I have an opportunity to buy a pair of good 1971 heads off a 360. Is their any difference or downside to putting these on my 1976?
What do these typically sell for?
Thx
Do you know what compression ratios I would have on these and is having the seats hardened even an issue with AMC motors? It’s kind of a big deal on Pontiac motors if you jack up the compression and run ethanol added gas.
I can tell you the alternator bolt is different , no one makes the Delco alt with a 7/16 hole on the 2” mount , I drilled mine out along with 2 mount brackets and the 2 inch spacerwill e wrote: Also, the hole for the alternator bolt is typically larger on the older heads too. I believe 7/16".
So if you do decide to use them, verify the bolt sizes before you assemble them onto the engine. You might need to get replacement bolts. !
will e wrote: ↑Fri Feb 07, 2020 7:08 am Exhaust bolts may be different. On the older heads all 6 exhaust bolts were the larger size (I believe 3/8 inch thread). On the newer heads, don't ask me when they started this, the outer bolts are smaller than the inner bolts which remained at 3/8 inch thread).
Also, the hole for the alternator bolt is typically larger on the older heads too. I believe 7/16".
So if you do decide to use them, verify the bolt sizes before you assemble them onto the engine. You might need to get replacement bolts.
Good info, thx
Good luck!
Many thanks, very helpful.
I was told by PO engine was freshened with new rings on the stock pistons. The RH cylinder head has a small crack that was repaired by some PO at the far rear bottom corner. Can’t tell without getting closer if it was welded or epoxied.Stuka wrote: ↑Thu Feb 06, 2020 10:48 pm 71 would need to have hardened seats installed if you didn't want to have to worry about it. Since you would have them off, it wouldn't hurt, it doesn't cost much (They are like $6 each).
And the compression ratio would depend on what pistons you have, so I cannot answer that.