How thin of head gasket can i go?
11-04-2010, 07:29 PM
#1
How thin of head gasket can i go? He guys looking at making up some compression and need some feedback from some of your tech guys. Its a forged 355 with a 0.007 deck height. Im milling my AFRs from 64 to 60cc with a 0.039 gasket it will put me at 10.7:1 and with a thinner 0.029 gasket would be 10.99:1. I know the clearances will be very close im just wondering what you guys think if this is a good idea or stick with the bigger gasket? Heads have a 2.055/1.6 valves if this makes a difference.
Thanks
Thanks
11-05-2010, 07:56 AM
#7
Ill have to wait untill the heads are milled down to know for sure what the PV clearance will be. I just figured i would lay it out there to see if anyone would say its safe or better idea to stay with the bigger gasket. I know that the previous owner of the shortblock ran a set of stock heads with a .029 gasket at this deck height which maybe luck i dont know as there wasnt any marks on the pistons. But i know i have a touch more room having a little more material then stocker heads. Im not a big tech guy im still learning as i go and not sure what quench is or what quench i should be at?
Trending Topics
11-05-2010, 11:15 AM
#9
http://www.rbracing-rsr.com/squishcalc1.html (motorcycle discussion, but conceptually identical)
http://www.chevyhiperformance.com/te...ide/index.html (more pictures, decent article relevant to GM wedge heads)
Should explain it for you- remember about room for a little carbon buildup. Rod stretch would be a real concern with an LS1, not nearly as much with the LT1.
http://www.chevyhiperformance.com/te...ide/index.html (more pictures, decent article relevant to GM wedge heads)
Should explain it for you- remember about room for a little carbon buildup. Rod stretch would be a real concern with an LS1, not nearly as much with the LT1.
11-05-2010, 07:54 PM
#11
http://www.rbracing-rsr.com/squishcalc1.html (motorcycle discussion, but conceptually identical)
http://www.chevyhiperformance.com/te...ide/index.html (more pictures, decent article relevant to GM wedge heads)
Should explain it for you- remember about room for a little carbon buildup. Rod stretch would be a real concern with an LS1, not nearly as much with the LT1.
http://www.chevyhiperformance.com/te...ide/index.html (more pictures, decent article relevant to GM wedge heads)
Should explain it for you- remember about room for a little carbon buildup. Rod stretch would be a real concern with an LS1, not nearly as much with the LT1.
stroke, rod length, rod/piston material, wall clearance, rpm, etc. all come into play when you're pushing the limits on quench. I wouldn't run less than .035 on a 4" bore sbc unless you know what you're doing. I was at ~.032 and kissing, maybe it was just on a missed shift or something. But running it that tight didn't prevent me from detonating on pump gas and the resulting rebuild. I went .038 on this motor since i'll be revving to 8000, and I feel comfortable there. PTV shouldn't be an issue with 5cc reliefs unless you're running ALOT of camshaft.
