nisskid Posted June 7, 2011 Share Posted June 7, 2011 i have a list of things to do while the head is off, but keen to hear about anyone's experiences of small items which have failed for others, that might be worth replacing/checking/fixing while the head's off. knock sensors is one im unsure of, not sure if they are worth doing. it's an old RB20, 200,000+, seen a tonne of thrashing, a lot of overheating. some of the big obvious stuff which will obviously get done: head gasket water pump timing belt heater hoses ideas on anything else? Link to comment https://www.sau.com.au/forums/topic/367048-things-to-do-on-a-headless-block/ Share on other sites More sharing options...
Adriano Posted June 7, 2011 Share Posted June 7, 2011 Oil restrictors Link to comment https://www.sau.com.au/forums/topic/367048-things-to-do-on-a-headless-block/#findComment-5854404 Share on other sites More sharing options...
STATUS Posted June 7, 2011 Share Posted June 7, 2011 fark with 200 +kms just throw in another motor... average rb20 goes for around 200-400 bucks but if you have the head off check the valve guides and check the valves for mushrooming. replace stem seals but only if the guides are ok or your wasting your time.. Link to comment https://www.sau.com.au/forums/topic/367048-things-to-do-on-a-headless-block/#findComment-5854413 Share on other sites More sharing options...
StevenCJR31 Posted June 7, 2011 Share Posted June 7, 2011 rip out your old core plugs,give the water jackets a good blast with a high pressure cleaner and bung in some new core plugs while you have the motor out Link to comment https://www.sau.com.au/forums/topic/367048-things-to-do-on-a-headless-block/#findComment-5854533 Share on other sites More sharing options...
zebra Posted June 7, 2011 Share Posted June 7, 2011 Double and triple check the head and block faces are dead sflat, if there is any doubt have the head machined flat, if the block isnt level either, rip it out and do what Trent said Link to comment https://www.sau.com.au/forums/topic/367048-things-to-do-on-a-headless-block/#findComment-5854592 Share on other sites More sharing options...
bluey33 Posted June 7, 2011 Share Posted June 7, 2011 New exhaust manifold studs. Link to comment https://www.sau.com.au/forums/topic/367048-things-to-do-on-a-headless-block/#findComment-5854597 Share on other sites More sharing options...
discopotato03 Posted June 7, 2011 Share Posted June 7, 2011 Well if the bottom end is/could be questionable I'd think spending money on its top end is too . You get so much more bog std from an RB25 that if it can be done legally in your state it'd be my no 1 move . A good std one tuned properly , std engine + manifolds that is , should eat a 20 in a road car mainly because into the larger bore they had bigger ports and valves . Other than this a good runner RB20 would be the best bang for buck I think . A . Link to comment https://www.sau.com.au/forums/topic/367048-things-to-do-on-a-headless-block/#findComment-5854677 Share on other sites More sharing options...
battery Posted June 7, 2011 Share Posted June 7, 2011 Im a big fan of the rb20 but when mine blew a HG i hunted around for a new one and basically found i could drop a rb25 for a little bit more... I already had an rb25 box like you so it was an easy choice. Link to comment https://www.sau.com.au/forums/topic/367048-things-to-do-on-a-headless-block/#findComment-5854690 Share on other sites More sharing options...
tridentt150v Posted June 7, 2011 Share Posted June 7, 2011 200,000+, thrashing, a lot of overheating. warp city..........your block and head would need surfacing. but as others have said, why bother, replace it with a 25. Link to comment https://www.sau.com.au/forums/topic/367048-things-to-do-on-a-headless-block/#findComment-5854902 Share on other sites More sharing options...
nisskid Posted June 8, 2011 Author Share Posted June 8, 2011 fark with 200 +kms just throw in another motor... average rb20 goes for around 200-400 bucks but if you have the head off check the valve guides and check the valves for mushrooming. replace stem seals but only if the guides are ok or your wasting your time.. engine is fine, just doing a freshen up as ive just done some work to it to push 250rwkw. head's getting pressure tested, if there's any leaks through the valves they will be checked and seals replaced, if not ill leave them. Link to comment https://www.sau.com.au/forums/topic/367048-things-to-do-on-a-headless-block/#findComment-5855092 Share on other sites More sharing options...
nisskid Posted June 8, 2011 Author Share Posted June 8, 2011 New exhaust manifold studs. thanks mate, already done. Well if the bottom end is/could be questionable I'd think spending money on its top end is too . You get so much more bog std from an RB25 that if it can be done legally in your state it'd be my no 1 move . A good std one tuned properly , std engine + manifolds that is , should eat a 20 in a road car mainly because into the larger bore they had bigger ports and valves . Other than this a good runner RB20 would be the best bang for buck I think . A . dont wanna use a 25 mate, have one sitting a meter away from the car too, doesnt interest me. keep the comments RB20 related, i've been around skylines long enough to know what engine i wanna use lol Link to comment https://www.sau.com.au/forums/topic/367048-things-to-do-on-a-headless-block/#findComment-5855103 Share on other sites More sharing options...
Recommended Posts
Create an account or sign in to comment
You need to be a member in order to leave a comment
Create an account
Sign up for a new account in our community. It's easy!
Register a new accountSign in
Already have an account? Sign in here.
Sign In Now