New valve springs.
Thread Starter
Team Owner
Joined: Aug 2006
Posts: 24,125
Likes: 15
From: Columbia Missouri
New valve springs.
I think I've finally tracked down the right set of springs for my application.
The refresh: 1973 SBC 405, roller retrofit, ZZ4 Hot Cam, 1.5" roller rockers, 14102193 '89 350 heads.
Here's a link to the springs.
http://www.gmpartsdirect.com/results...umber=10134358
Do these look appropriate? Also, it says package quantity is 2 per, so does that mean I order 8? Giving me 16? Sounds good at that price.
Yes, I'll be getting the proper retainers.
The refresh: 1973 SBC 405, roller retrofit, ZZ4 Hot Cam, 1.5" roller rockers, 14102193 '89 350 heads.
Here's a link to the springs.
http://www.gmpartsdirect.com/results...umber=10134358
Do these look appropriate? Also, it says package quantity is 2 per, so does that mean I order 8? Giving me 16? Sounds good at that price.
Yes, I'll be getting the proper retainers.
Thread Starter
Team Owner
Joined: Aug 2006
Posts: 24,125
Likes: 15
From: Columbia Missouri
I'll measure later this morning and post back.
I got that part number off a sheet out of a GM parts catalog. The GM parts guy knew nothing about what springs I could put on these heads, so he printed the sheet for me to take to my machinist. He looked over the list, knowing that I have stock '89 heads, and a roller LT4 Hot Cam. He picked these springs.
Team Owner
Joined: Apr 1999
Posts: 21,953
Likes: 1,445
From: Reno Nevada
2024 C3 of the Year Finalist- Modified
I think that it's time to go to real head machine shop!
Junk low lift 110# seat and sub .500 lift spring are not what you install on a H-roller cam. It says solid at 1.16 from 1.70 installed is .540 lift to coil bind. You don't want to really run much less than .100 from coil bind.
So those springs were made for very low duration stock cams with mid .400 lifts
Junk low lift 110# seat and sub .500 lift spring are not what you install on a H-roller cam. It says solid at 1.16 from 1.70 installed is .540 lift to coil bind. You don't want to really run much less than .100 from coil bind.
So those springs were made for very low duration stock cams with mid .400 lifts
Le Mans Master
Joined: Apr 2006
Posts: 5,403
Likes: 95
I'll measure later this morning and post back.
I got that part number off a sheet out of a GM parts catalog. The GM parts guy knew nothing about what springs I could put on these heads, so he printed the sheet for me to take to my machinist. He looked over the list, knowing that I have stock '89 heads, and a roller LT4 Hot Cam. He picked these springs.
I got that part number off a sheet out of a GM parts catalog. The GM parts guy knew nothing about what springs I could put on these heads, so he printed the sheet for me to take to my machinist. He looked over the list, knowing that I have stock '89 heads, and a roller LT4 Hot Cam. He picked these springs.
moderate hydraulic rollers they require more closed and open
pressure. find a spring with 140 at installed height for your ZZ4
cam.
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Thread Starter
Team Owner
Joined: Aug 2006
Posts: 24,125
Likes: 15
From: Columbia Missouri
When I was building it I was spending a lot of time on ThirdGen.org. I told them I was looking for a good roller cam for this 405. Keep in mind this is almost three years ago, and I knew nothing of roller cams...I still don't really. anyway, several people all suggested and agreed they thought the LT4 Hot Cam would work good for me. I found out not long ago that it wasn't the best of choices...problem is I already ordered it, and I don't want to waste the money. I tried selling it, but would never get anything out of it.
Melting Slicks
Joined: Feb 2006
Posts: 2,209
Likes: 0
From: Mo
Well I understand not wanting to loose money,but I would lay odds after driving it for a 6 months ,you will be changing it.
mite try selling it on LS1 tech or Camaroz28,LT1 guys like that cam for a cam upgrade.
mite try selling it on LS1 tech or Camaroz28,LT1 guys like that cam for a cam upgrade.
Thread Starter
Team Owner
Joined: Aug 2006
Posts: 24,125
Likes: 15
From: Columbia Missouri
I'd be up to that at this point, 6 months early I guess...but no one has been able to suggest a good known cam. I would prefer one that has a name, that I could easily search for and maybe even find a good deal on on Ebay.
