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Old 12-30-2008, 09:18 AM   #1 (permalink)
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393 clevor?

My idea was to make a boss 393. Here is how I was going to do it. Please let me know if this is going to work. A 351W block with a 3.85 crank with stock 351 rods and boss 302 pistons with a set of 351C heads. Will this work out? Thanks. (I already have the heads and the block and rods and crank would just need the pistons.)

I kno you can make a 393 this way with using regular 302 pistons

I kno you can make a 351 clevor easy with the right pistons but i wanted more cubes.

Also sorry i [osted in the wrong thread the first time.
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Old 12-30-2008, 10:19 AM   #2 (permalink)
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Re: 393 clevor?

See other post.
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Old 12-30-2008, 11:34 AM   #3 (permalink)
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Re: 393 clevor?

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Originally Posted by 69fstback View Post
My idea was to make a boss 393. Here is how I was going to do it. Please let me know if this is going to work. A 351W block with a 3.85 crank with stock 351 rods and boss 302 pistons with a set of 351C heads. Will this work out? Thanks. (I already have the heads and the block and rods and crank would just need the pistons.)

I kno you can make a 393 this way with using regular 302 pistons

I kno you can make a 351 clevor easy with the right pistons but i wanted more cubes.

Also sorry i [osted in the wrong thread the first time.
boss 302 pistons are .060 shorter CH so your piston will be in the hole .060 for starters
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Old 12-30-2008, 01:33 PM   #4 (permalink)
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Re: 393 clevor?

They have 393 clevor stroker kits on ebay, so it can be done but I do not know what pistons they are using. They are using a 3.85 stroke crank and 6.250 rods.
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Old 12-30-2008, 01:38 PM   #5 (permalink)
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Re: 393 clevor?

Will the pistons stick out of the block or be in the hole? dfree383 says out .60 and PHD ford says in the hole? Hmm if its in the hole i can get the 12.5 ones to lower compression
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Old 12-30-2008, 01:47 PM   #6 (permalink)
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Re: 393 clevor?

I got in a hurry and I did the math Backwards the will be in the hole.

You Need Quench to make the combustion Efficient, Its not desireable to put the pistons in the whole to lower compression on N/A Applications.

Now You Could Cut the Decks on the Block, But you also need to cut the Intake a bunch and If your buying pistons anyway just get the right parts to atart with.
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Old 12-30-2008, 06:19 PM   #7 (permalink)
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Re: 393 clevor?

Hello again. If they are 12.5 to 1 pistons to start with and they are in the hole .60 does anyone know what the compression would be with 2v heads. The reason I ask is becasue I can buy new boss pistons for $100
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Old 12-30-2008, 07:13 PM   #8 (permalink)
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Re: 393 clevor?

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Hello again. If they are 12.5 to 1 pistons to start with and they are in the hole .60 does anyone know what the compression would be with 2v heads. The reason I ask is becasue I can buy new boss pistons for $100
what your talking about here i believe would work fine, you got a clevor intake ?
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Old 12-30-2008, 09:41 PM   #9 (permalink)
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Re: 393 clevor?

Yes i got a street boss intake awhile back. I just want to make sure i will have enough compression with the piston being in the hole by .60
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Old 12-31-2008, 04:04 AM   #10 (permalink)
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Re: 393 clevor?

Your Building a detonation problem, the Open Chamber stuff is bad enough at 8.5-9.5:1 with a 3.85 Stroke and Domed pistons Your probably going to be in the 10.5ish Range. and with .060 in the hole and Crappy Combustion Chambers your looking for trouble.

Best to Spend the Extra $$ on the Correct Pistons and Keep the compression at no more than 9.5:1 with the open chambers and If you get a set of Ausie 2v heads you'd be able to push 11:1 providing you have proper quench (Tight Deck Clearance).

KB may have some Hypers that fit the bill and may only be around $150 more than the pistons your refering too. I'm assuming you looking to do this on the cheap?

Now I'm not saying what your talking about wont work or run, But its very far from being correct and Like I've said your asking for detonation issues, which will either destroy it, Make poorer power than it would doing it correctly or Require Race type fuel to operate OK.

And in all honestly, if you looking to build a decent motor the 2v Cleveland heads will get out performed by decent aftermarket wedge heads and parts are alot more common.

My advice is don't build a motor around 1 part your getting a deal on and everything else is going to cost a good $$ to get right.
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Last edited by dfree383; 12-31-2008 at 04:07 AM.
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Old 12-31-2008, 06:42 AM   #11 (permalink)
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Re: 393 clevor?

I also have a set a 4v closed chamber heads that are cleaned up and ported alittle bit on both sides. I will call KB and ask abotu 393 clevor pistons.
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Old 12-31-2008, 06:56 AM   #12 (permalink)
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Re: 393 clevor?

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I also have a set a 4v closed chamber heads that are cleaned up and ported alittle bit on both sides. I will call KB and ask abotu 393 clevor pistons.
Those are a much better Performance choice than the open chamber 2V Heads. If you have them use them.

What are you actualy going to use this motor for? What are you looking to accomplish with it?
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Old 12-31-2008, 08:03 AM   #13 (permalink)
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Re: 393 clevor?

I was looking at a KB Catalog and You could Probably Get away with Milling about .050 off the top of a Cleveland Piston and make it work.

Look like you'll need something in the 1.620 pin height range and the Cleveland stuff is 1.670. It also depends on what years 351w block you use too, the deck heights vary.
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Old 12-31-2008, 01:35 PM   #14 (permalink)
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Re: 393 clevor?

It is mostly going to be a track car. Not super fast.(mix race gas) The car will be a mustang 65-68(not sure yet). How hard is it to mill the pistons where can I get that done? Any 351C piston? I am undeceded on the cam and stuff just trying to sort out the shortblock before i buy. (just need pistons that will work with a 3.85w crank stock 351W rods and its a 72-73 block)
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Old 01-01-2009, 05:58 AM   #15 (permalink)
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Re: 393 clevor?

Its not a big deal to cut them, any competent machine shop should be adle to do it.

But with that in mind if your looking for a track only higher compression motor, I'd just have a set of pistons made for it, its no big deal and you can get them made with thiner race type rings and some features you won't get on the Cheaper pistons. its worth the few extra $$$

Plus a forged piston is always a better option for a race car than a hyper.

Another question, Why not just build a 351C Stroker and save yourself all the BS? 408 Cranks are avaliable for them and Blocks aren't that hard to find, Plus Parts are on the shelf and Would Require and Special attention.
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Last edited by dfree383; 01-01-2009 at 06:01 AM.
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