43 replies to this topic

[TK383]

350+hp, 1/4 times in the 10's @ 2200lb + driver.

 

That's off the top of my head, in a well set up LC/LJ with 5500+ stalled auto (trimatic) & 4.11+ gears & weight under 2400lb the newest head will run 10's, how far under 10.99 I don't have the stuff here (at home) to work out.

 

I've done the math on what is required to run a 9 with an aspirated holden 6 with a 9 port head - it's within the realms of doable, but far from easy.

[gtrboyy]

Makes you wonder just what is inside that sydney torrie doing 10.1's

[warrenm]

This head flows similar to my current head (this has a few more cfm), so with 4.88 gears, 4 speed, 26" tyre & 2650lbs, 12.1@109, so a high 11s shouldn't be a problem.

[TK383]

That torrie cracked a 9.9 the other week.

She'd be a lightweight tho, & a well developed race car, not a streeter that gets raced.

Best guess is it's making around 370-380hp.

It runs a clutchless manual - liberty I think.

Clutchless stick shifted Trans's like liberty & jherico are the most efficient drag racing trans's out there, they will often enable the car to run quicker ET's than the engine HP & terminal MPH would predict.

 

350hp with 2400lb = potential for 10.7 @ 124mph.

 

Attention to cam design, intake & exhaust runner lengths, chamber pressure recovery, flow at peak piston speed & inertia ram tuning can see quite a lot more hp produced than raw head flow suggests.

[TK383]

Next head, intake valve moved .060" towards the centre of the chamber, head moved over .060" on the block, 7mm stem Delwest Ti valves & I don't want to think how many hours on the grinder, mill & seat & guide machine, getting close to done with it, just intake manifold & sorting out the details with the valve train to go.

 

 

 

 

 

 

 

 

 

 

 

[LC-GTR-1969]

Looks the goods... Im ready to test it if you like- just send it over and I will let you know how it runs hahahahaha!

 

Great work. What did this one flow?

 

Have you worked out the difference in velocity with the divider compared to without?

Edited by LC-GTR-1969, 12 October 2016 - 12:49 PM.

[fenz]

Nice work as always.

 

How much difference does welding and reshaping the siameased exhaust port make.

Standard it is a bit of a shit shape as it steps out at the manifold face.

 

They running webbers with these heads??

[grumpy xu1]

I will be following this post with excitement, Tony your work is just incredible mate ! Always nice to look at would love to see some of the whole engine, wish i could afford to send you my engine. Gary.

[TK383]

Flow is on the previous page, it went 225cfm with very strong mid lift flow - thanks to the valves being significantly unshrouded.

 

Welding up the exhaust port at the face allows proper wave tuning, without the runners isolated there will be a weaker 'signal' & cross talk between runners.

 

Will be running 3x 45 DCOE webers set up for E85, likely I'll fit 40mm chokes in place of the stock 38mm chokes.

[grumpy xu1]

Be good to see if there was any torque or flow difference between the keel shape vane & the straight vane fitted to this latest head mate. Even if just for your knowledge, but i would think that a more round front profile would be at least a smoother flow if nothing else. & i think i would have to try different thicknesses & lengths. You have no doubt done this but i would assume that there would be different figures, that could be matched to a cam & engine's torque range. Would that be correct Tony? Gary.

[LC-GTR-1969]

any dyno updates from these heads? 

[basicgreen]

how they did it in the 80's

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[greens nice]

12 weeks till the 6 bunger nat's, how's this thing lookin?

[SA EH]

Subtle... much😊

[greens nice]

Gotta at least try to rally the troops!

It should run hard, I'm keen to see it

[greens nice]

Bump...

[I'm a Red Motor fiend]

I'm really hoping TK updates this too but he is real busy. He did my head not so long ago and that took a while. In fact I reckon he said that the dude he did this for hadn't even used it yet and was just sitting there.

Edited by I'm a Red Motor fiend, 24 December 2017 - 01:15 PM.