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Author
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Topic: Another, "How much HP?" question
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grandestang
Journeyman Posts: 21
From: Lake Bluff, Illinois USA
Registered: Jan 2003
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posted 03-21-2003 10:16 PM
   
I know this is similiar to the 289-302 buildup moneymaker did, but I want to know if I will achieve the same results (1HP per cubic inch) with a 351W.
With:
270H cam
valve job
performer RPM manifold
Holley 700?
Hooker super compsWhat kind of HP do you think this will put out at the flywheel. Im hoping for 350. If not, what will take me there in addition to this, besides new heads- I want to keep the stock ones for now.
Also with shift kit in FMX, and 3.55:1 Posi what do you think this combo would run in my grande?
I know these questions can get annoying but, hey, I'm young and I am curious to what the performance increase will be after all this is done. Thanks.  Paul ------------------
1970 Grande
H code 351W FMX
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steve'66
Gearhead Posts: 5659
From: Sonoma,CA,USA
Registered: Mar 2000
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posted 03-22-2003 02:55 AM
Paul,What's the compression ratio? Which heads? And what exhaust system are you planning? The Grande is heavy and so is the FMX. As far as what it'll run, what have you done for traction and gearing? SteveW
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grandestang
Journeyman Posts: 21
From: Lake Bluff, Illinois USA
Registered: Jan 2003
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posted 03-22-2003 11:52 AM
quote:
Originally posted by steve'66:
Paul,What's the compression ratio? Which heads? And what exhaust system are you planning? The Grande is heavy and so is the FMX. As far as what it'll run, what have you done for traction and gearing? SteveW
Its an H-code so it as the 2V compression ratio, which I believe is 9.5:1 as I hope I can still use standard bore and not have to replace the pistons.
Behind the hooker headers Im planning the Flwomaster mandrel bent 2 1/2 system with 50 series 3 chambered mufflers.
For gearing/traction all I plan is the 3.55:1 or 3.50:1 trac-loc rear gear. And I plan to have at least 7inch wide BF radial T/a's out back and up front wrapped around some torq thrusts possibly. (with same tire height as stock)
This is not meant to be a real quarter mile bruiser, I just want something that can really move when I want it to. I guess to put it into times I would hope for low 14 second range. (even high thirteens if possible) I dont know how close or far away I am from that with this combo. Oh yeah, and is the Grande really thaat heavy? I thought all that really seperated it from a standard coupe as far as weight was the 50 pounds of sound deadening insulation they put in all grandes (and Mach 1s). But I imagine that it is a heavier that optimal car. Thanks alot.
Paul
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mustangboy
Gearhead Posts: 520
From: Ont, Canada
Registered: Mar 2002
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posted 03-22-2003 05:30 PM
I think the key is traction for your combo at the dragstrip.If you get some sticky tires high 13s should be possible with good tuning.
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steve'66
Gearhead Posts: 5659
From: Sonoma,CA,USA
Registered: Mar 2000
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posted 03-22-2003 09:33 PM
Paul,It's heavy for a Mustang, at least compared to a 65/66.  It'll probably run 14-15s w/o some better heads or porting, at first anyway. Good luck and enjoy the journey through modifying the car. A 14-15 second car is a blast on the street too.  SteveW
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grandestang
Journeyman Posts: 21
From: Lake Bluff, Illinois USA
Registered: Jan 2003
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posted 03-23-2003 01:48 AM
Alright thanks alot guys, that sounds pretty solid. I'm real excited to get this project going and I'm hoping to be done in two months. I can't wait until summer where I'll be cruising enjoying my last summer before I go to college. Thanks again.Paul ------------------
1970 Grande
H code 351W FMX
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grandestang
Journeyman Posts: 21
From: Lake Bluff, Illinois USA
Registered: Jan 2003
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posted 03-24-2003 01:38 PM
Now I'm starting to think about changing the heads for some roush 200's or performer RPM's. With this and the above set up I know that I would be getting into some serious horespower- im guessing in the 400 range. Is this too much of a leap for now, especially since I'm only a senior in high school? I am getting in over my head, or should I go for it? Just looking for opinions.
Oh yeah, and the much asked question lately: Roush 200 or Performer RPM, remember I do live in the Chicago area and it could see some cold days, but I do not generally drive in the winter ESPECIALLY NOT in snow (they really love the salt around here) Thanks------------------
1970 Grande
H code 351W FMX
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james306
Journeyman Posts: 41
From: falmouth,me,usa
Registered: Feb 2003
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posted 03-24-2003 07:13 PM
before you get too far think about what you want for a finished product compared to your budget. you could get about 350-370 hp with the right cam and some very careful head porting as long as you can keep a compression ratio of 9.5:1-10:1. aftermarket heads rock but they are pricey and not everyone can swing that kind of cash. head porting is not difficult if you know what you are doing and it can yield some very nice results. check out the tech department here at ford muscle and look into the head porting article. im assuming you still have stock cast pistons. how many miles on the engine? what year are your heads.------------------
68 mustang coupe. 306 in progress, factory rods w/arp bolts, factory crank, HV oil pump w/chromemoly shaft, home made 8 quart oil pan w/extended pick up, KB hyper .100 dome pistons, D0OE 351w heads heavily ported with 1.94/1.60 ss valves, victor jr intake with holley 750.
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grandestang
Journeyman Posts: 21
From: Lake Bluff, Illinois USA
Registered: Jan 2003
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posted 03-25-2003 01:42 PM
quote:
Originally posted by james306:
before you get too far think about what you want for a finished product compared to your budget. you could get about 350-370 hp with the right cam and some very careful head porting as long as you can keep a compression ratio of 9.5:1-10:1. aftermarket heads rock but they are pricey and not everyone can swing that kind of cash. head porting is not difficult if you know what you are doing and it can yield some very nice results. check out the tech department here at ford muscle and look into the head porting article. im assuming you still have stock cast pistons. how many miles on the engine? what year are your heads.
Yes I do still have the stock cast pistons, in fact the whole motor is a stock 1970 351W 2V, with of course the 1970 2V heads. There are 108,000 miles on the engine and I am about to rebuild/overhaul the engine. I am hoping everything will still look good. The problem I have with porting my stock heads is that I have heard that doing this can be almost as expensive as a new set of heads, assuming I completely rebuilt the heads after porting. If there is only like a $200-$300 difference betweeen new and ported/rebuilt stock heads than I think I should just cough up the extra cash and go with the new heads.
Oh yeah, and I wouldn't know what I would be doing porting the heads, so I would have to pay labor to have someone do that.
I'm thinking I should just go with some Roush 200's for compatability with the cold weather. How do these stack up to the aluminum Performer RPM's? ------------------
1970 Grande
H code 351W FMX
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mustangboy
Gearhead Posts: 520
From: Ont, Canada
Registered: Mar 2002
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posted 03-25-2003 02:07 PM
quote:
check out the tech department here at ford muscle and look into the head porting article.[/B]
. James your on the wrong site,  ------------------
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 [This message has been edited by mustangboy (edited 03-25-2003).]
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james306
Journeyman Posts: 41
From: falmouth,me,usa
Registered: Feb 2003
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posted 03-25-2003 07:08 PM
oops my bad. i am a member of too many ford forums. ------------------
68 mustang coupe. 306 in progress, factory rods w/arp bolts, factory crank, HV oil pump w/chromemoly shaft, home made 8 quart oil pan w/extended pick up, KB hyper .100 dome pistons, D0OE 351w heads heavily ported with 1.94/1.60 ss valves, victor jr intake with holley 750.
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