Just joined? Please introduce yourself.
Page 1 of 2 12 LastLast
Results 1 to 10 of 19

Thread: 383 rotating assembly's

  1. #1
    Member jims56's Avatar
    Join Date
    Jan 2019

    Member #:4078
    Location
    Arizona
    Posts
    46

    383 rotating assembly's

    Looking for 383 rotating assembly suggestions. Looking to turn my L31 vortex 350 into a 383. Use the stock 64cc heads, it's a newer crate motor with 7000 miles on it now. Will be a street driver. What i read read so far scat comes in first am I wrong here?
    Jim
    Last edited by jims56; 07-11-2020 at 11:53 AM.
    Retired USAF

  2. #2
    Registered Member
    Join Date
    May 2012

    Member #:625
    Posts
    3,409
    I have never bought an assembly, but have had good success with their cranks. Great choice in wheels Jim.

  3. #3
    Member jims56's Avatar
    Join Date
    Jan 2019

    Member #:4078
    Location
    Arizona
    Posts
    46
    Thanks markm.
    Retired USAF

  4. #4
    Registered Member 56ls408's Avatar
    Join Date
    Jul 2020

    Member #:4403
    Location
    Indianapolis Indiana
    Posts
    15
    Quote Originally Posted by jims56 View Post
    Thanks markm.
    used they're 3.75 crank & I beam rods in a 383 balanced well no issues I felt the rods were a nicer set than Eagle's I beams also used a set of I beams in a small journal L79 327 in a 65 vett i had another company that isn't heard a lot from is Molnar Technology Tom Molnar was the lead designer at Oliver rods then started K1 later sold the company to weisco but ran it for 5 years because of a no compete contract then started his own company several years ago like Eagle Scat & even Callis lower end forgings are offshore but 100* of the machining is done in-house to very high standards I have his crank & rods in my 408ls3 plus if you call he's who you talk with prices are in the same range

  5. #5
    Registered Member 55mike's Avatar
    Join Date
    Mar 2012

    Member #:225
    Location
    Annabella Utah
    Posts
    211
    I'm going to build a 383 in the future. My plan is to use 12cc dish pistons, with my AFR 190 heads that have been decked to achieve 64cc chambers. The plan is to have about 10.5 to 1 compression (might be a touch higher). The block is a seasoned 350, 2 piece rear main, and I'll use a flat tappet camshaft. I'm planning to use a CompCams XE 274 camshaft. My question to the forum is, has anyone used the CompCams XE 274 in a 383? Comments about the XE 274...?

  6. #6
    Registered Member BamaNomad's Avatar
    Join Date
    Nov 2016

    Member #:3217
    Location
    Rocket City, USA (Huntsville, AL area)
    Posts
    3,774
    Mike, Are you SURE you can achieve 10.5 comp with 12 cc DISH pistons?? What is different here... mid-late sixties and early 70 350s wtih 64 cc heads generally had a small dome on the pistons for 10.5 comp.... What am I missing here??

  7. #7
    Registered Member
    Join Date
    May 2012

    Member #:625
    Posts
    3,409
    Quote Originally Posted by BamaNomad View Post
    Mike, Are you SURE you can achieve 10.5 comp with 12 cc DISH pistons?? What is different here... mid-late sixties and early 70 350s wtih 64 cc heads generally had a small dome on the pistons for 10.5 comp.... What am I missing here??
    A lot that extra 1/4 inch of stroke makes a world of difference. A flat top 283 with a 64 cc head is around 8-1.

  8. #8
    Registered Member 55mike's Avatar
    Join Date
    Mar 2012

    Member #:225
    Location
    Annabella Utah
    Posts
    211
    Quote Originally Posted by BamaNomad View Post
    Mike, Are you SURE you can achieve 10.5 comp with 12 cc DISH pistons?? What is different here... mid-late sixties and early 70 350s wtih 64 cc heads generally had a small dome on the pistons for 10.5 comp.... What am I missing here??
    Yes sir. Actually, according to my compression ratio calculator, it will be 10.28 to 1 with +12cc pistons. Only variable I don't know for 100% will be final deck height. So, I'm assuming it will right at 0. As for "what's different here"... as markm said, it's the fact the stroke is longer..

  9. #9
    Registered Member BamaNomad's Avatar
    Join Date
    Nov 2016

    Member #:3217
    Location
    Rocket City, USA (Huntsville, AL area)
    Posts
    3,774
    Quote Originally Posted by 55mike View Post
    Yes sir. Actually, according to my compression ratio calculator, it will be 10.28 to 1 with +12cc pistons. Only variable I don't know for 100% will be final deck height. So, I'm assuming it will right at 0. As for "what's different here"... as markm said, it's the fact the stroke is longer..
    Hmmm... 12cc pistons to ME means that there is a 12cc DOME on top of the piston (the OPPOSITE of a dished piston)... or am I missing something here?

  10. #10
    Member jims56's Avatar
    Join Date
    Jan 2019

    Member #:4078
    Location
    Arizona
    Posts
    46
    That's my plan also to use the +12cc piston.

    https://www.summitracing.com/parts/esp-b13504l00053
    Retired USAF

Page 1 of 2 12 LastLast

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •