C80E-F heads

10303 Views 25 Replies 7 Participants Last post by A/S65, Mar 9, 2013

A/S65

Discussion Starter · Feb 18, 2013

I aquired a set of 68 4v F heads over the weekend, they've been ported, 7/16 screw in studs and guide plates. They still have the factory valves though. I'm wanting to put bigger valves in them but am curious if with the 53.5 cc chambers, that I'm going to run into a valve shrouding problem with 1.94s. Or would I best be served with going with a 1.87 or 1.90 on the intake.

These are going on a 306, that I'm building to meet vintage rules mandating factory cast head. So please no ditch the iron and get some aluminum heads replies.

1 - 20 of 26 Posts

Jsams

· #2 · Feb 19, 2013

What exactly does "Factory Iron" mean? The N351 heads are factory iron....
A serdi can unshroud the chamber for the 1.94 valves I believe.

turbo2256b

· #3 · Feb 19, 2013

If there 302/289 heads dont go over the stock sizes used in a stock 69ish 351W. Found I could get better air flow not going bigger
If there 351W 69ish port size the 1.94 and 1.6 exh work out fine.

D0ZF

· #4 · Feb 19, 2013

Had my original 302 J code Shelby motor built to a stroker 347 while keeping the original C8OE-F heads. The heads got a mild porting and had slightly larger valves installed. Exhausts are 1.60 but I'm not exacly sure of the intake size I do however know its not 1.94.

Motor was dynoed with original carb and peaked at 380 hp and 425 of torque. Also ran a couple of passes with a dual quad setup on the same motor and peaked at 370hp but interestingly at about 5800 rpm which was about 500 more RPMs then with the single holley setup.

D0ZF

· #5 · Feb 19, 2013

Have you looked at the WORLD cast iron heads
http://www.summitracing.com/parts/wrl-053030-1/overview/

A/S65

Discussion Starter · #6 · Feb 19, 2013 (Edited)

J I should have clarified, heads have to be pre 72 Ford Castings. The F head has a port size of 1.94 x 1.04 while the 69 351 is 1.94 x 1.76. I need to get these on a flow bench to see where I'm at. I just looked at a flow chart with 1.94s and a good port and bowl work these can flow 215 cfm at .500 lift.

Interesting info on the dual quad, as that is what I am planning on running.

Helmantel

· #7 · Feb 19, 2013

I don't know the exact port width of the 351W heads, but they're not 1.76", which would make them more or less square. They're probably a bit over 1.20", maybe 1.26"?

Helmantel

· #8 · Feb 19, 2013

D0ZF said:
Had my original 302 J code Shelby motor built to a stroker 347 while keeping the original C8OE-F heads. The heads got a mild porting and had slightly larger valves installed. Exhausts are 1.60 but I'm not exacly sure of the intake size I do however know its not 1.94.

Motor was dynoed with original carb and peaked at 380 hp and 425 of torque. Also ran a couple of passes with a dual quad setup on the same motor and peaked at 370hp but interestingly at about 5800 rpm which was about 500 more RPMs then with the single holley setup.

So, the single carb setup made 380 hp at 5800-500=5300 RPM? That's impressive.

Jsams

· #9 · Feb 19, 2013

Is a Boss 302 legal?
That would be the way to go and was Fords answer back in the day.

A/S65

Discussion Starter · #10 · Feb 19, 2013 (Edited)

Jsams said:
Is a Boss 302 legal?
That would be the way to go and was Fords answer back in the day.

Unfortunately not for my 67, I wish it was. Boss heads are not legal for 68 and older.

Helmantel I'm just going by the numbers listed for C90E-B and D 351. They are listed as 60cc 1.84int /1.54 exh. 1.94x 1.76 int port, and 1.24x 1.00 exh. Other than these 69 the 351 ran the same size valves and ports as the early 302. Again I'm going by the two casting charts I have in front of me.

turbo2256b

· #11 · Feb 19, 2013

Have ported 100s of 302 size port heads. The port size / volume along with combustion chamber the stock 351w 69ish valve size we get 220 CFM at .500 lift. Larger valves might flow a bit more over .500 but its at a loss of more flow below that point from .1 on up. I also suggest using Ferrara valves as they seem to pick up flow over most.
Deffinatly have them flow tested post the results before going further.
I will get out my old Ford spec book later.
Over stock we usaually picked up 160 total CFM over stock.

turbo2256b

· #12 · Feb 19, 2013 (Edited)

68 4v head specs
Chamber CCs 52 to 55 cc
Valve sizes 1.78 / 1.45... my size reommendation 1.84 / 1.54 (351W 69 to 71)
Port size W x H 1.04 x 1.94..... 1.16 x 1.94 (351W 69 to 71)
Thermactor emmision control.

What rules as to cam intake, carb

66resto

· #13 · Feb 19, 2013 (Edited)

6

This discussion is over my head, but I like to learn, but when I was researching my N351 heads, they seemed to be the head of choice for those wanting to run Ford Iron in class races. 11 degree head, hard to shroud it, run a true flat top piston (mine are a 4.035 size with no valve reliefs), large exhaust ports, pretty good flow out of the box for a Ford head, lots of potential if you care to have them ported. Had Ferra 5000 2.055 valves installed for the intake, flows around 206 at .300, 262 at .500 and 279 at .600.

Supposed to be a very efficient head. Of course requires the offset rockers and the wide header flange which is cost prohibitive for some, but a very good Ford head.

See less See more

66resto

· #14 · Feb 19, 2013

Sorry, I just now read about the pre '72 casting...disregard. Still a good head when permitted.

A/S65

Discussion Starter · #15 · Feb 19, 2013 (Edited)

Turbo thanks for the info, I was also concerned with loosing some low end torque with the bigger valves. Rules are flat tappet, period design dual plain intake, no air gap. Roller rockers are allowed.

Resto no problem.

Lukesportsman

· #16 · Feb 19, 2013

How much can you pick up in this size range with good undercut valves? Are they allowed? Is this a tear down class or honor system? Most of us acknowledge that though Ford got many things "right". Head flow wasn't their strongest attribute relative to others. Any edge possible could be worth it to make stock heads flow.

turbo2256b

· #17 · Feb 20, 2013

A/S65 said:
Turbo thanks for the info, I was also concerned with loosing some low end torque with the bigger valves. Rules are flat tappet, period design dual plain intake, no air gap. Roller rockers are allowed.

Resto no problem.

So you can run something like a performer RPM? My testing of RPM Air Gaps are there over rated more hype than power. One test 5 more HP but lost to adding up power total.
Dual quads allowed had to ask. Any carb limitations?

A/S65

Discussion Starter · #18 · Feb 20, 2013

As far,as I can gather from the rules, the dual 4 highrise is a period dual plane intake and is legal. Basicly what I'm looking to do is build the car to 68 A/S, T/A rules. Minus the tunnel port.

turbo2256b

· #19 · Feb 20, 2013

Have the heads flowed then I will get into the intake

D0ZF

· #20 · Feb 20, 2013

Are you looking at the SVRA rules
http://www.svra.com/wp-content/uploads/2013/02/Ford-Mustang_Sedans_64-70.pdf

From what I seen these rules serve as some kind of guideline but when you go check out the cars running these events its quite clear most are far from those rules.

1 - 20 of 26 Posts

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