Cam suggestions? - Vintage Mustang Forums
 10Likes
Reply
 
Thread Tools
post #1 of 16 (permalink) Old 07-02-2019, 12:03 PM Thread Starter
Senior Member
 
DaleB's Avatar
 
Join Date: Feb 2019
Location: Omaha, NE
Posts: 182
Garage
Cam suggestions?

1966 289, C4, 2.80 rear end. The engine is a stock '66 block. Seven bores are within .003 of new, but one is worn about .006 or so with .004 taper. I don't think a simple hone & re-ring is a good idea, but feel free to disagree if you want (it would save me close to $500 in machine work and pistons). If I have to pay the $300 or so to bore & hone, I'll just go .030 over.

Flat top pistons (or? The originals are slightly dished...)
Either stock GT40P heads - close to 9:1 or 9.5:1 compression
Stock cast iron exhaust manifolds
Either stock 4V or maybe something like an Edelbrock Performer street intake (not selected yet)
4V carb (likely a 4100), not selected yet

I could re-use the original heads, but I have read that the GT40P heads would breathe better. It would probably be as expensive to use the old heads as to replace them, since the tops of the valves are grooved and worn from the rockers.
Not looking to spend a fortune on machining them.

Nothing wild. Not a race car. With those gears I'm looking for good low and midrange torque. It doesn't need a silky smooth idle, I want it to sound good but not lope and spew half-burned gas. There are thousands of cams out there, and I'm not an expert. What say ye, assembled experts?
DaleB is offline  
Sponsored Links
Advertisement
 
post #2 of 16 (permalink) Old 07-02-2019, 12:11 PM
Senior Member
 
Join Date: Jul 2013
Posts: 4,157
1ofAMillion+ is online now  
post #3 of 16 (permalink) Old 07-02-2019, 12:23 PM Thread Starter
Senior Member
 
DaleB's Avatar
 
Join Date: Feb 2019
Location: Omaha, NE
Posts: 182
Garage
Yeah... I saw that, and I'm guessing that cam would probably not be a good choice for me, considering it's a completely different engine, different gears, exhaust, heads, and different requirements.
DaleB is offline  
 
post #4 of 16 (permalink) Old 07-02-2019, 12:55 PM
Senior Member
 
Grimbrand's Avatar
 
Join Date: Jan 2019
Location: Sedgwick, Kansas
Posts: 643
lol Right you are, Dale. =) With GT40P heads, even a mild cam will do really really well. A nice wide LSA to ensure your car pulls right from off-idle to whatever its peak winds up at. Summit M-series carb with a Weiand Stealth, and you'd have a lot of fun. Make sure your spring rates match whatever you're going to do. The stock springs on GT40P's are soft by roller-cam standards, but not sure they'd be right for a low-rpm flat-tappet cam, and wiping your lobes to find out would not be the recommended method.

"No matter what you are, be the best one you can." -Abraham Lincoln
Grimbrand is offline  
post #5 of 16 (permalink) Old 07-02-2019, 12:57 PM
Senior Member
 
sportsroof69's Avatar
 
Join Date: Mar 2009
Location: Somewhere down in Texas
Posts: 5,445
Keep in mind the gt40p heads will require special headers.
sportsroof69 is offline  
post #6 of 16 (permalink) Old 07-02-2019, 01:09 PM Thread Starter
Senior Member
 
DaleB's Avatar
 
Join Date: Feb 2019
Location: Omaha, NE
Posts: 182
Garage
Quote:
Originally Posted by sportsroof69 View Post
Keep in mind the gt40p heads will require special headers.
Now that you mention it... I wonder if the stock cast iron exhaust manifolds would work or not. Yeah, I know, they suck... but a set of headers is really not in the budget, since it would also require tossing or at least heavily modifying the perfectly good, near new exhaust system that's' already there. If those wouldn't bolt up to the GT40P heads, then I'd probably stick with the stock heads. (echo) Yeah, I know, they suck... But again, street car, mild build, not building a stoplight terror.
DaleB is offline  
post #7 of 16 (permalink) Old 07-02-2019, 01:41 PM
Moderator
Supporting Member
 
Join Date: Dec 2012
Location: Huntsville, AL
Posts: 8,410
Garage
The Comp Cams N271 is a decent cam for the street. Its somewhat comparable to the original HiPo cam, but with a much tighter modern lash and some other minor tweaks. I ran the N271-S (solid lifter) for about two years. Drove it to and from the NPD show in Ocala and averaged 16 MPG. Ill add, cam choice should definitely be based on the entire engine build. You will get at least 100 different opinions. Talk to Comp or whomever you prefer and describe the entire engine and the exact use of the car. They will point you in the right direction.

At the very least, you should consider some repo Scott Drake HiPo exhaust manifolds. Otherwise, anything you do to the engine will be wasted right at the exhaust port interface.

