'73 L48 engine upgrade advice
Drifting
Joined: Dec 2005
Posts: 1,360
Likes: 3
From: NORTHEAST
Got a response back, from AFR tech Jerami Patrick.
Part of what he said:
"I would recommend a set of our 195cc Eliminators. Your specific combination would be able to harness the power potential of these heads. They flow remarkably well while retaining a relatively small intake runner volume. This increases the velocity of the intake charge resulting in not only a peak horsepower gain but also an increase in bottom end power."
"You’ll need a spring exchange if you’re going to run a flat tappet cam, have the heads ordered with an 8064 spring exchange or consider upgrading to a roller cam which the head is already setup for."
For the 383, KB 718 forged flat-top pistons, Scat 6'' 7/16 strocker rods, Scat 2.75 9000 series. steel strocker crank...540hp 500ft/lbs..
Part of what he said:
"I would recommend a set of our 195cc Eliminators. Your specific combination would be able to harness the power potential of these heads. They flow remarkably well while retaining a relatively small intake runner volume. This increases the velocity of the intake charge resulting in not only a peak horsepower gain but also an increase in bottom end power."
"You’ll need a spring exchange if you’re going to run a flat tappet cam, have the heads ordered with an 8064 spring exchange or consider upgrading to a roller cam which the head is already setup for."
For the 383, KB 718 forged flat-top pistons, Scat 6'' 7/16 strocker rods, Scat 2.75 9000 series. steel strocker crank...540hp 500ft/lbs..
For the 383, KB 718 forged flat-top pistons, Scat 6'' 7/16 strocker rods, Scat 2.75 9000 series. steel strocker crank...540hp 500ft/lbs..
Le Mans Master
Joined: Mar 2008
Posts: 5,948
Likes: 72
From: Oxford MA-----You just lost the game!!!!
Sure it could, if it had a 4.71" bore!! (I'll admit, it would be pretty hard to do with a 4.4" bore center.........)
If your 383 project will really be 10 years down the road, I think you would be best served to optimize your combo for the 350 CID now. Who knows what sort of super heads might be available 10 years from now? The Gen1 SBC might be well on it's way down the same road as the flathead Ford in 10 years, who can really say for sure? Hell, gasoline might cost 20 bucks a gallon 10 years from now, you might put a little 4 cylinder in it by then. Who knows? My point is, optimize your project for now, start worrying about 10 years from now in about 8-9 years or so.
Scott
If your 383 project will really be 10 years down the road, I think you would be best served to optimize your combo for the 350 CID now. Who knows what sort of super heads might be available 10 years from now? The Gen1 SBC might be well on it's way down the same road as the flathead Ford in 10 years, who can really say for sure? Hell, gasoline might cost 20 bucks a gallon 10 years from now, you might put a little 4 cylinder in it by then. Who knows? My point is, optimize your project for now, start worrying about 10 years from now in about 8-9 years or so.
Scott
Thread Starter
Instructor
Joined: Dec 2009
Posts: 195
Likes: 0
From: Chesterfield Virginia
Yup, mistyped, Scat 3.75 9000. Nothing is set in stone on my 383 build, this thread was really just started to pick a set of heads then it morphed along the way.
Scott,
Valid point, I'm not really that concerned with the 383 right now, but if I can buy a good set of heads that will work then why not. I might get urge before 10 years pass. Sure hope your prediction about the 4 cylinder is off....
Scott,
Valid point, I'm not really that concerned with the 383 right now, but if I can buy a good set of heads that will work then why not. I might get urge before 10 years pass. Sure hope your prediction about the 4 cylinder is off....
Thread Starter
Instructor
Joined: Dec 2009
Posts: 195
Likes: 0
From: Chesterfield Virginia
My shopping list thus far:
AFR 195cc Eliminator heads with 8064 springs
Comp Cams 1416-16 Magnum steel roller tip rocker
Summit K1103 cam and lifters
Fel-Pro Q1094 Head Gasket
Fel-Pro Q1604 Valve Cover Gasket
Fel-Pro 1205 intake gasket
Missing anything? Sure went over that $1500, need to buy the wife some shoes I guess.....
Le Mans Master
Joined: Mar 2008
Posts: 5,948
Likes: 72
From: Oxford MA-----You just lost the game!!!!
Yup, mistyped, Scat 3.75 9000. Nothing is set in stone on my 383 build, this thread was really just started to pick a set of heads then it morphed along the way.
Scott,
Valid point, I'm not really that concerned with the 383 right now, but if I can buy a good set of heads that will work then why not. I might get urge before 10 years pass. Sure hope your prediction about the 4 cylinder is off....
Scott,
Valid point, I'm not really that concerned with the 383 right now, but if I can buy a good set of heads that will work then why not. I might get urge before 10 years pass. Sure hope your prediction about the 4 cylinder is off....
Scott
Race Director
Joined: May 2005
Posts: 10,674
Likes: 122
From: Millington Illinois
St. Jude Donor '08-'09
Thanks for pointing that out, I would have bought a .041 gasket. I've never had the deck cut, and to the best of my knowledge I was the first to rebuild this engine. The engine serial is still clearly visible.
My shopping list thus far:
AFR 195cc Eliminator heads with 8064 springs
Comp Cams 1416-16 Magnum steel roller tip rocker
Summit K1103 cam and lifters
Fel-Pro Q1094 Head Gasket
Fel-Pro Q1604 Valve Cover Gasket
Fel-Pro 1205 intake gasket
Missing anything? Sure went over that $1500, need to buy the wife some shoes I guess.....
