Searching for Builds / Combos

[Max_Effort]

Hi,

I’ve searching around this forum looking for engine builds and combos for the 300. I seem to get a massive amount of search matches, but not really finding builds and combos.

I’m in the planning stages of a personal project, the 300 in a 1983 F150 4x4. I’m interested in NA builds and modest boost turbo builds. I’m looking for an increase in power and torque across a wide RPM range, with good drive-ability.
If this can be done NA at a reasonable cost, it will probably go that way. If not, then the modest (6-10 PSI) boost route.

A good start for me would be some direction to suitable build threads or examples of these types of combos. Then I can ask more specific questions.
TIA!

[pmuller9]

The stock cylinder head does not support a lot of power past 3500 to 4000 rpm so if you want a 300 six with a wide power band that problem needs to be addressed.
The head gets larger valves so the throat can be opened up and the rest of the work focuses in the bowl area.

My last build was designed to have a good power band from 2000 to 5500 rpm.
The head received SBC 2.02" intake and 1.60" exhaust valves (4.91" length) along with a CNC port job. A 1.94"/1.6" valve combination does just as well.

Intake port

Exhaust port

The head was drilled and tapped for 7/16" studs and BBC roller rockers.
Your head has pushrod guide slots in the head and will not need pushrod guide plates shown below.

[pmuller9]

Since we wanted to turn some decent rpm for a 300 six it was decided to use the 6.8" long 240 six rod to reduce piston weight and piston side loading.
The 1965 to 1968 rods do not have the oiling hole in the large end which can be a point of rod failure plus the early rods have a smaller 9.12" pin rather than the later 9.75" pin. Connecting rod forging number found on the lower beam is C5AE.

We were able to reduce piston and pin weight from the stock 819 grams down to 574 grams.
Custom pistons are forged 4032 alloy from Autotec. Dish volume was selected for a 9.75:1 compression ratio.


The 240 rods had the beams polished, shot peened and the rods were resized with ARP bolts.

[pmuller9]

Every edge on the block was radiused and all casting lines were ground flush.
All flashing was ground off the block especially the curtains found in the cam tunnel.
There are also pockets of sand and iron in the crankcase that need removed.

ARP head and main cap studs were used. The one main stud interferes with the oil pump.
A .060" aluminum spacer was required under the oil pump along with some grinding on the oil pump body and the top of the stud.


The rest of the build includes:
Hedman street headers
Intake for a 4 barrel carburetor. The Offenhauser "C" is recommended
Quick Fuel HR 650 Carburetor
Jones Cam. .050" duration 232/232, Advertised duration 288/288, .534" lift with 1.6 ratio rocker, 112* LSA.
DS 2 distributor with MSD 6AL ignition.

Owner reports plenty of power from 2000 rpm and 18 mpg on the highway at 70 mph during last trip from Spokane WA to Boise ID.
It's in a 1977 2wd pickup.
I'm waiting for WOT report after 500 mile break in oil change.

[Max_Effort]

The stock cylinder head does not support a lot of power past 3500 to 4000 rpm so if you want a 300 six with a wide power band that problem needs to be addressed.
The head gets larger valves so the throat can be opened up and the rest of the work focuses in the bowl area.

My last build was designed to have a good power band from 2000 to 5500 rpm.
The head received SBC 2.02" intake and 1.60" exhaust valves (4.91" length) along with a CNC port job. A 1.94"/1.6" valve combination does just as well.

Intake port

Exhaust port

The head was drilled and tapped for 7/16" studs and BBC roller rockers.
Your head has pushrod guide slots in the head and will not need pushrod guide plates shown below.

Thanks, who has the CNC program? Is it just for a new casting? What is the CSA, flow and velocity when it’s done?

Most likely I’ll be hand porting the heads. Are then any photos on this site of well done hand ported heads. I’m interested in CSA, bowl shapes, throat percentage, short turn radius, valve job that has proven to work well.

I’ve been reading here that the BBC rocker swap is common. Do the stamped steel 1.72 ratio (Stock BBC) work out?

[Max_Effort]

Since we wanted to turn some decent rpm for a 300 six it was decided to use the 6.8" long 240 six rod to reduce piston weight and piston side loading.
The 1965 to 1968 rods do not have the oiling hole in the large end which can be a point of rod failure plus the early rods have a smaller 9.12" pin rather than the later 9.75" pin. Connecting rod forging number found on the lower beam is C5AE.

We were able to reduce piston and pin weight from the stock 819 grams down to 574 grams.
Custom pistons are forged 4032 alloy from Autotec. Dish volume was selected for a 9.75:1 compression ratio.

What is the compression height of those Autotec pistons?
Any good sources for used 240 rods? (eBay wasn’t too promising at the moment)

[Max_Effort]

Any using 351W pistons? Pistons used in the lightning engine, are similar comp ht, lighter and a better ring pack. Rods would need to be bushed down.

[pmuller9]

C-Tech once had the CNC program but it is no longer available anywhere that I know of.
Superflow 110 @ 28 inches.
Lift, I, E
.100, 59, 47
.200, 113, 87
.300, 160, 120
.400, 192, 145
.500, 204, 163
.600, 212, 178

The Autotec piston CH for my build was 1.190". It can be 1.200" if the block deck only needs a small cleanup cut.

It is hard finding a good set of six 240 rods. It can take as many as 2 sets to find 6 good cores.
The source I used to use for cores will only sell finished remanufactured rods.
The best bet would be to post in the wanted section of this forum.

Isn't the lightning engine a 3.55" bore?

If you have to bush the rods to use a forged 351W piston, it is as cheap or cheaper to use the Autotec piston and get the ring set you want along with the correct CH and dish volume.

If the 351W piston set that it being considered has an offset pin then only 4 of the 8 pistons can be used on the 300 six unless the piston top and dish is symetrical and the piston can be used in either direction.

[sandboxer]

What hp/tq numbers did you come up with, pm? Please let us know if your client gets some dyno numbers.
Thanks

[pmuller9]

What hp/tq numbers did you come up with, pm? Please let us know if your client gets some dyno numbers.
Thanks

I moved from WA state before I had a chance to dyno the engine.
I was expecting 320 hp at 5200 rpm and 350 ft/lbs at 3600 rpm at the flywheel.
I will encourage the client to do a chassis dyno and report back.

[pmuller9]

We need others to report their combinations also.
I went first to get the thread going.

[BigBlue94]

Lightning engine is a 5.8L with no major changes other than cam and intake.

Many people use 351w pistons, and if you are at .050 over, you can use 390 pistons, which don't require rod bushings.

I have a build in progress.

https://fordsix.com/viewtopic.php?f=2&t=78031

[clintonvillian]

Pmuller,

Is Ctech no longer doing the ported 6 heads? What happened?

If not, I guess I got lucky then......

[pmuller9]

Is Ctech no longer doing the ported 6 heads? What happened?

They aren't doing CNC porting at this time. Arnie will do a manual port job if needed.
Don't know if this is permanent or temp.
Can't really tell you what happened.

[Superbum]

My 300 is a .020 over with 9.2:1 compression ratio mildly ported head with si 1.94 and 1.60 valves. A Clifford 4 barrel intake with a Holley truck avenger carb. Then I chose was the lunati cam 219/227@.050 and .499/.522. It ran 150hp at the wheels in a 1982 bronco with a np435 a 9" and 31" tires. The torque curve was 300 ftlbs at 1000rpm up to 400ftlbs before the fuel pump could not keep up.

[deere114]

It makes 400ftlbs but only 150hp?

[Superbum]

I know I expected a lot better but as I said the fuel pump could not keep up. I'd like to try it again after I upgrade to a better pump.

[Wesman07]

There are a few things that do not add up with those numbers. Are you sure the guy running the dyno knew what he was doing?

[Superbum]

I know I thought the HP number was low especially for the amount of work that went into the build. I was also dissatisfied with the Dyno work being that there was no printout I only had his word to go on.

[Wesman07]

Superbum:

Your friends dyno has to be wildly out of calibration or there was some serious user error.