Burning Brakes
Joined: Sep 2006
Posts: 1,071
Likes: 86
From: Rotonda FL
Try Crane #99845-16. These are 1.255 diameter to fit stock spring pocket. They are premium H-11 steel, install at 1.750 (.050 greater than stock) and have 124# seat. They will bind at 1.100" and have an open pressure of 374# at 1.150. They are pricey but you can use stock GM retainers (to save a little $) with +.050 keepers to achieve the 1.750 installed height. They are designed to accomodate roller hyd lifters.
PS. These are single springs which will fit over the stock vortec inner spring bosses and in the stock vortec pocket. Using the above springs/keepers will allow the use of approx .500 lift cams on unmodified vortec heads. Vortec flow flattens out at .500' so this is as good as it gets with them. Sorry for the digression!
PS. These are single springs which will fit over the stock vortec inner spring bosses and in the stock vortec pocket. Using the above springs/keepers will allow the use of approx .500 lift cams on unmodified vortec heads. Vortec flow flattens out at .500' so this is as good as it gets with them. Sorry for the digression!
Thread Starter
Team Owner
Joined: Aug 2006
Posts: 24,125
Likes: 15
From: Columbia Missouri
Try Crane #99845-16. These are 1.255 diameter to fit stock spring pocket. They are premium H-11 steel, install at 1.750 (.050 greater than stock) and have 124# seat. They will bind at 1.100" and have an open pressure of 374# at 1.150. They are pricey but you can use stock GM retainers (to save a little $) with +.050 keepers to achieve the 1.750 installed height. They are designed to accomodate roller hyd lifters.
PS. These are single springs which will fit over the stock vortec inner spring bosses and in the stock vortec pocket. Using the above springs/keepers will allow the use of approx .500 lift cams on unmodified vortec heads. Vortec flow flattens out at .500' so this is as good as it gets with them. Sorry for the digression!
PS. These are single springs which will fit over the stock vortec inner spring bosses and in the stock vortec pocket. Using the above springs/keepers will allow the use of approx .500 lift cams on unmodified vortec heads. Vortec flow flattens out at .500' so this is as good as it gets with them. Sorry for the digression!
Thanks for the suggestions, and I'll look into those. Will they work on my '89 heads even though they are not Vortec heads?
Melting Slicks
Joined: Feb 2006
Posts: 2,209
Likes: 0
From: Mo
What do you want the cam to do,tq monster or hp maker.
what kind of a powerband.
Do you want an aggresive cam.
Thread Starter
Team Owner
Joined: Aug 2006
Posts: 24,125
Likes: 15
From: Columbia Missouri
Le Mans Master
Joined: Oct 2005
Posts: 9,429
Likes: 44
From: Macon, GA
When I was building it I was spending a lot of time on ThirdGen.org. I told them I was looking for a good roller cam for this 405. Keep in mind this is almost three years ago, and I knew nothing of roller cams...I still don't really. anyway, several people all suggested and agreed they thought the LT4 Hot Cam would work good for me. I found out not long ago that it wasn't the best of choices...problem is I already ordered it, and I don't want to waste the money. I tried selling it, but would never get anything out of it.
Thread Starter
Team Owner
Joined: Aug 2006
Posts: 24,125
Likes: 15
From: Columbia Missouri
Sure I'd sell it if you can use it. PM me and make an offer. I'll need a bunch of suggestions for new cams...cheap, and why they would work for my low RPM torque monster 405.
Le Mans Master
Joined: Oct 2005
Posts: 9,429
Likes: 44
From: Macon, GA
I'll get with you on the hot cam later. I think you should focus on duration and LSA figures instead of lift if your going for massive torque. You may have already seen this, but here's a great link:
http://www.chevyhiperformance.com/te...iables_basics/
http://www.chevyhiperformance.com/te...iables_basics/
Thread Starter
Team Owner
Joined: Aug 2006
Posts: 24,125
Likes: 15
From: Columbia Missouri
I'll get with you on the hot cam later. I think you should focus on duration and LSA figures instead of lift if your going for massive torque. You may have already seen this, but here's a great link:
http://www.chevyhiperformance.com/te...iables_basics/
http://www.chevyhiperformance.com/te...iables_basics/
Thanks for that link. I've had a few threads touching on this cam issue, and how the Hot Cam is too mild for my engine...but everyone assumes I am building a 5000 RPM race motor when they suggest cams. I don't know much at all about roller cams and springs...and I need to decide fast.