUOTE=vinniekq2;1670946]post a video when shes running.Sounds like it is on track with those parts[/QUOTE

will do soon as she is running
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Old 04-29-2013, 12:29 AM
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Assuming a 9cc gasket and zero piston deck height, I get 10.22:1 SCR

When you guys do this stuff, try to show us all the tech data that's available, like the gasket displacement, piston deck height displacement and some info about the cam that we can use to make sense out of the whole mess.......please........I had to hunt up the timing card......
Isky Timing Chart

I like this cam better....
Isky Timing Chart
With 1.6 rockers, the valve lift is 0.565"/0.587"

The flow numbers I found for the heads used a 4.155" intake pipe and that pysses me off a little bit. All of us know that a larger pipe will result in higher numbers, but if you're bolting the heads onto a 4.030" bore block, then the numbers are bogus. I factored their numbers by 0.95 and here are the results.....
0.200...135...95
0.300...194...136
0.400...237...166
0.500...267...184
0.600...270...194
0.700...273...202

RPM.....HP.....TQ
2000...145....380
2500...184....387
3000...235....411
3500...299....449
4000...362....475
4500...420....490
5000...469....493
5500...491....469
6000...505....442
6500...483....390

Peak volumetric efficiency 99.7% @5000 rpm's
Peak BMEP 194.1 lbs @5000 rpm's

Give up 25 hp with the shorter cam.

Last edited by techinspector1; 04-29-2013 at 12:37 AM.
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Old 04-29-2013, 06:09 AM
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Quote:
Originally Posted by techinspector1 View Post
Assuming a 9cc gasket and zero piston deck height, I get 10.22:1 SCR

When you guys do this stuff, try to show us all the tech data that's available, like the gasket displacement, piston deck height displacement and some info about the cam that we can use to make sense out of the whole mess.......please........I had to hunt up the timing card......
Isky Timing Chart

I like this cam better....
Isky Timing Chart
With 1.6 rockers, the valve lift is 0.565"/0.587"

The flow numbers I found for the heads used a 4.155" intake pipe and that pysses me off a little bit. All of us know that a larger pipe will result in higher numbers, but if you're bolting the heads onto a 4.030" bore block, then the numbers are bogus. I factored their numbers by 0.95 and here are the results.....
0.200...135...95
0.300...194...136
0.400...237...166
0.500...267...184
0.600...270...194
0.700...273...202

RPM.....HP.....TQ
2000...145....380
2500...184....387
3000...235....411
3500...299....449
4000...362....475
4500...420....490
5000...469....493
5500...491....469
6000...505....442
6500...483....390

Peak volumetric efficiency 99.7% @5000 rpm's
Peak BMEP 194.1 lbs @5000 rpm's

Give up 25 hp with the shorter cam.
That cam was actually my first choice but since I am using the factory roller lifter setup my concern with exceeding .354 lobe lift was pushing the lifter below the dogbone. Am I wrong in that line of thinking? If I can get away with the bigger cam I certainly would.
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Old 04-29-2013, 06:21 AM
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Raptorus1, you will be just fine with your build. It will run strong. Get rid of the Edel. carb and go with a 750dp holley, learn to do a quick roll into the throttle.
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Old 04-29-2013, 06:33 AM
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Now that I think about it some more, I have done a few builds very close to yours and ran the Victor Jr and the Holley 3310 780 vac secondary. Also ran a shaft system for positive valve control. 3000stall, a little more off idle transition tuning and the thing ran real strong for what it was. Not too bad with street manners either. Was too much fun!!!
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Old 04-29-2013, 07:19 AM
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Still remembering what I did to that engine. Extended the runners of that Vic Jr manifold out into the plenum kind of like the Wilson manifolds have into the plenum. That woke up the bottom end pretty good! Hooker super comp headers 1.75, 2.5 exhaust through turbo style muffs 2.5 outlet. Also ran MSD dist. and a 6al with a hot coil. 20 initial 38 @ 3000rpm total. 31 shooter, 74 frt jet, 80 rear jet, 6.5 pv frt and rear did open up the IFR .002 . Needed a good starter (Tilton at the time) big battery to turn over hot and ran the best pump gas I could find.
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