347 hp? - Page 2 - MustangForums.com

Notices
5.0L General Discussion This section is for non-tech specific information pertaining to 5.0L Mustangs.

347 hp?

Reply

 
 
 
Old 04-26-2011, 04:35 PM
  #11  
67mustang302
6th Gear Member
 
Join Date: Apr 2007
Location: California
Posts: 10,468
Default

.....

It's too hard to say without knowing more about the heads. Ported to the max by a pro that 347 could make decent power, but not any more than a 302 with decent heads and a cam.

And the Edelbrock carbs aren't really a performance carb. And the 4150 Ultras are a way overpriced variant of the 4150 with the same tuning options as other carbs. You can do the same thing with a Quick Fuel etc, but for a lot less money.

And a 750 is fine for a 347, a 650 would strangle the life out of a properly built 347. Which by the way, would need a hell of a lot more head than GT40anythings. I wouldn't put anything less than AFR 185 comps or TFS 190's etc on a 347.
67mustang302 is offline  
Reply With Quote
Old 04-26-2011, 05:47 PM
  #12  
mjr46
D.R. THE PATHETIC DORK
 
mjr46's Avatar
 
Join Date: Jun 2007
Location: West Virginia
Posts: 30,809
Default

Originally Posted by Ten/Seven View Post
Yea, the carb thing. 750 is way, way to big for a 347ci.
.
750 is not to big with the right top end and valve events, I run a modified holley 750 hp on my 347...and runs well and fast = 10's
mjr46 is offline  
Reply With Quote
Old 04-26-2011, 06:03 PM
  #13  
Ten/Seven
 
Ten/Seven's Avatar
 
Join Date: Apr 2011
Location: CA
Posts: 33
Wink

Originally Posted by 67mustang302 View Post
.....

It's too hard to say without knowing more about the heads. Ported to the max by a pro that 347 could make decent power, but not any more than a 302 with decent heads and a cam.

And the Edelbrock carbs aren't really a performance carb. And the 4150 Ultras are a way overpriced variant of the 4150 with the same tuning options as other carbs. You can do the same thing with a Quick Fuel etc, but for a lot less money.

And a 750 is fine for a 347, a 650 would strangle the life out of a properly built 347. Which by the way, would need a hell of a lot more head than GT40anythings. I wouldn't put anything less than AFR 185 comps or TFS 190's etc on a 347.

The 4150 is overpriced, Agreed, A demon, Quick fuel or some other ect. is fine. I use a road demon jr. on my car and like it... I like the 4150, Its solid. I like the performance out of the box. my brother's looks well built and like a higher quality of carb than mine. Whats that everyone says on the forum
"Good, Fast, Cheap. Cant have all 3" ??

On a 2.2 cm Restrictor plate, Nationwide cars make 470hp. In the mid 70's Before the restrictor plate, Nascar said 390 cfm was max, the cars where still to fast. I am sure 650 is enough for a street driven mustang. Big cfm #'s do not add inches to your junk, yet everyone loves them so??? Just Because they make an 1100 cfm carb dose not mean your 347 needs one. 650 cfm supports a little over 400 cubes @ 110% volumetric efficacy Anything street driven comes nowhere close to that without a power adder. I have spent countless hours working on everything from a Wankel Rotary that makes 700+ hp on 93 cubes & 800cc injectors all the way to Mann diesels that power ocean liners and cargo ships. I have a degree in Diesel Tech.

As far as the gt40p, notice I said "On a Budget". Not everyone can afford 13 to 16 hundy for a set of Alloys. For $200.00 + gaskets GT40p's are yours. With a $40.00 Makita grinder and half a fargan brain you can port match them up and get some flow..... Isn't there a tread on this very forum about 300+ rwhp on gt40p's with injection and 302 cubes??

<~ That's me floating in a sea of reason, all alone. lol. Well back to work.

Last edited by Ten/Seven; 04-27-2011 at 12:41 AM.
Ten/Seven is offline  
Reply With Quote
Old 04-27-2011, 12:27 AM
  #14  
Ten/Seven
 
Ten/Seven's Avatar
 
Join Date: Apr 2011
Location: CA
Posts: 33
Default

Originally Posted by mjr46 View Post
750 is not to big with the right top end and valve events, I run a modified holley 750 hp on my 347...and runs well and fast = 10's
I am sure it runs fine. Try a 725 cfm Road or race demon and watch your low end and throttle response go up. top end #'s don't give you beer flavored nipples. its all about usable power. I prefer a set up that makes maybe 5 or 7 less hp for the last 500 rpm but makes 7 to 10 hp more from 2,000 till then. A good set up to me makes the power quick & low. You jump it, It Growls! If its for the track only that's a different thing.
Ten/Seven is offline  
Reply With Quote
Old 04-27-2011, 01:01 AM
  #15  
CBurn
2nd Gear Member
 
CBurn's Avatar
 
Join Date: Sep 2007
Location:
Posts: 381
Default

Originally Posted by Ten/Seven View Post
As far as the gt40p, notice I said "On a Budget". Not everyone can afford 13 to 16 hundy for a set of Alloys. For $200.00 + gaskets GT40p's are yours. With a $40.00 Makita grinder and half a fargan brain you can port match them up and get some flow..... Isn't there a tread on this very forum about 300+ rwhp on gt40p's with injection and 302 cubes??

