Its not coil bind, its valve seal interference. Thats why you machine the valve guide bosses down on vortec heads. Glad you made it work. Proof in the pudding
Appreciate the video but, there is a lot of info missing. Did you use offset keepers? Grind the bottom of the retainers? Different seals? Stock dimensions won't all for more than maybe .480 lift. So, some things have to change.
the only +.030 keepers I could find (Competition Products), measured out at +.045, NOT + .030! So I had issues with my roller rockers hitting g the keepers still on the intakes…. I’m not able to find anyone that has the + .030 keepers that ACTUALLY are +.030, right now…. Let me know if you find some, and what they measure out to on stock valves. Thanks.
you run a very thin spring from a hardware store or no spring and use your hand to hold the valve up and tight against the valvetrain, and rotate the motor by hand so you can visually see it
I drilled my to 1/2" to be safe, summit 8802 with .525/520 and 1.5 rockers. Ls style beehives, comp retainers and +.050 keepers, fel pro stem seals also
Vortec stock 1.7 more like 1.75, ls beehive 1.8, use comp retainer and +.050 retainers. Had to use dremel with lots of sandpaper rolls to get ls style springs to fit properly (basically almost drop on and pull off with little to no force)
Could be either I have a Edelbrock Performer Rpm 350 crate engine it's built off a ZZ4 Roller Block L31 anyhow they put a Flat Tappet cam in it and I went back with a Hydraulic Roller but he has a Spider (lifter hold down) so it's Roller
longer valves, cut valve pockets, dished retainers, clearanced valve guides. you can get .600 if you want to, i have seen a .725 grind in person that ran. the issue is, vortech heads dont like that much lift and you start losing power fast, specific hieght depends on your casting and port work quality but somewhere between .475-.575 its gonna start losing power fast
Its not coil bind, its valve seal interference. Thats why you machine the valve guide bosses down on vortec heads. Glad you made it work. Proof in the pudding
Exactly… the valve seal is where the problem is.
96 -2002 was the span of the vortec 96&97 retained the mechanical fuel pump mount and shaft opening .
Plan on building a 97 vortex 383 stroker in the next couple of months , first thing I.ll do is check my heads for cracks then order the stroker kit
Appreciate the video but, there is a lot of info missing. Did you use offset keepers? Grind the bottom of the retainers? Different seals?
Stock dimensions won't all for more than maybe .480 lift. So, some things have to change.
You use offset keepers. He’d need .050s to run this much lift. I’m going to be using .030 offset keepers since I’ve only got a 525 lift cam.
the only +.030 keepers I could find (Competition Products), measured out at +.045, NOT + .030! So I had issues with my roller rockers hitting g the keepers still on the intakes…. I’m not able to find anyone that has the + .030 keepers that ACTUALLY are +.030, right now…. Let me know if you find some, and what they measure out to on stock valves. Thanks.
How do you know that the retainer is not hitting the top of the valve seal?
Right tell us that
you run a very thin spring from a hardware store or no spring and use your hand to hold the valve up and tight against the valvetrain, and rotate the motor by hand so you can visually see it
You measure, cut pieces of coat hanger to go/no go lengths measuring with calipers and check with out spring. Piss-cutter did a video showing it
How long are the pushrods you used
Cool. Now I know how big of cam I can go. With the stock spider and dogbone assembly hydraulic roller cam. I upgraded to aftermarket aluminum heads.
Whatever your heads are setup for and allow...
What pushrods are you using and did you have to open the hole for the pushrods to avoid any contact?
I drilled my to 1/2" to be safe, summit 8802 with .525/520 and 1.5 rockers. Ls style beehives, comp retainers and +.050 keepers, fel pro stem seals also
Stock vortec pushrods
Is it the stock Vortec install height in the springs
Vortec stock 1.7 more like 1.75, ls beehive 1.8, use comp retainer and +.050 retainers. Had to use dremel with lots of sandpaper rolls to get ls style springs to fit properly (basically almost drop on and pull off with little to no force)
Inside bosses of spring pockets too tight on my 906
thank you im building a 1997 vortec
What pushrods are you using and is it a flat tapper or roller? If so which ones?
It’s a roller if it’s a 96/02 vortec all day flat tappit stop being used in 95
Could be either I have a Edelbrock Performer Rpm 350 crate engine it's built off a ZZ4 Roller Block L31 anyhow they put a Flat Tappet cam in it and I went back with a Hydraulic Roller but he has a Spider (lifter hold down) so it's Roller
WHAT PUSHRODS # ???
what pushrods and cam are you running please
How much for the projected horsepower ?
Almost enough to pull a hat off your head
You probably used a 50 thou longer valves to make that work i bet?
Are the hydraulic lifters collapsing when you turn it over?
Exactly my thought, if so then it’s an inaccurate reading. Checker springs work well.
What cam are u running
What push rods are you running?
would like to know the same
I know right
Never get .600 out of those heads
longer valves, cut valve pockets, dished retainers, clearanced valve guides. you can get .600 if you want to, i have seen a .725 grind in person that ran. the issue is, vortech heads dont like that much lift and you start losing power fast, specific hieght depends on your casting and port work quality but somewhere between .475-.575 its gonna start losing power fast