#1  
Old 09-22-2018, 03:22 AM
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Default 350 Block Stroker Builds ?

A guy on another forum said he'd never seen anybody post about having built a 350 block stroker. Well, I don't remember ever seeing one either. But, with all the members here, there's bound to have been some guys who built one.

So, I'd like to hear from some who have built a 350 block stroker, with at least a 4" stroke. If ya'll know of build threads for such an engine here, please post a link.

The only article I remember reading about a 350 block stroker is the one Ace Brewer did.

https://www.hotrod.com/articles/hppp...-engine-build/

Here's a thread Ace did on another Pontiac forum(which many here don't like).

http://www.pontiaczone.com/forum/showthread.php?t=15973

Since he sold 350 block stroker parts, I figure there's bound to be some guys here who built one.

No need to post that 400 block strokers make more power for the same money. Everybody knows that.

Any info about posts from guys(besides Ace) who have actually built a 350 block stroker will be appreciated. Thanks !


Last edited by ponyakr; 09-22-2018 at 03:59 AM.
  #2  
Old 09-22-2018, 06:38 AM
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As far as my 2 cents goes ( which you will likely say you don't care about) in terms of a street / very light strip car , I would sooner build a 400 with the non popular late crappy block then spend the bucks and time to stroke a 350!

I mean you can't even get the darn motor up to the far and away better breathing Bore size of a .030" over Chevy 350 for God's sake!!

If you want a large amount of torque for towing with a motor that's fully done in terms of stock iron heads at 4000 rpm then by all means have at it!

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Last edited by steve25; 09-22-2018 at 06:57 AM.
  #3  
Old 09-22-2018, 09:04 AM
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" As far as my 2 cents goes ( which you will likely say you don't care about)..."


Your absolutely right ! I don't care about this opinion you have about the Pontiac 350.

The ONLY purpose for this thread, as mentioned, is to locate somebody who has actually built & used a 350 block stroker, or at least to locate some threads or posts about an actual 350 block stroker that was built.

For this thread, I don't care about any other size Pontiac engine, and I especially don't care about any Chevy engine.

I have absolutely nothing against you personally. But, with all due respect, if that's all you have to contribute to this thread, please do not post on it again. Thanks for your respect of this request !

  #4  
Old 09-22-2018, 10:42 AM
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Interesting thread!

I get why most people go with 400+ cu in builds (myself included), but I can also see that a 3.905" - 3.935" bore can't make good power either. There are people building 383 cu in strokers with 5.3L LS engines making crazy power, so there's no reason that couldn't be done with a Pontiac 350.

To me biggest downside of a Pontiac 350 besides bore size is the weight of such a small cu in engine. However, if I had a numbers matching 350 H.O. Firebird or a '74 GTO, I'd be inclined to see what I could get out of one.

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Old 09-22-2018, 11:56 AM
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Yeah, Bill Rink & Mike Morgan have proven that you can make 10 sec power with an iron head 350 block build. And those SS engines are only allowed slightly more than the stock 3.75 stroke. In fact, just this morning, Mike Morgan ran a 10.60 with his '77 Formy. That ain't bad for a 350 with 6X iron heads & a Q-jet.

https://www.dragracecentral.com/DRCS...UMMIT#indextop

The 383 that Ace built made 450hp + with iron heads & a 4" stroke.

So, I don't think there should be any doubts that a 350 block stroker can make decent power.

So, since this site has been up for 20 years or so, surely some member here, besides Ace, has built a 350 block stroker.

Hey, if I had the money, I'd build a few and do lots of experimenting & testing, for street, street/strip, & strip only builds.


Last edited by ponyakr; 09-22-2018 at 12:22 PM.
  #6  
Old 09-22-2018, 01:29 PM
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Butler lists two different stroker kits for 350's on their site. Maybe they have done it.

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  #7  
Old 09-22-2018, 02:08 PM
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Quote:
Originally Posted by equidr View Post
Butler lists two different stroker kits for 350's on their site. Maybe they have done it.
Sounds reasonable to me. At least they should know how many 350 stroker assemblies they have sold. Maybe somebody here who will be talking to them soon can ask about 350 stroker builds they have done or know about.

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Old 09-22-2018, 08:58 PM
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Interesting thread. I've got a number of 350 builders.

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Old 09-23-2018, 07:18 AM
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I applaud those who have the time and money and dedication to yank serious power out of the 350 , but there are just far easier ways for the average guy to build a motor that on average puts out more power cheaper with less bucks !

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  #10  
Old 09-23-2018, 08:18 AM
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My brother PREFERs the 350 engine, with 2bbl. Reasons are subtle but effective in polite company.

My early-teen 1968 350 had good TQ and capable of high MPH, high MPG. After all the abuse, the bores and bearings were excellent.

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Old 09-23-2018, 08:29 AM
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I believe they can be stroked out to 408

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Old 09-23-2018, 09:33 AM
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Quote:
Originally Posted by steve25 View Post
I applaud those who have the time and money and dedication to yank serious power out of the 350 , but there are just far easier ways for the average guy to build a motor that on average puts out more power cheaper with less bucks !
"...I don't care about this opinion you have about the Pontiac 350..."

"...For this thread, I don't care about any other...Pontiac engine

I have absolutely nothing against you personally. But, with all due respect, if that's all you have to contribute to this thread, please do not post on it again. Thanks for your respect of this request ! "

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Old 09-23-2018, 10:55 PM
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Quite honestly it's not worth the trouble
I have a set of the pistons to do it but with the cost of a crankshaft, rods, machine work, rings, bearings. You can build a 400 that would run circles around it for less.
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  #14  
Old 09-23-2018, 11:25 PM
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Quote:
Originally Posted by 68azbird View Post
Quite honestly it's not worth the trouble
I have a set of the pistons to do it but with the cost of a crankshaft, rods, machine work, rings, bearings. You can build a 400 that would run circles around it for less.
Yes, as I mentioned in post #1, everybody knows that you can make more power for the same or less money, using a 400 block. That has been WELL established here, for many years.

As stated, the purpose of this thread is NOT to ask how much better off you are using a 400 block than a 350 block.

I'm asking if anybody here has built or knows of a 350 block stroker build, besides the one that Ace Brewer did.

  #15  
Old 09-23-2018, 11:35 PM
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I seriously contemplated going this way when I owned a complete numbers matching '73 Formula 350;
I realize that it seems to make little sense when larger bore blocks are out there - but has anyone paid attention to asking prices of 400/455 blocks these days? - compare that to "complete running" Pontiac 350's that I occasionally see pop up for as little as $50(!) and all of a sudden, it starts to make more sense...

I love unusual builds... which is another reason why I contemplated going this route...

From my first hand experience, a garden variety 70's P350 sure felt alot meaner than a garden variety C350 of the same vintage...

I hope someone chimes in.

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  #16  
Old 09-24-2018, 12:33 PM
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There’s nothing wrong with 350 based strokers. Some of your guys need a reality check as to how much useable 400, 428 and 455 blocks are going for these days. I knew a guy who was planning to build a 326 based torque engine for his ‘58 GMC(.030 over 326 with a 4.21” stroke. If I were going road racing, give me a 350 block with splayed four bolt mains, a forged 3.750 crank, LS based pistons with a 1.5/1.5/3.0 mm ring pack and Crower Sportsman rods. Top it off with KRE or E-head 72 cc chambers milled to 66 cc. Tom S. got nearly 480 hp with a 301T based engine....

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Old 09-24-2018, 03:27 PM
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I saw an episode of "muscle car" a few years back when they stroked a 326 in a 67 lemans. That was an interesting build too.

i have my first pontiac engine, a 1970 P350. i may build it someday just for fun. maybe i'll put a 4.5 stroke in it. lol

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Old 09-24-2018, 04:12 PM
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https://sfbay.craigslist.org/sby/pts...701686814.html

I saw this one for sale the other day

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Old 09-24-2018, 06:26 PM
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Quote:
Originally Posted by ponyakr View Post
Yes, as I mentioned in post #1, everybody knows that you can make more power for the same or less money, using a 400 block. That has been WELL established here, for many years.

As stated, the purpose of this thread is NOT to ask how much better off you are using a 400 block than a 350 block.

I'm asking if anybody here has built or knows of a 350 block stroker build, besides the one that Ace Brewer did.
68azbird made a valid statement. He was legitimately exploring this exact scenario, because I have the 350 engine that he was going to use as the foundation. But when it comes down to the nuts and bolts and dollars, the project made less sense from a practicality point of view.

Does anyone have a realistic projection on what the stroke increase would get you? It amounts to a relatively small increase in stroke, assuming 3.75 to 4.00. What would be the estimated percent bump in power?

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Old 09-24-2018, 06:41 PM
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If the engine's induction system was the same, I think logic holds that it would likely make about the same power, but would do so at a lower RPM. I'm assuming a lot there, like if the engine can take advantage of the head's flow potential without the longer stroke. Without improvements to the flow and cam profile I don't see that extra 1/4" of stroke being that large of a benefit.

In a normally aspirated build, I kind of agree that even a 557 block 400 would be a better candidate. What I've always wondered about however is the 350's potential for a boost (specifically turbocharged) build. You overcome some of the engine's pitfalls like it's small bore when you start force feeding it.

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