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  #1  
Old 01-27-2019, 12:35 PM
jcisworthy jcisworthy is offline
232 I6
 
Join Date: Apr 01, 2016
Location: Amsterdam NY
Posts: 33
304 Performance Build

I recently had a 304 on the dyno. It was steer, user friendly build for a Hornet hatchback wagon. You can check it out on the forum link

http://theamcforum.com/forum/304-on-...opic98091.html
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  #2  
Old 01-28-2019, 10:31 AM
Ristow Ristow is offline
 
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wow. nice torque line.
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  #3  
Old 01-28-2019, 10:50 AM
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babywag babywag is offline
out of order
 
Join Date: Jun 08, 2005
Location: Land of froot loops and cukcoo-nuts, CA
Posts: 9,769
That is a sweet build!
Funny how most folks say a 304 is a turd/too small/needs to be swapped for a 360 or a 401.

I had a Hornet wagon, that will be one fun car w/ that engine!!
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  #4  
Old 01-28-2019, 04:15 PM
jcisworthy jcisworthy is offline
232 I6
 
Join Date: Apr 01, 2016
Location: Amsterdam NY
Posts: 33
This is the first 304 I built because everyone wants the bigger engines. I really enjoyed this build and I am really pleased with the results.

This is a very nice small cube engine and should last many years for the customer.

I did receive a text today, saying the crate showed up to his house, with a picture of the crate next to the Wagon.

He said he is going to make a post on the other forum on the switch from a 6 cylinder to the 304. It will be a good post and I am anxious to see the end results.
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  #5  
Old 03-18-2019, 04:04 AM
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rockosocko rockosocko is offline
232 I6
 
Join Date: Jun 20, 2014
Location: NW, MS 'Yall
Posts: 213
AMC 304, 3.800 bore, 3.44 stroke, ported factory heads, air gap intake 9.72 Compression, Bullet flat tappet hydraulic cam, LS 1.7 ratio, mini shaft conversion

Sir. Can you explain this "LS 1.7 ratio mini shaft"?
And how did you get a 9.72 comp ratio? Mill the heads?

Bullet is just on the other side of town. Bunch of good guys willing to help.
Especially Kirk, but any will help.


Thanks
E
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  #6  
Old 04-04-2019, 06:14 PM
jcisworthy jcisworthy is offline
232 I6
 
Join Date: Apr 01, 2016
Location: Amsterdam NY
Posts: 33
Compression,

58cc heads, .040 compressed gasket with a 5cc flat top piston. Comes in at 10:1. I made a calculation error.


I adapt LS mini shaft rockers to AMC bridge heads. They have a 1.7 rocker ratio
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  #7  
Old 04-04-2019, 06:16 PM
jcisworthy jcisworthy is offline
232 I6
 
Join Date: Apr 01, 2016
Location: Amsterdam NY
Posts: 33
Pistons were set at zero deck
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  #8  
Old 04-08-2019, 07:40 AM
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rockosocko rockosocko is offline
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Join Date: Jun 20, 2014
Location: NW, MS 'Yall
Posts: 213
Really exciting! and wonder what you've squeezed out of the 360?
400-500hp??

And PM me who you're contact is with at Bullet Cams. It's just on the other side of town for me.
Thanks for getting back to me.
E

Last edited by rockosocko : 04-08-2019 at 07:55 AM.
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  #9  
Old 04-08-2019, 12:32 PM
jcisworthy jcisworthy is offline
232 I6
 
Join Date: Apr 01, 2016
Location: Amsterdam NY
Posts: 33
I built a similar 360 for a customer and it made 437 hp and 458 tq at similar rpm ranges

Anyone you talk to at Bullet can help you. I take to whoever answers the phone
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  #10  
Old 04-26-2020, 07:52 AM
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Cliff Cliff is offline
327 Rambler
 
Join Date: Mar 30, 2002
Location: Upper East Tennessee
Posts: 739
My very first engine build was a 304 in a 71 Javelin. The motor was really just blueprinted, plus aluminum pistons at stock CR and a Lunati RV cam. It ran on par with any GM 350 with similar mods. This was in any otherwise stock Javelin with drum brakes, a crappy BW automatic, 3:15 rear, and no ability to handle curves.

Funny thing - all the machine work was done by Jegs, when they were just a little machine shop and speed shop in Columbus. I did the assembly.
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  #11  
Old 04-26-2020, 02:28 PM
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DarkMonohue DarkMonohue is offline
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Join Date: Jul 01, 2012
Location: PNW
Posts: 1,078
Wow! I assumed that the smaller valves would always handicap a 304. Apparently that is not necessarily true. Nice build.
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  #12  
Old 04-30-2020, 03:56 PM
jcisworthy jcisworthy is offline
232 I6
 
Join Date: Apr 01, 2016
Location: Amsterdam NY
Posts: 33
Heads moves really good air for an 1.84 valve. I did a lot of work on them to see how the engine would do. They were around 230 cfm at .525 and kept going to high 350's I believe.

That was with 1.78" tube Doug's headers off my Javelin. A smaller tube header would have made 25 or more ft/lbs of torque.

My friend picked up almost 50 ft/lbs with his 351C engine going from 2", 3.5 collector to 1 3/4 primary, 3" collector.

I have 1 3/4 Hooker headers for a Wagoneer application I believe for my new dyno headers and I am curious to see if torque numbers go up over previous builds.

I have five engines going to the dyno in the next six weeks or so.
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  #13  
Old 05-14-2020, 11:51 AM
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Carnuck Carnuck is offline
 
Join Date: Feb 12, 2011
Location: Gold Bar, WA
Posts: 6,475
My ‘77 AMX 304 moved my ‘73 J4000 with tons of loads no problems. Since the rollover I put it in the garage and someone stole the points Dist and carb (joke is on them. I swapped the original carb with a clapped out one just to keep dirt out)
In fact, the tweakers stole the distributors, carbs, alternators from every motor in my yard and rolled the new 4.0L up to catch rain through the head ports so it’s toast too.
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