Thread: best way to get 340

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Originally posted by Matt167
nothing's cheap for mopar. cheapest you can do is find 360 heads from a pre '71 motor, intake/ carb/ mild cam and a set of headders.

Hold onto the 340 heads, they'll flow better than 360 heads.

Originally Posted by techinspector1

Hold onto the 340 heads, they'll flow better than 360 heads.

....They are the same.

Originally Posted by sox

....They are the same.

I yield to your superior knowledge. Just repeating what I've been told by Mopar guys....larger valves in 340 heads, etc.....

Some 340 heads are better than the common 340-360 heads, bigger valves, etc. I don't have the info right in front of me but any Mopar hop-up book will give you the straight dope.

The 360 came out in '71. 340/360 heads were open chambered and cc'd between 68-75. 68-72 most of the 340s had the 2.02 intake valves and all340/360 heads had 1.60 exhaust valves. The exhaust ports and intake ports were the same. The 360 had 1.88 intake valves....the only diff.
In pre 73 340s they had forged cranks and pistons that sat out of the hole hence the higher compression. After 72 the 340's pistons sat in the hole that lowered the compression and also used a cast crank.

What year is your 340 mopar_man?.....also check out moparts.com all the mopar info you will ever need.