Stock l48 upgrades

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May 18, 2014 | 10:43 AM

corvettenutz

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Stock l48 upgrades

stock l48 with performer intake. q-jet,auto .308 gears, manifolds (2" rams horn with about 3 inches of 2" pipe coming out of manifold and then to 2.5 pipe )true 2.5 with flowmasters .Mallory HEI. This car is a DOGG.. Although seems to "Run" and Idle Excellent. looking for more torque.

Any ideas out there? Got about 2000-3000 to spend .I do have a performer vortec intake sitting on the shelf with a road demon 625 on it . heads/cam? Car revs REAL slow,sounds like it is running out of steam at 4000 rpm although will shift at 4900 or so.

May 18, 2014 | 10:44 AM

corvettenutz

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This is a 75 corvette 47k

May 18, 2014 | 10:48 AM

'75

Le Mans Master

Joined: Dec 2007

Posts: 6,422

Likes: 591

From: McHenry Illinois

I went with vortec iron gm heads and a summit 1103 cam, pepped it right up. You already have the right manifold and a good budget so maybe roller cam and aluminum vortec heads.

May 18, 2014 | 10:56 AM

bluedawg

Safety Car

Joined: Jan 2009

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From: anchorage ak

Afr heads and a roller cam. Save more, get headers and new exhaust.

May 18, 2014 | 11:25 AM

gerry72

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Joined: Aug 2000

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From: San Antonio TX

I would be inclined to go with a good set of heads and a swap to a 3.55 gear. You won't see anything from an intake/carburetor swap if your originals are in good order.

May 18, 2014 | 11:40 AM

qwank

Le Mans Master

Joined: Feb 2011

Posts: 5,943

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From: Southern NH

start with long tube headers and full 2.5'' pipes and a set of aftermarket heads. any heads will be better than the stock ones. and change the cam also. should be well within your budget. I would do the intake also more for weight savings than anything else. get the stock carb professionally rebuilt and you will be all set

May 18, 2014 | 12:03 PM

mrvette

Team Owner

Joined: Jul 1999

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From: Orange Park Florida

I"d put L98 injection on it, and headers and Magnaflow stainless muffs....woke my L48 up nicely in my '72 vette....

you maybe run a little more cam, but don't go ape with it.....

May 18, 2014 | 12:18 PM

Patro46

Pro

Joined: Nov 2013

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From: Catoosa Okla

Are you concerned about originality?

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May 18, 2014 | 12:25 PM

bebezote

Pro

Joined: May 2013

Posts: 653

Likes: 36

Quote:

Originally Posted by Patro46

Are you concerned about originality?

great point !

check to see if you have solid fan... makes any car a dog..i mean dog... if solid < clutch...then < best electric..

May 18, 2014 | 01:29 PM

#10

scottyp99

Le Mans Master

Joined: Mar 2008

Posts: 5,948

Likes: 72

From: Oxford MA-----You just lost the game!!!!

http://www.speedwaymotors.com/Flo-Te...lug,25118.html

http://www.summitracing.com/parts/su...make/chevrolet

http://www.summitracing.com/parts/bi...model/corvette

http://www.summitracing.com/parts/fe...make/chevrolet

If it's an automatic, give serious consideration to swapping in a 700-r4 transmission. The 3.06 first gear will give you some more squirt off the line, and the overdrive will let you cruise effortlessly on the highway. A lot of people who have done it say that it was the best mod they ever performed on their 'vette.

Scott

May 18, 2014 | 03:56 PM

#11

corvettenutz

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Instructor

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not really concerned about originality.

May 18, 2014 | 04:39 PM

#12

Ralphbf

Burning Brakes

Joined: Feb 2011

Posts: 849

Likes: 0

From: Woodland California

Quote:

Originally Posted by corvettenutz

not really concerned about originality.

This is what I'm running:
https://www.lunatipower.com/Product....d=2324&gid=287

Edelbrock performer
Summit Headers
Edelbrock 750

I have a set of ZZ4 heads but could use AFR 220

I put out an honest 280 rear wheel horsepower and I get 20mpg.

I re-ringed the stock block at 90,000 miles and put in a new Scat crank

Ralph

May 18, 2014 | 08:25 PM

#13

augiedoggy

Le Mans Master

Joined: May 2007

Posts: 5,020

Likes: 1,120

From: North tonawanda NY

Quote:

Originally Posted by Ralphbf

I also went with this cam... powerband comes in nice and low and its all in by 5500-6k..... I went with dart iron eagle heads and desktop dyno200 estimates 396hp and 414lbs of torque.... this is a rebuilt engine waiting to go into the car (I also put a scat crank in it with flat top pistons, an rpm performer clone intake and 650 edelbrock carb.) not the original L48 which is coming out.

Last edited by augiedoggy; May 18, 2014 at 08:27 PM.

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