Mods to L48
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Joined: Jul 2001
Posts: 71
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From: Frederiksberg, Denmark
Mods to L48
Hi all,
My L48 broke down during highway driving. :cry It will now be taken apart and restored. :) Since the engine is out of the Vette (red '79) I am considering doing some modifications. What would you suggest of modifications to a L48 that is mostly used for cruising (no drag racing)? Cost is not an issue at this point.
My L48 broke down during highway driving. :cry It will now be taken apart and restored. :) Since the engine is out of the Vette (red '79) I am considering doing some modifications. What would you suggest of modifications to a L48 that is mostly used for cruising (no drag racing)? Cost is not an issue at this point.
Safety Car
Joined: Aug 2001
Posts: 3,681
Likes: 200
From: Waterford Mi
Re: Mods to L48 (Vettelaw)
Here is what I did:
1973 L-48
Engine: 350 cubic inch
Upgrades
Compression: 9.5:1 (.030" over with flat top pistons)
Camshaft: Crane Powermax Cam & lifter kit #114132
.440/.454 lifts
210/216 duration
114 Degree lobe seperation
Valve spring & retainer kit # 11308-1
Intake Manifold: Edelbrock Preformer aluminum #2101
Carburetor: Holley #4175
650 CFM/vacume secondary
Tach: Mallory Unilite opto/electric module
Timing idle: 22* BTDC
Timing @ 3000rpm: 51* BTDC
Trans: Turbo 400 auto
Rear Gear ratio: 3.08:1 changed to 3.55:1
[Modified by redwingvette, 11:38 AM 10/29/2001]
[Modified by redwingvette, 11:39 AM 10/29/2001]
1973 L-48
Engine: 350 cubic inch
Upgrades
Compression: 9.5:1 (.030" over with flat top pistons)
Camshaft: Crane Powermax Cam & lifter kit #114132
.440/.454 lifts
210/216 duration
114 Degree lobe seperation
Valve spring & retainer kit # 11308-1
Intake Manifold: Edelbrock Preformer aluminum #2101
Carburetor: Holley #4175
650 CFM/vacume secondary
Tach: Mallory Unilite opto/electric module
Timing idle: 22* BTDC
Timing @ 3000rpm: 51* BTDC
Trans: Turbo 400 auto
Rear Gear ratio: 3.08:1 changed to 3.55:1
[Modified by redwingvette, 11:38 AM 10/29/2001]
[Modified by redwingvette, 11:39 AM 10/29/2001]
Melting Slicks
Joined: Apr 1999
Posts: 2,010
Likes: 3
From: Moon Twp. PA USA
Re: Mods to L48 (Vettelaw)
Vettelaw:
Check my signature. Well satisfied with the mods I made. Made them all with the engine in the car. If the engine was out, I would probably have gone for an overbore and flat top pistons. Like you, I don't drag race, but the car now runs like a high performance sports car, as intended.
Any questions, E-Mail me.
Check my signature. Well satisfied with the mods I made. Made them all with the engine in the car. If the engine was out, I would probably have gone for an overbore and flat top pistons. Like you, I don't drag race, but the car now runs like a high performance sports car, as intended.
Any questions, E-Mail me.
Intermediate
Joined: Jun 2001
Posts: 46
Likes: 0
From: Sydney, NSW, Australia
Re: Mods to L48 (Rhys)
mines a very drivable mod, not cheep tho:
AFR 190 heads
hypereutectic pistons
balanced
cam around .450 lift, mine is .458 with a mild duration (a hyd-roller cam would be better)
1.6 twin shaft mounted roller rockers
RPM airgap (yet to go on, have performer on atm)
square bore 650 double pumper HP series (will go on with manifold)
should look into getting your transmition reconditioned. mine was losing
power and made sloppy shifts. I had it changed before the mod.
the rear spring died when it came under the pressure of the mod and I
swapped it for a fibre spring
The AFR 190 heads is probably the major contributor here. gives great torque.
I love the engine. I hope this info helps.
Chris :cheers:
AFR 190 heads
hypereutectic pistons
balanced
cam around .450 lift, mine is .458 with a mild duration (a hyd-roller cam would be better)
1.6 twin shaft mounted roller rockers
RPM airgap (yet to go on, have performer on atm)
square bore 650 double pumper HP series (will go on with manifold)
should look into getting your transmition reconditioned. mine was losing
power and made sloppy shifts. I had it changed before the mod.
the rear spring died when it came under the pressure of the mod and I
swapped it for a fibre spring
The AFR 190 heads is probably the major contributor here. gives great torque.
I love the engine. I hope this info helps.
Chris :cheers:
Safety Car
Joined: Aug 2001
Posts: 3,681
Likes: 200
From: Waterford Mi
Re: Mods to L48 (Gleese79)
I wish I had a little more low end torque but I didn't have the heads ported matched. She will still lite um up any time I want but 0-60 times are not as fast as I would like. The Intake helped alot. I didn't need the Holley but I was tired of messing around with the Q-jet.
As far as how much I spent:
Block bored (0.30" over) +
Heads gone through ( 2 Valves replaced)+
Flat Top Pistons+
Rings +
Barrings +
Crank ground +
Cam, lifters, and springs +
gasket set (Felpro Head gaskets)
Total = $1300
water pump & starter $75.00
Carb $300.00
Intake $104.00
[Modified by redwingvette, 11:46 AM 10/30/2001]
As far as how much I spent:
Block bored (0.30" over) +
Heads gone through ( 2 Valves replaced)+
Flat Top Pistons+
Rings +
Barrings +
Crank ground +
Cam, lifters, and springs +
gasket set (Felpro Head gaskets)
Total = $1300
water pump & starter $75.00
Carb $300.00
Intake $104.00
[Modified by redwingvette, 11:46 AM 10/30/2001]
