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Old 318 with new magnum heads...yay or nay? #1180304 02/18/12 12:29 AM 02/18/12 12:29 AM
Joined: Mar 2005 Posts: 1,630 North Central Florida E eightlitermopar OP top fuel
eightlitermopar OP top fuel E Joined: Mar 2005 Posts: 1,630 North Central Florida	My coronet has the 318 granny motor in it. Nothing awesome, but I will be pulling it to regasket the thing (since it leaks from every possible place). While it is out, I am afraid what I will find in regards to the 1969 castings. Is the swap to the newer magnum heads worth it? Should I use some iron ones I find from the local junkyard? I will be running manifolds since it is a 4 door cruiser, but what are your experiences? Yay or Nay? old small block heads or newer magnum castings?? Eightlitermopar Mopar or no car

Re: Old 318 with new magnum heads...yay or nay? [Re: eightlitermopar] #1180305 02/18/12 12:31 AM 02/18/12 12:31 AM
Joined: Jan 2003 Posts: 28,399 Posting from 1893 in NW FL TheBlueBeast Too Many Posts
TheBlueBeast Too Many Posts Joined: Jan 2003 Posts: 28,399 Posting from 1893 in NW FL	gonna need an intake with new heads. straight bolts versus angled bolts. Just a "heads" up.

Re: Old 318 with new magnum heads...yay or nay? [Re: TheBlueBeast] #1180306 02/18/12 12:36 AM 02/18/12 12:36 AM
Joined: Oct 2005 Posts: 6,048 Back home in PA B BulletBob master
BulletBob master B Joined: Oct 2005 Posts: 6,048 Back home in PA	Here's the intake you'll need to use your original stuff with on a LA360 for a 75 Fury wagon I'm doing right now with a mag head swap 7077159-SAM_3363.JPG (317 downloads)

Re: Old 318 with new magnum heads...yay or nay? [Re: eightlitermopar] #1180307 02/18/12 12:36 AM 02/18/12 12:36 AM
Joined: Jan 2007 Posts: 208 North Texas 3 360cuda enthusiast
360cuda enthusiast 3 Joined: Jan 2007 Posts: 208 North Texas	According to the pro's, the magnum heads will flow better than the old ones do.

Re: Old 318 with new magnum heads...yay or nay? [Re: 360cuda] #1180308 02/18/12 12:39 AM 02/18/12 12:39 AM
Joined: Oct 2005 Posts: 6,048 Back home in PA B BulletBob master
BulletBob master B Joined: Oct 2005 Posts: 6,048 Back home in PA	Here's another 7077164-SAM_3674.JPG (297 downloads)

Re: Old 318 with new magnum heads...yay or nay? [Re: BulletBob] #1180309 02/18/12 12:41 AM 02/18/12 12:41 AM
Joined: Mar 2005 Posts: 1,630 North Central Florida E eightlitermopar OP top fuel
eightlitermopar OP top fuel E Joined: Mar 2005 Posts: 1,630 North Central Florida	I knew that a new intake would be needed. that would have sucked trying to get my old one to fit Anyway, just wondering if it delivers the difference enough to make the swap worth it. thanks! Eightlitermopar ps. Do you have to get custom pushrods? Or do you use the magnum pieces? Mopar or no car

Re: Old 318 with new magnum heads...yay or nay? [Re: BulletBob] #1180310 02/18/12 12:43 AM 02/18/12 12:43 AM
Joined: Oct 2005 Posts: 6,048 Back home in PA B BulletBob master
BulletBob master B Joined: Oct 2005 Posts: 6,048 Back home in PA	Magnum flow better & from what I've been told are 10-12 cc's less in combustion chamber volume or 1 point in compression depending on bore size. They're already set for unleaded gas

