1969 351w Block stroker pistons - Ford Mustang Forums : Corral.net Mustang Forum
 
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post #1 of 14 Old 04-17-2019, 01:16 AM Thread Starter
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1969 351w Block stroker pistons

Well I know this topic has been beat to death and back tons of times. I just find my self in a bit of a situation with a mix match of parts I have left over from several engine combos and wanted to run something by everybody.

1969 windsor block I have never ran, had all machine work done a while ago, 4.030" with 5 thou taken off the deck just enough to clean it up however this puts the deck height right around 9.462" and 9.464" according to my calipers.

Rotating assembly I was planning on using is

Brand new rpm forged 4.000" crank
Brand new eagle 6.2" H beam rods

and I have some probe srs 1.280" pistons with a couple hundred street miles on them

Haven't mocked it up yet but if all those pieces are accurate I will be 15-20 thou out of the hole.


I was wondering however If I could run a 1.24" compression height piston

(Like these Icon Pistons https://www.summitracing.com/parts/u...view/make/ford)

which would drop it back down in the hole and maybe cut another .020" off the deck to bring it all to zero deck. Anybody done this? And BTW are Icon pistons any good?


1968 Mustang, 408W 10.25 comp, AFR 205, Holley Hp, 1.75" long tubes, Toploader 4 speed, 3.50 gears
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post #2 of 14 Old 04-17-2019, 02:03 AM
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Hard to accurately measure deck height with calipers, so I would get that checked by someone who has BHJ tooling to check the deck height first. Better yet, do a simple mockup and measure how far the piston is above the deck


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Last edited by strokeme; 04-17-2019 at 02:15 AM.
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post #3 of 14 Old 04-17-2019, 02:57 AM
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I usually do a 1.235.....but 1.240 is certainly doable. 1.250 to 1.260 is better if the block height is correct (and I have no doubt it is).

I'm guessing that you have a 12357 piston. If so, that piston is .350 thick and has a .230 top land. Take .020 off the top, save a ton of money, and have a good weekend.

Icons are okay, but watch the sizing and the weights.
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post #4 of 14 Old 04-17-2019, 03:52 AM Thread Starter
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Originally Posted by Mark O'Neal View Post
I usually do a 1.235.....but 1.240 is certainly doable. 1.250 to 1.260 is better if the block height is correct (and I have no doubt it is).

I'm guessing that you have a 12357 piston. If so, that piston is .350 thick and has a .230 top land. Take .020 off the top, save a ton of money, and have a good weekend.

Icons are okay, but watch the sizing and the weights.
I'm pretty sure I got the deck height pretty close

They are your 12360 pistons with the 22cc "inverted dome" Pistons can these have 0.020" taken off no problem?

1968 Mustang, 408W 10.25 comp, AFR 205, Holley Hp, 1.75" long tubes, Toploader 4 speed, 3.50 gears
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post #5 of 14 Old 04-17-2019, 03:08 PM
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Last year I built a 410 engine with the same block, had the same issue (pistons above deck). I used a Cometic MLS gasket, they will build one for you in whatever thickness you want. Worked perfectly and not expensive, considering you need a head gasket anyway.
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post #6 of 14 Old 04-17-2019, 08:08 PM Thread Starter
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Last year I built a 410 engine with the same block, had the same issue (pistons above deck). I used a Cometic MLS gasket, they will build one for you in whatever thickness you want. Worked perfectly and not expensive, considering you need a head gasket anyway.
Yeah, I have thought about that too, just running a 0.060" or so head gasket, probably a better option then cutting my block any further, I'm thinking If I cut it down to 9.440 or so that its gonna make me have to start cutting on the intake to fit also which I don't want to do

1968 Mustang, 408W 10.25 comp, AFR 205, Holley Hp, 1.75" long tubes, Toploader 4 speed, 3.50 gears
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post #7 of 14 Old 04-18-2019, 03:05 PM
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I'm pretty sure I got the deck height pretty close

They are your 12360 pistons with the 22cc "inverted dome" Pistons can these have 0.020" taken off no problem?
YeeeeUP! You're good to go.
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post #8 of 14 Old 04-19-2019, 03:33 AM Thread Starter
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YeeeeUP! You're good to go.
That's a better option then running a thick head gasket i'm assuming? By the way are these pistons still available? I see them

https://www.vigilanteparts.com/Probe...01-2-12360.htm

1968 Mustang, 408W 10.25 comp, AFR 205, Holley Hp, 1.75" long tubes, Toploader 4 speed, 3.50 gears
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post #9 of 14 Old 04-19-2019, 06:05 AM
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thanks rymadd for the link
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post #10 of 14 Old 04-19-2019, 11:26 PM
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That's a better option then running a thick head gasket i'm assuming? By the way are these pistons still available? I see them

https://www.vigilanteparts.com/Probe...01-2-12360.htm
That's a trick question.

