Bullnose Enthusiasts Forum

300 Six Compression Ratio, Intakes, Heads, etc

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Gary Lewis

Re: 300 Six Compression Ratio, Intakes, Heads, etc

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Cool! How 'bout posting a video of you tuning them?

Gary, AKA "Gary fellow": Profile

Dad's: '81 F150 Ranger XLT 4x4: Down for restomod: Full-roller "stroked 351M" w/Trick Flow heads & intake, EEC-V SEFI/E4OD/3.50 gears w/Kevlar clutches
Blue: 2015 F150 Platinum 4x4 SuperCrew wearing Blue Jeans & sporting a 3.5L EB & Max Tow
Big Blue: 1985 F250HD 4x4: 460/ZF5/3.55's, D60 w/Ox locker & 10.25 Sterling/Trutrac, Blue Top & Borgeson, & EEC-V MAF/SEFI

FuzzFace2

Re: 300 Six Compression Ratio, Intakes, Heads, etc

In reply to this post by 85lebaront2

Man I have not seen under the hood of one of them in years.
Got to love that fan belt.
Then they wonder why they would throw belts when the RPM got a little high

That was before everything had to have a cover over it so it would not "eat you"!

Think they made one with a turbo (spider?) what carb did that have, was it a v4?
Dave ----

Dave G.
81 F100 flare side 300 six / AA OD / NP435 / 2.75 gear
http://cars.grantskingdom1.com/index.php/1980-Ford-F100?page=1
81 F100 style side 300 six/SROD parts truck -RIP
http://cars.grantskingdom1.com/index.php/1981-Ford-F100

Johns3524

Re: 300 Six Compression Ratio, Intakes, Heads, etc

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85lebaront2

Re: 300 Six Compression Ratio, Intakes, Heads, etc

Administrator

In reply to this post by Gary Lewis

Kind of hard to shoot a video while I am working on it, last time I looked I only had two hands and both will be in use.

Bill AKA "LOBO" Profile

"Getting old is inevitable, growing up is optional" Darth Vader 1986 F350 460 converted to MAF/SEFI, E4OD 12X3 1/2 rear brakes, traction loc 3:55 gear, 160 amp 3G alternator Wife's 2011 Flex Limited Daily Driver 2009 Flex Limited with factory tow package Project car 1986 Chrysler LeBaron convertible 2.2L Turbo II, modified A413

Gary Lewis

Re: 300 Six Compression Ratio, Intakes, Heads, etc

Administrator

Haven't heard of tripods?

Gary, AKA "Gary fellow": Profile

85lebaront2

Re: 300 Six Compression Ratio, Intakes, Heads, etc

Administrator

Yes, but the way the car is, I would be in the line of vision at least half of the time. Maybe I can con one of my neighbors into playing cameraman, then he could apply for a job at CNN.

Bill AKA "LOBO" Profile

Rembrant

Re: 300 Six Compression Ratio, Intakes, Heads, etc

In reply to this post by Gary Lewis

Question for the 300/6 experts on here:

Can a later 300/6 engine from a 1987-1996 pickup be swapped into a Bullnose and converted to carb? Are the blocks and heads the same, or are there different castings in the later years? What about the water pump and belt system? Can they be swapped back to a V-Velt?

I'm just curious, thanks! My experience is only with the SBF V8.

1994 F150 4x2 Flareside. 5.0 w/MAF, 4R70W, stock.
1984 F150 4X2 Flareside. Mild 302 w/ 5spd. Sold.
1980 F150 4X4 Flareside. 300i6 w/ 5spd. Sold in 2021.
1980 F100 4X2 Flareside. 351w/2bbl w/NP435. Sold in 1995

Ford F834

Re: 300 Six Compression Ratio, Intakes, Heads, etc

Administrator

Absolutely yes. An EFI straight six can be fitted with manifolds from a carb’d truck and a DSII distributor/ignition set up. If you also want to back covert the accessories from serpentine to V belt you can. The water pump turns the opposite way so you need to use the right one for the type of accessory drive. The long blocks are essentially the same for the purposes you are asking about.

SHORT BED 4-DOOR DIESEL: 1986 F350 4x4 under construction-- 7.3 IDIT ZF5+GVOD

STRAIGHT SIX 4X4: 1981 F150 2wd to 4x4-- 300 I6 close ratio diesel T19, hydroboost brakes, Saginaw steering

BIG F: 1995 F-Superduty under construction— converting to 6.9L IDI diesel ZF5+DNE2

Rembrant

Re: 300 Six Compression Ratio, Intakes, Heads, etc

Thanks Jon! That's what I figured, but wanted to make sure!