Re: Old 318 with new magnum heads...yay or nay? [Re: BulletBob] #1180311 02/18/12 12:50 AM 02/18/12 12:50 AM
Joined: Oct 2005 Posts: 6,048 Back home in PA B BulletBob master
BulletBob master B Joined: Oct 2005 Posts: 6,048 Back home in PA	Summit #SUM-1457650 pushrods,AMC or aftermarket oil through Chrysler lifters,cut some casting out for the pushrods to clear & go. You can use the MP steel reinforced neoprene VC gaskets on your original VC's & keep that all original look a little

Re: Old 318 with new magnum heads...yay or nay? [Re: BulletBob] #1180312 02/18/12 12:57 AM 02/18/12 12:57 AM
Joined: Oct 2005 Posts: 6,048 Back home in PA B BulletBob master
BulletBob master B Joined: Oct 2005 Posts: 6,048 Back home in PA	92 only truck or van Magnum manifolds are the trick. 2 1/4" outlet Requires a different dipstick & tube for the trans. What trans do you have?

Re: Old 318 with new magnum heads...yay or nay? [Re: BulletBob] #1180313 02/18/12 01:24 AM 02/18/12 01:24 AM
Joined: Jan 2003 Posts: 9,887 USA CrAlt master
CrAlt master Joined: Jan 2003 Posts: 9,887 USA	Why not just keep it simple and swap on some '302 swirl port heads? Everything you have now will bolt up. No fancy intake or manifolds needed. They are already set up for unleaded gas. And they flow better then the old 318 heads. Look for them on a 85 or later M-body with a 2bbl or a TBI truck engine. Magnum heads are better but if you are keeping the motor stockish i dont think they are worth all the extra crap you have to do to make them fit. I was asked to contribute money to help solve the civil unrest in Egypt, but I suspect it's some sort of pyramid scheme.

Re: Old 318 with new magnum heads...yay or nay? [Re: eightlitermopar] #1180314 02/18/12 01:29 AM 02/18/12 01:29 AM
Joined: Jan 2003 Posts: 6,816 Alton, IL D Dakota_Don master
Dakota_Don master D Joined: Jan 2003 Posts: 6,816 Alton, IL	go for it.. it will be like a new motor

Re: Old 318 with new magnum heads...yay or nay? [Re: CrAlt] #1180315 02/18/12 04:45 AM 02/18/12 04:45 AM
Joined: Oct 2005 Posts: 6,048 Back home in PA B BulletBob master
BulletBob master B Joined: Oct 2005 Posts: 6,048 Back home in PA	Quote: Why not just keep it simple and swap on some '302 swirl port heads? Everything you have now will bolt up. No fancy intake or manifolds needed. They are already set up for unleaded gas. And they flow better then the old 318 heads. Look for them on a 85 or later M-body with a 2bbl or a TBI truck engine. Magnum heads are better but if you are keeping the motor stockish i dont think they are worth all the extra crap you have to do to make them fit. His stock exhaust manifolds will bolt to them

Re: Old 318 with new magnum heads...yay or nay? [Re: CrAlt] #1180316 02/18/12 05:17 AM 02/18/12 05:17 AM
Joined: Apr 2007 Posts: 2,327 Glendale, AZ 6 69L78Nova Banned. Forever.
69L78Nova Banned. Forever. 6 Joined: Apr 2007 Posts: 2,327 Glendale, AZ	Quote: i dont think they are worth all the extra crap you have to do to make them fit. Oh yes they are! Even with a MILD cam, its a night and day difference 1969 Nova 454/M21/3.31 Mild mid-11 second weekend cruiser 1994 F150 XLT Super Cab 2WD 5.0/4R70W/3.55 (Daily driver)

Re: Old 318 with new magnum heads...yay or nay? [Re: 69L78Nova] #1180317 02/18/12 05:44 AM 02/18/12 05:44 AM
Joined: Oct 2005 Posts: 6,048 Back home in PA B BulletBob master
BulletBob master B Joined: Oct 2005 Posts: 6,048 Back home in PA	Let's see Bigger valves Smaller chambers Improved version of the "swirl port" Lighter valves Better flow overall 1.6 Ratio Rockers instead of 1.5 Looks like it's well worth it to me

