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jeep 4.0 pistons in a 304 |
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pipefactory 
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Joined: Jul/27/2012 Location: Superior, Wi Status: Offline Points: 405 |
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 Topic: jeep 4.0 pistons in a 304Posted: Sep/19/2019 at 7:49am |
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i'm thinking of a cool budget 304 for my dayly driving 71 javelin.
I have 2 new sets of jeep 4.0 pistons I've been trying to sell, when I had and idea after looking at the 304 build that was just on here. It will make a 324.55 CI and 8.98 to 1 compression. I was thinking of a cam Crane sells that is sort of close to a 401 stock cam. any thoughts? Edited by pipefactory - Sep/19/2019 at 5:31pm |
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Face distorting torque
10.99@121 mph |
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PROSTOCKTOM
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Posted: Sep/19/2019 at 6:53pm |
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While I am not up on the dimensions on either piston it sounds like a great plan to me if you have already have the parts. Some people get all hung up on the idea of mixing parts, but I have mixed and match parts from many makes and brands over the years. The math doesn't lie and if it fits, it fits.
Sound like it would be a really nice up grade from a stock 304. Tom
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Molnar Technologies Full Service Dealer - Crankshafts & Connecting Rods
1969 AMC Rambler Rouge Race Car 1974 AMC Hornet Hatchback, Wally Booth Outlaw Nostalgic Pro Stock Race Car Project |
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Heavy 488
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Posted: Sep/19/2019 at 7:22pm |
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Have you checked if the 304 block can handle that much overbore? You're going from 3.75 to 3.88
Edited by Heavy 488 - Sep/19/2019 at 7:24pm |
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pipefactory
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Posted: Sep/19/2019 at 7:55pm |
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When I disassemble I'll have it sonic checked
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Face distorting torque
10.99@121 mph |
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Boris Badanov
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Posted: Sep/19/2019 at 8:04pm |
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I kind of think it is not a good idea just for saving money.
I know nothing about the 4.0 "Jeep" motor but... Pin to crown height and wrist pin diameter need to be the same. Then there's the valve relief issue. I would rather see a 401 crank in it than 4.0 pistons. No matter. You need to do the math before building a Franken Motor. Not that I would not..... I LIKE the idea. |
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Gremlin Dreams
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PROSTOCKTOM
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Posted: Sep/19/2019 at 8:23pm |
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After reading the above post and seeing how much of a difference in bore diameter I am going to guess it's not going to work. I can't imagine the block will allow for a .130" overbore to the point I wouldn't even spend the money on the sonic testing. Build yourself a 4.0 with a small power adder with 5-8 pounds of boost and use those pistons.
Tom
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Molnar Technologies Full Service Dealer - Crankshafts & Connecting Rods
1969 AMC Rambler Rouge Race Car 1974 AMC Hornet Hatchback, Wally Booth Outlaw Nostalgic Pro Stock Race Car Project |
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pipefactory
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Posted: Sep/19/2019 at 8:24pm |
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Wrist pin is the same compression high is .008 shorter so it'll be .020 in the hole
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Face distorting torque
10.99@121 mph |
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brownspirit
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Posted: Sep/19/2019 at 9:07pm |
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It’s been done, the 304 blocks can handle the overbore. I don’t know if it’s a good idea, but it has been done. A sonic check is definitely required. Andy
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69' BBB AMX 390/4-speed
69' s/crambler project 69’ International F210d Cummins/5+4 |
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billd
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Posted: Sep/19/2019 at 9:28pm |
You do not want it that deep. You need some quench. Add the thickness of the head gasket to that .020 in the hole and you have a fair space up there. That's all my opinion based on some experiences. |
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pipefactory wrote: