X-heads / 6 Barrel combo porting

[go-fish]

Just got word from my porter. Heads flowed around 240 @ .600”. Going to port match the six pack intake to the 1213 Fel Pro gaskets.

Trying to get a big discount on the FiTech 3x2 efi.

Engine will be a stock stroke 360. Cam will be a HFT in the vicinity of 222 - 224 @.050” and around a 110 lobe separation. Tremec TKO 600. 3.55 Dana.

 

[go-fish]

 

[Yellow Duster]

That's gonna be alot of fun to drive!

 

[RustyRatRod]

Camshaft is really tame, but that sumbee is gonna suck your eyes outta your head on the bottom end. It'll be a blast to drive!

 

[RustyRatRod]

That's gonna be alot of fun to drive!

I agree!

 

[rumblefish360]

I’d rethink the cams 110. Gain lots of torque with a narrow LSA and the intake lobe @ a 106/104.

If the trans was an automatic, I’d leave it be.

 

[replicaracer43]

If your not putting a .600 lift cam in it, I'd be WAY more interested to see what the .200- .500 numbers are.

 

[go-fish]

If your not putting a .600 lift cam in it, I'd be WAY more interested to see what the .200- .500 numbers are.

When I get back home from my trip I’ll go by the shop. He’s got it written down.

@rumblefish360 Now, I was under the impression that a wide lobe separation was forgiving on the manual trans shifts.

@RustyRatRod This is engine is for my Dad, 74, and never really had a car with anything more than an “RV” cam. He bought his 70 ‘cuda Gran Coupe with a radical 440. He doesn’t enjoy the engine/trans combo. He likes rowing gears and the 440 engine is effing mean! He wants a small block but wants more power than stock LA and less than the 440.
Arthur’s Duster (my ‘73 340/4-speed) has a cam in the same general specs and he loves driving that. The TKO that will go with this engine has a 1st 2.87; 2nd 1.89; 3rd 1.28; 4th 1.00; 5th 0.64.

 

[rumblefish360]

When I get back home from my trip I’ll go by the shop. He’s got it written down.

@rumblefish360 Now, I was under the impression that a wide lobe separation was forgiving on the manual trans shifts.

While there is truth to this, your throwing away a lot of low end torque for nothing creating a wussy engine.
When driving a manual trans engine with a tight LSA, it will require a tad more attention and a few more rpm’s to take off from a dead stop smoothly.

Do as you wish.

 

[go-fish]

While there is truth to this, your throwing away a lot of low end torque for nothing creating a wussy engine.
When driving a manual trans engine with a tight LSA, it will require a tad more attention and a few more rpm’s to take off from a dead stop smoothly.

Do as you wish.

I’ll definitely look at the cam selection more closely. Thank you.

 

[go-fish]

Heads are back

Lift----------Intake-----------Exhaust

.100 _______80________ 63.81
.200 ______134.4_______115.15
.300 ______187.7 ______161.42
.400 _______224 _______179.3
.500 ______236.8 _______190.7
.600 ______256.7 _______193.7

 

[72bluNblu]

Decent numbers on the heads!

I'd be careful with the cam if you're going to run 3.55's, especially with tall rear tires.

I ran 3.55's in my Duster for awhile, with a larger cam than what you're looking at, and 26" tires. I went with the 3.55's because with the 26" tires that was about the best I could do and still manage decent freeway speed without running around at 4k+ rpm all the time with the 833 4 speed I was running. Anyway, the 3.55's and clutch slip to take off got old after not very long at all. Sure, if you drive it like you stole it and drop the clutch at 3k all the time it's fine, but that doesn't exactly work in traffic.

Anyway, my set up is with a stock stroke 340, .060" over, with a Lunati HFT with duration @ .050 (Int/Exh): 234/242; Gross Valve Lift (Int/Exh): .513/.533; LSA 110. Lunati recommends 3.73's, all I can say is I'm a lot happier with my current 4.30's, 27" tires and T56 Magnum. Advertised RPM range is 2200-6400, I think 2200 is a little optimistic. Below 2,500 there isn't a ton of power. Over 3k and she's a beast, pulls all the through to 6k+.

Compression is 9.8:1 with 308 heads, ported and flowing what you see below. Just the intake side, I don't have the exhaust numbers

Lift	Intake Flow CFM@28”
0.200	165.7
0.250	184.3
0.300	202.2
0.400	243.8
0.450	258.7
0.500	263.9
0.550	257.2
0.600	252.7

So anyway, long story short if the plan is 3.55's and any rear tire 26" or taller you want a smaller cam than what I run for sure, unless you like pedaling to get it going.

 

[go-fish]

Decent numbers on the heads!

I'd be careful with the cam if you're going to run 3.55's, especially with tall rear tires.

I ran 3.55's in my Duster for awhile, with a larger cam than what you're looking at, and 26" tires. I went with the 3.55's because with the 26" tires that was about the best I could do and still manage decent freeway speed without running around at 4k+ rpm all the time with the 833 4 speed I was running. Anyway, the 3.55's and clutch slip to take off got old after not very long at all. Sure, if you drive it like you stole it and drop the clutch at 3k all the time it's fine, but that doesn't exactly work in traffic.