Re: Old 318 with new magnum heads...yay or nay? [Re: BulletBob] #1180318 02/18/12 06:38 AM 02/18/12 06:38 AM
Joined: Aug 2003 Posts: 12,291 Kent, Wa 340SHORTY Truck Nut
340SHORTY Truck Nut Joined: Aug 2003 Posts: 12,291 Kent, Wa	and a 400.== intake manifold I am truckless..

Re: Old 318 with new magnum heads...yay or nay? [Re: 340SHORTY] #1180319 02/18/12 09:39 AM 02/18/12 09:39 AM
Joined: Jan 2003 Posts: 8,027 The Grand State of Confusion-O... SKR8PN master
SKR8PN master Joined: Jan 2003 Posts: 8,027 The Grand State of Confusion-O...	If your going that far with the engine regasket,(new heads and intake and pushrods and lifters) you might as well re-ring it,re-bearing it and cam it while your in there. "IF" the bores are OK and within specs that is..... Karma has no menu. You get served what you deserve.

Re: Old 318 with new magnum heads...yay or nay? [Re: BulletBob] #1180320 02/18/12 10:40 AM 02/18/12 10:40 AM
Joined: Mar 2005 Posts: 1,630 North Central Florida E eightlitermopar OP top fuel
eightlitermopar OP top fuel E Joined: Mar 2005 Posts: 1,630 North Central Florida	Quote: 92 only truck or van Magnum manifolds are the trick. 2 1/4" outlet Requires a different dipstick & tube for the trans. What trans do you have? its the 904, nothing fancy. eight Mopar or no car

Re: Old 318 with new magnum heads...yay or nay? [Re: SKR8PN] #1180321 02/18/12 10:45 AM 02/18/12 10:45 AM
Joined: Mar 2005 Posts: 1,630 North Central Florida E eightlitermopar OP top fuel
eightlitermopar OP top fuel E Joined: Mar 2005 Posts: 1,630 North Central Florida	Quote: If your going that far with the engine regasket,(new heads and intake and pushrods and lifters) you might as well re-ring it,re-bearing it and cam it while your in there. "IF" the bores are OK and within specs that is..... yeah....I know. The engine runs sweet. It doesn't burn oil, blow smoke, etc. (probably because it has no oil to burn! ) Of course I am exaggerating, but it does leak a bit. I hate to start looking for problems if I can avoid it. So far this engine gets about 18-22 mpg on roadtrips. Would these heads hurt that mileage or improve it? I know that increased power means increased gas intake eightlitermopar Mopar or no car

Re: Old 318 with new magnum heads...yay or nay? [Re: SKR8PN] #1180322 02/18/12 11:25 AM 02/18/12 11:25 AM
Joined: Jan 2003 Posts: 9,887 USA CrAlt master
CrAlt master Joined: Jan 2003 Posts: 9,887 USA	Quote: If your going that far with the engine regasket,(new heads and intake and pushrods and lifters) you might as well re-ring it,re-bearing it and cam it while your in there. "IF" the bores are OK and within specs that is..... And if your going THAT far why not just find a 360? I was asked to contribute money to help solve the civil unrest in Egypt, but I suspect it's some sort of pyramid scheme.

Re: Old 318 with new magnum heads...yay or nay? [Re: 340SHORTY] #1180323 02/18/12 12:11 PM 02/18/12 12:11 PM
Joined: Oct 2005 Posts: 6,048 Back home in PA B BulletBob master
BulletBob master B Joined: Oct 2005 Posts: 6,048 Back home in PA	Quote: and a 400.== intake manifold [/quot That intake in the pic is $180..00 new shipped to the door, The Performer RPM Air-Gap is $295.00 new

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