Opinions needed. Broke a valve spring. Need a lil help. UPDATE 5/28/16
- Thread starter TomD
- Start date
you don't need a cam of that size or with the ramps it has .. that's a very aggressive cam ..
sounds like a SBC guy spec'd that out
I think you are right.... son of a bitch....
So what's my best option? Get a new cam? Otherwise I'm gonna have to redesign the whole head set up and I'm not even sure the components exist to support the current cam.
Let me act like a younger better looking bison, with a lot less knowledge for a minute. Switching to a 1.55 rocker will relieve the intake spring of .036" and exh spring of .034". Might be cheaper to buy a new cam over buying new rockers. Those iron heads don't flow much after .500", they become very turbulent. The extra lift is just more stress on valve train components and is unnecessary. Looks like an LS cam
Unless you want to keep the rpm down below 5800 and run the 1203 springs you will struggle. That cam is a no no with a stock valve length. Can't feasibly go to a longer valve on the stock heads.
The rocker swap imo isn't enough. It would take rockers and springs. To convert the heads to 1203 with the light retainer would be about $500 itself. Maybe a little more. He'd have to run the springs as tight as possible to get the pressure up and it's still borderline. Also there's too much overlap there unless he plans on running a large hot side which would raise the engines breathing room at high rpm only to be out done by valve train limitation. Yes those lobes are excellent on an LS engine.
The rocker swap imo isn't enough. It would take rockers and springs. To convert the heads to 1203 with the light retainer would be about $500 itself. Maybe a little more. He'd have to run the springs as tight as possible to get the pressure up and it's still borderline. Also there's too much overlap there unless he plans on running a large hot side which would raise the engines breathing room at high rpm only to be out done by valve train limitation. Yes those lobes are excellent on an LS engine.
I wouldn't expect them to replace anything on their dime unless you have some kind of contract
Really ?? That is so not a Turbo 3.8 Grind its not even funny !
IF I went to a shop and gave them my turbo buick and said "SPEC me a cam" and that's what they put in ... I'd be LIVID ! and YES they would replace it on their dime .. that's a BS cam for what he has
I got a billet cam spec'd for my build with old man Nick, but don't tell him I called him that. I believe Bison also has his resources. Anything would be better than what you have, even a 206/206 comp cam roller!
Keep in mind the word expect is just that. Expect. I wouldn't expect them to eat it. I would expect them to correct it but not necessarily eat it. Has anyone received credit on any of the shitty Chinese crap that's on the market that needs hours and hours of work to drop in? If I buy a crank from XYZ vendor and it has tapered journals and flex plate flange is out of spec, and I ask if it will need a lot of metal added to the crank to balance with a .940" pin and they say no and it needs $200 worth of Mallory added to it do they eat that?
$17k?
I
I hear you. I would hope they will do what is reasonably possible. I told them not to treat it like a small block chevy but it looks like that's what I got. I will have a courteous conversation with them and discuss my options.
I hear you. I would hope they will do what is reasonably possible. I told them not to treat it like a small block chevy but it looks like that's what I got. I will have a courteous conversation with them and discuss my options.
If you want a cam that will work drop shipped message me. If overlap is between -12 and -8 at .050" pretty much anything will work for what you're doing. Also plenty of springs that will work on the stuff that is less than .550" lift. One won't really make more or less power than the other. The duration at .050" doesn't really matter. I'd stay away from anything aggressive like 3188, 3190, 3190, and the entire XFI listing. Those lobes can be made to work but it's a lot of special work to get the springs on the heads which adds more cost and the hardware is much more expensive
A small block Chevy with standard length valves will struggle on those lobes also.
Thank you. I know you do this professionally so thanks for taking the time to help me out. I'm gonna give the shop a call tomorrow and discuss this so I may be in touch with you.
Thanks everyone.
Tom
Those lobes would become even more aggressive on a small block Chevy believe it or not due to the lobe master they use for them.
they really missed the boat on this one.you should deal with an engine builder that doesn't need you to tell them how to build a 3.8 v6.thats a lot of paper to drop for this kind of mistake.
