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304 on the dyno

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jcisworthy View Drop Down
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Post Options Post Options   Thanks (3) Thanks(3)   Quote jcisworthy Quote  Post ReplyReply Direct Link To This Post Topic: 304 on the dyno
    Posted: Jan/11/2019 at 1:46pm
304 build on the dyno. 

3.800 bore, 3.44 stroke, 312 CID, 9.72 compression, ported iron heads with 1.84/1.5 valves, LS 1.7 ratio mini shaft rockers, Molnar rods, Racetec pistons, 5cc flat top two valve reliefs, .040 quench with 3.810 bore, .040 thick Cometic MLS gaskets, air gap intake, factory appearing deep oil pan, Doug's 1 7/8 headers, Quick fuel brawler 600 CFM mechanical secondary carb, billet MSD type ignition

Best pull, 381.8 TQ @ 3600, 363.3 HP @ 5500





Specializing in engine building and cylinder head porting

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Post Options Post Options   Thanks (1) Thanks(1)   Quote jcisworthy Quote  Post ReplyReply Direct Link To This Post Posted: Jan/11/2019 at 1:49pm
More pictures, 


Specializing in engine building and cylinder head porting

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Post Options Post Options   Thanks (0) Thanks(0)   Quote 1982AMCConcord Quote  Post ReplyReply Direct Link To This Post Posted: Jan/11/2019 at 1:51pm
Wow! Now that is more than respectable!!!!!!!!!!! Good work!!!!!!!!!!!!!!!!!!!!!! This 304 would be a lot of fun!!!!!!!!!!!!! 
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Post Options Post Options   Thanks (1) Thanks(1)   Quote jcisworthy Quote  Post ReplyReply Direct Link To This Post Posted: Jan/11/2019 at 2:01pm
Specializing in engine building and cylinder head porting

https://www.rbjracing.com
Phone Number 518-915-3203
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Post Options Post Options   Thanks (0) Thanks(0)   Quote JolleyGreenSST Quote  Post ReplyReply Direct Link To This Post Posted: Jan/11/2019 at 2:14pm
Great job! My only questions are for such a low rpm range why the need for Molnar rods? And why again did the dyno run end at 5500rpm? 
"God is good all the time and all the time God is good!"
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Post Options Post Options   Thanks (0) Thanks(0)   Quote shootist Quote  Post ReplyReply Direct Link To This Post Posted: Jan/11/2019 at 2:20pm
Now that is pretty impressive numbers for a little ole 304 AMC motor. 
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Post Options Post Options   Thanks (0) Thanks(0)   Quote jcisworthy Quote  Post ReplyReply Direct Link To This Post Posted: Jan/11/2019 at 2:23pm
Originally posted by JolleyGreenSST JolleyGreenSST wrote:

Great job! My only questions are for such a low rpm range why the need for Molnar rods? And why again did the dyno run end at 5500rpm? 

I use Molnar rods in everything. For a little extra money it does not make sense not to. 

It was starting to nose over so that is where he pulled it to. 

It will pull strong to 6K no problem
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Post Options Post Options   Thanks (2) Thanks(2)   Quote EVF_Sportabout Quote  Post ReplyReply Direct Link To This Post Posted: Jan/11/2019 at 4:35pm
What I can't get over is how high and flat that torque curve is it hits 350 @ about 2900 and just stays up there all the way through.  We had one pull where it hit 381.8 @ 3600 RPM.  Its going to be a fun driving Sportabout yes its going in a wagon!
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Post Options Post Options   Thanks (0) Thanks(0)   Quote jpnjim Quote  Post ReplyReply Direct Link To This Post Posted: Jan/11/2019 at 5:54pm
Sweet parts combination!
 That Air Gap was born to sit on a set of ported 304 heads like that,

 it sounds amazing on the dyno and ought to RIP in a Hornet Wagon!

Nicely done John Clap



edit,
couple questions,
did you leave the intake divider intact on this build?
did you happen try a pull with an open carb spacer?

That 600 Double pumper is probably the perfect match for this engine,
 just curious if it left any power on the table at the very top (especially if the full divider is intact).





Edited by jpnjim - Jan/11/2019 at 6:10pm
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Post Options Post Options   Thanks (1) Thanks(1)   Quote Buzzman72 Quote  Post ReplyReply Direct Link To This Post Posted: Jan/11/2019 at 6:26pm
After seeing these numbers, can we all stop telling newbies with a 304 to use it for a boat anchor and get a 360 instead?

Some of us love seeing what can be done with small cubic inch naturally aspirated engines.
Buzzman72...void where prohibited, your mileage may vary, objects in mirror may be closer than they appear, and alcohol may intensify any side effects.
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