If you know.......

Managed to save it. Last cylinder head bolt on the quad rebuild. 29Nm on the torque wrench and it went belly-up way before that. I suspect someone has been there before me and overstretched them 🙄 New ones ordered though.
 
Ah, the Hillman Imp - sweet memories............ :coat: God I hated that engine with its head!
Yes, when they were tuned they had a habit of blowing head gaskets if you weren't spot on torqueing the head down right! Mine had the cylinders bored out, High Compression Powermax pistons, Piper high lift cam, twin Webber 40's and a limited slip diff!
As long as you got all of the torque setting right they were quick and reliable! Pulling off the start line my front wheels were rarely on the ground for the first 20 yards or so!
Ah, definitely sweet, sweet memories!:) (Back in the days when I had hair growing on my head rather than just out of my ears and nose;))
 
used to get it on a regular basis back in the seventies with 6mm exhaust manifold studs on various Japanese motorbikes that exhaust manifolds were right behind the front mudguard to pick up all the road muck, it was fun trying to find the centre on those to remove them....
 
Yes, when they were tuned they had a habit of blowing head gaskets if you weren't spot on torqueing the head down right! Mine had the cylinders bored out, High Compression Powermax pistons, Piper high lift cam, twin Webber 40's and a limited slip diff!
As long as you got all of the torque setting right they were quick and reliable! Pulling off the start line my front wheels were rarely on the ground for the first 20 yards or so!
Ah, definitely sweet, sweet memories!:) (Back in the days when I had hair growing on my head rather than just out of my ears and nose;))
Spot on 👍

It was my mother's car so not tuned at all but I can remember taking that inclined engine out so many times my father built a dolly on to which the jacked car would be lowered to wheel the engine out backwards to work on it. Front Kingpins were a sod too and I still have one 50 years on that I use as a drift. I can remember going with my father back into his works (K&L Steel Founders in Letchworth) in the 70s IIRC to get a particularly stuck one out using one of their "small" hydraulic presses. It went at some phenomenal speed when it finally shifted and sounded like a bullet going off. Sweet memories indeed :lol:
 
used to get it on a regular basis back in the seventies with 6mm exhaust manifold studs on various Japanese motorbikes that exhaust manifolds were right behind the front mudguard to pick up all the road muck, it was fun trying to find the centre on those to remove them....
I had that on a Yamaha YZF600R Thundercat that was a **** of a job, Not in the 70's for sure.
 
Or tap it for the next size up... 🤫
Can't really. The bolt size is defined by the bore of the cylinder and head. I was sweating a tad drilling it out. If I'd buggered it I'd have been looking at using a helicoil or something like it
 
Yes, when they were tuned they had a habit of blowing head gaskets if you weren't spot on torqueing the head down right! Mine had the cylinders bored out, High Compression Powermax pistons, Piper high lift cam, twin Webber 40's and a limited slip diff!
As long as you got all of the torque setting right they were quick and reliable! Pulling off the start line my front wheels were rarely on the ground for the first 20 yards or so!
Ah, definitely sweet, sweet memories!:) (Back in the days when I had hair growing on my head rather than just out of my ears and nose;))
I forget how many time I had to replace the sodding head gasket on my Sunbeam imp sport, I ended up using the OHC valve shims direct from the Coventry Climax fire pump factory down the road as they had a bigger spread range than Rootes did to take up the slack as it was originally one of their designs. There was a method of cutting a ring around the cylinder area on the head and using stainless hollow rings I had read of being used for racers. When at Rootes I heard they had used two blocks to make a small experimental V8 unit.
 
Had that happen on a Hilman Imp block that I used to race as a Class 3 (Modified up to 1300cc) Grass Track back in the 70's, ended up drilling it out and re-tapping it!
My brother had his engine hanging on an engine hoist for three days (with a one inch gap between it and a wooden pallet) waiting for the block to detach itself from the cylinder head. AFAIR weren't they BOTH aluminium and so would effectively weld themselves together regardless of the gasket between them? Can't remember much about the car other than it being bronze in colour, on an L registration, and I think, the 1200cc engine? If there was such an engine size?
 
Spot on 👍

It was my mother's car so not tuned at all but I can remember taking that inclined engine out so many times my father built a dolly on to which the jacked car would be lowered to wheel the engine out backwards to work on it. Front Kingpins were a sod too and I still have one 50 years on that I use as a drift. I can remember going with my father back into his works (K&L Steel Founders in Letchworth) in the 70s IIRC to get a particularly stuck one out using one of their "small" hydraulic presses. It went at some phenomenal speed when it finally shifted and sounded like a bullet going off. Sweet memories indeed :lol:
My dad had one. As kids we always used to get the salmon smell that preceded it all going bang
 
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