Regards,
Patrick
patrickstapler is online now  
post #8 of 16 (permalink) Old 07-02-2019, 02:41 PM
Senior Member
 
jdub's Avatar
 
Join Date: Dec 2011
Location: Colorado
Posts: 4,600
HiPo manifolds will work with GT40P heads. I'd recommend those and a stock 5.0 HO roller cam with linkbar lifters or an E-Cam. Keep it simple.

As for the intake manifold, I like the Weiand Street Warrior for lightly modified 289s. A Summit 500cfm carb is a decent alternative to the 4100.

All of the above should give you a really nice, reliable engine with good street manors and a decent amount of power.
2nd 66 and gt66a like this.

1965 Mustang

Last edited by jdub; 07-02-2019 at 02:43 PM.
jdub is offline  
post #9 of 16 (permalink) Old 07-02-2019, 04:35 PM
Senior Member
 
Join Date: Mar 2001
Location: Tunkhannock PA
Posts: 19,701
Quote:
Originally Posted by sportsroof69 View Post
Keep in mind the gt40p heads will require special headers.
They donít need special headers you just have to pick the right ones. Iím using off the shelf MAC long tubes for 65/70.
2nd 66 likes this.

Tom

One thing great about getting older. A life in prison sentence is less of a deterrence

Huskinhano is online now  
post #10 of 16 (permalink) Old 07-02-2019, 04:41 PM
Senior Member
 
Woodchuck's Avatar
 
Join Date: Mar 2001
Location: Peoples Republic of Vermont
Posts: 32,946
Send a message via Yahoo to Woodchuck
Go with a .020" overbore.
Pistons: Silv-O-Lite Hypereutectic 3101HC-020
Intake: Weiand Stealth #8020
Carb: Summit M2008VS500
Lifters: Trick Flow TFS-21400006
Cam: M-6250-B303
Exhaust Manifold: Reproduction HiPo
Huskinhano and Grimbrand like this.

Bart

What, me worry?
- Alfred E. Neuman

Woodchuck is offline  
post #11 of 16 (permalink) Old 07-02-2019, 04:45 PM
Senior Member
 
Join Date: Mar 2001
Location: Tunkhannock PA
Posts: 19,701
For a lot less money and trouble buy a good used GT40P! Thatís what I did. Paid $450 for one with the trans. Sold off what I didnít want for $175. Net cost was $275. Bought a used 5.0 cam $60, used Wieand Stealth $80, used Edelbrock 600. $125. Put a spring kit in. So not a lot of money invested. Not built to Grimbrandís suggestions just happened to. Let me tell you, it runs real well! I almost hate to change anything because it runs so well and it was stupid cheap
2nd 66 and Grimbrand like this.

Tom

One thing great about getting older. A life in prison sentence is less of a deterrence

Huskinhano is online now  
post #12 of 16 (permalink) Old 07-02-2019, 05:07 PM
Senior Member
 
Join Date: Mar 2001
Location: Tunkhannock PA
Posts: 19,701
At some point in the day when youíre in your small, private reading room

https://forums.vintage-mustang.com/v...g-my-66-a.html
2nd 66 likes this.

Tom

One thing great about getting older. A life in prison sentence is less of a deterrence

Huskinhano is online now  
post #13 of 16 (permalink) Old 07-02-2019, 05:49 PM
Senior Member
 
sportsroof69's Avatar
 
Join Date: Mar 2009
Location: Somewhere down in Texas
Posts: 5,445
Quote:
Originally Posted by Huskinhano View Post
They don’t need special headers you just have to pick the right ones. I’m using off the shelf MAC long tubes for 65/70.
Ah well.....there you go.
sportsroof69 is offline  
post #14 of 16 (permalink) Old 07-02-2019, 09:58 PM
Senior Member
 
bbmach's Avatar
 
Join Date: Dec 2018
Location: Atl
Posts: 273
Garage
If you're going to stay with a stock torque converter and 2.80 gears, be extra careful with the cam choice. I've built a similar SBF (Performer intake, small Holley, Hi-Po Exhaust Manifolds, stock H-Pipe duals) a few years ago, and went with a 204 / 214 / .449" / .473" 112/ LC cam, advanced two additional degrees. It was peppy and responsive, but I wouldnít call it powerful. It was done by about 4,500 rpm.
2nd 66 likes this.

1969 Mach-1 Mustang
460 / C6 / 9"
Back in Dixie DSO 22 (Charlotte)
bbmach is offline  
post #15 of 16 (permalink) Old 07-02-2019, 10:30 PM
Senior Member
 
66coupe289's Avatar
 
Join Date: Sep 2001
Location: Milwaukee (Sussex), WI
Posts: 2,186
I am with bbmach. I ran the Performer .448/.472 cam and it worked well with an auto and 3.00 gears. Run headers if you can.
2nd 66 likes this.

Chris (Sussex, WI)

289 w/AFR 165, T-5z, 3.55T-loc, Granada Discs and 6 bolt Moto-Lita Steering Wheel
66coupe289 is offline  
Sponsored Links
Advertisement
 
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Vintage Mustang Forums forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in










Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page



Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On
Trackbacks are On
Pingbacks are On
Refbacks are Off

 
For the best viewing experience please update your browser to Google Chrome