Trickflow 170 heads

[Clevo120Y 815]

Some Trickflow 170 heads got delivered today for me to port for Wayne (Performance Carb Tune Perth) to run on a new 302w. Here are the specs of the engine that he sent me today.

 

This is the list of bits
STD 302w block 4.030" bore
0 deck height
Head Gasket will be either .030 or .040 depending on final comp
Eagle neutral balance Crank
Eagle I beam rods
Probe +8cc Dome top pistons
Lunati solid roller
Advertised Duration (Int/Exh): 273/279
 

• Duration @ .050 (Int/Exh): 243/249
• Gross Valve Lift (Int/Exh): .616/.624 ( but using 1.7 rockers so its 654/663)
• LSA/ICL: 110/106
• Valve Lash (Int/Exh): .016/.016
• RPM Range: 2500-7000

Victor jnr intake
Will be all motor no NOS or anything else and will be on E85
Want about 13.5:1 comp
And will be in my XL falcon with 4200rpm stall and 4.11s
Use will be street/strip

 

 

So I put the head on the bench today to give me a base line to work with, I have to say the flow figures are a fair way from the advertised figures given by the manufacturer, I do have to take into account a bit of carbon buildup but not much, also I calibrate my bench to read a little low as to not give bullshit flow figures, I rather my bench read low than promise something that isn't there.

 

                        intake                  exhaust

 

50                    30.32                   18.62

100                  61.09                   46.54

150                  93.39                   66

200                  122.5                   83.3

250                  147.15                 100.8

300                  179.26                 118.64

350                  201.5                   133

400                  216.08                 145.43

450                  232.17                 154.26

500                  242.15                 159.56

550                  243.11                 165.04

600                  233.27                 169.88

650                  236.19                 173.53

700                  233.34                 177.9

 

So my main aim is make the ports stable all the way to max lift and obviously gain some flow as well. I will be starting these heads mid next week as I'm just doing a set of L67 heads and manifold for a supercharged V6 engine at the moment then straight into these. I will keep you lot updated as I go

[NZXD 2,328]

Wicked, some Windsor gear, I'll be watching closely.

[ando76 4,354]

how good are the low lift gains - flow doubles every .100 lift from 100 - 300.  with a roller cam WOW off the bottom this thing will be wild.  Head sort of slows from there and falls away quickly which is surprising.  I wonder whether the heads are intended for the street/strip market???

 

I'm sure a bit of attention in the bowl and mid intact section will net some gain in the high lift.  I'll be watching this one. 

[Trev Vaa 1,185]

this thing is going to be a little power house.....

head flow figures seem low, kind of surprised he didn't just sell the heads and buy some CHI 185s to suit a windsor....

 

what sort of hp/tq are you expecting from this combo?

[ILIED 316]

I'm surprised people arent jumping for the P38s

[Clevo120Y 815]

I agree that the heads are suited to the hot street market and would be brilliant on a 550 lift cam chasing great mid range power.

I hope the engine goes around 520hp and 430ftlbs and the crank, this is if I can get the flow with the manifold on up to were I want it to be.

[Clevo120Y 815]

This is a bit of a budget build with stuff he already had, I'm not charging much to give them a tickle so outlaying more cash for new heads wasn't really needed. Wayne has blown combos for racing and stuff like that so this is just a "milder" combo for the street.

[Trev Vaa 1,185]

p-38s will suit the larger cube windors chaise, the intake runner is 240cc on them, thats bigger than a 4v intake runner.

awesome head though. its almost worth building a windsor to use them

[ILIED 316]

Fair enough, I didnt see their volume

[Clevo120Y 815]

I will put some pics up soon but the intakes now go 263cfm at just over 600 lift, with gains through out the lift range. I get the manifold this week which is the most important part to get to flow the numbers to crack that 500hp mark with this 302.

[NZXD 2,328]

That's a good gain, considering it dropped off before 600 previously. Good work!

[Clevo120Y 815]

Yeah that was the main aim they start to drop off again at 650 now but still has 259cfm at 650. I would need to fill the floor to get the stability over 650.

[Clevo120Y 815]

Here are the final flow figures for these heads, next is the manifold. I will post pics when I sort my camera.

 

                IN              EX
50            33.22         21.4
100          68.19         48.12
150          103.64       72.75
200          132.93       90.46
250          160.94       107.67
300          182.46       124.74
350          202.1         140.6
400          224.79       154.6
450          244.04       160.21
500          259.19       169.93
550          267.07       174.89
600          269.66       181.24
630          271.11
650          266.39       184.5
700          250.61       190.2
 

[Clevo120Y 815]

Intake manifold pics, when I get the heads back I can port match them and finish the final taper in the runners.

 

[Trev Vaa 1,185]

good improvement dude.

still think it may hold it back a bit, but you have to work with what you have and you have made a MAJOR improvement over what it was before so good on you.

 

have you measured the port volume post porting? would be curious to see the size difference pre n post. assuming they were 170cc to start with.

[Clevo120Y 815]

Cheers mate, they should crack 500hp which is Waynes target as long as I get the manifold right and flowing well with the heads. You know what, I didn't bloody measure the volume before I started and now I'm kicking myself but I will measure the volume when I get them back.

[Trev Vaa 1,185]

were they CNC ports? or just cast? if they're CNC id expect them to be within 1 cc either way of 170...

[Clevo120Y 815]

Just cast mate, so probably smaller than 170 to start with.

[Clevo120Y 815]

some pics of the ports.

 

Intake

 

 

exhaust

 

[slydog 7,873]

Fuck your good at that bro...I don't have the restraint or control to do what you do.

[Clevo120Y 815]

Thanks mate, I'm getting better, the ports are slowly looking nicer the more heads I do. Still a beginner really but starting to get the touch

[n00bus m@x1mus 465]

Interesting work on that intake, Do you find that knife edge up the back of the valve guide steadys it much? And im guessing its aiming 180 degs away from the direction of the runner? Act like a hydrofoil as such?

[gerg 10,871]

Interesting work on that intake, Do you find that knife edge up the back of the valve guide steadys it much? And im guessing its aiming 180 degs away from the direction of the runner? Act like a hydrofoil as such?

Not an expert by any stretch but that teardrop shape is the most aerodynamically efficient of all and is used on the wings and fins of aircraft as well as on various parts of racing cars... I would guess that the extended trailing edge stops turbulence behind the valve guide and stem and gives a cleaner stream into the cylinder.

[n00bus m@x1mus 465]

Id imagine so too, How he gets it there is another question LOL long burr and come in thru the intake port?

[Clevo120Y 815]

I can't take credit for the shape behind the valve stem, it is cast into the trickflow ports I just reshaped it because it's a pretty rough casting. Gerg is spot on with the reason it's there, it also acts a fuel shear. I use 6in long burrs.

1 thing I did discover with this head is the dramatic affect the valve shape has on the flow, a couple of valves were bent so we ordered a set of Manley race master valves, when I tested the heads again I lost flow everywhere, 10cfm in the lower lifts and 15cfm in the higher lifts. Comparing the shape of the stock valve with the manley I could see that the manley was a flatter tulip shape on the back of the valve. A bit of a search and the stock valve has a 12 degree tulip and the manley had a 10 degree. A change to the Manley flow master valves which have a 12 degree tulip bought all the flow back. So such a small difference can have a dramatic effect.