I was looking at the 300/6 engine frame mounts in the LMC catalog, and there sure are a lot of variations. There are different L&R mounts for 1980-1984, then 1985-1988, then the same mount for both left and right from 1989-1993, and then different L&R mounts again for 1994-1996.

If the blocks are basically the same, I guess then that there must also be a few variations of the engine mounts (the mounts between the block and the frame mount(s)?

This is what was causing me to think that there may have been different blocks in the later trucks...

And another question:

There are a couple 300/6 trucks at the local junkyard. One a 1996 f150, and the other I a 1992 F350. The engines are completely intact in both. Unfortunately, like all junkyard stuff, I have no idea on the condition.
Are they easily rebuildable? Usually just typical stuff like any V8 engine with regards to re-bore and crank bearings, etc?

Gary Lewis

Re: 300 Six Compression Ratio, Intakes, Heads, etc

Administrator

The '96 may be EEC-V with OBD-II, SEFI, MAF, etc. The basic shortblock is the same, but it would make a nice upgrade if everything is there.

Gary, AKA "Gary fellow": Profile

Ford F834

Re: 300 Six Compression Ratio, Intakes, Heads, etc

Administrator

In reply to this post by Rembrant

The straight six is a very good rebuild candidate as long as it has not been absolutely clobbered by the previous owner. Because of their zero balance inline design, they wear very evenly. I’ve rebuilt three of them, and none of them had and ridge in the block. My dad’s 240 had about 300K on it when we pulled it and you could still see the cross hatching on all cylinders. It was clattery which was why we decided to rebuild it, but turns out it probably just needed lifters and top end freshening. Of course we went ahead and freshened the whole engine, but it didn’t need to be bored or machined or any of that. With the side cover lifter access, straight row of pistons, and geared timing set they are a pleasure to work on. If you are planning to convert to carb/DSII I would pick whichever truck looks like it was cared for the best. If you think you might want the EFI then the ‘96 SEFI would be nice to have.

1986F150Six

Re: 300 Six Compression Ratio, Intakes, Heads, etc

Administrator

The F.I. blocks [1987+] had 2 additional studs for mounting the individual exhaust manifolds. These were to prevent the manifolds from slipping over time since they were not attached to the log intake manifold. Also, the F.I. blocks did not have a mechanical fuel pump.

Frank Wyatt

Re: 300 Six Compression Ratio, Intakes, Heads, etc

Not only do they not have a engine mounted mechanical pump, some/most? do not have the hole in the block for said pump. However, the location does have the unthreaded holes for the pump already in the block. You just have to tap the threads and use a fuel pump gasket as a template and cut out the hole for your pump. Or use an electric pump, which I personally don't like them though.

1981 F 150 Custom 300 ci with a fully rebuilt 1968 240 head Carter YFA T-18 3.25 9" rear 2WD
dual gas tanks
1990 Lincoln Town Car 5.0 AOD
Home town Mc Kenzie, TN

85lebaront2

Re: 300 Six Compression Ratio, Intakes, Heads, etc

Administrator

In reply to this post by 85lebaront2

Couldn't get a cameraman for the Corvair carb adjustment routine. It is finished and awaiting being fetched.

Here is a picture from a FB group, "longroofs, the wonderful world of station wagons" It is the Pontiac 215/230 OHC engine with a factory optional Quadrajet. Note the carburetor orientation, primaries are outboard so mixture distribution is as even as possible.

Bill AKA "LOBO" Profile

Gary Lewis

Re: 300 Six Compression Ratio, Intakes, Heads, etc

Administrator

Glad you got the 'Vair synch'd. Bet it sounded cool.

I remember that Poncho engine. My best friend had the little brother - OHC but no QJet. It ran quite well, but I heard that the ones with the higher compression and the 4bbl ran very well. In fact, about as well as the 326 that was also an option.

I've forgotten what the CFM rating on that little Rochester was. 500? With the tiny primaries that would make a good one for a 300.

Gary, AKA "Gary fellow": Profile

85lebaront2

Re: 300 Six Compression Ratio, Intakes, Heads, etc

Administrator

Yes it does, since it has the dual exhausts it does a passable imitation of a Porsche 911. Considering the 1965-68 Corsa 140s were called the "poor man's Porsche". it is not surprising. Nasty little snarl when you open all 4 carbs.

Bill AKA "LOBO" Profile

Gary Lewis

Re: 300 Six Compression Ratio, Intakes, Heads, etc

Administrator

I had a fraternity brother in college that had a '65 Corsa, so got to hear that snarl. Loved it!

Gary, AKA "Gary fellow": Profile

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