[Itsasix]

I am looking to swap my small log for a big log head and have some mild work/ refresh done.
Please look at this and see if something doesn't look right.

Factory 66 inline 6 with small log. To my knowledge it is the original engine.
Head: C6D6-6090-B
Block: C6DE-6015-B

The replacement head is from a 76 Maverick (so I was told)
Head: D5DE-8090-BA

The remaining upgrades:
Schneider cam 265H (256 int/ exh, 204 int/ exh dur, 420 int/ exh lift, 112 lobe sep, 1250-4000 rpm range) - Cam, springs & lifters recommended by Jerry Cantrell
Schneider 68044 valve spring set
Schneider 5335 hyd, lifters
New valves, guides, seals (already purchased)
Factory rockers (1:6 are never available)
2BBL Sniper system. The large log head has been machined to accept it. (may or may not go this route depending on the distributor needed, sniper recommends theirs)
DUI distributor (already purchased)
Alt upgrade
Everything else is factory for the engine unless the machine shop finds an issue
Exhaust manifold/ exhaust upgrade
AC has been removed

Nothing too fancy overall.

 

[Wayne clark]

Everything I've read says a bolt on swap .
Find Jeff Jones on the Vintage 6 Facebook site & send him the question . He builds & sell the small 6's along with modified heads for them .
He's a pretty nice guy who will take time to respond to you .
Plus he knows for sure .

 

[Sunlit68]

Just curious…..why do people upgrade a 6? How much power can you eventually tweak? I know they are great motors and run great as is stock.

 

[Woodchuck]

The Felpro Perma-Torque gasket is on "manufacturer's closeout" at rockauto.com for $11.02. More Information for FEL-PRO 7916PT1

It's recommended you have the head milled an additional .070" from stock to make up for the loss of static compression ratio caused by the 10cc larger combustion chambers and .020" increased thickness of today's composite head gaskets over the original .025" steel shim gasket. Bear in mind you want to check pushrod length during assembly.

IMHO, I'd "bag" the HEI distributor and go with either a Duraspark or Holley Hyperspark and let the Sniper control the ignition timing. I also see no need to use such a heavy valve spring with a flat tappet cam with a low rpm peak. Stock springs should work just fine unless you choose a cam with a higher rpm range...which I would, also. For an "alternator upgrade" I'd go with a 95A small-case 3G unit.

Another thing to remember... small six rocker arms are 1.52:1 ratio so when trying to make a comparison based on valve duration specs with a 289 or 302 with 1.6 rockers the actual duration is going to seem the same but will perform like it's smaller.

 

[Woodchuck]

Just curious…..why do people upgrade a 6? How much power can you eventually tweak? I know they are great motors and run great as is stock.

The Aussies reached 436 hp in production Falcons......

 

[Itsasix]

Everything I've read says a bolt on swap .
Find Jeff Jones on the Vintage 6 Facebook site & send him the question . He builds & sell the small 6's along with modified heads for them .
He's a pretty nice guy who will take time to respond to you .
Plus he knows for sure .

Will do, thanks. Youve given me alot of info in the past on this, it just threw me for a bit when I saw the different head gasket numbers.

 

[Itsasix]

The Felpro Perma-Torque gasket is on "manufacturer's closeout" at rockauto.com for $11.02. More Information for FEL-PRO 7916PT1

It's recommended you have the head milled an additional .070" from stock to make up for the loss of static compression ratio caused by the 10cc larger combustion chambers and .020" increased thickness of today's composite head gaskets over the original .025" steel shim gasket. Bear in mind you want to check pushrod length during assembly.

IMHO, I'd "bag" the HEI distributor and go with either a Duraspark or Holley Hyperspark and let the Sniper control the ignition timing. I also see no need to use such a heavy valve spring with a flat tappet cam with a low rpm peak. Stock springs should work just fine unless you choose a cam with a higher rpm range...which I would, also. For an "alternator upgrade" I'd go with a 95A small-case 3G unit.

Another thing to remember... small six rocker arms are 1.52:1 ratio so when trying to make a comparison based on valve duration specs with a 289 or 302 with 1.6 rockers the actual duration is going to seem the same but will perform like it's smaller.

