Mechanical or electric
Thread Starter
Racer
Joined: Sep 2007
Posts: 253
Likes: 0
From: Pearlington Mississippi
Mechanical or electric
Hello, I need some technical info.
I have a 2000 vortec motor, #10243880
Mortec say's: 350 ,95-00, 2 OR 4 Bolt main,Vortec truck,Gen-1 crate motors and zz4,roller cam,one piece rear seal.whew
So my questions are:
1: do i have a roller cam.
2: If i replace it,(looking for the lope of say a comp 268H),What cam should i use without having to mod anything,ie: grinding milling etc..
3:I was told there is no provision for a mech.pump.That there is no cam lobe to push a mech pump rod.yet there is a mech.opening.
I would like to use a mech.pump if possible,can I?
4: and lastly with my setup,can someone guess at the HP?
( holly 670,edelbock performer,of course vortec heads,stock exhaust),and what change in HP the cam/Headers will make?
wow,that's alot...I appreciate any info,I'm just trying to decide what direction i want to go.
I have a 2000 vortec motor, #10243880
Mortec say's: 350 ,95-00, 2 OR 4 Bolt main,Vortec truck,Gen-1 crate motors and zz4,roller cam,one piece rear seal.whew
So my questions are:
1: do i have a roller cam.
2: If i replace it,(looking for the lope of say a comp 268H),What cam should i use without having to mod anything,ie: grinding milling etc..
3:I was told there is no provision for a mech.pump.That there is no cam lobe to push a mech pump rod.yet there is a mech.opening.
I would like to use a mech.pump if possible,can I?
4: and lastly with my setup,can someone guess at the HP?
( holly 670,edelbock performer,of course vortec heads,stock exhaust),and what change in HP the cam/Headers will make?
wow,that's alot...I appreciate any info,I'm just trying to decide what direction i want to go.
Instructor
Joined: Sep 2006
Posts: 142
Likes: 1
Many late model blocks still have provisions for old technology like mech fuel pumps and distributer. They are just blocked off by a metal plate. I guess it makes it easier in production..?
If it is topped of with a carb then just make sure the cam has a fuel lobe and also get a fuel pump rod and mech fuel pump. However, if it is going to be Fuel injected a mechanical pump won't hold the pressure that an electric will so a Fuel injection system won't function properly.
As for the cam, if it will be a street motor I would say stay in the 230s of duration @ .050 lift to keep it street friendly but still give a bit of lope. Remember the more the duration the more the lopey idle but also the rougher the idle and the higher in the powerband all the power will be. Great for a track where you red line it, but terrible for a motor on the street that rarely sees above say... 4k or so RPM.
If it is a 2000 year model vortec engine that there is a 99.9% chance it is roller. (good base to start with)
If it is topped of with a carb then just make sure the cam has a fuel lobe and also get a fuel pump rod and mech fuel pump. However, if it is going to be Fuel injected a mechanical pump won't hold the pressure that an electric will so a Fuel injection system won't function properly.
As for the cam, if it will be a street motor I would say stay in the 230s of duration @ .050 lift to keep it street friendly but still give a bit of lope. Remember the more the duration the more the lopey idle but also the rougher the idle and the higher in the powerband all the power will be. Great for a track where you red line it, but terrible for a motor on the street that rarely sees above say... 4k or so RPM.
If it is a 2000 year model vortec engine that there is a 99.9% chance it is roller. (good base to start with)
Team Owner
Joined: Aug 2006
Posts: 24,125
Likes: 15
From: Columbia Missouri
Hello, I need some technical info.
I have a 2000 vortec motor, #10243880
Mortec say's: 350 ,95-00, 2 OR 4 Bolt main,Vortec truck,Gen-1 crate motors and zz4,roller cam,one piece rear seal.whew
So my questions are:
1: do i have a roller cam.
2: If i replace it,(looking for the lope of say a comp 268H),What cam should i use without having to mod anything,ie: grinding milling etc..
3:I was told there is no provision for a mech.pump.That there is no cam lobe to push a mech pump rod.yet there is a mech.opening.
I would like to use a mech.pump if possible,can I?
4: and lastly with my setup,can someone guess at the HP?
( holly 670,edelbock performer,of course vortec heads,stock exhaust),and what change in HP the cam/Headers will make?
wow,that's alot...I appreciate any info,I'm just trying to decide what direction i want to go.
I have a 2000 vortec motor, #10243880
Mortec say's: 350 ,95-00, 2 OR 4 Bolt main,Vortec truck,Gen-1 crate motors and zz4,roller cam,one piece rear seal.whew
So my questions are:
1: do i have a roller cam.
