Register now to get rid of these ads!

Technical 327 experts question?

Discussion in 'The Hokey Ass Message Board' started by Duke, Mar 14, 2015.

  1. Duke
    Joined: Mar 21, 2001
    Posts: 723


    Looking at a rebuilt 1965 327, the guy built it with 305 heads (early 80s), the cam is a isky with 184 intake duration and 194 exhaust, lift is 368, 398. It would be going in my A coupe in front of a turbo 350. How is the combination of parts in this motor going to run? He claims 9.5:1 compression and that it will be powerful motor. That cam seems like stock 350 specs? Thanks
  2. Depends on which 305 heads for the compression ratio as well as piston style. Probably flat tops so the head Casting #s tell you the CC.

    My prediction is that it will run quiet well and pretty peppy in normal street driving and you'll be leaving some power on the table at WOT in the higher RPM range when the heads stop breathing. Lots of fun light to light, no racing trophies
  3. 56sedandelivery
    Joined: Nov 21, 2006
    Posts: 6,695

    Member Emeritus

    416 casting 305 heads come in around 58cc's; the 601 casting are 53cc's. Either can be found with the 1.84 intake valves, but both can also be upgraded. I would guess the CR in the 9.5 to 10:1 range with the 416 heads and slightly more with the 601's., and the cam is nothing to speak of; I'd at least stick an RV type of grind in the motor, and stay away from the "thumper" or higher lift/longer duration cams. I am Butch/56sedandelivery.

    Plus, the 305 heads will have hardened seats.
    Last edited: Mar 14, 2015
  4. Duke
    Joined: Mar 21, 2001
    Posts: 723


    Thanks guys. I am wondering if he has the wrong specs on the cam as he thought it was an isky performance cam. I am waiting on head numbers as he is 1 hour drive away from me. I am looking at this motor as it is pre 67 with the pcv provision in the back of the block. I currently have a 68 327 without the hole, but the casting has the raised flat spot where the pcv would go. Has anyone ever drilled the holes and added a pcv to a 1968 block? I don't want to drill my intake as it is an early weiand with 4 97s and my valve covers have no holes (don't want to drill them).

  5. Ok, first off the hole is for a road draft tube. You certainly can stick a PCV valve in there But You will need the inner baffle, looks like a soup can.

    Not sure about drilling the block but I'd be that it can be done.
    Last edited: Mar 14, 2015
  6. pitman
    Joined: May 14, 2006
    Posts: 5,151


    GM had several mid range cam profiles that were great for street use. In the '70's I went w/a 340 hp model rather than the 365 hp, it pulled nicely. Came on at about 3500 rpm.
  7. cheepsk8
    Joined: Sep 5, 2011
    Posts: 581

    from west ky

    I am with you Duke on the cam, it seems a little lame. Not saying it wont run ok, but a 327 can stand more, even with the auto. I am building a flat top 327 with these heads and a 327-375 hp cam or a grind very similar. These 461s are fitted with big valves and come in at 62 cc. I guess the compression to be 10:1 maybe. I have built several 327s , but never one with late model heads. I like big valves on the 327. Let us know how it performs. Mine is going in my avatar so the weight won't be a lot different.

    Attached Files:

  8. olscrounger
    Joined: Feb 23, 2008
    Posts: 4,407


    have done a few 327's Last one was a flattop piston mtr with 461's lightly ported with 1.94 intakes and 1.60 exhaust. Cam was a Crane hydraulic 266 /440 with a factory 66 aluminum intake and balanced. Real spunky little mtr in a 40 coupe. Cam numbers seem very low and I have no experience with 305 heads. The cam specs may be at the cam without the rocker ratio but then it looks too radical like 276/290 and 500+ lift--don't know
  9. aerorocket
    Joined: Oct 25, 2007
    Posts: 488

    from N.E. P.A.

    The cam numbers do seem wrong; however the rocker arm ratio does not change the duration as is stated above.
  10. Devin
    Joined: Dec 28, 2004
    Posts: 2,351

    from Napa, CA

    My 327 has 461 heads with 62 cc chambers, flat tops and a steel shim head gasket for 0.035" quench and about 9.8:1 static compression. The cam is solid lifter with 230/236 duration (0.016" lash) and 0.488"/0.501" lift. Runs like a raped ape with a 4 speed and 4.11s in my roadster and is very street able as well.

Share This Page

Register now to get rid of these ads!


Copyright © 1995-2021 The Jalopy Journal: Steal our stuff, we'll kick your teeth in. Terms of Service. Privacy Policy.

Atomic Industry
Forum software by XenForo™ ©2010-2014 XenForo Ltd.