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Author
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Topic: Building this #@&*! 393W Stroker
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Clark
Gearhead Posts: 561
From: Rowlett,Texas
Registered: Aug 99
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posted 09-17-2001 01:43 PM
   
Well from the title you can see this is starting to be a little frustrating but I wanted to vent. After locating all the parts and having the machine work done, I am trying to assemble the motor. Besides having a bearing issue, I was installing the pistons and now I have a clearance problem with the piston skirts. It seems the counterweights are needing some more room, so I have cut about 1/2 in. off the skirts on all the pistons and rebeveled the edge. Used a micrometer and made sure that all the cuts are within a few thousands of each other.Good thing these are stock pistons. So now I am starting to reassemble again checking clearances one piston at a time. I do want to thank everyone with the compression ratio issue, because the pistons come all the way flush with the deck, sure glad they are dished or the ratio would have been too much. I guess my main advice is unless you want to customize, the stroker kits might be the way to go over putting one together yourself. ------------------
69 351W Sportsroof Deluxe [This message has been edited by Clark (edited 09-17-2001).]
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AKBOSSMAN
Gearhead Posts: 2807
From: WASILLA , AK USA M&M #743 MCA #40857
Registered: Oct 2000
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posted 09-17-2001 04:32 PM
Thanks!  ------------------
WAYNE CURTIS
70 GRABBER GREEN BOSS 302
01 Focus ZX3
03 Boss 281 (waiting on order form)
92 SHELBY 4X4 (K-9 IDITAROD LEAD DOG)
www.iditarodtrail.com
"If your under control then your not going fast enough" Parnelli Jones
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JAAZZY
Gearhead Posts: 745
From: Bay Area, CA
Registered: Apr 2001
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posted 09-17-2001 04:58 PM
I would have already given up is why I decided to just buy it already done. Good luck to you.
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Just Jim
Gearhead Posts: 381
From: So Cal
Registered: Feb 2000
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posted 09-17-2001 10:53 PM
I must have missed an earlier post about the 393 stroker,but what kind of pistons are you using?I've been looking into the 393 stroker for sometime now and any info is appreciated.------------------
"Just Falcon Around"
1962 Falcon 351W
1958 Morris Minor 289
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Clark
Gearhead Posts: 561
From: Rowlett,Texas
Registered: Aug 99
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posted 09-18-2001 09:25 AM
Jim,
I am using stock dished 302 pistons, I originally had a set of speed pro one's but they were flat tops with just valve reliefs cut in them. Due to the 69 block and heads, I already had a 10.7 to 1 compression to start with and so I needed the dished pistons to keep the ratio down.I am learning alot and just wanted to let others know that the stroker kits already considered some of these issues and have the right parts to start with. ------------------
69 351W Sportsroof Deluxe
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richard bohm
Gearhead Posts: 373
From: tucson,az-luray,va
Registered: May 2001
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posted 09-18-2001 03:42 PM
the correct way to gain clearance for piston skirts on a stroker motor os modify the crankshaft counterweights. you make them more oval at the point where the skirt meets the counterweight. this way you dont weaken the piston, and mess up the piston balance.
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Just Jim
Gearhead Posts: 381
From: So Cal
Registered: Feb 2000
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posted 09-18-2001 06:33 PM
I guess it would be better to buy one of the stroker "kits" that have matched components instead of piecing things together. Keith Black piston #364 is made for the 393 stroker and I guess the skirts wouldn't have to be cleared.It is dished enough to obtain a streetable 10 to 1 with 60cc heads.------------------
"Just Falcon Around"
1962 Falcon 351W
1958 Morris Minor 289
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Clark
Gearhead Posts: 561
From: Rowlett,Texas
Registered: Aug 99
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posted 09-19-2001 12:03 PM
Jim,
Just remember that 351w's deck height is not the same on all years. Mine is a 69 block with a 9.480, in 71 it is 9.503 so make sure that is in the compression ratio equation. Especially because the stock ratio for mine was 10.7 to 1 before the stroker kit.Richard I agree grinding the counterweights is one way, but I disagree that I am weakening the pistons by removing some of the skirt. Some of the highest performance pistons don't even have skirts, so as long as I remove the same amount within a few thousands I should be ok.
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Clark
Gearhead Posts: 561
From: Rowlett,Texas
Registered: Aug 99
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posted 09-25-2001 11:31 AM
I just wanted to let you know of another issue that came up while installing the oil pan. After checking the clearances for the windage tray and oil pump pickup tube, I figured I was ready to bolt on the pan. So after installing it, I wanted to rotate the engine just to make sure everything was ok, and to my surprise I heard a slight rubbing sound!  Pulled the pan off and found that one of the connecting rods was rubbing on the oil pan, made some adjustments and now it clears but this goes to show you, check and recheck. ------------------
69 351W Sportsroof Deluxe
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