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12/13/10 5:41pm - Original Message: 'crate gm 350 upgrades'
Voltage
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Sicklerville, NJ - USA

Vette(s):
1971 350 steel cities grey coupe 4 spd

Joined: 12/11/2010
Posts: 17
I have a 1971 corvette 4 spd with gm crate motor 10067353 in it.  I am looking to get more out of this engine while keeping it streetable.  Some people have told me I can change out the heads, intake, and cam and get great results.  Others say I should just buy a new engine.  I am not a motorhead although I am trying to read as much as possible.  If anybody has any experience with modifying engines I would appriciate and information.   Thank You for your time..
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12/13/10 6:13pm - Reply: 'crate gm 350 upgrades'
stingrayjim jr Lifetime Member
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SHELBYVILLE, TN - USA

Vette(s):
1976 L48 auto

1978 L82 4speed

1994 LT1 6speed

Joined: 7/5/2002
Posts: 3934
Well, what you got there is a 195 hp engine... 4 bolt main, 76cc heads with 1.94 intake, 1.50 exhaust valve, .383 lift intake 194 duration, .401 lift exhaust lift 202 duration, and.. 8.5 compression ratio...  with all that known,  a cam change and head change would do a world of change.  As for what to change them to, well, everyone has their own idea of that.  Ask around for a good cylinder head type(preferrably a 64 cc, maybe a 58cc chamber) and a good camshaft profile(old school designation would be about a 262 to 270 duration...get any higher and you could have vacuum issues at low rpm(ie headlights not wanting to raise easily :)

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StingrayJim
NCM Lifetime Member #1936

Stingray's '76 StingrayJr's '78Lil Red '94

(click each one to see a bigger version)
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12/13/10 6:29pm - Reply: 'crate gm 350 upgrades'
Voltage
Former Member
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Sicklerville, NJ - USA

Vette(s):
1971 350 steel cities grey coupe 4 spd

Joined: 12/11/2010
Posts: 17
One shop I was talking to was recommending Edelbrock E-tec 170 alluminum heads.  Any input on these heads?

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12/13/10 9:33pm - Reply: 'crate gm 350 upgrades'
CCasey
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New Albany, OH - USA

Vette(s):
1980 Coupe / Snowcrest White / L48, 350 / Comp Cam / Edelbrock Heads / Cyclone Intake / Holley Carb / Holley Fuel Pump / Patriot Headers / Dual Exhaust / Magnaflow Mufflers / 1964 Coupe / Riverside Red / L76, 327, 365hp

Joined: 8/17/2010
Posts: 173
I just went through an engine upgrade with my '80.  I ended-up with the following modifications.
 
Comp Cam Hydraulic Roller CamDuration @ .050: 210 intake; 220 exhaust; Lobe Lift: .3340 intake; .3420 exhaust; Lobe Separation: 112-degrees; Gross Valve Lift: .501 intake; .513 exhaust.

Edelbrock E-Street Aluminum Cylinder Heads2.02-inch intake / 1.60-inch exhaust Valves;  64-cc Combustion Chambers; CR: 9.7:1 (measured).

Holley Street Avenger 770-cfm Carburetor.

Patriot Ceramic-Coated Tight-Tuck Exhaust Headers:  1 5/8-inch Primaries; 2 ½-inch Collectors.

Corvette Central 2 ½-inch Aluminum Dual Exhaust.
Magnaflow 2 ½-inch Mufflers.
Chevy 14 x 3-inch Chrome Performance Air Cleaner.
 
The car now runs significantly better than before.  The mechanic I work with estimates that it is probably putting out about 350 - 370 hp.  We plan on dyno-tunning the engine this spring to verify hp.


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Chuck

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12/13/10 9:34pm - Reply: 'crate gm 350 upgrades'
CCasey
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New Albany, OH - USA

Vette(s):
1980 Coupe / Snowcrest White / L48, 350 / Comp Cam / Edelbrock Heads / Cyclone Intake / Holley Carb / Holley Fuel Pump / Patriot Headers / Dual Exhaust / Magnaflow Mufflers / 1964 Coupe / Riverside Red / L76, 327, 365hp

Joined: 8/17/2010
Posts: 173
I forgot to include the Cyclone Plus intake manifold.

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Chuck

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12/14/10 12:29am - Reply: 'crate gm 350 upgrades'
lukesvette Lifetime Member
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HOWELL, NJ - USA

Vette(s):
1979, Targa Blue (72 Color), Pace Car rear spoiler, L88 hood, Dark blue factory interior, 525HP 406, HD 700R4, 370 gears,Steeroids, composite rear spring, TT IIs wrapped in T/A Radials.

