![]() |
Register or Log In To remove these advertisements. |
|
|
|
Thread Tools | Display Modes |
![]() |
#19 | |
Registered User
Join Date: Nov 2012
Location: Mexico, NY
Posts: 559
|
Re: First motor start, terrible knocking
Quote:
Let us know the cylinder head casting #'s when you get a chance. Last week there was a guy asking if he could bolt on a pair of Vortec heads and replace a set of 882 heads. I told he he could but needed to consider the change in compression because the vortec heads were 64cc's vs the larger 74cc's of the 882 heads. I gave an example with flat top pistons with -4cc valve reliefs and a .040" quench clearance the compression was 9.5:1 with the larger heads but jumped to something like 10.5:1 (IIRC) by bolting on the smaller heads. The example I chose sounds like it could resemble your build but obviously just a guess because you don't know your deck height. It wouldn't be uncommon to zero deck a block and run flat top pistons and that head gasket like you have. Just something to be aware of.
__________________
'84 K10, SM465, NP208, 3.42 Gears, 33x12.5-15 GM 4 bolt 880 roller block, 062 Vortec Heads Comp Cams XR258HR-10, MSD Street Fighter HEI Edelbrock: Performer Intake 2116, 1405 Carb Long tube headers, 2.5" duals to Flow Master Super 40's Vortec Engine Build Last edited by Marshy; 10-03-2016 at 12:09 PM. |
|
![]() |
![]() |
Bookmarks |
|
|