I have a 327 in my 71 blazer. I want to keep it and try it out which is why I amrebuilding it. BUT I just found out it is bored .30 over already. And have been told it will have to be bored again. What effect will it being bored .60 over have compared to it stock. Is this smart or will it make my engine to weak. Any help and over all suggestions. Thanks /forums/images/graemlins/1zhelp.gif
CK5
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327 .60 over
- Thread starter shaun
- Start date
Robin
1/2 ton status
What it means is that it's the last time you can bore it out (you can't go more then .060 over).
My machinist encouraged me to go straight to .060 over to get the benefit of the extra cubies. If my calculations are right a 327 .060 over will net you 337
My machinist encouraged me to go straight to .060 over to get the benefit of the extra cubies. If my calculations are right a 327 .060 over will net you 337
Triaged
1/2 ton status
It might cleen up at .040" over. Most pistons now come in that size as well now.
Although .060 over bore is about the limit for a motor that is driven on the street/trail you have got the benefit of an older ( better ) casting block that is a bit thicker and has better nickle contenet than some mid seventy's on up stuff. I would not worry if it does not clean up at .040 and you have to go .060 .
Good luck , Tom
Good luck , Tom
blaz72
Registered Member
.60 over on problem.max on old 327s is 120 over but needs custom pistons and makes walls little thin but will run.
Did it to my 69 camaro no problems.If you like engine .60
is fine.
Did it to my 69 camaro no problems.If you like engine .60
is fine.
jasonkh2tg
1/2 ton status
there are ton of options you have before you..your 327 is the same block as a 350 except for the crank...but all 327 blocks are 2 bolt and all 327 cranks are forged...you could take a 350 crank and up the cubes or take a 350 block and use a 327 forged crank and have a 4 bolt main 327 KEWL.....
but back to the queston .60 over as said before is fine and you should have no problems.....
I have both a 350 4 bolt in the garage and a 327 I myself might make a 327 four bolt...Oh also there are large and small jouranl 327 the journal size was larger on later 327's not sure on the year... /forums/images/graemlins/k5.gif
but back to the queston .60 over as said before is fine and you should have no problems.....
I have both a 350 4 bolt in the garage and a 327 I myself might make a 327 four bolt...Oh also there are large and small jouranl 327 the journal size was larger on later 327's not sure on the year... /forums/images/graemlins/k5.gif
chevyracing
1/2 ton status
67 was the last year of the small journal.
John
John
