That is the factory W31 cam, factory flat top pistons and big valves, way too big. Go mild, just pull the 307 HO factory cam, a nice improvement over a factory smog cam for now.
84 Hurst/Olds New Project
- Thread starter 84clonewars
- Start date
- Status
olds307 and 403 said:
Screw that I don't wanna do this again lol, so I guess the hunt begins for better heads, I found a nos #6 bare and a #6 with w31 valve size for 200$, does that sound like a good deal? Considering the kit comes with springs, retainers, lock etc. I'd just have to have the heads worked and assembled with new big valves. And there is a guy in milwaukee with #5 heads but I dont know what kind of offer to make him for them considering I'd have to get them rebuilt.
Man I don't want to overstep my knowledge with regards to advice as I am no sbo guru. Seek more specifics from someone who is. Both RealOldsPower and Oldspower forums have more of the been there done that crowd with respects to building the sbo and know all the ins outs pros & cons of available Olds parts.
In general I think that sounds like a great even reliable cam with some light to moderately worked big valve heads with peformance valve job. Honest measured calculated compression of 10.0-1 give or take and quench would have to be there to work great and safe with even shitty pump premium and hot weather in stop n go traffic.
You may have to deck the block, mill the heads, or some combination of the two along with piston selection to get the ideal. Its not a place to cut a corner and I am with you on doing it once right the first time with the end in mind. It doesn't mean you have to throw budget out the window but it may mean holding off on some chrome because it ain't cost effective to go back and nobody wants to go threw all this to end up with boreing or at best less than they should have.
If you are working on the heads anyway there is no reason you could not benefit from more lift both in physically fitting and flow. That does not mean you have to go crazy lift or steep ramps and throw reliability out. But even something like finding a rocker that would work properly with your combo and provide more lift by providing say an honest 1.7 ratio instead of the 1.6 they quote. More power without going to more cam and maybe little or no extra cost.
I happen to be a fan of Lunati and or of having a custom cam made if you get air flow numbers to your heads/intake combo as they don't cost much more than box grinds. You might compare this to what you find with Comp. This site is helpful. http://www.kb-silvolite.com/calc.php You will like the compression ratio calculator on top. It simplifies & clarifies it a lot. You learn a lot for understanding parts selection and machine work just by collecting the data to fill in the blanks. Makes it easy to see and sort threw peoples bullshit when you can see measure and understand it yourself.
In general I think that sounds like a great even reliable cam with some light to moderately worked big valve heads with peformance valve job. Honest measured calculated compression of 10.0-1 give or take and quench would have to be there to work great and safe with even shitty pump premium and hot weather in stop n go traffic.
You may have to deck the block, mill the heads, or some combination of the two along with piston selection to get the ideal. Its not a place to cut a corner and I am with you on doing it once right the first time with the end in mind. It doesn't mean you have to throw budget out the window but it may mean holding off on some chrome because it ain't cost effective to go back and nobody wants to go threw all this to end up with boreing or at best less than they should have.
If you are working on the heads anyway there is no reason you could not benefit from more lift both in physically fitting and flow. That does not mean you have to go crazy lift or steep ramps and throw reliability out. But even something like finding a rocker that would work properly with your combo and provide more lift by providing say an honest 1.7 ratio instead of the 1.6 they quote. More power without going to more cam and maybe little or no extra cost.
I happen to be a fan of Lunati and or of having a custom cam made if you get air flow numbers to your heads/intake combo as they don't cost much more than box grinds. You might compare this to what you find with Comp. This site is helpful. http://www.kb-silvolite.com/calc.php You will like the compression ratio calculator on top. It simplifies & clarifies it a lot. You learn a lot for understanding parts selection and machine work just by collecting the data to fill in the blanks. Makes it easy to see and sort threw peoples bullshit when you can see measure and understand it yourself.
Thanks Vern, thanks to you my head just exploded and now I have to clean my van, do you have any idea how bad brain matter smells??? That website destroyed my whole view on what I thought I knew you are an EVIL man (sarcasm alert). Thanks man Imm gonna call a few engine shops, I just hate to have a fresher block have to get machine work done to it, as far as the heads go if I get the valve springs atleast I can change those myself. If that means I need to go with a smaller cam that's fine it will be much stronger than the motor that was in my regal(which I'm sure the owner before me just put older heads on the 75 block). Time is also a factor I need this swap completed by the second Sunday in february.
After several talks with people with tons more knowledge than I have, I was pointed towards this kit that will not need different heads or pistons, so basically I can do the work myself and have y car running in two weeks.
http://www.summitracing.com/parts/CCA-K42-222-4/
Hopefully it will all work out and I will be a happy ****.
http://www.summitracing.com/parts/CCA-K42-222-4/
Hopefully it will all work out and I will be a happy ****.
Cool. That will solve the two week problem.
When you have your grey matter back together and the time & aptitude read anything by David Visard and here is another good link http://victorylibrary.com/mopar/mopar-tech.htm
http://www.wallaceracing.com/Calculators.htm
When you have your grey matter back together and the time & aptitude read anything by David Visard and here is another good link http://victorylibrary.com/mopar/mopar-tech.htm
http://www.wallaceracing.com/Calculators.htm
Thanks Vern,
Im about to press order now, summit has taken a lot of my $$$ this week lol, brains are back inside my cranium gonna check out that site soon
Im about to press order now, summit has taken a lot of my $$$ this week lol, brains are back inside my cranium gonna check out that site soon
With #8 heads with any dish piston, even the 6 cc, you will lucky to have to have 8.5 to 1. My 403 is around that, my compression is 135-150 with a 204-214 cam. My engine might be low due to engine over heating, but why risk it? Go one size smaller unless you add early heads.
olds307 and 403 said:
I'm working on a few guys for earlier heads as we speak but I am still gonna order that cam as it should :? work for me as is for right now. If I fall on my face I'll just have to deal with that I guess.
- Status
Similar threads
