352 Stroker? - Ford Muscle Forums : Ford Muscle Cars Tech Forum
 
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post #1 of 7 (permalink) Old 08-25-2005, 04:04 AM Thread Starter
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352 Stroker?

OK – so I was reading the “FE 390 - Realistic hp numbers” - here http://www.fordmuscle.com/phpBB/view...;forum=6&5 thread and started thinking (my first mistake ;-} )

I have a 352 and have thought about the stroker option discussed in the thread listed above on a number of occasions.

If I have read properly the 352 and 390 blocks are essentially the same save that some of the block cores with the best cylinder wall spacing/thickness were cut .050 larger to create (with the longer stroke) a 390" engine.

352 - 4.00X3.50
390 - 4.05X3.78
428 - 4.13X3.98

Mine is currently .030 over (bore) so I have ~357.2 CID

IF – The 352 block can take the 390 crank – and the 390 block (same) can take a 428 crank (per the thread above) and I am willing to replace rods and pistons (I will do this on the next rebuild anyway if I can afford to keep the thing an FE) what stops me from dropping a 428 crank in my 352 block?

Bore 4.030”
Stroke 3.98”
Displacement – 406 CID

I am assuming that bore taper is acceptable etc…

Thoughts?




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post #2 of 7 (permalink) Old 08-25-2005, 07:10 AM
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352 Stroker?

The theory is good. From what I've read on the FE forum, the biggest hurdle is obtaining pistons and connecting rods in appropriate sizes. Most maintain that a 390 core is much cheaper to get and 390 pistons and rods for the bigger crank are much more plentiful.

Most of the upgrades for the 352 that I see recommended center around headers, intake/carburation and cam improvements.

Please correct me if I'm wrong. My knowlege is strictly second hand, but I've been snooping on the FE engine forum for over a year since I also have a 352.

Mike
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post #3 of 7 (permalink) Old 08-25-2005, 07:55 AM
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352 Stroker?

Boring a 352 to 390 is safely and easily done. When a 390 crank and pistons are installed, you have a 390. If you have access to 410/428 crank (1 UA or 1 UB) with appropriate rods and pistons, it will usually support at least a 410. Since the pistons will not be off the shelf (most people don't know about or shelf stock 410 pistons, especially in a forged) expect to have to wait and possibly pay more than you would for stock or std overbore 428 pistons...that where the temptaion really starts to settle in for most guys.

The problem comes in when or if you attempt to bore the cylinders to make a home-brew 428...don't try it! Some blocks will take the bore, but the walls will more often than not be too thin for reliable performance use. It may not hit water on the boring machine, but a few months down the line, you may have an overnight visit from the Water sprite...The extra few inches is just not worth it.

If you are smart, either get the factory (or aftermarket equivalent) 3.98 crank which will give you a 410 or, if you just can't live without the extra inches...Get one of the long stroke (cast steel) cranks from Scat at 4.125, you will be slightly smaller than 428 and the added stroke should do great things for torque. It'll cost ya, but if you want a big bore FE using the stock block you have to think stroke not bore...after 40 some years of use, the stock block should be expected to have some issues if the walls are thin.

Just one opinion. As they say, "Your money,...your choice".

www.scatcrankshafts.com

4.05/3.98 = 410
4.05/4.125 = 421
4.05/4.25 = 438

Note: ain't bench racing fun ? All those toys, it's just like Christmas. All you need is money, effort and skill.
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post #4 of 7 (permalink) Old 08-25-2005, 01:53 PM
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352 Stroker?

If you want to think 352, read up on some of the PI stuff that was out in the late fifties. The Police were using 352HP motors to run down the 55 chevy's of that era. Also think about this. Compare the bore and stroke of a 352 to a Cheapie 350. Both share a 4.00x3.50 dimension. Think about the rpm potential of the chevy 350, give it better flowing heads, valve arrangement, and better crank inertia. The weak point on the 352 is the connecting rods. They use longer and much weaker rod than the 390 does. Fit a BB chevy rod on your crank with a custom chevy piston and you have alot better engine than the SBC 350. The potential for a higher RPM 352 would allow the use of a small turbo or other power adder, or you could build for n/a hp and torque.

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post #5 of 7 (permalink) Old 08-25-2005, 09:05 PM
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352 Stroker?

okay first things first, not all 352/390 blocks are created equal. sonic mapping is a must on a over bore that big. it can be done safely but a sonic check is a must. anything mentioned here is possible, money is the only celing. there are alot of hurdles you run into when going with a real custom setup like that, where as the beaten path is easier and usually cheaper. i would head on over to the fe forum and ask some of these questions there and read up in the archives this has been talked about over there alot before, so good info to be had. a project like this will involve alot of thinking and planning, not something you can just throw together. oh the adress is

www.fordfe.com
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post #6 of 7 (permalink) Old 09-08-2005, 02:22 PM
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352 Stroker?

Quote:
On 2005-08-25 13:53, galaxiegt wrote:
If you want to think 352, read up on some of the PI stuff that was out in the late fifties. The Police were using 352HP motors to run down the 55 chevy's of that era. Also think about this. Compare the bore and stroke of a 352 to a Cheapie 350. Both share a 4.00x3.50 dimension. Think about the rpm potential of the chevy 350, give it better flowing heads, valve arrangement, and better crank inertia. The weak point on the 352 is the connecting rods. They use longer and much weaker rod than the 390 does. Fit a BB chevy rod on your crank with a custom chevy piston and you have alot better engine than the SBC 350. The potential for a higher RPM 352 would allow the use of a small turbo or other power adder, or you could build for n/a hp and torque.
Galaxiegt, you hit the nail on the head! Most of the FE guys keep going on and on about 406/427/428 engine buildups, forgetting that those scarce engines and high priced parts make the FE a rich guy's toy, and relatively scarce as a performance engine on the street/strip. Your comments about what to do with the common and cheap 352 and 390's are right on! A 352/390 block is dirt cheap, often less than $100, and with the right parts can blow away a sbc. Glad to see someone with his feet planted on the ground and his mind working!
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post #7 of 7 (permalink) Old 09-08-2005, 03:38 PM
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352 Stroker?

The big problem with a 352/390?

If it runs good, no one will believe it "just" a 352 or 390!. Even if you pull the heads, let them measure everything...they still will not believe you spanked them fair and square.

" ... It is dangerous to be right in matters on which the established authorities are wrong. ..." - Voltaire
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