Register or Log In To remove these advertisements. |
|
|
|
Thread Tools | Display Modes |
04-03-2018, 08:58 AM | #1 |
Registered User
Join Date: Mar 2013
Location: Campbellsville, KY
Posts: 888
|
327 overbore, .010>.020>.030?
It seems a lot of times the first overbore on a SBC is .030". The correct ("657" code YS) block I've procured for my Suburban is standard bore, and when I rebuild it I'd like to take as little as possible so as to allow another rebuild in the future. It'll be a bone stock rebuild so surely pistons are available in .010 or .020. Is it very uncommon for the wear to clean up at less than .030", or is it just cheaper to overshoot and have more of a gaurantee of cleanup with the greater overbore?
__________________
Alex V. ------ 1967 C10 Suburban, 350/NP435, Green/Green, PS, PB, HD cooling, charging, shocks, and springs. 1985 GMC C3500 SRW, Sierra Classic, 454/TH400, white/blue. |
04-03-2018, 09:26 PM | #2 |
Account Suspended
Join Date: Jun 2015
Location: No longer here
Posts: 1,000
|
Re: 327 overbore, .010>.020>.030?
It all depends on cylinder taper and wear in each cylinder, not every block is the same....measure every cylinder than you will know what you need to do.
OK...measure twice, bore once....its like weighing each rod, you take the rod that weighs the least and make every rod the same weight....but you have to weigh each rod first.... Last edited by YoungPup1977; 04-05-2018 at 07:53 PM. |
04-03-2018, 09:35 PM | #3 | ||
"I ain't nobody, dork."
Join Date: Sep 2007
Location: Whidbey Island, Washington
Posts: 8,947
|
Re: 327 overbore, .010>.020>.030?
The 350 in my 1972 is the original block and that engine had a lot of miles on it before I rebuilt it. My machinist took it .020 over and it cleaned up fine. I was pleasantly surprised as I was expecting it to go at least .030. Just make sure you tell your machinist what you are looking for. It might be fine at .020, but it might need to go bigger.
Gary
__________________
'cuz chicks dig scars... My 1972 GMC 1500 Super Custom (Creeping Death) "long term" build thread. The Rebuild of Creeping Death after the wreck Quote:
Quote:
|
||
Bookmarks |
|
|