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Re: Small Block Heads Question
[Re: moparrush]
#1985396
01/07/16 03:35 AM
01/07/16 03:35 AM
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Joined: Jan 2005
Posts: 12,419 Kalispell Mt.
HotRodDave
I Live Here
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I Live Here
Joined: Jan 2005
Posts: 12,419
Kalispell Mt.
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any 85-91 318 2bbl motor should have the heads you need. They do have a bigger PR hole and they will hit. You could pull your heads and have a machine shop drill the PR holes bigger but they better check and see if there gonna go into the port first. You could also do it with a grinder and a lot of time. The 360 heads kill compression and TQ on those TBI engines.
I am not causing global warming, I am just trying to hold off a impending Ice Age!
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Re: Small Block Heads Question
[Re: moparrush]
#1985397
01/07/16 03:36 AM
01/07/16 03:36 AM
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Joined: Oct 2011
Posts: 516 ND
dodgedon
mopar
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mopar
Joined: Oct 2011
Posts: 516
ND
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You are correct about the push rod holes and the cracks. What you "had" were swirl port 302 heads. These are good heads but hard to find crack free. They were used on roller 318's from about 85 and up, cars, trucks, vans. They do have larger push rod holes for the roller cams.
Not sure what head you found on the 360. But I can tell you that the ports and chamber are bigger than what you had. (think lower compression/performance) on the stock 318. I would guess that the rod holes are too small....
67 Charger 383 auto 75 Dodge CNT 800 CAT Diesel 2012 Ram Crew cab 5.7 4x4
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Re: Small Block Heads Question
[Re: dodgedon]
#1985400
01/07/16 03:39 AM
01/07/16 03:39 AM
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Joined: Oct 2011
Posts: 516 ND
dodgedon
mopar
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mopar
Joined: Oct 2011
Posts: 516
ND
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I type slow.... But I agree with Dave on this
67 Charger 383 auto 75 Dodge CNT 800 CAT Diesel 2012 Ram Crew cab 5.7 4x4
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Re: Small Block Heads Question
[Re: moparrush]
#1985405
01/07/16 04:00 AM
01/07/16 04:00 AM
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Joined: Jan 2005
Posts: 12,419 Kalispell Mt.
HotRodDave
I Live Here
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I Live Here
Joined: Jan 2005
Posts: 12,419
Kalispell Mt.
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I have un-cracked 302 heads on the shelf, I have only seen a few 302 heads cracked, the 714 that replaced it I seen cracked more and the magnums are the worst I have over 20 cracked magnum heads and 4 uncracked ones.
Another option if you just want to get it running are the 308 heads from 89-92 360s, still low compression and all but they have the big holes and bolt directly on.
I am not causing global warming, I am just trying to hold off a impending Ice Age!
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Re: Small Block Heads Question
[Re: moparrush]
#1985594
01/07/16 03:21 PM
01/07/16 03:21 PM
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Joined: Jan 2005
Posts: 12,419 Kalispell Mt.
HotRodDave
I Live Here
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I Live Here
Joined: Jan 2005
Posts: 12,419
Kalispell Mt.
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I would look for either as long as they are not cracked, the cracks in these are not like the magnum, there are consequences.
Another option is the 920 casting heads from 67 273-318s, they have the smallest chambers, best ports of the small port heads, you would need to bore the holes bigger (done exactly that and there was plenty of meat). Old Mopar heads are usually ok running on unleaded fuel but if it is a concern you can add pressed in hard seats and you would have the very best heads for that engine.
The cracking in the 302-714 heads must be from the heat down south or something, I hardly ever see that around here.
I am not causing global warming, I am just trying to hold off a impending Ice Age!
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Re: Small Block Heads Question
[Re: HotRodDave]
#1985643
01/07/16 04:27 PM
01/07/16 04:27 PM
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Joined: Jan 2003
Posts: 16,376
dogdays
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 16,376
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Save yourself the worry and hassle, buy a new set of Enginequest heads. They have the Magnum chamber, valves and rocker setup and can be had with the LA intake face. They are much better heads than anything you have tried so far. They are worth another hundred hp over 318 heads with a proper shortblock sitting under them.
Or, go hunting for a 1985-1989 Fifth Avenue. They had the roller cam engine and the 302 heads and were normally very lightly used. My 110K '86 318 heads weren't cracked. But even if they are, what LaRoy Engines said is correct, they come off running engines cracked, with no evidence of water seeping from the cracks. IMHO they can be used as is. The disadvantage is the very small ports, some measured flow as low as 135cfm.
So my answer is cheap, 302s, more expensive, EQs.
R.
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