Thread: 327 help

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Greetings,


I have a 327 2680 steel crank, 2 bolt main with the original 896 heads I believe, I do not have the casting numbers at the moment for the block, the engine ran fine according to the owner of the hotrod I go it from, however I have a few concerns with the block

well, one real concern.. it has been bored .60 over, I have heard mixed opinions about the max overbore of a 327 block, I am a bit worried the cylinder walls will be too thin to hold up to the strain, the engine is going in a 3100lbs stock car on a 1/4 banked oval, this engine also appears to have been balanced internally or lightened perhaps?, rod caps have machining on them, crank throws have holes cut in them that do not appear factory, has a factory balancer on the crank still

never dealt with a 327 before, not sure what to expect from this engine in this application, my other question would be in regards to getting the most out of this engine, cam/carb/heads/gears etc.

cam I have currently is a 462/469 lift, 262/270 advertised and 218/224 @.50 rpm range from 1300-5600, maybe a little too low for this engine? heads do not appear to be touched, I could have them reworked a bit to better balance it out. we have to run factory intakes, I have an aluminum Qjet intake with a 650cfm Qjet or a 500cfm 4412 with a 1.5" spacer

Corvette "ram style" manifolds as we cannot run headers

2spd powerglide behind it at the moment, though I do have a 4spd Muncie as well, 2.73 gears with a limited-slip, this engine is what I have at the moment so I intend to TRY and make it work for me, for now at least

I apologize if this is the wrong place for these questions due to all the chassis talk, but I figured it was important to know what the engine was being used for

Not sure what your question is but the one concern was 060 over on the bore. This is not a problem as millions of these blocks were used back in the day before the 350 and thousands of them were bored 060 over. This is what you have, run it and enjoy it.

With .060 over you should be fine. I run the Duntov 12/18 solid lifter cam in these engines if it's going in front of an automatic trans or the Duntov 30/30 solid cam if it's in front of a gear box. I'm also talking street engine.

You will hear a lot of people say " with today's cam technology" there are better choices. This is true for the 350 cu.in. and up but with small cu.in engines you really don't need a lot of cam to make em scream. It's more important to realize all your power comes after 4000 rpm's with these engines. Duration is more important. The spec's on the Duntov 30/30 seems to fit what your looking for and always run solid lifters if you can.

So with that said, a 2.73 rear gear is not going to cut it. 3.73 is the smallest I would attempt. RPM'S is the key to power in a 327.

If you have to stay with a factory iron head, a 461 or 462 casting would be best but if your 896 heads have 60 cc chambers you will be fine with those.

If your running it strictly track .060 over is just fine but with more bore are you going to do anything with the heads? My own application was 40 over and took a set of stock heads and punched em out to 202 to matchup with the cam and the valve train components. Just something to think about. Personally I started at the crank and built up from there to maximize each piece of the engine during assembly