L98 Budget Buildup question
Thread Starter
Burning Brakes
Joined: Aug 2006
Posts: 1,123
Likes: 1
From: Rockland County NY
L98 Budget Buildup question
Please give me your educated opinion on this build. Car is a pleasure cruiser, not a 1/4 mile car. Looking for torque and a nice lopey idle. We are not doing heads as we have been lead to believe that the stock 113 heads can support up to 350 hp which this build should not go over.
Starting point... Stock 91 L98, Z6 trans, 3:45 gears
Plans... Headers and Cat Back system, TPiS Bigmouth Intake and
large tube runners, LT4 Hotcam kit (includes cam, roller
rockers, springs and hdwr.)
Your thoughts???
Starting point... Stock 91 L98, Z6 trans, 3:45 gears
Plans... Headers and Cat Back system, TPiS Bigmouth Intake and
large tube runners, LT4 Hotcam kit (includes cam, roller
rockers, springs and hdwr.)
Your thoughts???
Race Director
Joined: Feb 2004
Posts: 12,518
Likes: 19
Please give me your educated opinion on this build. Car is a pleasure cruiser, not a 1/4 mile car. Looking for torque and a nice lopey idle. We are not doing heads as we have been lead to believe that the stock 113 heads can support up to 350 hp which this build should not go over.
Starting point... Stock 91 L98, Z6 trans, 3:45 gears
Plans... Headers and Cat Back system, TPiS Bigmouth Intake and
large tube runners, LT4 Hotcam kit (includes cam, roller
rockers, springs and hdwr.)
Your thoughts???
Starting point... Stock 91 L98, Z6 trans, 3:45 gears
Plans... Headers and Cat Back system, TPiS Bigmouth Intake and
large tube runners, LT4 Hotcam kit (includes cam, roller
rockers, springs and hdwr.)
Your thoughts???
Racer
Joined: Nov 2008
Posts: 321
Likes: 2
From: Auburndale FL
What is your budget on this build?
I ask because I am toying with doing something similar but my budget would be minimal. Probably 1k or less if possible, I have too much interior work and paint I have to put money in to do a huge build.
I ask because I am toying with doing something similar but my budget would be minimal. Probably 1k or less if possible, I have too much interior work and paint I have to put money in to do a huge build.
Thread Starter
Burning Brakes
Joined: Aug 2006
Posts: 1,123
Likes: 1
From: Rockland County NY
Race Director
Joined: Feb 2004
Posts: 12,518
Likes: 19
I would rather run a conservative cam, that a big one, and the 208 degrees of duration on the zz4 cam matches what you have nicely.
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Le Mans Master
Joined: Sep 2006
Posts: 6,050
Likes: 147
From: Phoenix AZ
2021 C4 of the Year - Modified Finalist
I am using the ramjet 350 cam. it is also used in the high torque 383. It is also referred to as a marine cam.
It supposedly has tremendous low speed torque and outstanding mid range torque.
I should have my engine together in a couple weeks, and will report on torque and how it responds to my driving and engine RPM band once it's in.
I have a 2.58 rear, and have a 3.07 that may find it's way into the car.
I will be changing the trans at the same time.
Hoping for the best since my engine right now cruises at 75mph at 1750 RPM, and I can spin the tires with ease with a healthy trans.
It supposedly has tremendous low speed torque and outstanding mid range torque.
I should have my engine together in a couple weeks, and will report on torque and how it responds to my driving and engine RPM band once it's in.
I have a 2.58 rear, and have a 3.07 that may find it's way into the car.
I will be changing the trans at the same time.
Hoping for the best since my engine right now cruises at 75mph at 1750 RPM, and I can spin the tires with ease with a healthy trans.
Team Owner
Joined: Oct 2004
Posts: 81,241
Likes: 3,063
From: altered state
St. Jude Donor '05
Ramjet 350cam , smaller than the stock one.
This hydraulic roller design is used on the 383 truck and Ramjet 350.
