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Author
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Topic: 289 cam how big can I go?
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mustangboy
Gearhead Posts: 1098
From: Ont, Canada
Registered: Mar 2002
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posted 06-03-2005 11:18 PM
  
How big can I go before I need screw in studs?Also how much spring pressure.
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steve'66
Gearhead Posts: 9489
From: Sonoma,CA,USA
Registered: Mar 2000
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posted 06-03-2005 11:29 PM
Not much over stock.Maybe a 268 or so advertised Comp cam but even then you should pin the pressed in studs. SteveW
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mizry
Journeyman Posts: 67
From: ca
Registered: Sep 2004
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posted 06-04-2005 12:20 AM
I wouldnt use anything but stock springs with the pressed in studs...................
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Poes Fords
Journeyman Posts: 92
From: Medford, OR USA
Registered: Oct 2004
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posted 06-04-2005 03:38 AM
Not a recommendation.........just experience. I have a 270 comp hydraulic unit with stock springs, and press in studs. I guess I live life on the edge, and I was really bored one night. I did this in a pretty wore out motor though, so not a lot to lose. It really woke my 302 up. It's survived a couple of nights out at the drags, and driving me back and forth to work. Probably have 5-6,000 miles, and still going. Maybe luck? Jason
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mustangboy
Gearhead Posts: 1098
From: Ont, Canada
Registered: Mar 2002
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posted 06-04-2005 07:50 AM
My local machine shop is recommending a [email protected] degree cam with 454 lift and 110 degree lobe seperation.I have some springs that came on the engine in my sig that I never used.They are 70lbs seated and 220 open at .500 lift.Not all that strong but they look huge compared to the original 1966 two barrel stockers...I was trying to find an old post on here about pinning the studs but couldn't find it.If I remember correctly it wasn't too popular of an idea but I forget why?Maybe the screw in studs are just as cheap?------------------
1968 mustang j-code sprint.13.69@101 306cu.in, stock ported heads,weiand exellerator,650 holley DP,hedman hedders,comp 292 Magnum cam,4-speed,8 inch 4.11 detroit locker http://mustangsandmore.50megs.com/MembersPics/mustangboy.html
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68F100
Gearhead Posts: 2609
From: Burlington, Iowa
Registered: Oct 99
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posted 06-04-2005 11:04 AM
My machine shop is gonna machine my heads for screw in studs for about $20. Not too bad I think.
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mustangboy
Gearhead Posts: 1098
From: Ont, Canada
Registered: Mar 2002
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posted 06-04-2005 09:54 PM
Well everything seems like its triple the price here in Canada when it comes to high performance parts.It is $100 bucks minimum just to machine for studs.Then I have to buy the studs on top of that.------------------
1968 mustang j-code sprint.13.69@101 306cu.in, stock ported heads,weiand exellerator,650 holley DP,hedman hedders,comp 292 Magnum cam,4-speed,8 inch 4.11 detroit locker http://mustangsandmore.50megs.com/MembersPics/mustangboy.html
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steve'66
Gearhead Posts: 9489
From: Sonoma,CA,USA
Registered: Mar 2000
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posted 06-04-2005 10:36 PM
You can drill through the casting and into the studs, then drive roll pins in for less $$. The downside is the stud will be a little weaker with the hole in it. There has to be some pics of this procedure on the web somewhere.SteveW
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Steve68Cougar
Journeyman Posts: 23
From: Galva, KS, USA
Registered: Jun 2005
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posted 06-04-2005 11:34 PM
I've been lurking for a while and finally decided to register and post when I saw this topic. It hits pretty close to home. I built a 289 for my Cougar in about 1990 and used the stock heads with pressed in studs. I used a Comp Cam 268H. I kept the stock springs in it and they were still working when I pulled the heads off 30k miles later (car ran 15.2's in this configuration). I did a head upgrade to '69 351W heads and did everything as cheaply as possible (college budget). I even used the stock head bolts from the 289 to bolt them down (water passage dowels kept everything centered). I left the stock necked-down press-in studs in it and made them adjustable with a Comp Cams kit. To top it off, I used stiffer than stock valve springs that were spec'd out for the 260H cam. A knowledgeable friend recommended using them because they were stiffer than the stock ones, but were still soft enough as to (hopefully) not cause the studs to back out. After 25k miles and about 30 passes down the dragstrip, everything is still working. Other than the initial valve adjustment, I've never had to adjust the valves. I think part of the trick to the longevity is that the rev limiter is set at 6k rpm. If I went any bigger with the camshaft, it would only be a step up to a 270H. Anything bigger than that and I'd want to convert to screw-in studs (I'd strongly consider it even with that cam). The 268H has worked pretty well for me, but I think a 270H would work OK, too. It would be right on the edge, though. My engine has been abused from day one (throttle stuck wide open with 7 miles on it) and has never missed a beat. When I get the clutch replaced and suspension sorted out I hope to run a low 14 or high 13 with it (last time out was 3 years ago - a 14.56@94 with a DA of 5500ft). I may just be lucky, but it's worked for me.
