Hks Bead Metal Head Gasket Bore Size Help!!!!!!!!

papaleach · 11-17-2006, 12:08 PM

Im changing my head gasket on my 7mgte. I bought an 1.2mm thick HKS metal head gasket bead style, but i noticed that all the HKS head gaskets have a 46mm bore on them and my stock 7mgte cylinder bore is about 44mm. Would the 2mm difference affect the performance of my engine after the rebuild??? Other websites are saying that 46mm is the size of the cylinder bore on a stock 7mgte but the service manual says its about 43mm - 44mm. who is right????? I need HELP ASAP.

Bill UK · 11-17-2006, 01:12 PM

Stock bore is 83 mm diameter that can be re-bored to +.020 thou or + .040 thou, which makes the maximum bore diameter 84 mm approx.
http://www.cygnusx1.net/supra/Librar...ion=EM&Page=75

papaleach · 11-17-2006, 10:24 PM

Quote:

Originally Posted by Bill UK

Stock bore is 83 mm diameter that can be re-bored to +.020 thou or + .040 thou, which makes the maximum bore diameter 84 mm approx.
http://www.cygnusx1.net/supra/Library/TSRM/MK3/manual.aspx?Section=EM&P age=75

will the head gasket work fine for my block though??????

papaleach · 11-17-2006, 10:25 PM

Quote:

Originally Posted by papaleach

will the head gasket work fine for my block though??????

my cylinder bore is 44mm and my head gasket bore is 46mm. Will the 2 mm difference make a difference on performance???

Bill UK · 11-17-2006, 10:50 PM

Quote:

Originally Posted by papaleach

my cylinder bore is 44mm and my head gasket bore is 46mm. Will the 2 mm difference make a difference on performance???

Sorry bit confused on the dimensions you have given, stock bore is 83mm dia (3.267 inch)yours are 44mm (1.732 inch) even if you stated this as the radius and not the diameter, your dimensions don’t add up. What are you using to measure this ?

Bill UK · 11-17-2006, 11:27 PM

Ok! just measured a stock head gasket it measures 85 mm diameter, assuming you mean your gasket measures 86 mm dia I wouldn’t have though the extra combustion chamber area you have gained wouldn’t make any difference. The same could apply to a skimmed head or block or a thicker gasket, providing it isn’t a excessive amount.

11-17-2006, 12:08 PM	#1
papaleach Stock Join Date: Nov 2006 Location: ESSJ, KILLAFORNIA Posts: 7	Hks Bead Metal Head Gasket Bore Size Help!!!!!!!! Im changing my head gasket on my 7mgte. I bought an 1.2mm thick HKS metal head gasket bead style, but i noticed that all the HKS head gaskets have a 46mm bore on them and my stock 7mgte cylinder bore is about 44mm. Would the 2mm difference affect the performance of my engine after the rebuild??? Other websites are saying that 46mm is the size of the cylinder bore on a stock 7mgte but the service manual says its about 43mm - 44mm. who is right????? I need HELP ASAP.

11-17-2006, 01:12 PM	#2
Bill UK AEM EMS Join Date: Jul 2006 Location: UK Posts: 891	Stock bore is 83 mm diameter that can be re-bored to +.020 thou or + .040 thou, which makes the maximum bore diameter 84 mm approx. http://www.cygnusx1.net/supra/Librar...ion=EM&Page=75 Last edited by Bill UK; 11-17-2006 at 01:23 PM. Reason: added link

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Right Head Gasket Bore.	teedoff00	MKIII Supra	0	04-03-2007 12:01 AM
metal head gasket price	noa324	MKIII Supra	1	04-23-2006 03:38 AM

11-17-2006, 11:27 PM	#6
Bill UK AEM EMS Join Date: Jul 2006 Location: UK Posts: 891	Ok! just measured a stock head gasket it measures 85 mm diameter, assuming you mean your gasket measures 86 mm dia I wouldn’t have though the extra combustion chamber area you have gained wouldn’t make any difference. The same could apply to a skimmed head or block or a thicker gasket, providing it isn’t a excessive amount.