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304 high compression pistons? |
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crusher_gremmy 
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Joined: Aug/08/2022 Location: okc Status: Offline Points: 6 |
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 Topic: 304 high compression pistons?Posted: Aug/08/2022 at 9:08am |
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I got a killer deal on a freshly machined .030 over 304 long block and I'd like to build a really hot high-winding full race motor out of it mostly just for fun but also for experience in engine building. To go along with a 73 gremlin x I saved from the crusher and I'm thinking drag car. New to AMC stuff mostly a Ford guy.
From reading it seems like there used to be some flat top 304/258 pistons off the shelf. They appear to no longer be available but perhaps I'm not looking for the right part #s. Are there any out there still being made? Or would I have to acquire some custom pistons? I've also read about people using chevy 305 pistons but I'm a little unclear on the machine work involved. I'd prefer not to have the block decked by an extreme amount. Thanks.
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crusher_gremmy
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Joined: Aug/08/2022 Location: okc Status: Offline Points: 6 |
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Posted: Aug/08/2022 at 1:35pm |
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The more I read, the more it seems that custom pistons are probably what will be needed to make this happen
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Javelin_GT
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Joined: Feb/15/2008 Location: Colorado Status: Offline Points: 1068 |
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Posted: Aug/08/2022 at 1:53pm |
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Call RaceTec pistons. I know a guy who builds a ton of inline 6 jeep engines. I am sure can help you order whatever you want for your 304. PM for his info. |
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bbgjc
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Joined: Nov/24/2009 Location: No.VA Status: Offline Points: 1665 |
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Posted: Aug/08/2022 at 2:16pm |
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Hey Adam,
Can you send me the Inline guy's info. I'm building a stroker 4.7 and he may have a few part numbers in his head that will save me some time. John
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crusher_gremmy
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Joined: Aug/08/2022 Location: okc Status: Offline Points: 6 |
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Posted: Aug/08/2022 at 6:20pm |
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Thanks, I'll give them a call
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tufcj
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Supporter of TheAMCForum Joined: Jul/10/2007 Location: Watkins, CO Status: Offline Points: 4097 |
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Posted: Aug/08/2022 at 7:26pm |
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TRW made the L2340, which was 10.5 compression, and required notching for valve clearance (I ran a .488 lift cam). They've been out of production for years. Fun little engine. I ran 1.94/1.50 Chevy valves, had the rods shot peened, all balanced, with a Torker manifold and Holley 650 carb. Easily revved to 6000. Made around 330 HP. Bob tufcj
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69 AMX
74 Javelin AMX 67 Rogue If you need a tool and don't buy it... you'll eventually pay for it... and not have it. Henry Ford |
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crusher_gremmy
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Joined: Aug/08/2022 Location: okc Status: Offline Points: 6 |
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Posted: Aug/08/2022 at 10:22pm |
Thanks for the p/n. Every now and then stuff like that pops up on ebay or racingjunk - who knows, I might get lucky. Hoping to build something similar to yours or the one in this thread: https://theamcforum.com/forum/304-on-the-dyno_topic98091.html Should be pretty good for sending the little gremmy down the track
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Mr_Roboto
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Joined: Jun/12/2022 Location: Wisconsin Status: Offline Points: 221 |
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Posted: Aug/09/2022 at 8:54am |
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My advice for ebay is if you have the time set a search alert. I scored what were probably 2 of the last sets of new head gaskets in existence for a 350 Pontiac. I will admit I probably had that alert on there for 2+ years though.
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JGRANTAMX
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Joined: Jun/02/2017 Location: Maine Status: Offline Points: 1703 |
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Posted: Aug/09/2022 at 12:59pm |
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I bought a used set of 304 +.030" forged flat top pistons here a few months ago they cleaned up nice and measure good also, I bought new wrist pins for them. I might change the specifications of the project and not use them, depending on when you need pistons these might be available for much less than new pistons.
J  |
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crusher_gremmy
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Joined: Aug/08/2022 Location: okc Status: Offline Points: 6 |
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Posted: Aug/09/2022 at 1:17pm |
Sure shoot me a pm if you decide to sell at some point. Not sure what my timeline is still gathering info & parts
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tufcj wrote: