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Forums->Hot Heads Tech Talk->57 354 Spit fire convert to hemi?

akokdennis
57 354 Spit fire convert to hemi?


Hi Guys
First off I wanna thank all of you for sharing your knowledge with so many so freely !!!

I picked up a 57 4 door Saratoga That isnt in the best of conditions but it will provide needed Templits to build forms/Bucks for Quarter panel repairs I need on my 57 New yorker 2 door so I am fairly excited about it as its relatively rust free, But thats not what I am writing to you guys about.

I have a complete running 392 in my New Yorker but again not what I come to you about today.

I come to you today to inquire about The Saratoga it came with a complete 351 Spitfire which turns over freely and I am sure will and does run and from what I understand is a very powerful engine all on its own at over 300 hp but I have been told I can put a set of 392 Hemi Heads on it is this true?

And if it is True What am I looking at to do such a conversion? what Kind of power could it make built correctly?

Being that I am a Mechanic by trade I am assuming a great many things as I have NO experience with Old Hemis other than the one original that I currently own but never fooled with really.

I am assuming I would need a complete set of heads from a 392 with rocker arms and Push rods tubes and tins What size push rods would I need? would the same length as a 392 work?
Will 392 lifters work in this Block? flat tappet and or roller?
I am also Assuming a Piston change would be required to get any real hp out of this combination does hot heads sell these or do I have to call a custom piston mfg? J&E, Probe or the like ?
Which brings up the availability of after market cranks and rods? can I just contact Eagle or Scat for cranks and Rods? Will the 392 Crank and rods work in this block? and how much can the 354 Spitfire be bored out?

And in the end what cams can I run, will a 392 cam work in the 354 block? and will I need a different Timing cover? and what about a Timing chain? I am assuming since it accepts 392 heads I can use the 392 valve covers But what about a Intake manifold will a 392 Intake work on such a combination?

Then I cant help but to wonder about the better flowing 354 heads do these just bolt on as well???
Is a special Intake manifold required?

To me all this sounds Like I could purchase an already built 392 and have fun or If I could find a damaged 392 I could save big time building a cool engine for a hot rod.

I have been kicking the idea around about purchasing one of the Rolling car Kits available from American Gasser to build a old school hot rod and thought this combo might save me some bucks But It could also cost me twice as much as well if not done properly or I get in a hurry.

i am not looking to set the world on fire or set any track records Just wanna do some burn outs and look cool doing it. If I had to set a hp goal it would be 500-600 hp neighbor hood.

Thanks in advance for any all advice

  user offline
on: Wed 06 of Sep, 2017 [16:28 UTC] reads: 1218

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author message
Jack
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Re: 57 354 Spit fire convert to hemi?
on: Wed 06 of Sep, 2017 [17:18 UTC] score: 0.00

I am no expert either but I have built a couple of 392s.
Remember that the 392 is a raised deck engine so the stroke will be different.
I don't know of a 351, maybe you meant 354 or 331. Either way these are the low deck engines.
Only my opinion but I would shop for a rebuildable 392.
There will be others here that will provide more solid info.
What ever you decide have fun with it.

author message
akokdennis
user offline
Re: Re: 57 354 Spit fire convert to hemi?
on: Wed 13 of Sep, 2017 [16:43 UTC] score: 0.00
>
> I am no expert either but I have built a couple of 392s.
> Remember that the 392 is a raised deck engine so the stroke will be different.
> I don't know of a 351, maybe you meant 354 or 331. Either way these are the low deck engines.
> Only my opinion but I would shop for a rebuildable 392.
> There will be others here that will provide more solid info.
> What ever you decide have fun with it.

Hi Jack you are correct I meant 354
thanks for the reply

author message
George
user offline
Re: Re: 57 354 Spit fire convert to hemi?
on: Thu 07 of Sep, 2017 [03:28 UTC] score: 0.00
392 heads won't work. You need '55 331 or '56 354 heads. Your crank & rods will work, just get 354 pistons, though with a sonic check you could do a max overbore to 392 standard pistons. Would give you apx 360 cubes. You could turn down the mains on a 392 crank & find the right rods for a stroker. To convert a Poly to hemi you need complete head assymblys inc push rods, pistons & ex mans. Any Chrysler intake 331-354-392 hemi or Poly will fit. Use a 354 cam, 392 cam won't work. Nothing wrong with building a 354.

Check out the Hemi Tech Index on the HAMB.

author message
akokdennis
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Re: Re: Re: 57 354 Spit fire convert to hemi?
on: Wed 13 of Sep, 2017 [16:52 UTC] score: 0.00
> 392 heads won't work. You need '55 331 or '56 354 heads. Your crank & rods will work, just get 354 pistons, though with a sonic check you could do a max overbore to 392 standard pistons. Would give you apx 360 cubes. You could turn down the mains on a 392 crank & find the right rods for a stroker. To convert a Poly to hemi you need complete head assymblys inc push rods, pistons & ex mans. Any Chrysler intake 331-354-392 hemi or Poly will fit. Use a 354 cam, 392 cam won't work. Nothing wrong with building a 354.
>
> Check out the Hemi Tech Index on the HAMB.

Hi George
Thanks for the info,
I got my info on using 392 stuff from the Forward look forums there are some very knowledgeable people over there I don't disregard the info I gained over there lightly I also respect yours.
I will have to do more research on the project for sure, although I do think I would be better off finding another 392 to build and just selling the Spitfire to some one who could use it as is surly some one wants or needs one for a restoration.

author message
George
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Re: Re: Re: Re: 57 354 Spit fire convert to hemi?
on: Fri 15 of Sep, 2017 [12:02 UTC] score: 0.00
> I will have to do more research on the project for sure, although I do think I would be better off finding another 392 to build and just selling the Spitfire to some one who could use it as is surly some one wants or needs one for a restoration.

If you need a 392 specifically, or plan on racing, the 392 would be the way to go. If you just need a hemi for a hot rod or a resto that doesn't have to be right on then the 354 will do


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