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304 Power and Potential |
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PHAT69AMX
AMC Addicted Joined: Jul/07/2007 Location: West Virginia Status: Offline Points: 5919 |
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Posted: Oct/08/2018 at 10:03am |
Does anyone happen to know the AMC Head Runner Volumes in cc's ?
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Class Guy
AMC Addicted Joined: Jul/02/2007 Location: Arkansas Status: Offline Points: 969 |
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Spend some time on 304 heads (517, 990, 086, etc.) you will come to the conclusion that the basic ports are the same as 360-401 heads, just the bowls are reconfigured to accommodate the smaller valves. Chevy did the same thing with heads of the 305s.
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Addicted to acceleration.
Owner and Admin for www.classracerinfo.com |
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Scipii
AMC Fan Joined: Jun/10/2018 Location: San Jose Status: Offline Points: 8 |
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I'm working on a daily 727 (moderate upgraded) with a stock 304 and a big cake air filter; still have the stock 2-bbl and respective manifolds, but I cut the muffler off and am running free-flows. Made a difference taking the nasty smog pump off and the over-back pressure muffler.
Looking to install a free flow X-pipe to keep the back-pressure away whilst gaining some scavenging and getting a bit more on the even pulses with torque. So point is; I've found just bringing it up to spec with our tech and knowledge we have now seems to actually make the 304's happy; granted it'll never be a 700hp Nascar worthy engine, but for a balanced daily/fun car, I do believe with simple bolt ons, electronic ignition sway it'll respond better, give you slight increases all around including mileage (I noticed a small gain even with my heavy foot). I wouldn't give up on it for daily stuff but like several people have pointed out, AMC V8's are all exactly the same block and heads (390's & 401's use forged steel internals?) just bored and stroked different (as far as I can tell, please correct me if i'm wrong) I wouldn't doubt one could get 300hp out of them, but with just basic bolt ons, what are the actual number's we're getting? Sorry for reviving a dead thread, but just like AMC, it'll always be back!
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SC397
AMC Addicted Joined: Apr/30/2009 Location: Michigan Status: Offline Points: 5476 |
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Page 3 at the bottom shows actual dyno data from a +.030" overbored 304 with a Comp268H cam, Edelbrock performer intake and 500 cfm Edelbrock carb and Free Flow exhaust manifolds. This would be a typical street build with 8.5:1 compression ratio. http://rebsamcandjeep.proboards.com/thread/144/dyno-time?page=3 |
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amcfool1
AMC Addicted Joined: Jun/18/2011 Location: roanoke va Status: Offline Points: 1075 |
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Hi again, i built up a pretty nice 304 with forged pistons about 20 years ago, for my 80 J10. That was the last time you could find "off the shelf" forged pistons for a 304. (btw, same piston as a 258) Forged pistons for a 304 or 258 are not available anymore, except from specialty houses like Bulltear, and they are priced accordingly. Also, unless you are adding an artificial atmosphere, you don't really want or need forged pistons. They expand at a different rate than cast, so have to fit "looser" in the bore, and as a result can be noisy. Nothing wrong with a good quality cast piston, unless you plan to hit the Bonneville Salt Flats. good luck, gz
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george z
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amcfool1
AMC Addicted Joined: Jun/18/2011 Location: roanoke va Status: Offline Points: 1075 |
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hi, the 287 will not just drop in to a javelin, whole different beast, would be kinda cool though! good luck, gz
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george z
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Boris Badanov
AMC Addicted Joined: Dec/14/2013 Location: NH USA Status: Offline Points: 4209 |
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304s are excellent, just a bit heavy for the displacement.
4.75 bore centerlines on a 3.75 bore..... On my bucket list is a 4" stroke 304 block engine. I have a 304 saved for that purpose. I just have no time..... |
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Gremlin Dreams
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DaemonForce
AMC Addicted Joined: Jul/05/2012 Location: Olympia, WA Status: Offline Points: 1070 |
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This is all great. I am about to have access to a Rambler parts car that just dropped. Possible 287 V8 + 3spd torque command combo. It would be a great temporary package for a Javelin while I build up a 304 or whatever else. Are the rods the only weak point? How many of us have dropped forged pistons into an early V8 or added speed parts?
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Traveller
AMC Addicted Joined: Feb/26/2011 Location: Idaho Status: Offline Points: 1011 |
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The 304 and 360 rods are the same. Lightening the reciprocating parts will help them live longer.
I really like 1.94/1.5 for a larger overbore. Reason being, the bowl can be blended the way I like. The 1.84 is where I would go on a smaller overbore. It's not hard to make the port go 230cfm@.500 lift. That's without porting the runner. On the flow bench the flow characteristics are awesome. Good flow right off the seat, smooth increase all the way up, no noise, no separation. Motor runs down the road very nice. |
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53w
AMC Apprentice Joined: Sep/14/2010 Status: Offline Points: 236 |
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I still have my blown up 304 mod in my bro shed. Kept it to some day rebuild or salvage cam and heads. I really been thinking about a redo on it with good aftermarket rods and run it on a dyno to see what it was making hp wise back then.
with good aftermarket rods and other parts it would be worth doing a 304 or 360 if that is what you want. I just went with a 401 cause after my 304 rod failures i did want to mess with the small stuff any more. |
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