Yes the part number is still available, but it's a different piston.

If anyone needs spares, DSS is a close copy of a Probe. They probably won't admit it, but they could use my photos for a lot of their parts. And, they were the only piston company smart enough to make the smaller dish sizes I used. If imitation is the finest form of flattery, I am really flattered. Don't get the ones that have the snail tracks in the skirts. Those will eat power.

The new SRS has forced pin oilers, banded slipper skirts, thinner rings, and no more symmetrical valve reliefs. They're more upscale. The new PRS are upscale of that, and the FPS are no longer available, but I might use Autotec for those.

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post #11 of 14 Old 04-19-2019, 11:37 PM
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There's a lot of ways to do it. I have done a few. 69 blocks are shorter deck as you've already realized, and most stroker kits are set up for 9.500" deck before cleanup which usually gives plenty to cut for zero deck. The 69 not so much, so you have to be careful with 'em. Mark will steer you right on them. One of the better runners I put together was the same 69 block barely cut to square up, 6.300" rods and 331 pistons. Had to fill the block as the owner wanted high compression-and he got it with the domes. It's been 5.60's quite a few times with DA's below sea level (rare air), typically 5.80's at 117, 2710lb. Can't believe it stayed together as hard as he was on it. He's sold that and having another built as we speak, well ported CHI intake and Kuntz/Brodix HH heads, he's shooting for 1000hp N/A and might actually do it based on what I've seen of it. 462".

Mark I have a question. If he cuts the pistons, do ya think he would have to re-cut the valve reliefs?

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post #12 of 14 Old 04-20-2019, 01:27 AM
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There's a lot of ways to do it. I have done a few. 69 blocks are shorter deck as you've already realized, and most stroker kits are set up for 9.500" deck before cleanup which usually gives plenty to cut for zero deck. The 69 not so much, so you have to be careful with 'em. Mark will steer you right on them. One of the better runners I put together was the same 69 block barely cut to square up, 6.300" rods and 331 pistons. Had to fill the block as the owner wanted high compression-and he got it with the domes. It's been 5.60's quite a few times with DA's below sea level (rare air), typically 5.80's at 117, 2710lb. Can't believe it stayed together as hard as he was on it. He's sold that and having another built as we speak, well ported CHI intake and Kuntz/Brodix HH heads, he's shooting for 1000hp N/A and might actually do it based on what I've seen of it. 462".

Mark I have a question. If he cuts the pistons, do ya think he would have to re-cut the valve reliefs?
It's not likely, although it depends on the cam profile. Normally anything less than .650 lift will clear. I've seen a few at .740ish clear with solid rollers...and I mean clear bigly. So much that we all made trips to the motor room to see it for ourselves.

Anything under .600 won't have an issue with a .020 cut.

Also, if you weigh the piston before you cut it and after you cut it you'll know exactly how many cc's you're taking out.
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post #13 of 14 Old 04-21-2019, 03:40 AM Thread Starter
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It's not likely, although it depends on the cam profile. Normally anything less than .650 lift will clear. I've seen a few at .740ish clear with solid rollers...and I mean clear bigly. So much that we all made trips to the motor room to see it for ourselves.

Anything under .600 won't have an issue with a .020 cut.

Also, if you weigh the piston before you cut it and after you cut it you'll know exactly how many cc's you're taking out.
Do you have a calculation for grams removed to cc? I believe they are 422 grams right now

1968 Mustang, 408W 10.25 comp, AFR 205, Holley Hp, 1.75" long tubes, Toploader 4 speed, 3.50 gears
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post #14 of 14 Old 04-21-2019, 04:15 PM
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2.7 grams per cc.
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