1) It is not likely to pass 200ft/lb @ 1,000 rpm with a cam that size and short intake runners.
150ft/lbs maybe...

2)You would break 150 hp if you hit 400 ft/lbs almost anywhere in the power band. Above 2,000 rpm to be exact.

(RPM * T) / 5252=HP
https://spicerparts.com/calculators/hor ... calculator

[Superbum]

First off who said this guy was my friend. I all ready expressed my dissatisfaction with his work.
#1 if you use the calculator you yourself have posted you can see that it only takes 57.1 HP to put out 300 ftlbs of torque. I can tell you just by driving the truck it definitely does. That said a Clifford intake is not a short runner intake. I'm not sure why you would think it is unless you want to compare it to a tunnel ram.
#2 yes 400ftlbs @2000 rpm would only make 152hp but if that is where the fuel pump falterd it couldn't make any more HP than that.

[Max_Effort]

I've decided to go turbo/megasquirt on the build. I want something a little different and I like the stout torque numbers I've been reading about.

I just picked up an EFI engine core. I figure it's a lot better start because of the EFI bits it has already. Not sure what year the engine is. It was listed as a 96, but another guy there said an 89. It has 44k on it and is fully dressed for a reasonable cost.

Do you folks have any tips to ID the year?

It will get a full tear down and cleaning. Then I'll, PT, mag, measure and sonic test it. Hopefully it's a solid core.

[pmuller9]

What head will you use?

[deere114]

If there's an 02 sensor in the exhaust manifold it's a 96' 97-95 where in a small cross over right before the cat. 96' trucks were ob2 maf systems. The intake pipe to the throttle body was a Y merging the two pipes off the throttle body to one larger pipe which housed a maf sensor right before the air box. The intake manifold was also a little different shaped on a 96. More of a < shape versus the [ shape of the 87-95. I don't think either intake manifold is any better then the other, my guess they changed the casting for reason related to its manufacturing. The 96' engine would have hyper pistons with a metric ring pack, these pistons are stronger then the cast units in other 300's. That's really the only advantage of starting with a 96' engine. If your changing pistons it really doesn't matter which efi 300 you start off with.

[Max_Effort]

If there's an 02 sensor in the exhaust manifold it's a 96' 97-95 where in a small cross over right before the cat. 96' trucks were ob2 maf systems. The intake pipe to the throttle body was a Y merging the two pipes off the throttle body to one larger pipe which housed a maf sensor right before the air box. The intake manifold was also a little different shaped on a 96. More of a < shape versus the [ shape of the 87-95. I don't think either intake manifold is any better then the other, my guess they changed the casting for reason related to its manufacturing. The 96' engine would have hyper pistons with a metric ring pack, these pistons are stronger then the cast units in other 300's. That's really the only advantage of starting with a 96' engine. If your changing pistons it really doesn't matter which efi 300 you start off with.

Thanks, it's definitely an 89. It has the features mentioned. I was looking at it, comparing to what you wrote then saw the valve cover sticker in the rear 12-7-88 doh...

[Max_Effort]

What head will you use?

Prob the EFI head.... its more convenient to build the complete core engine and keep the truck running until it's time to swap.

[pmuller9]

I'm sure you know this, a lot of the used EFI heads are found to have cracks in the chamber area and else where so be sure to mag the head.
What rpm range do you want the power to be at?

[Max_Effort]

I'm sure you know this, a lot of the used EFI heads are found to have cracks in the chamber area and else where so be sure to mag the head.
What rpm range do you want the power to be at?

Yes, I'll PT and mag the head b4 any work.

I'm just looking for good average power and torque across a wide range. I don't plan on turning it much over 5k. An engine in this truck will spend the most time in the 1800-4000 RPM range.

I also don't want it sluggish from idle until boost comes on.

[88F15088]

I figured I would post my results here for comparison.

1988 F150
S5-42 5 speed manual
MegaSquirt EFI with decent tune by myself
Electric fan
Hedman Headers
EGR delete
Smog delete
Full custom dual exhaust from collectors to x-pipe, two cats and two glasspacks
Everything else is stock

Peak HP: 128 HP
Peak Torque: 259 Ft-lb