SB head question..
#727627
06/18/10 06:54 PM
06/18/10 06:54 PM
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Joined: Jan 2003
Posts: 408
Tampa, Fl
valiantboy
OP
super gas
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OP
super gas
Joined: Jan 2003
Posts: 408
Tampa, Fl
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well, times are tight. ive decided to change directions with my a100 due to cash flow. i was going to turbo it. now im going to build a 390" motor on a 318 platform. ive got a pre-magnum block to use for the base. ive also got a pair of newer 360 iron heads off of a dakota r/t. ive done some bowl cleaning, gasket matching (to LA intake), and chamber polishing. will be useing stock valves as well. i dont want anything too radical, it will be mostly a street dweller. ive found a cam that should work quite well from hughes engines. hyd roller, 208/214@.50 .512/.520 my question: will these heads be enough for this motor? i know they flow better than the x heads. i was going to use them on the turbo motor, only at 318ci. im kinda limited on budget or id just use a set of edelbrock aluminum heads. any input?  in advance
I'm WAY too baked to drive to the devil's house.
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Re: SB head question..
[Re: Kern Dog]
#727630
06/19/10 12:19 AM
06/19/10 12:19 AM
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Joined: Jul 2003
Posts: 6,167
Maryland
GO_Fish
master
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master
Joined: Jul 2003
Posts: 6,167
Maryland
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Ported OEM magnum heads should handle 390 c.i. very well. The factory magnum valve sizes should also be fine unless you plan on running the engine at high rpm's. No need for 2.02 intakes on most street applications. With lift above .500 you will probably need to cut down the top of the valve guides or you will have carnage. Check carefully.
Scott B.
"I'm a self-made man... I started with nothing, and I still have most of it!"
68 360 rusty B'cuda 'vert (GO Fish)13.59@ 98.72 mph
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01 5.9L Ram 1500 Quad Cab 4x4
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Re: SB head question..
[Re: ademon]
#727632
06/19/10 01:51 AM
06/19/10 01:51 AM
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Joined: Dec 2009
Posts: 1,074
detroit, mi
POS Dakota
super stock
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super stock
Joined: Dec 2009
Posts: 1,074
detroit, mi
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Quote:
sounds good but i would up the duration at .050
I agree. But it depends on what his compression ends up at.
9.5:1 with a 236/242 cam would be really nice for the street. The longer stroke really wants more duration and you shouldnt be afraid to go with more.
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Re: SB head question..
[Re: Dakota542]
#727633
06/19/10 09:33 AM
06/19/10 09:33 AM
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Joined: Mar 2009
Posts: 814
in front of the computer
80arrow
super stock
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super stock
Joined: Mar 2009
Posts: 814
in front of the computer
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Quote:
So the heads are 5.9L magnum heads? I've read that the magnum heads are very good. It was an article about a 400 hp 318, and they used magnum heads. If the heads don't have a 2.02" valve, you can always put in a set of new SS valves. Cam sounds very streetable.
Are Magnum heads off a 318 the same as the magnums off a 360? Is there any years that are better or are they all the same?
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Re: SB head question..
[Re: 80arrow]
#727635
06/19/10 03:53 PM
06/19/10 03:53 PM
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Joined: Jan 2003
Posts: 16,123
Grand Haven, MI
patrick
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 16,123
Grand Haven, MI
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Quote:
Quote:
So the heads are 5.9L magnum heads? I've read that the magnum heads are very good. It was an article about a 400 hp 318, and they used magnum heads. If the heads don't have a 2.02" valve, you can always put in a set of new SS valves. Cam sounds very streetable.
Are Magnum heads off a 318 the same as the magnums off a 360? Is there any years that are better or are they all the same?
they're all the same essentially.
that duration would work great for a torquey, idle-5000 RPM motor. I'd look at the hughes HER1828, I think...
1976 Spinnaker White Plymouth Duster, /6 A833OD
1986 Silver/Twilight Blue Chrysler 5th Ave HotRod **SOLD!***
2011 Toxic Orange Dodge Charger R/T
2017 Grand Cherokee Overland
2014 Jeep Cherokee Latitude (holy crap, my daughter is driving)
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Re: SB head question..
[Re: valiantboy]
#727637
06/21/10 09:21 AM
06/21/10 09:21 AM
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Joined: Jan 2003
Posts: 16,123
Grand Haven, MI
patrick
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 16,123
Grand Haven, MI
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Quote:
id definately have to have the guides cut for that cam. if i did that then id go ahead with 2.02 valves. thered be no reason not too...
yeah there is, you'd be spending another $150 for valves, you'd need new guides, or at least hone the existing ones out if you use SBC valves.
you could drop down to 1.5 chevy rockers if you're concerned about the lift, or if your mag heads need a valve job, just sink the valves .030 to get that little bit of installed height.
another option would be to look at bullet cams hydraulic roller profiles and have them regrind your stock magnum cam. it's $150+ round trip shipping. I went with their HR259/316 lobe for both intake and exhaust.
I'd see if they could fit the HR272/340 lobe on the regrind, or the HR274/325. either should work good with hughes #1110 springs. use the same lobe for intake and exhaust, the magnum heads, especially if you do a little port clean up, flow good enough on the exhaust you don't need a split pattern cam.
only downside with the 904 is the small converter hub. my comp XE262 cammed 360 cracked the hub in my 5th ave....
Last edited by patrick; 06/21/10 09:30 AM.
1976 Spinnaker White Plymouth Duster, /6 A833OD
1986 Silver/Twilight Blue Chrysler 5th Ave HotRod **SOLD!***
2011 Toxic Orange Dodge Charger R/T
2017 Grand Cherokee Overland
2014 Jeep Cherokee Latitude (holy crap, my daughter is driving)
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