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Post by xx2pro4uxx20 on Apr 29, 2021 8:13:16 GMT -5
This is kind of a weird question but I have a 1971 SE 440 HP car but the engine has been swapped with a 1970 440 HP engine. Are there any important differences between them?
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Post by Nacho-RT74 on Apr 29, 2021 9:23:23 GMT -5
same specs engine
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Post by 71se3834v on Apr 29, 2021 20:05:25 GMT -5
Didn't the compression ratio drop in '71 vs '70? Dealer Data states 8.5:1 in '71 although the factory service manual states 8.7:1. Don't know what it was in '70.
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Post by xx2pro4uxx20 on Apr 29, 2021 20:33:30 GMT -5
Didn't the compression ratio drop in '71 vs '70? Dealer Data states 8.5:1 in '71 although the factory service manual states 8.7:1. Don't know what it was in '70. I heard between 9.7 and like 9.3
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Admin
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Post by Admin on Apr 30, 2021 7:55:20 GMT -5
Other makers cut their compression in '71. But most MOPARs had compression drop in '72, not '71. Wikipedia says H.P. ratings were the same in '67-'71. So if it's on the internet, it must be right. Wiki
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Post by xx2pro4uxx20 on Apr 30, 2021 8:25:37 GMT -5
Lol yeah of course. Theres no way the internet can be wrong.
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Post by Nacho-RT74 on Apr 30, 2021 17:19:20 GMT -5
The only diff we could find between both engines is the pistons height, because all the rest is the same... there is a PN catalog which covers 70/71. Would be nice check the pistons available for those years to know if there are diff PN for 70 and 71s 440s... except 6 packs.
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Post by 71se3834v on Apr 30, 2021 20:19:35 GMT -5
1971 Dealer data states "New pistons reduce compression ratio and hydrocarbon emissions." "9.5:1, 370 hp" for the 440. Sorry, the above stated compression ratio was for the 383. Dealer data makes same statement about pistons for the 383. I tend to gravitate, by default, towards 383 info for some reason. 😉
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Post by xx2pro4uxx20 on Apr 30, 2021 21:00:24 GMT -5
1971 Dealer data states "New pistons reduce compression ratio and hydrocarbon emissions." "9.5:1, 370 hp" for the 440. Sorry, the above stated compression ratio was for the 383. Dealer data makes same statement about pistons for the 383. I tend to gravitate, by default, towards 383 info for some reason. 😉 I wonder why you would do that lol. I mean it doesn't matter to me what the difference in specs are since. 70 would be better than 71 if there was a difference. But I'm thinking about trying to find the original engine for my car if that's possible. Probably not but wouldn't hurt to try.
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Post by brigond on May 7, 2021 23:27:43 GMT -5
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