Joined: 5/18/2004
Posts: 6804
Chuck's combo is a good one.  I had a 327 with Edelbrock heads, performer RPM manifold, Comp Cams 270H cam, headers, duals and a 2600 stall. That little 327 screamed!!

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12/14/10 6:58am - Reply: 'crate gm 350 upgrades'
Voltage
Former Member
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Sicklerville, NJ - USA

Vette(s):
1971 350 steel cities grey coupe 4 spd

Joined: 12/11/2010
Posts: 17
Thanks for all the information. Roughly how much would something like that set me back?

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12/14/10 7:46am - Reply: 'crate gm 350 upgrades'
lukesvette Lifetime Member
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HOWELL, NJ - USA

Vette(s):
1979, Targa Blue (72 Color), Pace Car rear spoiler, L88 hood, Dark blue factory interior, 525HP 406, HD 700R4, 370 gears,Steeroids, composite rear spring, TT IIs wrapped in T/A Radials.

Joined: 5/18/2004
Posts: 6804
Heads.      $1000
cam, lifters and pushrods. $150
intake   $125
headers -   $100 (cheapest)
carb - $275 - I'd go with an Edelbrock
gaskets, RTV, plugs etc - $75
timing chain $60 (always replace if you're swapping a cam unless it has low mileage on it)
water pump - same rule as above!! $50

edelbrock also sells kits with the heads, cam, lifters, intake and carb. I think they also include gaskets. May save you a few dollars.

Good luck!!

Paul   

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LukesVette Homepage
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101st Airborne(AirAssault!)
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12/14/10 11:16am - Reply: 'crate gm 350 upgrades'
lukesvette Lifetime Member
Lifetime Member
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HOWELL, NJ - USA

Vette(s):
1979, Targa Blue (72 Color), Pace Car rear spoiler, L88 hood, Dark blue factory interior, 525HP 406, HD 700R4, 370 gears,Steeroids, composite rear spring, TT IIs wrapped in T/A Radials.

Joined: 5/18/2004
Posts: 6804

Example of an Edelbrock Kit

http://www.summitracing.com/parts/EDL-2099/



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LukesVette Homepage
Veteran of Operation Iraqi Freedom
101st Airborne(AirAssault!)
God Bless America

Support Our Troops


     
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12/14/10 1:19pm - Reply: 'crate gm 350 upgrades'
CCasey
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New Albany, OH - USA

Vette(s):
1980 Coupe / Snowcrest White / L48, 350 / Comp Cam / Edelbrock Heads / Cyclone Intake / Holley Carb / Holley Fuel Pump / Patriot Headers / Dual Exhaust / Magnaflow Mufflers / 1964 Coupe / Riverside Red / L76, 327, 365hp

Joined: 8/17/2010
Posts: 173

The cost of my upgrades was as follows.

Cam, etc: $1185, (Cam: $275; Lifters: $405; Springs: $74; Retainers: $21; Locks: $44; Timing Chain: $22; Wear Plate: $16; Roller Tip Rockers: $135; Long Slot Rockers: $73; Guidplates: $17; Studs: $19; Pushrods: $84).
Carb: $400.
Exhaust System: $630, (Headers, Exhaust, & Mufflers).
Aluminum Heads: $900.
Air Cleaner: $48.
Intake Manifold: $300.
 


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Chuck

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12/16/10 7:25pm - Reply: 'crate gm 350 upgrades'
Voltage
Former Member
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Sicklerville, NJ - USA

Vette(s):
1971 350 steel cities grey coupe 4 spd

Joined: 12/11/2010
Posts: 17
Has anybody used Edelbrock cam number 7102?  What do you think of it?


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12/17/10 2:13am - Reply: 'crate gm 350 upgrades'
2tonevette1981
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Hillsboro, TX - USA

Vette(s):
1981 beige/bronze

Joined: 3/2/2008
Posts: 147
I am in the process of building a new motor for my 81. I started with a block and crank from a 69 chevlle. I put a comp cam 268 xtreme part number CL12-242-2. I am using the original heads with 1.5 ratio roller rockers. I am going to use a Edelbrock performer rpm intake and 600 cfm carb. The intake is a little large for my setup, but it was free and will work. A friend put all that info in some program and I should get a little over 300hp from this setup.

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