<~ That's me floating in a sea of reason, all alone. lol. Well back to work.
heh that's what I was thinkin. 1500ish is alot sometimes. Unfortunately though, OP if you don't get some high flow heads you won't be using it to it's potential. You'd be better off getting rid of the 347 and getting a nice 302 block and dressing it yourself. Idk just an option I guess. Personally I'd just save up money for better heads/cam and work your way from there.
CBurn is offline  
Reply With Quote
Old 04-27-2011, 07:47 AM
  #16  
mjr46
D.R. THE PATHETIC DORK
 
mjr46's Avatar
 
Join Date: Jun 2007
Location: West Virginia
Posts: 30,809
Default

Originally Posted by Ten/Seven View Post
I am sure it runs fine. Try a 725 cfm Road or race demon and watch your low end and throttle response go up. top end #'s don't give you beer flavored nipples. its all about usable power. I prefer a set up that makes maybe 5 or 7 less hp for the last 500 rpm but makes 7 to 10 hp more from 2,000 till then. A good set up to me makes the power quick & low. You jump it, It Growls! If its for the track only that's a different thing.
I've had a 650 on it before, the 750 delivers more, btdtst!
mjr46 is offline  
Reply With Quote
Old 04-27-2011, 08:03 AM
  #17  
jst98gtmustang
3rd Gear Member
Thread Starter
 
jst98gtmustang's Avatar
 
Join Date: Aug 2007
Location: WV
Posts: 848
Default

this is what the guy told me about the heads..

the heads are 1965 289 58cc heads with 1.7 roller rockers with chevy valves port and polished there is over 1,400 dollars in head work not counting the parts.. they make the compression 10.9:1..

The car seem like a really good running car.but if i have to save up for some heads that's not a big deal.The body is perfect that matter to me more cause the small things in engine i can add little at time..So would gt40 heads be a good idea if you p&p them like that one guy said??
jst98gtmustang is offline  
Reply With Quote
Old 04-27-2011, 09:03 AM
  #18  
mjr46
D.R. THE PATHETIC DORK
 
mjr46's Avatar
 
Join Date: Jun 2007
Location: West Virginia
Posts: 30,809
Default

Originally Posted by jst98gtmustang View Post
this is what the guy told me about the heads..

the heads are 1965 289 58cc heads with 1.7 roller rockers with chevy valves port and polished there is over 1,400 dollars in head work not counting the parts.. they make the compression 10.9:1..

The car seem like a really good running car.but if i have to save up for some heads that's not a big deal.The body is perfect that matter to me more cause the small things in engine i can add little at time..So would gt40 heads be a good idea if you p&p them like that one guy said??
1400 in wasted money, he could of had twice the head for the same price and no reason to remove those heads in favor of a lesser performing head with the work that has been done to the 289 heads currently.
mjr46 is offline  
Reply With Quote
Old 04-27-2011, 09:58 AM
  #19  
AdderMk2
Banned
 
Join Date: Dec 2005
Location: Lil' Rhody
Posts: 22,376
Default

Originally Posted by jst98gtmustang View Post
this is what the guy told me about the heads..

the heads are 1965 289 58cc heads with 1.7 roller rockers with chevy valves port and polished there is over 1,400 dollars in head work not counting the parts.. they make the compression 10.9:1..

The car seem like a really good running car.but if i have to save up for some heads that's not a big deal.The body is perfect that matter to me more cause the small things in engine i can add little at time..So would gt40 heads be a good idea if you p&p them like that one guy said??
GT40 heads are almost the same as the 289 heads. With that aside... GT-40 anything doesnt belong NEAR a 347... let alone ON one. Find yourself a used set of 185+ cc heads, or some 170cc tfs twist wedges (which youd have to have ported), and call it a day. FWIW, I bought used Canfield heads for $650... Yes, a $1500 set of heads...
AdderMk2 is offline  
Reply With Quote
Old 04-27-2011, 10:03 AM
  #20  
jst98gtmustang
3rd Gear Member
Thread Starter
 
jst98gtmustang's Avatar
 
Join Date: Aug 2007
Location: WV
Posts: 848
Default

what would it make with a good set of heads?
jst98gtmustang is offline  
Reply With Quote

Thread Tools
Search this Thread
Quick Reply: 347 hp?


Advertising
Featured Sponsors
Vendor Directory

Contact Us Archive Advertising Cookie Policy Privacy Statement Terms of Service

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.