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Hi triumph Stag owner with a 3.5 rover engine
Posted: Sun Sep 08, 2019 8:19 am
by Tonystag
Hi everyone I’ve just got this stag with a 3.5 rover engine fitted with a Holley carb,it’s been off the road since 1996 I have had it running but the clutch is stuck so I am going to have to take out the engine to free it but while it out I was thinking off putting a 3.9 back in ,what I want to know is are the engines the same meaning will it go straight in and will my Holley carb still fit thanks for any advice Tony
Re: Hi triumph Stag owner with a 3.5 rover engine
Posted: Sun Sep 08, 2019 10:26 am
by Rossco
Greetings and welcome to the forum.
The answers to your questions are yes and yes.
Before looking for a 3.9 there are a few cheap upgrades that will put your 3.5 into 3.9 territory in terms of power.
I'm sure one of the members will be more than happy to advise.
Rossco
Re: Hi triumph Stag owner with a 3.5 rover engine
Posted: Sun Sep 08, 2019 12:55 pm
by DaveEFI
Is the rest of the drive train up to handling the extra torque of a 3.9? Mate had a Stag where the diff blew up with the standard engine.
In other words, might be better to increase the BHP of the 3.5 if you want more grunt - and in keeping with the sporty(ish) nature of the Stag.
BTW, few aftermarket carbs are 100% perfect tune wise. And changing the engine size will require it done again, to some extent.