Re: 340 marine engine
[Re: mgoblue9798]
#2934485
06/18/21 10:49 AM
06/18/21 10:49 AM
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Joined: Jan 2003
Posts: 10,931 North Dakota
6PakBee
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I Live Here
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Posts: 10,931
North Dakota
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Didn't even know they made 340 marine engines. I've seen a couple 318 marine engines but that's about it.
"We live in a time when intelligent people are being silenced so that stupid people won't be offended".
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Re: 340 marine engine
[Re: mgoblue9798]
#2934496
06/18/21 11:13 AM
06/18/21 11:13 AM
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Joined: Aug 2003
Posts: 43,719 Bend,OR USA
Cab_Burge
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I Win
Joined: Aug 2003
Posts: 43,719
Bend,OR USA
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I'm going to say they had the same major parts as the car motors did I had a friend who had a Chrysler inboard boat with one of those motors in it back in the mid 1970s I've taken a lot of the early, pre 1972, stock 340 motors apart and none of them had the piston decks above the block decks like Mopar provided NHRA blueprint specs. for I have built more than one "stock" 1971 and 1970 340 340 motors for NHRA racing, which using the NHRA specs allows the piston deck height to be up to +.050 above the block decks When I check those motors before taking them apart they had around 9.6 to 1 or lower actual compression ratios
Last edited by Cab_Burge; 06/18/21 11:14 AM.
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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Re: 340 marine engine
[Re: Cab_Burge]
#2934544
06/18/21 12:37 PM
06/18/21 12:37 PM
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Joined: Mar 2010
Posts: 1,066 Atlanta, GA
mgoblue9798
OP
super stock
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OP
super stock
Joined: Mar 2010
Posts: 1,066
Atlanta, GA
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A lot of the 340 marine engines, maybe all, used 318 heads. Trying to find out how much compression Chrysler was able to get by running on raw water cooled inboards back then. Wondering how high I can make compression on a small block 5.9 marine engine with magnum heads without causing problems.
Cal I have had similar experience with the older 340s. If I remember right blueprint spec had the early pistons at .018 above the deck for auto engines. Actual was much closer to zero from the ones I have seen.
Last edited by mgoblue9798; 06/18/21 12:40 PM.
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Re: 340 marine engine
[Re: Cab_Burge]
#2934576
06/18/21 01:53 PM
06/18/21 01:53 PM
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Joined: Jan 2005
Posts: 12,478 Kalispell Mt.
HotRodDave
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Posts: 12,478
Kalispell Mt.
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I had a 70 340 boat motor, it had low compression cast pistons, cast crank, even had open chamber 318 small port heads from the factory and reverse rotation crank in single engine application. I still have the 4bbl intake off it, small port iron single plane with a very dramatic carb pad angle. The block would have been the only thing worth keeping butt unfortunately it was cracked.
I am not causing global warming, I am just trying to hold off a impending Ice Age!
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Re: 340 marine engine
[Re: HotRodDave]
#2934632
06/18/21 05:16 PM
06/18/21 05:16 PM
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Joined: Nov 2003
Posts: 12,521 Western Colorado High Desert
moparmarks
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I Live Here
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Western Colorado High Desert
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I have a 1975 Super Bee III 340 boat motor. It is standard rotation but I haven't checked the heads. 318 small port heads would make since beings that a boat motor needs low end torque and is pretty much done at 4500 rpm.
72 Satellite Sebring Plus 440, 72 Dart 5.9 4-spd, 68 Valiant, 73 W200, 78 D100 sb, 78 D200, 98 DAKOTA, . Moparmarks Parts & Restorations Desert Mopar Metal Grand Jct. CO 970-261-7039 http://moparmark.com/motormangj@gmail.com
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