WebApr 10, 2016 · The general thought with the 400ci SBC is, when they are overbored by more than .030", you start running into overheating issues due to the Siamesed bores. This is not true. The overheating issue usually lies in the coolant passages (sometimes considered steam holes) which allow flow from the block to the head. These are very small holes … WebHead Gasket, Composition Type, 4.200 in. Bore, .039 in. Compressed Thickness, Chevy, Small Block, Each See More Specifications Check the Fit. Fel-Pro Performance Head Gaskets 1014 FEL-1014. 5 out of 5 stars. Part …
Steam Holes, The Cooling Mod For 400-based …
WebOct 28, 2015 · Re: Steam holes plugs 400 sbc ? Post by rfoll » Fri Oct 23, 2015 3:38 pm Putting a tapered plug in the steam hole might produce a crack going to the nearby bolt hole. using a stud instead of head bolts is a good idea due … WebAll aluminum cylinder heads with factory bolts should be torqued to 70-75 ft./lbs using Permatex thread sealant with Teflon. Be sure to follow the proper GM torque sequence, … havilah ravula
Questions about 400 SB with/without Steam Holes (merged)
WebNov 8, 2011 · However, the intake side holes must be drilled at a 45 degree angle to assure you hit the coolant area. There`s likely going to be plenty of controversy over this question as some say do this intake trick and you don`t need steam holes and it worked for them or you`ll hear they weren`t drilled at all and it don`t overheat. WebMar 29, 2024 · For the steam holes near the intake side of the head, these will need to be drilled at approximately a 45 degree angle in order to intersect the water jacket. It would … WebAug 9, 2008 · He recommended to plug the 12 steam holes in the block deck surface with lacing plugs. Also said to install 3/4" pipe plugs in the larger coolant holes just above (or towards the center of the block) the steam holes, then drill a 1/4" hole in these plug. ... Chevy High Performance had an article on this very subject. havilah seguros