Toby Posted September 25, 2011 Share Posted September 25, 2011 Hi - I bought a replacement 1300 cylinder head off ebay for my MkIV Spitfire. After fitting it the rocker arms don't line up with the top of the valve stems (see pic) Anyone have any idea what's going on here? Maybe the head isn't a 1300?Thanks in advance Link to comment Share on other sites More sharing options...
Clive Posted September 25, 2011 Share Posted September 25, 2011 Valve tops look like herald ones, so would be 1300.The worrysome bit is the end one, it def can't be repaced by the looks of it.Were they the rockers that came with the head, or off your old one? Link to comment Share on other sites More sharing options...
Toby Posted September 25, 2011 Author Share Posted September 25, 2011 The rockers are from the old head.Are the rockers different on a 1300 Herald do you know? Looking at Rimmers online catalog they appear to be the same part... Link to comment Share on other sites More sharing options...
heraldcoupe Posted September 25, 2011 Share Posted September 25, 2011 The rocker shafts differ between six and eight port head types. If the head fits, so should the rocker shaft. Did the shaft get dismantled and reassembled, or did it go onto the new head exactly as removed?Cheers,Bill. Link to comment Share on other sites More sharing options...
Toby Posted September 25, 2011 Author Share Posted September 25, 2011 The rocker assembly wasn't dismantled - just swapped over.Otherwise the head seems to fit perfectly...The number stamped on the head is 307240 if that helps... Link to comment Share on other sites More sharing options...
That Man Posted September 25, 2011 Share Posted September 25, 2011 Are all the exhaust rockers out of position or just the rear two ? Link to comment Share on other sites More sharing options...
Toby Posted September 25, 2011 Author Share Posted September 25, 2011 It's all the exhaust rockers. Numbers 2 & 3 could probably be solved by swapping the spacer to the other side, but 1 & 4 look like a different pedestal is required. But I can't see any relevant part numbers on canleys or rimmers. Link to comment Share on other sites More sharing options...
That Man Posted September 25, 2011 Share Posted September 25, 2011 I've just had a quick measure of a spare 1300 head in the shed and :-The distance for the centre of the inlet valve to the exhaust valve on the same cylinder is 1 7/16" (36.5mm)The distance between the centres of No.2 cylinder and No. 3 cylinder exhaust valves is 1 7/8" (47.6mm)I only measured with a steel rule, so not exact ;)This is not one i've come across before. But the question is though which is the correct one, the new head or the old one ?Gordon Link to comment Share on other sites More sharing options...
JensH Posted September 25, 2011 Share Posted September 25, 2011 Number & prefix for present engine, old head and new head etc. (stamped)? Link to comment Share on other sites More sharing options...
Toby Posted September 25, 2011 Author Share Posted September 25, 2011 Old head: 312246New head: 307240Engine is DH prefix. Link to comment Share on other sites More sharing options...
mikeyb Posted September 25, 2011 Share Posted September 25, 2011 are the two heads the same height? Link to comment Share on other sites More sharing options...
Toby Posted September 25, 2011 Author Share Posted September 25, 2011 The height isn't noticeably different, although I haven't measured it - what would a height difference indicate? Link to comment Share on other sites More sharing options...
Slimboyfat Posted September 26, 2011 Share Posted September 26, 2011 http://www.canleyclassics.com/searchforapart/?desc=&ptno=307240Used for a very limited period early in 1300 FWD, and 13/60 production, and very rare.It has different valve spacing (shared with 70X head) and as a consequence used 'special' rocker pedestals. Try and get the complete rocker shaft assembly from the guy you purchased the head from. It's not worth ringing around the the usual spares specialists for it. They will either not have a clue what you are after, or they are fully aware of what they are and are guarding any stock for their own use 8).There is a rather involved bodge to get around it if you have the patience, give me a ring if you want to know how. Link to comment Share on other sites More sharing options...
heraldcoupe Posted September 26, 2011 Share Posted September 26, 2011 Every day's a schoolday... :-) Link to comment Share on other sites More sharing options...
plk21e Posted September 26, 2011 Share Posted September 26, 2011 why not resell the special head and use the cash to buy another 1300 head you will most likely make a profit Link to comment Share on other sites More sharing options...
Toby Posted September 26, 2011 Author Share Posted September 26, 2011 Slimboyfat wrote:http://www.canleyclassics.com/searchforapart/?desc=&ptno=307240Used for a very limited period early in 1300 FWD, and 13/60 production, and very rare.It has different valve spacing (shared with 70X head) and as a consequence used 'special' rocker pedestals. Well I never - very interesting! But a pain in the a*** as far as I'm concerned. I use the car as my daily driver and I need it back on the road ASAP.Does anyone have a decent 1300 head they want to swap for this one? I'm in North London... Link to comment Share on other sites More sharing options...
JensH Posted September 26, 2011 Share Posted September 26, 2011 I do have a 307240 head on a GE engine (in my old spit mk 3). Didn't know it was different!Any advantage - except not being able to get a complete new rocker shaft assembly? Link to comment Share on other sites More sharing options...
thescrapman Posted September 26, 2011 Share Posted September 26, 2011 Mr SBFAre you saying the head is very rare and thus sought after (but not necessarily valuable), or is it the rocker assembly that is useful?Or are they only valuable only as a pair.Anyway, TobyI have plenty of spare heads at home, not 100% sure of condition, what are you looking for?Built up and ready to go, or one for cleaning up and fitting new valves to etc?CheersColin Link to comment Share on other sites More sharing options...
Toby Posted September 26, 2011 Author Share Posted September 26, 2011 thescrapman wrote:Built up and ready to go, or one for cleaning up and fitting new valves to etc?I need something that is ready to go - the car is my daily driver and I need to get it back on the road ASAP Link to comment Share on other sites More sharing options...
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