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Author
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Topic: Still trying to figure out 351c problem. Is it my 2.25" intake valve?
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70coupe
Gearhead Posts: 139
From: Toronto,Ontario,Canada
Registered: Aug 2000
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posted 07-03-2001 05:51 AM
  
I'm still trying to figure out my 351c-4v combo problem. It's not running the ET's that I should be getting. My best run is a [email protected]. I should be getting atleast mid 12's. Wen the heads were rebuilt, the intake seats were a bit worn so we put in 2.25" valves instead of the stock 2.19" valve. Could this be my problem. Poor flow and the intake valve needs to be unshrouded? Is the chamber size too small on the closed chamber head for that size of valve?
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Moneymaker
Administrator Posts: 9999
From: Lyons, IL, USA
Registered: May 99
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posted 07-03-2001 12:55 PM
I can't see how the valves can hurt your performance. I still thinnk that it's in your tune up.  ------------------
Alex Denysenko
Co-Administrator and Moderator
NHRA/IHRA/SRA member
NHRA and IHRA SS/LA National Record Holder '00 & '01
Fleet of FoMoCo products
Moneymaker Bio
US Class Nationals link
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70coupe
Gearhead Posts: 139
From: Toronto,Ontario,Canada
Registered: Aug 2000
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posted 07-03-2001 06:16 PM
My jetting is 74 primary 75 secondary plugs look good, power valve is 5.5 and timing is 11/37. I know I can go a little more on the initial but it wont make that much of a difference. Any ideas where else to look?
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Rustang
Gearhead Posts: 124
From:
Registered: Nov 2000
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posted 07-03-2001 09:20 PM
At what RPM is your timing all in by?------------------
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70coupe
Gearhead Posts: 139
From: Toronto,Ontario,Canada
Registered: Aug 2000
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posted 07-04-2001 10:56 AM
Its all in by about 3000. Somebody told me Holley/Weiand makes a plenum divider for the x-cellerator manifold. I wonder if this might speed my air flow through the heads.
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kid vishus
Gearhead Posts: 1598
From: from between the end of the road, and the middleof no-where
Registered: Oct 2000
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posted 07-04-2001 11:43 AM
The best way to speed up the ariflow thru those heads is with more camshaft and turn it tighter. 
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70coupe
Gearhead Posts: 139
From: Toronto,Ontario,Canada
Registered: Aug 2000
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posted 07-04-2001 03:03 PM
What do you mean by turn it tighter? Sorry for my ignorance or maybe you use a different word down there. Anyone care to comment on my jetting or power valve? My squirters were 35 primary/37 secondary. For my next pass at the track I will try 37 primary/35 secondary.[This message has been edited by 70coupe (edited 07-04-2001).] [This message has been edited by 70coupe (edited 07-04-2001).]
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kid vishus
Gearhead Posts: 1598
From: from between the end of the road, and the middleof no-where
Registered: Oct 2000
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posted 07-04-2001 04:49 PM
I amn sorry, my grammer gets bad at times. By "turning it tighter" I mean give it more rpm. Wind it up more, those big heads like the rpm, but unfortunately, the block and the oiling system isnt real fond of it.
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Fordwiser
Journeyman Posts: 55
From: Metamora, Illinois
Registered: Dec 2000
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posted 07-04-2001 05:10 PM
70 coupe I've been following along in here and other message boards and I have some things to try. In my old Cleveland motor I ran a combination pretty close to yours, best time was a 11.74@114 I ran a little less cam and a torker intake, it ran best with a 4 hole 2inch spacer, seemed to give it more low end. I ran a c-4 tranny, you're giving up et by running a c-6, JPT transmissions sells a spline adapter to use a c6 converter in a c4. I ran 4.56 gears in mine, I think your 4.11s just aren't letting your cam stay in it's power band. If you don't want to rev it that high 4.30 would help. Also wondering if you degreed the cam to specs when you installed it? If the cam is retarded could be slowing you down, advancing will give more low end and cylinder pressure, just make sure you check piston to valve clearance, because it will change it. Hope some of this might help! Roger
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SteveLaRiviere
Administrator Posts: 18672
From: Saco, Maine MCA # 47773
Registered: May 99
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posted 12-12-2001 07:22 PM
70coupe, I was wondering if you made any progress on your Cleveland's ETs?------------------
'70 Mustang Mach 1 M code 351C 4V/FMX/3.25 open
'72 Mustang Sprint Coupe 351C 4V/FMX/4.30 Trac Lok
'94 F-150 XL 5.8L/E4OD/3.55 Limited Slip
'97 Probe GTS 2.5L DOHC Christmas shopping? Why not use the
M&M Bookstore?
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70coupe
Gearhead Posts: 139
From: Toronto,Ontario,Canada
Registered: Aug 2000
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posted 12-12-2001 08:27 PM
My best ET to date is 12.377@110. I have a few things to change over the winter then I'll be right back at it in the spring. As you remember I destroyed the motor in September and put another one built to the same specs in but with a slightly larger cam.
(.570/.590 crane solid with 246/256 duration)and this time it has manley severe duty valves. Only ran it for one weekend and it ran 12.377@110,exactly 1/1000 of a second quicker than my old motor. I think I'll hit 11.99 next year when I have a chance to tune it and lose some weight. I'm also looking for a stud girdle,a 4 hole 2" phenolic spacer and a larger carb than a 750dp.
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MrXerox
Gearhead Posts: 197
From: Oklahoma, Oklahoma, USA
Registered: Nov 2000
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posted 12-13-2001 10:08 AM
Put a 950HP on there...You will be very happy with the results
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kid vishus
Gearhead Posts: 1598
From: from between the end of the road, and the middleof no-where
Registered: Oct 2000
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posted 12-13-2001 04:18 PM
I use a Jomar stud girdle. It's a nice piece, and not real expensive.
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