Vaccum ?????
Thread Starter
11 Second Club
iTrader: (6)
Joined: Dec 2003
Posts: 973
Likes: 1
From: Houston (The Champions)
Vaccum ????? I have a 408 with a crazy cam . When you pull off the oil fill cap, will there be a vaccum? If so what causes the vaccum??? I pull off my cap, and get a huge vaccum.. Thanks guys...
Originally Posted by charlie c5
I have a 408 with a crazy cam . When you pull off the oil fill cap, will there be a vaccum? If so what causes the vaccum??? I pull off my cap, and get a huge vaccum.. Thanks guys...
TECH Enthusiast
Joined: Jul 2006
Posts: 638
Likes: 0
From: San Diego
Originally Posted by charlie c5
I have a 408 with a crazy cam . When you pull off the oil fill cap, will there be a vaccum? If so what causes the vaccum??? I pull off my cap, and get a huge vaccum.. Thanks guys...
Thread Starter
11 Second Club
iTrader: (6)
Joined: Dec 2003
Posts: 973
Likes: 1
From: Houston (The Champions)
Well, I don't have a vaccum pump. I do have a huge vaccum at the oil fill neck, even when I take off both the intake and the throttle body vaccum lines. Now that's not good, huh??? Any ideas...
TECH Enthusiast
Joined: Jul 2006
Posts: 638
Likes: 0
From: San Diego
Originally Posted by charlie c5
Well, I don't have a vaccum pump. I do have a huge vaccum at the oil fill neck, even when I take off both the intake and the throttle body vaccum lines. Now that's not good, huh??? Any ideas...
Trending Topics
LS1 Tech Stories
The Best V8 Stories One Small Block at Time
6 Common C5 Corvette Failures and What's Involved In Repairing Them
Pouria Savadkouei
Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph
Verdad Gallardo
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked
Pouria Savadkouei
Top 10 Most Powerful Chevy Trucks Ever Made!
Hennessey's New Supercharged Silverado ZR2 Has 700 HP
Verdad Gallardo
Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes
Verdad Gallardo
Awesome K5 Blazer Restomod Comes With C7 Corvette Power
Verdad Gallardo
10 Camaros You Should Never Buy
10 LS Engine Myths That Refuse to Die
Verdad Gallardo Thread Starter
11 Second Club
iTrader: (6)
Joined: Dec 2003
Posts: 973
Likes: 1
From: Houston (The Champions)
I pulled off the driver's side valve cover. Yes, well, I found our little problem... #7 cylinder rocker pedistol is broken. I can't believe it. I'll call Texas Speed on Wednesday. I'm sure Jason, and Jon will take care of me.. I'll let you guys know how it goes. The motor, heads rear-end and tranny only have 5 miles on it.
wonder how in the world that happened? any chance a valve hit a piston? is it striped out, or the stand is as you said broken? get some pics just cause Id like to see them. hopefully we can figure out why that happened.
The heads was over ported and the stress and the harmonics from the valve spring caused it to crack and finally break off. The same that happed to a buddy of mine not to long ago
Thread Starter
11 Second Club
iTrader: (6)
Joined: Dec 2003
Posts: 973
Likes: 1
From: Houston (The Champions)
I am planning on spraying a 500 progressive on a direct port. Not impossable at all. I have set this same set-up up many times... Yes, the stand itself broke. I had the thought of maybe over porting, or the push rods may be too long, or the cam too big. But I spent 8 months planning this set-up. I made sure all of the builders and designers knew what was going on. I know how good communication is key. My thought is I hope this doesn't happen to the other head. I'll call Texas Speed Tuesday. I knnow they'll take care of me. They do have great customer service...
Launching!
Joined: Apr 2005
Posts: 205
Likes: 1
From: Atlanta area, GA
Originally Posted by charlie c5
I am planning on spraying a 500 progressive on a direct port. Not impossable at all. I have set this same set-up up many times... Yes, the stand itself broke. I had the thought of maybe over porting, or the push rods may be too long, or the cam too big. But I spent 8 months planning this set-up. I made sure all of the builders and designers knew what was going on. I know how good communication is key. My thought is I hope this doesn't happen to the other head. I'll call Texas Speed Tuesday. I knnow they'll take care of me. They do have great customer service...
Yikes, glad you found the issue.. Was this the side w/ the screwy LTFT's?? Seems like it took a while for it to break, as it ran o.k. for a bit.
I'd be concerned about this combo, you don't want the motor to grenade at high RPM's..
damn, that is scary. glad I didnt raise the roof on my ports, as I'll be using the new super springs and LSK int. lobe too. are they sending you a new head? what happened to the pushrod? was it still sitting on the lifter?
what is the thickness of the port walls where it broke? could you measure this and put that in this thread so others know to avoid goin to that much material removal? Im goin to measure the thickness of my port walls in those areas if I can get to it somehow. all you need is a mic. or dial calipers since its right there opened up.
how high have you reved the engine so far? wonder when it happened. and what about the other side?
what is the thickness of the port walls where it broke? could you measure this and put that in this thread so others know to avoid goin to that much material removal? Im goin to measure the thickness of my port walls in those areas if I can get to it somehow. all you need is a mic. or dial calipers since its right there opened up.
how high have you reved the engine so far? wonder when it happened. and what about the other side?
Thread Starter
11 Second Club
iTrader: (6)
Joined: Dec 2003
Posts: 973
Likes: 1
From: Houston (The Champions)
I have both valve covers off, and the driver's side is the only broken one. My issue is this happened with only 5 miles on the motor. I was still in the break-in mode. I haven't even thought about the 500 shot yet. I could imagine being at the top of the 1/4 @ 7500 RPMs on a 500 shot. That would suck. Dan Smallwood, yes this the srewy side. I'll be calling Texas Speed this morning. I know they'll take care of me... They want good publicity in GM High Tech and Corvette Fever Maagazines. I'm just worried about the other head.. If this one is thin, what about the other??..