Appreciate the machining info, I think I was just half asleep when I looked up head gaskets last night, now the numbers are the same regardless of year 🧐
The springs were the recommendation of Jerry Cantrel at Schneider.

Im still not awake, I ordered a DUI dist, not HEI.

Id like a set of 1:6 rockers, but always "out of stock".

 

[Itsasix]

Just curious…..why do people upgrade a 6? How much power can you eventually tweak? I know they are great motors and run great as is stock.

I was just looking for minor upgrades since it will already be out of the car. Not even gonna try to race a grandma in this thing, but if it can sound a little nicer and have smoother throttle response, Im down for that.

 

[Wayne clark]

Will do, thanks. Youve given me alot of info in the past on this, it just threw me for a bit when I saw the different head gasket numbers.

Check Rockauto for a Mayhal I think , they have the thinnest compressed thickness . I check when I get home later & if it's a different brand I'll send you the name of it .

 

[Wayne clark]

Appreciate the machining info, I think I was just half asleep when I looked up head gaskets last night, now the numbers are the same regardless of year 🧐
The springs were the recommendation of Jerry Cantrel at Schneider.
Unfortunately I already have the HEI. If it doesnt look like it will work I can always resell. Who knows, maybe the sniper wont happen, cause now I see that they recommend their distributor. I missed that the last time I looked into it.
Id like a set of 1:6 rockers, but always "out of stock".

Find a Dura spark & use it untill you can upgrade to the Hyper Spark with the Sniper . I used the stock points dist & the dura spark thru my MSD 6 AL BOX BEFORE I PURCHASED THE HOLLEY DIST , both worked fine with my 2300 Sniper.

LOOK ON THE FORDSIX site & contact Super4ord ,his name is Darrell .He is a straight up guy ,he might have some stuff you need,/want . He did have a lot of parts for sell a month or so back .

 

[Wayne clark]

Just curious…..why do people upgrade a 6? How much power can you eventually tweak? I know they are great motors and run great as is stock.

For the same reason a guy who own 289/302 2v with a single exhaust most always upgrades to a alumn intake with a 4v & duals when it was perfectly fine in stock form .
The money is burning a hole in our pockets .

 

[Roddster]

As with any cam change, head surface machining, rocker lift change, it is wise to put clay on top of the pistons, turn the engine over (by hand) then take the head back off and measure for any close interference between the piston and the valves.
This of course requires buying a new head gasket every time you torque the head down.

 

[Woodchuck]

This of course requires buying a new head gasket every time you torque the head down.

Unless you happen to have a "checking gasket" (a/k/a steel shim) or a previously compressed head gasket of known thickness to use when checking.

 

[Roddster]

Very true. I just waste a head gasket.

 

[Woodchuck]

Very true. I just waste a head gasket.

At $11.02 on closeout it doesn't hurt all that much... lol. Not like $90 each Cometic SBF gaskets....

 

[Itsasix]

Anyone know what the valve guide size is?
Two are listed.

 

[Woodchuck]

Add the valve stem diameter to the (clearance times two). If your stem is .3100 and your desired clearance is .0010 then you want a guide with an ID of .3120. Replacing valve guides requires machining the cylinder head to the correct dimension for an interference fit with the guide OD.

 

[BlakeTX]

Just curious…..why do people upgrade a 6? How much power can you eventually tweak? I know they are great motors and run great as is stock.

This comes up any time a poor soul brings up the topic of hopping up a 6.

The simple answer is, they either like what they have and want to do some things to make it better (we can surely identify with this), or they like the weirdness factor. I like the weirdness factor too, but have never been able to justify the $$ side of it.

Based on my research, there's not much past an ignition upgrade that passes the "worthwhile" test as far as engine stuff goes on a 200. If I had one and didn't want to V8 swap it, I would put in a T5 and some steep gears and call it done.

 

[JMPsat]

Since you are opening up the intake- it's hard to go wrong with the stainless steel header on eBay for $130 delivered.

 

[coupster]

if you are going to spend all that time building up the top end...I would suggest you take some time on the lower end...new rings, bearings and etc. It is easier to do it once than several times over....just saying.