20 replies to this topic

[mandytory]

I have decided to go the stroker route with my engine. I have already purchased a Crane 286 cam which I would like to still use. The spec sheet says that for a 350 ci then reduce Rev range by 500 rpm. Would this mean I can use a lower stall torque converter also. Thanks for any input.

[rexy]

Possibly, but you wont know what converter to get until the engine is built and dynoed.

[yel327]

I'd get all your engine specs, cam, diff ratio, tyre size etc etc and fill out the converter query forms for one of the converter mobs to tell you what to buy.

 

Here is an example:

 

revised torque converter spec sheet.xlsx (multiscreensite.com)

 

Make sure it's all correct and you'll get the best recommendation they can give you. If you don't know yet what the compression ratio will be or what the heads will be or what the ci of the motor will be wait until you do, then get the converter sized.

 

Edit - Rexy beat me to it!

Edited by yel327, 16 January 2023 - 05:45 PM.

[mandytory]

Thanks Rexy and yel327. Was going manual with a T5 but with stroker crank, I have a reco TH350 that came with the car that should cope with extra torque. Really only after a nice street cruiser with good torque .

[gtrboyy]

What size stally & gears planned?

 

Decent comp etc probably use 3k stally lowest...a well built stally by someone who knows what they're doing will barely slip or be a pain.

[mandytory]

Car has a 9" with 2.73 gears. Have some 3.5s I was going to use with a 5 speed manual. Would prefer a manual but getting something that can handle the stroker torque is expensive when I have a Th350 here. Don't know much about converters hence the question. Car will be a weekend cruiser. Not interested in 1/4 mile times etc.

[Heath]

If you would prefer a manual, just put a manual in it. 

 

T5, TR3550, TKO500, TKO600, or TKX.

 

You won't look back.

[mandytory]

Yeah will eventually Heath, TKX sound good but will have to stick with auto for time being. Have a T5 but most say it won't handle stroker torque.

[Peter UC]

As long as you treat the gearbox with respect it will be ok, start beating on it and it won’t. So it depends how you intend to use it. Personally even if it does fail down the track at least you’ll know for sure if a manual is what you want before spending TKX money

[mandytory]

True Peter UC.My car is a uc hatch factory auto and have a reco Th350 . So not too much cost and hassle to use it and see if I can be happy with auto. With a th350 stroker 355 what would be best all round diff ratios, 2.73 or 3.55? Just remembered the Toyota R154 is also an option for manual. Like the overdrive for quick take off and lower cruising revs .

[yel327]

Remember in a Holden the 253 and 4.2 had a Salisbury but in a Torana the 5.0L used a banjo. Lots of other examples like in a Holden the 5.0L ran a TH400 but a Trimatic in Torana. It comes down to engine torque and vehicle weight, and how kind you are to it! As a weekend cruiser it might be a viable option for you. Remember it’s a 350ci engine, so will have more torque than a 304/308 with the same cam, heads etc. But plenty of decent output, heavier vehicles used a T5, like VK GroupA and some VN HSV’s etc. if it was mine and I had the stuff to fit the T5 I’d give it a go. Do those other boxes Heath listed use the same bellhousing etc?

Edited by yel327, 18 January 2023 - 07:38 PM.

[gtrboyy]

Work out what options are to go manual...if pricing not too far apart may as well go manual if it's what you really want.

 

Ford 6cyl t5 would be ok if you show some restraint.

[Shtstr]

I have decided to go the stroker route with my engine. I have already purchased a Crane 286 cam which I would like to still use. The spec sheet says that for a 350 ci then reduce Rev range by 500 rpm. Would this mean I can use a lower stall torque converter also. Thanks for any input.

What is the full specifications of the cam.
This is also required along with engine specifications like static compression ratio and rod length.
From that I can let you know how it will proform.

[Heath]

I doubt the T5 will give you any grief. They are pretty great gearboxes. 

 

Maybe not if you're putting slicks on it and trying to get it into the low 11's. But for general purpose hooning they seem excellent.

[Shtstr]

Just looked at the cam specs for the 286 cam. I personally wouldn't run it unless I was running high 10 to 1 static compression ratio.
If you are running 10.5 or less static I would go for the H226/314 2S-8 cam with the 108 LSA that is far better suited to a 350 355 engine. Providing you are using early heads. If not get one ground with same specs for the latter efi heads in those specs.
You will be very surprised at how well it will proform.

Edited by Shtstr, 22 January 2023 - 06:59 PM.

[mandytory]

Thanks for that Shtstr, I will look into that cam. Am using Brock heads and inlet manifold. Around 10 to 10.5 compression. A9l holden rods.

Thanks also Heath for feedback about T5 box.

[mandytory]

If I use A9l rods which I already have with a scat 355 crank and the H226/314 crane cam, which pistons would you recommend. Are Hyperteck dished or a d bowl type ok with 9.5 or 10.1 compression ratio.Or something else.

[Redslur]

Hypertech flat top with 8-10cc valve reliefs are the go.  You won't need forged unless you are treating it hard. Then you would want to upgrade the rods anyway. With flattops and a good deck height, you will get into the 10:1 + comp which the engines work well with. 

[Shtstr]

If I use A9l rods which I already have with a scat 355 crank and the H226/314 crane cam, which pistons would you recommend. Are Hyperteck dished or a d bowl type ok with 9.5 or 10.1 compression ratio.Or something else.

You would be better off with a flat top piston with valve reliefs.
Just remember to keep your quench down to a minimum to keep detonation at bay.
With iron heads you want to go no higher then 8 to 1 dynamic compression. With alloy heads you can increase that to 9.2 or 200psi cranking compression.
Jump online and look up dynamic compression ratio calculator.
I prefer the Wallace racing calculator.

[mandytory]

Thanks guys, that is great info, just what I wanted to know. Will keep going with my research.
Just wanting to understand what I need before I go to the engine machiner.

[76lxhatch]

With iron heads you want to go no higher then 8 to 1 dynamic compression.

Sounds a bit low, I get around 9-9.1 on the calculator (static 10.3). I run 91 octane fuel no problem, actually wish I'd gone with less dish on the pistons to get higher comp.