The duration at lash point in degrees (intake/exhaust) is 288/308; duration at .050" tappet lift (intake/exhaust) is 196/206 and maximum lift with 1.5:1 rocker ratio (intake/exhaust) is 431/451. Valve lash is zero/zero and lobe centerline is 109 degrees.
This camshaft is a great upgrade for 1996-2000 Chevy/GMC trucks equipped with the L31 Vortec 350 Engine. This cam is great for additional bottom end torque. If installed in one of these trucks, a custom computer re-program is needed.
Lifters are not included.
The duration at lash point in degrees (intake/exhaust) is 288/308; duration at .050" tappet lift (intake/exhaust) is 196/206 and maximum lift with 1.5:1 rocker ratio (intake/exhaust) is 431/451. Valve lash is zero/zero and lobe centerline is 109 degrees.
This camshaft is a great upgrade for 1996-2000 Chevy/GMC trucks equipped with the L31 Vortec 350 Engine. This cam is great for additional bottom end torque. If installed in one of these trucks, a custom computer re-program is needed.
Lifters are not included.
Thread Starter
Burning Brakes
Joined: Aug 2006
Posts: 1,123
Likes: 1
From: Rockland County NY
here are the specs on the two cams in question...
ZZ4 Cam
(int) 208* (exh) 221* duration @ 050
(int) .474 (exh) .510 lift
lobe seperation 112*
LT4 Hotcam
(int) 218* (exh) 228* duration @ 050
(int) .494 (exh) .494 lift
lobe seperation 112*
Can somebody explain to me (in simple easy to understand language)
what the difference is between these two cams? What do these numbers mean to me as far as performance goes?
Also, does anyone know what the specs are for a stock L98? Just curious to see the difference.
ZZ4 Cam
(int) 208* (exh) 221* duration @ 050
(int) .474 (exh) .510 lift
lobe seperation 112*
LT4 Hotcam
(int) 218* (exh) 228* duration @ 050
(int) .494 (exh) .494 lift
lobe seperation 112*
Can somebody explain to me (in simple easy to understand language)
what the difference is between these two cams? What do these numbers mean to me as far as performance goes?
Also, does anyone know what the specs are for a stock L98? Just curious to see the difference.
Race Director
Joined: Feb 2004
Posts: 12,518
Likes: 19
here are the specs on the two cams in question...
ZZ4 Cam
(int) 208* (exh) 221* duration @ 050
(int) .474 (exh) .510 lift
lobe seperation 112*
LT4 Hotcam
(int) 218* (exh) 228* duration @ 050
(int) .494 (exh) .494 lift
lobe seperation 112*
Can somebody explain to me (in simple easy to understand language)
what the difference is between these two cams? What do these numbers mean to me as far as performance goes?
Also, does anyone know what the specs are for a stock L98? Just curious to see the difference.
ZZ4 Cam
(int) 208* (exh) 221* duration @ 050
(int) .474 (exh) .510 lift
lobe seperation 112*
LT4 Hotcam
(int) 218* (exh) 228* duration @ 050
(int) .494 (exh) .494 lift
lobe seperation 112*
Can somebody explain to me (in simple easy to understand language)
what the difference is between these two cams? What do these numbers mean to me as far as performance goes?
Also, does anyone know what the specs are for a stock L98? Just curious to see the difference.
Hot Cam-Larger better suited to mid to higher range rpm ranges.
Thread Starter
Burning Brakes
Joined: Aug 2006
Posts: 1,123
Likes: 1
From: Rockland County NY
OK Pete, I understand what you are saying... and I kind of get that the lift is how far the valve opens and duration is basically how long it stays open but, when is too much lift or duration too much? Sorry to drag this on, I'm just trying to understand.
Team Owner
Joined: Oct 2004
Posts: 81,241
Likes: 3,063
From: altered state
St. Jude Donor '05
TPI/long tube runner setups really dont require much cam at all, usually the intake #@.050 in the 2-teens is plenty. Opposite of a typical short runner/carbureted motor.