My shopping list thus far:
AFR 195cc Eliminator heads with 8064 springs
Comp Cams 1416-16 Magnum steel roller tip rocker
Summit K1103 cam and lifters
Fel-Pro Q1094 Head Gasket
Fel-Pro Q1604 Valve Cover Gasket
Fel-Pro 1205 intake gasket
Missing anything? Sure went over that $1500, need to buy the wife some shoes I guess.....
Le Mans Master
Joined: Apr 2006
Posts: 5,403
Likes: 95
Thanks for pointing that out, I would have bought a .041 gasket. I've never had the deck cut, and to the best of my knowledge I was the first to rebuild this engine. The engine serial is still clearly visible.
My shopping list thus far:
AFR 195cc Eliminator heads with 8064 springs
Comp Cams 1416-16 Magnum steel roller tip rocker
Summit K1103 cam and lifters
Fel-Pro Q1094 Head Gasket
Fel-Pro Q1604 Valve Cover Gasket
Fel-Pro 1205 intake gasket
Missing anything? Sure went over that $1500, need to buy the wife some shoes I guess.....
My shopping list thus far:
AFR 195cc Eliminator heads with 8064 springs
Comp Cams 1416-16 Magnum steel roller tip rocker
Summit K1103 cam and lifters
Fel-Pro Q1094 Head Gasket
Fel-Pro Q1604 Valve Cover Gasket
Fel-Pro 1205 intake gasket
Missing anything? Sure went over that $1500, need to buy the wife some shoes I guess.....
Engines are fun they just nichol dime you to death.
Its been a billion yrs since i done it but to drop the pan you will have to remove the two idler arm bolts that go through the frame. This will allow you to lower junk atached to it enough to lower the pan. It looked like you had an aftermarket pan keep in mind theres two different pan gaskets one uses a thicker front pan seal.
then if your going to 1.6 rockers length needed on your pushrods can change.
Last edited by Little Mouse; Jan 27, 2012 at 07:51 PM.
Race Director
Joined: Jan 2000
Posts: 12,399
Likes: 247
From: San Jose CA
As 63mako implied, you can do the cam without dropping the pan, although it's much easier to get a good seal by dropping the pan.
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Thread Starter
Instructor
Joined: Dec 2009
Posts: 195
Likes: 0
From: Chesterfield Virginia
Appreciate everyones input! 
Shark Racer,
I'll drop the pan if thats the best way to get a good seal, thanks.
63mako,
You mentioned breaking in the cam prior to putting on the 1.6 rockers, how many miles?
Little Mouse,
After break in I'll order a checking pushrod and determine length, thanks.
Shark Racer,
I'll drop the pan if thats the best way to get a good seal, thanks.
63mako,
You mentioned breaking in the cam prior to putting on the 1.6 rockers, how many miles?
Little Mouse,
After break in I'll order a checking pushrod and determine length, thanks.
Thread Starter
Instructor
Joined: Dec 2009
Posts: 195
Likes: 0
From: Chesterfield Virginia
Race Director
Joined: May 2005
Posts: 10,674
Likes: 122
From: Millington Illinois
St. Jude Donor '08-'09
Appreciate everyones input!
Shark Racer,
I'll drop the pan if thats the best way to get a good seal, thanks.
63mako,
You mentioned breaking in the cam prior to putting on the 1.6 rockers, how many miles?
Little Mouse,
After break in I'll order a checking pushrod and determine length, thanks.
Shark Racer,
I'll drop the pan if thats the best way to get a good seal, thanks.
63mako,
You mentioned breaking in the cam prior to putting on the 1.6 rockers, how many miles?
Little Mouse,
After break in I'll order a checking pushrod and determine length, thanks.
Last edited by 63mako; Jan 28, 2012 at 12:42 AM.
Race Director
Joined: May 2005
Posts: 10,674
Likes: 122
From: Millington Illinois
St. Jude Donor '08-'09
Got a response back, from AFR tech Jerami Patrick.
Part of what he said:
"I would recommend a set of our 195cc Eliminators. Your specific combination would be able to harness the power potential of these heads. They flow remarkably well while retaining a relatively small intake runner volume. This increases the velocity of the intake charge resulting in not only a peak horsepower gain but also an increase in bottom end power."
"You’ll need a spring exchange if you’re going to run a flat tappet cam, have the heads ordered with an 8064 spring exchange or consider upgrading to a roller cam which the head is already setup for."
For the 383, KB 718 forged flat-top pistons, Scat 6'' 7/16 strocker rods, Scat 2.75 9000 series steel strocker crank...540hp 500ft/lbs...
Part of what he said:
"I would recommend a set of our 195cc Eliminators. Your specific combination would be able to harness the power potential of these heads. They flow remarkably well while retaining a relatively small intake runner volume. This increases the velocity of the intake charge resulting in not only a peak horsepower gain but also an increase in bottom end power."
"You’ll need a spring exchange if you’re going to run a flat tappet cam, have the heads ordered with an 8064 spring exchange or consider upgrading to a roller cam which the head is already setup for."
For the 383, KB 718 forged flat-top pistons, Scat 6'' 7/16 strocker rods, Scat 2.75 9000 series steel strocker crank...540hp 500ft/lbs...
