L48 Build Question
Thread Starter
Instructor
Joined: May 2005
Posts: 229
Likes: 0
From: Oreland PA
L48 Build Question
I just took apart my 76 L48 and I plan to do the following
1) 600-650 holley
2) dual plane alum manifold
3) probably a set of 202 heads
4) 480 lift cam
5) double roller timing chain
Will I need a new timing cover or will the double roller chain fit under the stock pan.
I also plan on using the stock exhaust manifolds as I want the engine to appear fairly stock when I put it back in.
Does anyone have any suggestions,comments? does this sound like a good combo. I am not looking to race the car but to give it a little kick.
thanks
1) 600-650 holley
2) dual plane alum manifold
3) probably a set of 202 heads
4) 480 lift cam
5) double roller timing chain
Will I need a new timing cover or will the double roller chain fit under the stock pan.
I also plan on using the stock exhaust manifolds as I want the engine to appear fairly stock when I put it back in.
Does anyone have any suggestions,comments? does this sound like a good combo. I am not looking to race the car but to give it a little kick.
thanks
Drifting
Joined: Sep 2006
Posts: 1,986
Likes: 21
From: Columbus MN
Pay close attention to the height of the intake manifold you choose. You don't have much clearance between your air cleaner and hood.
I don't know what the air cleaner base is like on a '76, but I know my stock air cleaner wouldn't work on the Hollie that came with my GM 350 HO crate engine.
I don't know what the air cleaner base is like on a '76, but I know my stock air cleaner wouldn't work on the Hollie that came with my GM 350 HO crate engine.
Le Mans Master
Joined: Oct 2006
Posts: 7,123
Likes: 433
From: Gladstone MO
C3 of Year Finalist (appearance mods) 2019
A double row timing set will fit under your stock cover with no problems. You didn't give all the specs for your cam, but whatever thay are, the stock manifolds are going to choke it to death (IMHO). I had a 350 years ago that I used the GM 3927140 cam. With a 4sp, good headers, etc. It was advertised as the first design Z-28 "off-road". Pain in the behind around town- not much low end torque. I tried a 650 cfm Holley- it flat ran out of air at 6000 rpm. Ended up with a 750.
Thread Starter
Instructor
Joined: May 2005
Posts: 229
Likes: 0
From: Oreland PA
[QUOTE=TimAT;1558367868]A double row timing set will fit under your stock cover with no problems. You didn't give all the specs for your cam, but whatever thay are, the stock manifolds are going to choke it to death (IMHO). I had a 350 years ago that I used the GM 3927140 cam. With a 4sp, good headers, etc. It was advertised as the first design Z-28 "off-road". Pain in the behind around town- not much low end torque. I tried a 650 cfm Holley- it flat ran out of air at 6000 rpm. Ended up with a 750.[/QUO
we are thinking of a comp cams 470 lift 224 duration cam. It will also use stock pistons. we checked the block, bore etc and they are all in great shape. Just trying to give it a little kick.
we are thinking of a comp cams 470 lift 224 duration cam. It will also use stock pistons. we checked the block, bore etc and they are all in great shape. Just trying to give it a little kick.
Le Mans Master
Joined: May 2006
Posts: 7,708
Likes: 266
From: indy indiana
yes,your plan will work for " just give it a little kick". I believe you will be pleasently surprised with the differance..to bad you dont want headers, that kinda holds the whole setup back.
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Thread Starter
Instructor
Joined: May 2005
Posts: 229
Likes: 0
From: Oreland PA
I agree but I like the stock look. I guess no one makes something stock looking that would work
Thread Starter
Instructor
Joined: May 2005
Posts: 229
Likes: 0
From: Oreland PA
Is there any intake I need to stay away from due to clearance between the stock air cleaner and the hood? I am going to use the q jet as suggested.
I am also thinking of getting a set co the summit cast iron 202 heads.
I am also thinking of getting a set co the summit cast iron 202 heads.
Burning Brakes
Joined: Aug 2006
Posts: 1,155
Likes: 0
From: San Diego California
You may want to consider 180cc heads, with the edelbrock performer manifold and 600-650 carb, or the 750 Q Jet as the better choice. Before you buy, you might want to read Lingenfelter's book on building the small block; or Chevy Hi Performance small block buildup. They both have great advise for cam heads manifold and carb seletions for max performance- depending on your intended use of the car.
Pro
Joined: Apr 2006
Posts: 647
Likes: 22
From: Norwalk CT and Boynton Beach FL
I put an Edelbrock Performer intake manifold on my 75 L-82 and needed to go to a drop base air cleaner so the hood would close.
Pro
Joined: Apr 2006
Posts: 647
Likes: 22
From: Norwalk CT and Boynton Beach FL
I also replaced the Q-jet with an Edelbrock carb that mounted on the Performer intake manifold --- perhaps that's why the old air cleaner wouldn't fit
"Rodstoration &am p;quot; In Progres
Joined: Jun 2004
Posts: 1,397
Likes: 1
From: Frisco TX
I have an original L48 in my 1980 which we built...but didn't worry about the stock look this time. Here are some specs and the last dyno tune (372hp and 427tq at rear wheels)
L48 stroked 383
SRP forged flat tops
Forged crank and rods
Edelbrock RPM 64cc heads (ported and polished)
Edelbrock RPM air-gap intake
Demon 750 with manual secondaries
Comp Extreme Energy 274 roller cam
Hooker Comp headers
Summit drop base cleaner with filter top
L48 stroked 383
SRP forged flat tops
Forged crank and rods
Edelbrock RPM 64cc heads (ported and polished)
Edelbrock RPM air-gap intake
Demon 750 with manual secondaries
Comp Extreme Energy 274 roller cam
Hooker Comp headers
Summit drop base cleaner with filter top
