cutlassefi

Based on my current info, it looks like I'll be able to offer a SBO Stroker kit by this fall.
It will consist of a 3.875" stroke 5140 forged crankshaft, Eagle 6.125 I-beam centered rods good to 700hp. Piston choices will be numerous, going from very good to even better. Target price for this kit is $2495.00. That includes the bearings, pistons and rings as well as the rods and crank.
This stroke/Rod combination has the most available off the shelf piston choices of any combo in this stroke range. That's why the change in stroke. A 4.125 bore will yield 414ci, enough cubes to make the SBO a contender in any performance build.

All comments are welcome. Thanks gentlemen.

olds 307 and 403

Good price and over 400 ci. Those parts should take more than the block will handle. What are you planning as offering for the base piston/ring combo? Awesome as always Mark!

cutlassefi

The SRP Professional series would most likely be the base piston. It's a lightweight 4032 forged piston with a 1.2, 1.5, 3.00 ring pack. They would come with coated skirts as well. A quality piece no doubt.

wr1970

It is great to have more choices.

gear head

So, does this mean that the 4.00" stroke small block crank isn't happening?

cutlassefi

No not at all. The first batch are all 4.00". Should have those in about 5 weeks.
But moving forward I think the slightly shorter stroke may be more desirable because of the better off the shelf piston choices. And at 3.875 that's just about a half inch increase in stroke. That's still pretty hefty imo.

olds 307 and 403

Those 4" are 4340 material, aren't they Mark? Very nice to have the two options, that 5140 crank will no doubt outlast any girdled gas 350 block. That crank, even with the Honda rod journal is still a .275" gain with better material and makes over 400 ci. What is the weight difference compared to the 330 crank?

cutlassefi

Actually I have three each coming, 4340 and 5140.
Weight should be about 54#. But even the 5140 will be about 20% stronger than a 330 crank.

olds 307 and 403

Good to hear, the 330 crank will out live the block as is. I should weigh my 330 stoker crank but I am pretty sure it is a few pounds heavier. Awesome as always.

gear head

Sweet, I applaud your efforts in bringing more options to market.

Kalle

Sounds great... maybe late 2018 its something for me.
I´ve got a well hung early 350 Block in my shelf. The old internals are shot anyway.

cutlassefi

I'll be building one as soon as I get everything. Should make 500 or better and be very street-able.
My build will have aluminum heads, fuel injection and a roller cam. But your build doesn't have to break the bank. You could easily do a carbed, flat tappet build with big block iron heads and make very respectable power. Plus you'll be able to spin it up higher than your typical big block.��

OldSoldier

Most excellent! This opens up lots of options. I'm also in the EFI/Al heads/Roller cam boat for one stout SBO.

cutlassefi

Update;
5140 cranks should be here in the next 2-3 weeks. My filled and ported Procomps are having a minor reworking so hopefully, hopefully, I'll be putting something together in the fall for testing.
Compression will be approaching 11.0:1 as I'll be tuning for both 93 pump and E85. Should be interesting.

McGee68

Subscribing!

76olds

I'm going to follow along here as well, I've been wanting a nice 350 build for several years now without breaking the bank.
I'd really like a nice 350 build with 414 cubes under the Christmas tree this year.
Thanks for bringing more options to the table for us SBO guys Mark!!
Put-r-ther
Eric

AZ520

Subscribing! Will you be offering a lower compression, pump gas combo?

Alex72cutty

Subscribing

cutlassefi

Yes I will.
Actually the plan is to offer the 3.875" (414c.i. with a 4.125 bore) stroke crank with various pistons to be used with a BB head. With that combo you could easily obtain 9.75:1 with off the shelf pistons.
First batch of cranks has been delayed a bit but should still be here by the fall.
I'll keep you all posted. Thanks.

cutlassefi

Here's a 3D drawing of the crank.

wr1970

I am amazed how the mods still don't move these type threads to the high performance forum. I am even more amazed the op doesn't understand the importance after all he is a vendor. Here comes the delete my post cops. Cool that you posted the 3d drawing Mark.

ajr2820

I am interested in this kit. Is it available yet? What type of machining, if any, is required on the block?

cutlassefi

I'll have a 4.00" stroke crank available on or about the first week of November. Shoot me a email at fastone01@hotmail.com and I can give you the details.
Thanks!

oldsmobiledave

How much more is your stroker kit with the 4.00" crank in place of the 3.875" options?


Thanks

cutlassefi

Crank and rods are the same price as a 3.875. Pistons are about $100 more however.

cutlassefi

First batch of three is here!! Yay!!

OldSoldier

Sweet! Did you get a chance to measure it with a micrometer?

Josh Trail

Hey, what's the web site for your business or phone number I can call about purchasing your stroker kit?

cutlassefi

Yes I did, and it was just like I asked, on the low side.:-)
Josh - email me at fastone01@hotmail.com, I'll shoot you my phone number.

oldsmobiledave

Mark


How about an update on these stroker kits.


Any 4.00" stroke builds on the horizon?

cutlassefi

Yes, mine. Block is done, rotating assembly is done and balanced, heads are done.
Just waiting for my intake to be finished in order to start mocking things up. It’ll be 434ci. According to Pipemax should make upwards of 600hp.
Interest on this first batch of cranks has been Lukewarm at best so I’m holding off on doing another batch right now. We’ll see if the interest level picks up once mine is done.
Thanks.

OLDSter Ralph

Subscribing........

cutlassefi

Not sure what that means but thanks!
Here are a couple of new pics, everything clears so moving ahead.

76olds

I think you've sparked interest in many here Mark! That means a lot to all of us I'm sure
It's been a long time coming, we are very fortunate to have you on this site.
Your willingness to spend time," YOUR TIME" to benefit all us SBO guys.
The economy is at the beginning of the next BOOM !
For those of us that have been sitting on the fence wondering which way to go with our engines, you have turned the light on at the end of the tunnel for many of us.
It means many of us will be dropping in the Potent Oldsmobile Power in our SBO's that you are delivering for us
That means so much for so many of us
Cheers Mark!
Eric

HighwayStar 442

Mark, makes SBO dreams come true!!!

cutlassefi

Eric,
Thank you very much for the kind words. That was very very nice.
I’m a small block guy myself, go figure, even though the bulk of the builds I do are big blocks.
However I believe a 500+TQ, 450+hp small block is very doable, with the right parts. And those are the numbers most guys here hope to achieve in their builds. Imo it doesn’t HAVE to be a big block.
I’m not perfect but I try real hard to bring new parts to the Olds community. I’m blessed to have cultivated some really good relationships in the automotive parts industry. I’m just glad to be able to pass that along for all to benefit from.
Btw- in about 3-4 months there will be another announcement of new parts from a major aftermarket manufacturer, stay tuned.

Thanks again.

cjsdad

By posting in the thread, or "subscribing", we get e-mail notices when someone makes new posts in the thread. Like when you, Mark, add the realistic threats about 500 lb. ft. of torque from a small block Olds! That's good stuff Maynard!

Dunno what all these spiffy new parts would mean in my 330 block but it sure makes for some sweet dreams of a screaming all original looking 67.

OLDSter Ralph

I saw "subscribing" and "Sub'n" on a couple other threads and I was to embarrassed to ask........ I finally figured out they wanted to follow that thread.
While my main interest right now are 455's and 371, I do have a 350 from a '73 Delta 88 laying around, with no car to use it.......
So, I am very much interested to see whats out there.
Ralph

cutlassefi

Ok, the order for the second batch is going in this week.
It seems most interest is in the 4.00” stroke vs the 3.875”. Biggest difference in the two potential combinations is the availability of off the shelf pistons with the 3.875” stroke, not near as many with the 4.00”. Comments?
Thanks.

oldsmobiledave

In my opinion if I am going to the expense to stroke a small block I want to swing the biggest stroke crank in it that I can.


This will result in the most total CID. I would rather pay extra for custom pistons and get the additional stroke.