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  Still trying to figure out 351c problem. Is it my 2.25" intake valve?

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Author Topic:   Still trying to figure out 351c problem. Is it my 2.25" intake valve?
70coupe
Gearhead

Posts: 139
From: Toronto,Ontario,Canada
Registered: Aug 2000

posted 07-03-2001 05:51 AM     Click Here to See the Profile for 70coupe     Edit/Delete Message   Reply w/Quote
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

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From: Lyons, IL, USA
Registered: May 99

posted 07-03-2001 12:55 PM     Click Here to See the Profile for Moneymaker   Click Here to Email Moneymaker     Edit/Delete Message   Reply w/Quote
I can't see how the valves can hurt your performance. I still thinnk that it's in your tune up.

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70coupe
Gearhead

Posts: 139
From: Toronto,Ontario,Canada
Registered: Aug 2000

posted 07-03-2001 06:16 PM     Click Here to See the Profile for 70coupe     Edit/Delete Message   Reply w/Quote
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

posted 07-03-2001 09:20 PM     Click Here to See the Profile for Rustang     Edit/Delete Message   Reply w/Quote
At what RPM is your timing all in by?

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70coupe
Gearhead

Posts: 139
From: Toronto,Ontario,Canada
Registered: Aug 2000

posted 07-04-2001 10:56 AM     Click Here to See the Profile for 70coupe     Edit/Delete Message   Reply w/Quote
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

posted 07-04-2001 11:43 AM     Click Here to See the Profile for kid vishus   Click Here to Email kid vishus     Edit/Delete Message   Reply w/Quote
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

posted 07-04-2001 03:03 PM     Click Here to See the Profile for 70coupe     Edit/Delete Message   Reply w/Quote
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

posted 07-04-2001 04:49 PM     Click Here to See the Profile for kid vishus   Click Here to Email kid vishus     Edit/Delete Message   Reply w/Quote
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

posted 07-04-2001 05:10 PM     Click Here to See the Profile for Fordwiser   Click Here to Email Fordwiser     Edit/Delete Message   Reply w/Quote
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 [email protected] 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

posted 12-12-2001 07:22 PM     Click Here to See the Profile for SteveLaRiviere   Click Here to Email SteveLaRiviere     Edit/Delete Message   Reply w/Quote
70coupe, I was wondering if you made any progress on your Cleveland's ETs?

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'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

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70coupe
Gearhead

Posts: 139
From: Toronto,Ontario,Canada
Registered: Aug 2000

posted 12-12-2001 08:27 PM     Click Here to See the Profile for 70coupe     Edit/Delete Message   Reply w/Quote
My best ET to date is [email protected] 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 [email protected],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

posted 12-13-2001 10:08 AM     Click Here to See the Profile for MrXerox   Click Here to Email MrXerox     Edit/Delete Message   Reply w/Quote
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

posted 12-13-2001 04:18 PM     Click Here to See the Profile for kid vishus   Click Here to Email kid vishus     Edit/Delete Message   Reply w/Quote
I use a Jomar stud girdle. It's a nice piece, and not real expensive.

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