2: If i replace it,(looking for the lope of say a comp 268H),What cam should i use without having to mod anything,ie: grinding milling etc..
3:I was told there is no provision for a mech.pump.That there is no cam lobe to push a mech pump rod.yet there is a mech.opening.
I would like to use a mech.pump if possible,can I?
4: and lastly with my setup,can someone guess at the HP?
( holly 670,edelbock performer,of course vortec heads,stock exhaust),and what change in HP the cam/Headers will make?
wow,that's alot...I appreciate any info,I'm just trying to decide what direction i want to go.
Yes, you have a factory roller cam.
You can get a marine application cam for that motor, that will increase performance and won't break the bank or require changes to anything else.
Some of the Vortec engines do have the mechanical pump port bored, but some do not. Just look. If you can see the cam, you can use a mechanical pump and you just have to get a cam that has the lobe. If you can't see the cam, and it's just a dead end cast, then no, you have to use electric.
Hard to say, but with a Vortec engine, with stock rods and pistons and stock gasket thickness, you'll be looking at around 300 - 325 HP.
Racer
Joined: Nov 2007
Posts: 350
Likes: 0
From: coon rapids mn
yes it is a roller you have to be careful of valve lift with the vortec heads dont remember max lift for the heads iam sure someone on here will chime in but a very good choice for a cam is a gmpp zz4 cam with your set up 350 plus hp and 400 torque should be expected very good combo easily get 13 second time slips if you wanted the only concern would be the lift but i believe comp cams sell a spring and retainer kit that will increase the lift with no machining not sure of part # you also going to need a melenized gear for the dizzy and a roller compatible fuel pump rod no biggy on either one oh you can pick up a zz4 cam on ebay cheap 75$ use all the stock valve train except spring and retainers as mentioned above
Burning Brakes
Joined: Sep 2005
Posts: 832
Likes: 0
From: Sarasota Florida
Hello, I need some technical info.
I have a 2000 vortec motor, #10243880
Mortec say's: 350 ,95-00, 2 OR 4 Bolt main,Vortec truck,Gen-1 crate motors and zz4,roller cam,one piece rear seal.whew
So my questions are:
1: do i have a roller cam.
2: If i replace it,(looking for the lope of say a comp 268H),What cam should i use without having to mod anything,ie: grinding milling etc..
3:I was told there is no provision for a mech.pump.That there is no cam lobe to push a mech pump rod.yet there is a mech.opening.
I would like to use a mech.pump if possible,can I?
4: and lastly with my setup,can someone guess at the HP?
( holly 670,edelbock performer,of course vortec heads,stock exhaust),and what change in HP the cam/Headers will make?
wow,that's alot...I appreciate any info,I'm just trying to decide what direction i want to go.
I have a 2000 vortec motor, #10243880
Mortec say's: 350 ,95-00, 2 OR 4 Bolt main,Vortec truck,Gen-1 crate motors and zz4,roller cam,one piece rear seal.whew
So my questions are:
1: do i have a roller cam.
2: If i replace it,(looking for the lope of say a comp 268H),What cam should i use without having to mod anything,ie: grinding milling etc..
3:I was told there is no provision for a mech.pump.That there is no cam lobe to push a mech pump rod.yet there is a mech.opening.
I would like to use a mech.pump if possible,can I?
4: and lastly with my setup,can someone guess at the HP?
( holly 670,edelbock performer,of course vortec heads,stock exhaust),and what change in HP the cam/Headers will make?
wow,that's alot...I appreciate any info,I'm just trying to decide what direction i want to go.
Thread Starter
Racer
Joined: Sep 2007
Posts: 253
Likes: 0
From: Pearlington Mississippi
Thank's for all the replies 
I currently am very satisfied with it,but i will be adding a cam and some hooker super comps.
I am using an electric pump now,with the manual opening blocked off.
I guess i can use a mirror to peer into it, or maybe see inside it from below? Thats why i luv this forum,someone will know.
I currently am very satisfied with it,but i will be adding a cam and some hooker super comps.I am using an electric pump now,with the manual opening blocked off.
I guess i can use a mirror to peer into it, or maybe see inside it from below? Thats why i luv this forum,someone will know.
Instructor
Joined: Sep 2006
Posts: 142
Likes: 1
I just got done researching and buying a set of vortec heads. The factory lift seems to be .475 ( although I've heard some say only .450)
The ones I bought, however, were upgraded with lt4 springs so it's capable of up to .600 now
The ones I bought, however, were upgraded with lt4 springs so it's capable of up to .600 now
