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Author Topic: 318 cylinder boring  (Read 5934 times)

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spike

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Re: 318 cylinder boring
« Reply #15 on: November 03, 2012, 22:48:11 »

the cast crank can handle 500 horses, but you never know what the future will hold :evil: 
so ill stick with the forged crank so i dont have to worry about it
also with the 4" strocker crank very lil has to be trimmed off the block
and i can also use the stock oil pan, but i do plan on goin with a 8qt pan anyways
and speaking of oil pans, a LA block pan will fit the magnum blocks right?

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Re: 318 cylinder boring
« Reply #16 on: November 04, 2012, 05:07:17 »

the cast crank can handle 500 horses, but you never know what the future will hold :evil: 
so ill stick with the forged crank so i dont have to worry about it
also with the 4" strocker crank very lil has to be trimmed off the block
and i can also use the stock oil pan, but i do plan on goin with a 8qt pan anyways
and speaking of oil pans, a LA block pan will fit the magnum blocks right?
Some people run them with almost 650. But if you ever decide to go crazy, solid rods, great pistons, and that forged crank will let you go all-out crazy with it.

Magnums use 360 pans regardless of 318 or 360. But you need the same sump for your truck.
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79dodge4ever

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Re: 318 cylinder boring
« Reply #17 on: November 04, 2012, 09:52:45 »

The bigger strokes require an aftermarket oil pan. If you've got one, for the 4.25 you have to mod it. If not, then you have to buy one, which will add another couple hundred to the price most likely.

If the block needs reboring, stick to .030 over. If the walls aren't worn enough to need it, see about standard bore.

The block must be clearance for the crank, ground a bit at the bottom.

If you aren't doing 4.15 or 4.25, aren't going to go over 6,500, aren't going to have over 11 psi, aren't going to run over a 150 shot, the cast crank should be fine. Rods and piston are a better idea to spend on.

stock bore won't cut it running a stroker; whats the fun in that?
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spike

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Re: 318 cylinder boring
« Reply #18 on: November 04, 2012, 10:24:31 »

stock bore won't cut it running a stroker; whats the fun in that?

ditto, heard of go big or go home? :p

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Re: 318 cylinder boring
« Reply #19 on: November 04, 2012, 13:00:07 »

stock bore won't cut it running a stroker; whats the fun in that?
That's exactly what most 410 strokers are, stock bore 340s.
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79dodge4ever

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Re: 318 cylinder boring
« Reply #20 on: November 04, 2012, 21:02:38 »

That's exactly what most 410 strokers are, stock bore 340s.

and since most can't afford the 340 block to start with they bore a 318 since its alot easier and cheaper to find
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Re: 318 cylinder boring
« Reply #21 on: November 04, 2012, 21:27:27 »

and since most can't afford the 340 block to start with they bore a 318 since its alot easier and cheaper to find
I understand all that. What I was meaning is that there's nothing wrong with using a stock bore in a stroker, there's not major power gains picked up by the boring, which is why anybody strokes a 318 at all.

Most 318 strokers are overbored a bit to avoid valve shrouding issues that aren't present on all applications.

Overboring is more common because the easiest way to justify it is looking at the cost of rebuilding a rough block and realizing that it's the same as stroking it, which tends to be much more true in 360s than other small blocks.
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CudaZappa

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Re: 318 cylinder boring
« Reply #22 on: November 05, 2012, 12:55:03 »

That's exactly what most 410 strokers are, stock bore 340s.

Sure they aren't .040 360s?  Very few stock bore 340s left.
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spike

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Re: 318 cylinder boring
« Reply #23 on: November 05, 2012, 13:34:16 »

alright, onto the text question, as ive always been confused by all the numbers and whatnot, what would a good cam be for the 390 with eddy 58cc heads, air gap intake and big gulp throttle body (dont remember the exact cfm's on it)

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Re: 318 cylinder boring
« Reply #24 on: November 05, 2012, 13:49:33 »

Sure they aren't .040 360s?  Very few stock bore 340s left.

I have yet to see a vintage stock bore 340 in real life
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CudaZappa

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Re: 318 cylinder boring
« Reply #25 on: November 05, 2012, 14:14:28 »

I had two of them at my house 4 years ago.  VINs: LM23P9E113777 & LM23P9E104604  Sold 'em both for a hefty profit.
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Re: 318 cylinder boring
« Reply #26 on: November 05, 2012, 18:04:34 »

Sure they aren't .040 360s?  Very few stock bore 340s left.
I've seen both from time to time. That is definitely for sure that there's very few stock bores left.

alright, onto the text question, as ive always been confused by all the numbers and whatnot, what would a good cam be for the 390 with eddy 58cc heads, air gap intake and big gulp throttle body (dont remember the exact cfm's on it)
What computer?
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Re: 318 cylinder boring
« Reply #27 on: November 05, 2012, 18:09:33 »

My 85  318 was bored .40 over with some good modes that push it 375 pluse hp.ive ran it for 2 hard years now it stays at 190 even in the florida summer and I,ve never had a problem with it .runs and drives great

spike

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Re: 318 cylinder boring
« Reply #28 on: November 05, 2012, 18:12:52 »


What computer?

im gonna get a custom programmed computer
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