comments on this 383 combo - The 1947 - Present Chevrolet & GMC Truck Message Board Network

DMAN · 08-11-2003, 05:22 PM

I ran across this combo while doing a search on the internet.It was printed in Chevy High Performance,August 1996.

350c.i., .030 over

Scat cast steel,3.75" crank

Badger flat top pistons, 9.5 comp.

DRS 5.7" rods

World products Sportsman II heads, 200c.c.

Comp. Cams hydraulic cam, 211/221 @ .050, .442/.465 lift,112deg lobe sep.,Comp Cam Magnum rocker arms.

Edelbrock Performer RPM intake, BG prepared Holley carb.

RPM TQ HP

2600 482 279

2800 503 307

3000 498 315

3200 493 309

3400 488 316

3600 485 331

3800 481 348

4000 484 366

4200 477 382

4400 470 390

4600 458 402

4800 444 405

5000 430 410

5200 413 409

5400 393 404

5600 374 400

Given the info above, do you think these numbers are reasonable?
I'm wondering if these heads are a little big for this cam?
Any comments from the stroker gurus would be appreciated.

410 503

bigjimzlll · 08-11-2003, 05:33 PM

sounds about right..maybe a little optimistic...but probably the right curve. 200cc's work perfect with even a mild 383...they make enuff low end torque to make up for the little that might be loss do to the larger intake runners

DMAN · 08-11-2003, 07:08 PM

I wonder what the idle quality and vacuum would be like? You think G.M. Fast Burn heads would be a better choice?

bigjimzlll · 08-11-2003, 07:14 PM

it will sound almost stock with that cam...trick flow twisted wedge...afr..pro1s..protoplines...anyone would be a good choice in an aluminum head

DMAN · 08-11-2003, 08:30 PM

I'm more interested in having a lot of low end torque, could I retain those numbers with a set of iron heads or would I have to lower the compression to 9.0:1 and lose some power? Thanks.

bigjimzlll · 08-11-2003, 08:35 PM

as long as you keep the proper quench of between .035-.045 and use an iron head with an effiecient chamber design 9.5-1 is not out of the question...maybe in the summer.. jump up to 89 octain

crazy longhorn · 08-11-2003, 08:48 PM

my guess is that the tork# are a little optimistic.....hp probably about right with the 200 cc runners. the cam is pretty mild, & should idle darn near smooth in a 383. At 9.5 to 1 on pump fuel, I think I would be tempted to go a little bigger on the cam.......it wont hurt the bottom end on the 383 too much to be in the 220-224 dur range @ .050 on the intake side, & about 230 on the exhaust side. A lot depends on gearing tho.... My 383 could use a little more cam (Comp XE 268, .477/.480, 224/230 @ .050). The edelbrock heads are 170 cc runners, & the thing is torkey as he!!........but i have a lot of gears

crazyL

rin68 · 08-11-2003, 11:14 PM

sounds a lot like my combo, cept for the heads. i have a hard time beleiveing magazine power/torque numbers, especially if they're off that magic dyno out in california. with that cam the engine would idle smooth, my 383 is running 222/230 @050 and it purrs like a kitten; gobs and gobs of low end torque, details of the engine are below

DMAN · 08-12-2003, 12:22 AM

So if my goal is maximum low end torque with a smooth idle,would I be better off with a little bigger cam and heads in the 180cc-190cc range or stay with the 200cc? I'm running 3.73 gears in the rear and plan on swapping in a 700R4 when I replace my engine. Thanks.

08-11-2003, 05:22 PM	#1
DMAN Registered User Join Date: May 2002 Location: Benicia,Ca. Posts: 128	comments on this 383 combo I ran across this combo while doing a search on the internet.It was printed in Chevy High Performance,August 1996. 350c.i., .030 over Scat cast steel,3.75" crank Badger flat top pistons, 9.5 comp. DRS 5.7" rods World products Sportsman II heads, 200c.c. Comp. Cams hydraulic cam, 211/221 @ .050, .442/.465 lift,112deg lobe sep.,Comp Cam Magnum rocker arms. Edelbrock Performer RPM intake, BG prepared Holley carb. RPM TQ HP 2600 482 279 2800 503 307 3000 498 315 3200 493 309 3400 488 316 3600 485 331 3800 481 348 4000 484 366 4200 477 382 4400 470 390 4600 458 402 4800 444 405 5000 430 410 5200 413 409 5400 393 404 5600 374 400 Given the info above, do you think these numbers are reasonable? I'm wondering if these heads are a little big for this cam? Any comments from the stroker gurus would be appreciated. 410 503 __________________ '71 Custom Deluxe K10, shortbed, fleetside.