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steve'66
Gearhead Posts: 9489
From: Sonoma,CA,USA
Registered: Mar 2000
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posted 06-05-2005 11:18 AM
Welcome to M&M Steve!!  Thanks for your input. SteveW
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Steve68Cougar
Journeyman Posts: 23
From: Galva, KS, USA
Registered: Jun 2005
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posted 06-06-2005 09:15 PM
Thanks! I enjoy browsing through this site because of the knowledgeable people and lack of flame-throwing. Besides, a bunch of Stock and Super Stock racers that (mostly) drive Fords can't be too bad. 
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steve'66
Gearhead Posts: 9489
From: Sonoma,CA,USA
Registered: Mar 2000
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posted 06-06-2005 09:44 PM
Relax and make yourself at home. We are a good bunch of car nuts here. SteveW
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TurboGT
Gearhead Posts: 264
From: Hutchinson, Kansas
Registered: Mar 2002
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posted 06-09-2005 09:31 AM
Welcome, crewchief Steve!  Short version of my Steve68Cougar story:
He has spent countless hours helping me with my projects. In fact, my guess that he's probably spent more time on my stuff over the past few years than he has his own! With his vast Ford experience, he'll be a great asset to M&M. As for the question about press-in studs go, I'd have to echo the other responses. Much over stock pressure springs and 270 degrees advertised duration is asking for trouble. If you plan to run the 268H or 270H Comp Cam, there's performance to be had by pinning the studs and bumping the spring pressure from stock. There are screw-in studs on the market that don't require guide plates, or machining for the guide plates. All you have to do is tap the hole that the press-in stud was in. I don't recall who made them, but I used them for some 289 heads I had a few years back. Maybe someone will chime in with the info. ------------------
Mark Walton
'83 Mustang GT 2.3 Turbo NHRA Stocker - it's alive!
'69 "off brand" NHRA SS/EA [This message has been edited by TurboGT (edited 06-09-2005).]
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mustangboy
Gearhead Posts: 1098
From: Ont, Canada
Registered: Mar 2002
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posted 06-09-2005 11:17 PM
I am running the cam that I posted earlier which is very similiar in specs to the 260H.I'm still not sure on valve springs but the machine shop insists it will be ok with the springs that I have(70 lbs seated 220@ 500 lift).I'm going to run the comp cams magnum tipped rocker with the rail style tip to align the rocker so I won't need guide plates.Arp studs were going to cost me around $180 bucks with tax and then its roughly $100 bucks for the machine work.Unfortunately its just not in the budget.I've already sunk $18,000 into this thing and still counting.  ------------------
1968 mustang j-code sprint.13.69@101 306cu.in, stock ported heads,weiand exellerator,650 holley DP,hedman hedders,comp 292 Magnum cam,4-speed,8 inch 4.11 detroit locker http://mustangsandmore.50megs.com/MembersPics/mustangboy.html
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68 Coop
Gearhead Posts: 2911
From: Mesquite, NV. 89027 M&M# 4256
Registered: Oct 2004
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posted 06-10-2005 12:31 AM
Drool! That 68 is well worth the money. You could be driving a new aluminum can car for about twice that, but it just wouldn't be as  or baddazz.------------------
William
68 Coupe
"Restomod in Progress"
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mustangboy
Gearhead Posts: 1098
From: Ont, Canada
Registered: Mar 2002
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posted 06-12-2005 11:22 AM
Thanks for the compliment 68 Coop but the car I'm referring to is the 66 coupe at the end of my pictures section not my 68.It's been at a bodyshop for 2 1/2 years and I'm just getting it back(they were very slow).Once I get it a little more completed I'll try to get some pics posted .------------------
1968 mustang j-code sprint.13.69@101 306cu.in, stock ported heads,weiand exellerator,650 holley DP,hedman hedders,comp 292 Magnum cam,4-speed,8 inch 4.11 detroit locker http://mustangsandmore.50megs.com/MembersPics/mustangboy.html
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Steve68Cougar
Journeyman Posts: 23
From: Galva, KS, USA
Registered: Jun 2005
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posted 06-13-2005 06:17 PM
Thanks for your kind words, Mark. I enjoy helping you spend your money If I was to do it over again, I would probably go the route of tapping the holes and using the studs that Mark mentioned (I'd like to know who makes them, too). I may go that route sometime so I can get a little more radical with the cam. ------------------
68Cougar - 289, 4-speed
98 Mustang Cobra convertible - stock - does everything better than the Cougar except bring a smile to my face.
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