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327 Top End Q

934 Views 7 Replies 2 Participants Last post by  pdq67
I am finally getting ready to finish off a rebuild on the 327 for my 64 300 sedan and was wondering what top end you guys would recommend.

Here are the specs so far on the build:

'64 327 Small Journal Block, with 4 bolt splayed caps. Stock 327 crank std/std. An old, but still new, set of Eagle H-Beam Rods. Forged Dome Pistons. I would anticipate 11.4:1 with a 64cc head. The machine work is already completed and the short block is together.

I always used a close ratio Muncie and will likely use the M22 I have this time around. Although I do also have a fully built TH-350 sitting in the garage that may find its way in there at some point. Torque Converter would be selected after the rest of the combination is done and if I go that route.

I am using a 4.56 gear.

Street Manners are not a major concern. This vehicle is a toy that only sees short trips. It has no options so idle quality is also not much of a concern.

I was looking at the new AFR heads either 180 or 195cc. Should I be looking elsewhere or would one of those fit the bill? I am also on the fence somewhat about whether to select the street or comp heads. Any thoughts?

I will select a cam after I finalize my head and intake selection. Although, in the past I always just called G.K. and this time around that is no longer an option. So, if someone wants to recommend a particular cam or cam manufacturer I am all ears.

Finally, on the intake. Would I be correct that I should just pick up a new RPM intake and port match it to the heads rather than attempt to use any of the following which I already have: Edel TM-1, stock "Z/28" intake, or Holley 300-36?

Thanks for the help.
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I cant say on the AFR heads as i dont use them, If you really have 11.5:1 compression i would use a 256/264 @.050 .545/.563 105° lobe center cam with your 4 speed unless your looking for a solid roller

I would look at a set of Dart 200cc heads with springs to match the cam and rpm band which it will make power in. If your looking for a solid roller i suggest a 260/268 @.050 .670/.625 106° lobe center

Either cam would be great with that head, 4.56 gears and your 4 speed. I would expect 7,400rpm to be a good shift point to ET quickest, on the street it will rev like crazy. Either of those cams should be installed 3° advanced, we have used both of them, both we installed 3° advanced, that would put the ICL @102° on the flat tappet and 103° on the solid roller. Both grinds are from Crane Cams

I would suggest a Dart or Edelbrock intake and a 750 carburetor.
Question, Is this the piston you have? Can you tell us a brand and part number on the piston so we can get a rough figure on what your compression will be before you make decisions? The information above that i posted will be good if you do indeed have 11.5:1 with the heads you will be using which we will assume will be a 64cc chamber??

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I will have to check the pistons to see if there are any numbers on them but I don't believe there are. I know they were different than the stock replacement L-79 pistons. The dome is different back when I got them I held them next to a stock GM piston. I can't remember if the dome was slightly higher or just shaped different than the stock piston. Now, mind I purchased these pistons more than a few years ago and am finally using them. So, I have no idea anymore what brand they are. As far as compression I have going off of what my machinist stated it would be w/ a 64cc head. That being on the better side of 11.5:1.

Any particular Dart head that you would recommend? I would assume you were referring to their PRO 1 head, but I hate to make an assumption.

Pro 1 or Iron Eagle 200cc, buy them bare if you go with a solid roller {which i suggest due to only a few dollars more and better performance:D} so you can install Ferrea valves and matched springs although Dart valves seem to be pretty good also
Yeah, I have been definitely kicking around the idea of the roller cam since in the grand scheme of things it really is not that much more money. That and it would be interesting, at least for me, to see if there is a benefit as I always used a flat tappet before.

Also, I checked and there are no numbers on the pistons.

Finally, I am a little surprised that no one else jumped on this thread. I definitely figured that someone would opine on the AFR heads. Since that has not happened I am going to consider the Dart heads. I did have a friend of mine who runs a stock car recommend the Iron Eagles stating that if he could he would use them. But apparently the class rules do not allow them.

Anyway, Butch thanks for the help.
If you have only used a solid flat tappet, when you go to a roller you will look like my green buddy below:


Here are the complete cam specs on the cam i suggest:
290/306 @.020" 260/268 @.050" .670/.625 106° lobe seperation with 4° advance built in but the timing events act as if it were only 2° advanced

If you want 7,600rpm i would go with the following cam but you will need 11.5-12:1 compression
298/314 @.020" 268/276 @.050 .670/.625 106° lobe seperation with 3° advance built in
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