Anyway, my set up is with a stock stroke 340, .060" over, with a Lunati HFT with duration @ .050 (Int/Exh): 234/242; Gross Valve Lift (Int/Exh): .513/.533; LSA 110. Lunati recommends 3.73's, all I can say is I'm a lot happier with my current 4.30's, 27" tires and T56 Magnum. Advertised RPM range is 2200-6400, I think 2200 is a little optimistic. Below 2,500 there isn't a ton of power. Over 3k and she's a beast, pulls all the through to 6k+.

Compression is 9.8:1 with 308 heads, ported and flowing what you see below. Just the intake side, I don't have the exhaust numbers

Lift	Intake Flow CFM@28”
0.200	165.7
0.250	184.3
0.300	202.2
0.400	243.8
0.450	258.7
0.500	263.9
0.550	257.2
0.600	252.7

So anyway, long story short if the plan is 3.55's and any rear tire 26" or taller you want a smaller cam than what I run for sure, unless you like pedaling to get it going.

Thanks for the input.
This engine build is going to be a replacement in my Dad's 70 'Cuda. Currently 440 / auto. The rear is a Dana. My 70 'Cuda is donating it's TKO (old Keisler kit) and since it is a small block and Dana (S60) we can even use the driveshaft. I am going to be using the T56 that I have for a defunct Valiant project. Currently his car has 295/50's (26.8") but he wants to go with a 255's (27").

TKO ratios:
First Gear Ratio: 3.27:1
Second Gear Ratio: 1.98:1
Third Gear Ratio: 1.34:1
Fourth Gear Ratio: 1.00:1
Fifth Gear Ratio: 0.68:1
*in post #1 I mistakenly referred to the trans as a TKO-600

Tremec's calculator says the 1:1 cruise speed will be 50 mph on a 27" tire. With the .68 OD he will be at 73 mph. That is going to be perfect for him as he lives in an area where he will predominately drive 55 for about 10 miles, hit the interstate for about 5 miles, and then he's in town. If he wants to drive to Oklahoma City it's 20 miles on the interstate.

My 'Cuda has the same gear ratio, the 408 has a 224/228 @.050 cam, and currently has the TKO in it. When I had it on the road it drove beautifully. I have 335/35-19's on the car and their at 26.89"

After taking into consideration Rumblefish's cam recommendation I am still leaning toward a cam like what's in my 408 for my Dad's 340 but just a touch less at ~218-222 @ .050". Dad wants a stock stroke and mine is a 4" arm. We are still working on finding him a 340 at the moment but it sounds like @coloradohill has one that may be just right with this build.

 

[Killer6]

With that 1st gear ratio, all this fretting over take-off driveability is silliness, the mid-220's You had in mind with a 106-107 LSA will be great...

 

[cookietruck]

also with a .64 fifth gear, i would choose gear ratio based on what i wanted the rpm to be in 5th at cruise. atleast a 3.91 gear, maybe even a 4.30...depends on tire diameter...

 

[go-fish]

also with a .64 fifth gear, i would choose gear ratio based on what i wanted the rpm to be in 5th at cruise. atleast a 3.91 gear, maybe even a 4.30...depends on tire diameter...

The TK-500 has a .68 5th. My belief is that the 1st gear ratio of 3.27 and a 3.55 rear gear is great for taking off without having to touch the gas. I drove the trans and rear gear for a couple of years and it was very driver friendly. Dad's rear gear is 3.55 as well and he is getting my trans.
The differences will be that my engine is a 408 with Hughes ported Edelbrock's, 9:1 cr with a D1-SC Procharger. Dad's engine will be a 3.31 stroke, similar cam, similar compression. The Procharger shouldn't affect the take off as it isn't making boost at the rpm's that you would normally engage the clutch under normal operation.

Tremec's calculator says the 1:1 cruise speed will be 50 mph on a 27" tire. With the .68 OD he will be at 73 mph.

Forgot to mention that the RPM put in the calculator was 2200 rpm.

 

[rumblefish360]

@go-fish

My son just learned to drive a manual trans 4 spd in a ‘91 W-150. The first cam wiped a lobe and lifter. I figured a nice wide angle would be hood for him to get started on. He has is not the most dexterity or quickness in learning on the fly.

The only cam I had available in my stable was a thumper on a 107. He stalled in only a few times and he’s on his way! I just told him to rev it up to about 1200 and slowly release the clutch pedal until it catches on, etc…

Bottom line, He’s doing good with it.

 

[rumblefish360]

 

[go-fish]

Cerakote turned out nice.

 

[purpledart]

How did the fitech setup turn out? I was looking at doing that to my 340 powered 67 dart gt vert. Seen a lot of bad reviews about fitech. Called yesterday to ask if their instructions were correct that you can't use Al 6 or 7 boxes. Waited on line for 17 min to get a representative only to be told that my AL6-2 MSD box would work and the instructions were wrong. Told the rep I am not impressed waiting so long for service questions only to find out their instructions sheet was incorrect.

 

[purpledart]

How did the fitech setup turn out? I was looking at doing that to my 340 powered 67 dart gt vert. Seen a lot of bad reviews about fitech. Called yesterday to ask if their instructions were correct that you can't use Al 6 or 7 boxes. Waited on line for 17 min to get a representative only to be told that my AL6-2 MSD box would work and the instructions were wrong. Told the rep I am not impressed waiting so long for service questions only to find out their instructions sheet was incorrect.