08-11-2003, 05:33 PM	#2
bigjimzlll Senior Member Join Date: Dec 2001 Location: Redding,CA...USA Posts: 4,736	sounds about right..maybe a little optimistic...but probably the right curve. 200cc's work perfect with even a mild 383...they make enuff low end torque to make up for the little that might be loss do to the larger intake runners __________________ It's called "drag racing" if they called it "tic..tic..WHAM!..BANG! F*&K!!!", they'd have to keep the magazines under the counter with the other men's publications click the clicky to join the site.... http://67-72chevytrucks.com/vboard/payments.php 67 lwb..first hotrod in 25 years..540 best ET is 9.45 @ 141.44 Anderson,CA

08-11-2003, 07:08 PM	#3
DMAN Registered User Join Date: May 2002 Location: Benicia,Ca. Posts: 128	I wonder what the idle quality and vacuum would be like? You think G.M. Fast Burn heads would be a better choice? __________________ '71 Custom Deluxe K10, shortbed, fleetside.

08-11-2003, 07:14 PM	#4
bigjimzlll Senior Member Join Date: Dec 2001 Location: Redding,CA...USA Posts: 4,736	it will sound almost stock with that cam...trick flow twisted wedge...afr..pro1s..protoplines...anyone would be a good choice in an aluminum head __________________ It's called "drag racing" if they called it "tic..tic..WHAM!..BANG! F*&K!!!", they'd have to keep the magazines under the counter with the other men's publications click the clicky to join the site.... http://67-72chevytrucks.com/vboard/payments.php 67 lwb..first hotrod in 25 years..540 best ET is 9.45 @ 141.44 Anderson,CA

08-11-2003, 08:30 PM	#5
DMAN Registered User Join Date: May 2002 Location: Benicia,Ca. Posts: 128	I'm more interested in having a lot of low end torque, could I retain those numbers with a set of iron heads or would I have to lower the compression to 9.0:1 and lose some power? Thanks. __________________ '71 Custom Deluxe K10, shortbed, fleetside.

08-11-2003, 08:35 PM	#6
bigjimzlll Senior Member Join Date: Dec 2001 Location: Redding,CA...USA Posts: 4,736	as long as you keep the proper quench of between .035-.045 and use an iron head with an effiecient chamber design 9.5-1 is not out of the question...maybe in the summer.. jump up to 89 octain __________________ It's called "drag racing" if they called it "tic..tic..WHAM!..BANG! F*&K!!!", they'd have to keep the magazines under the counter with the other men's publications click the clicky to join the site.... http://67-72chevytrucks.com/vboard/payments.php 67 lwb..first hotrod in 25 years..540 best ET is 9.45 @ 141.44 Anderson,CA

08-11-2003, 08:48 PM	#7
crazy longhorn Fabricate till you "puke" Join Date: Jun 2002 Location: Ill Posts: 9,403	my guess is that the tork# are a little optimistic.....hp probably about right with the 200 cc runners. the cam is pretty mild, & should idle darn near smooth in a 383. At 9.5 to 1 on pump fuel, I think I would be tempted to go a little bigger on the cam.......it wont hurt the bottom end on the 383 too much to be in the 220-224 dur range @ .050 on the intake side, & about 230 on the exhaust side. A lot depends on gearing tho.... My 383 could use a little more cam (Comp XE 268, .477/.480, 224/230 @ .050). The edelbrock heads are 170 cc runners, & the thing is torkey as he!!........but i have a lot of gears crazyL __________________ 69 longhorn,4" chop,3/5 drop, 1/2 ton suspension/disc brakes,1 1/2" body drop,steel tilt clip, 5.3/Edelbrock rpm intake/600 carb, Hooker streetrod shorties,2 1/2" exhaust/ H pipe/50's Flows , 6 spd Richmond trans,12 bolt/ 3.40 gears....

08-11-2003, 11:14 PM	#8
rin68 Senior Member Join Date: Mar 2000 Location: East Peoria, IL Posts: 600	sounds a lot like my combo, cept for the heads. i have a hard time beleiveing magazine power/torque numbers, especially if they're off that magic dyno out in california. with that cam the engine would idle smooth, my 383 is running 222/230 @050 and it purrs like a kitten; gobs and gobs of low end torque, details of the engine are below __________________ 1968 C10 - 383, non-stop project 1969 Camaro - 327, bone stock family heirloom...soon to be LS/T56, Ridetech, all the goodies

08-12-2003, 12:22 AM	#9
DMAN Registered User Join Date: May 2002 Location: Benicia,Ca. Posts: 128	So if my goal is maximum low end torque with a smooth idle,would I be better off with a little bigger cam and heads in the 180cc-190cc range or stay with the 200cc? I'm running 3.73 gears in the rear and plan on swapping in a 700R4 when I replace my engine. Thanks. __________________ '71 Custom Deluxe K10, shortbed, fleetside.



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