head compatability - Land Rovers Only

MuddyRangeRover · 06-09-2007, 12:25 PM

Will heads from a 4L 97 disco1 work on the block of a 1990 RRC 3.9?
One has 8 bolts one 12

rqsall · 06-09-2007, 03:45 PM

It will fit as far as I know. But I'm pretty sure the disco has 10 bolts and the range rover 14. You can omit the outer row of bolts without problems, and you should replace the metal gasket with a composite one.

Paul Grant · 06-09-2007, 04:26 PM

You can use the heads off the Disco but make sure you use the composite gasket and you absolutely must get new head bolts. Call Rovers North and they'll set you up with everything you need.

MuddyRangeRover · 06-10-2007, 07:31 AM

thankgs guys. Yes I meant 10 bolts.
By composite gasket you mean the brown material type?

p76rangie · 06-10-2007, 06:46 PM

You only need to replace the bolts if the use once type bolts have been used previously. Rather than replace them with the same bolts, you are a lot better off changing to studs.

roverandom · 06-11-2007, 04:47 PM

New head bolts are cheap insurance, just change them anyway. You can not tell how many times they have been torqued or over torqued before just by looking at them. Head studs have a more even rate of stretch, thus a more even clampload and are alot stonger. Head studs are only realy required on high compression engines (like race engines). Having said that, if it was me I would upgrade to the studs. Not a fantastic price difference and why not make it better than it was since you have the heads off anyway.

p76rangie · 06-12-2007, 03:13 AM

Using studs on Rover motors reduces the risk of blowing a head gasket and rear coolant leak.

06-09-2007, 12:25 PM	#1 (permalink)
MuddyRangeRover Where is my Black Son? Join Date: Oct 2006 Location: Aurora/Toronto, Ontario, Canada Posts: 496 Gallery: 0	head compatability Will heads from a 4L 97 disco1 work on the block of a 1990 RRC 3.9? One has 8 bolts one 12 __________________ 1996 Disco 1 SE7- Stock(Awesome sound system) DD/Range Rover hauler. 1990 RRC SWB Camel Trophy Inspired- ARB, Hella's, Bosch's, AR's 15X8, 32"MTR's,Equipe suspension stuff, Skids, waiting for more...

06-09-2007, 04:26 PM	#3 (permalink)
Paul Grant Senior Member Join Date: Jun 2005 Location: CT Posts: 941 Gallery: 0	You can use the heads off the Disco but make sure you use the composite gasket and you absolutely must get new head bolts. Call Rovers North and they'll set you up with everything you need. __________________ Paul Grant paulgrant@mac.com http://stores.ebay.com/Classic-Rovers 203-770-1699

06-10-2007, 07:31 AM	#4 (permalink)
MuddyRangeRover Where is my Black Son? Join Date: Oct 2006 Location: Aurora/Toronto, Ontario, Canada Posts: 496 Gallery: 0	thankgs guys. Yes I meant 10 bolts. By composite gasket you mean the brown material type? __________________ 1996 Disco 1 SE7- Stock(Awesome sound system) DD/Range Rover hauler. 1990 RRC SWB Camel Trophy Inspired- ARB, Hella's, Bosch's, AR's 15X8, 32"MTR's,Equipe suspension stuff, Skids, waiting for more...

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06-09-2007, 03:45 PM	#2 (permalink)
rqsall Member Join Date: Aug 2006 Posts: 32 Gallery: 0	It will fit as far as I know. But I'm pretty sure the disco has 10 bolts and the range rover 14. You can omit the outer row of bolts without problems, and you should replace the metal gasket with a composite one.

06-10-2007, 06:46 PM	#5 (permalink)
p76rangie Ian Matthews Join Date: Jan 2006 Location: Melbourne Australia Posts: 2,140 Gallery: 0	You only need to replace the bolts if the use once type bolts have been used previously. Rather than replace them with the same bolts, you are a lot better off changing to studs.

06-11-2007, 04:47 PM	#6 (permalink)
roverandom Senior Member Join Date: Apr 2007 Location: Alberta,Canada. Posts: 402 Gallery: 0	New head bolts are cheap insurance, just change them anyway. You can not tell how many times they have been torqued or over torqued before just by looking at them. Head studs have a more even rate of stretch, thus a more even clampload and are alot stonger. Head studs are only realy required on high compression engines (like race engines). Having said that, if it was me I would upgrade to the studs. Not a fantastic price difference and why not make it better than it was since you have the heads off anyway.

06-12-2007, 03:13 AM	#7 (permalink)
p76rangie Ian Matthews Join Date: Jan 2006 Location: Melbourne Australia Posts: 2,140 Gallery: 0	Using studs on Rover motors reduces the risk of blowing a head gasket and rear coolant leak.

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