what is this head??

[greg1.4]

hi, more questions about heads..

i got this with a nova rally car i bought, engine was in a box though..

there is some differences in the head compared to a 1300 sr..i have pics to compare..

ok, the heads.."unknown modified" head closest, 1300 sr head to the back of pic..

http://i549.photobucket.com/albums/ii398/Vauxuki/P1140175.jpg

the unkown head has either been skimmed or is smaller than a 1300 sr head as it is 2mm smaller, that is from bottom of head (where goes onto block) and to the top (where the cambox goes on)

then the next biggest difference is the valves..

the springs on the modified head look bigger and they look to be anodies purple at some point..

http://i549.photobucket.com/albums/ii398/Vauxuki/P1140180.jpg

1300 sr -

http://i549.photobucket.com/albums/ii398/Vauxuki/P1140181.jpg

bottom of valves-

the modified head has flat bottoms where as the 1300 sr has small holes/dents in the middle..

http://i549.photobucket.com/albums/ii398/Vauxuki/P1140182.jpg

1300 sr-

http://i549.photobucket.com/albums/ii398/Vauxuki/P1140183.jpg

tops of valves are also different-

unknown/modified head-

http://i549.photobucket.com/albums/ii398/Vauxuki/P1140176.jpg

1300 sr head-

http://i549.photobucket.com/albums/ii398/Vauxuki/P1140177.jpg

outlet pipe on thermostat housing is smaller on the unknown/modified head -

http://i549.photobucket.com/albums/ii398/Vauxuki/P1140179.jpg

1300 sr -

http://i549.photobucket.com/albums/ii398/Vauxuki/P1140178.jpg

inlet ports look as they have been polished -

http://i549.photobucket.com/albums/ii398/Vauxuki/P1140185.jpg

1300 sr-

http://i549.photobucket.com/albums/ii398/Vauxuki/P1140184.jpg

also another thing is the unknown/modified head does not have a number to tell engine sizie on it (top right of head)..

all my other engines/heads have either 1.2/1.3/1.4???

some numbers on the modified head that might help..

http://i549.photobucket.com/albums/ii398/Vauxuki/P1140186.jpg
http://i549.photobucket.com/albums/ii398/Vauxuki/P1140187.jpg

[greg1.4]

are these pistons standard also??

http://i549.photobucket.com/albums/ii398/Vauxuki/P1140188.jpg
http://i549.photobucket.com/albums/ii398/Vauxuki/P1140189.jpg

any help will be appreciated, hope you can understand it..lol

cheers

Greg

[chimp007_uk]

they're usually stamped on the head 16 for 1.6 etc just above no. 4 exhaust port

[garyc]

Thats a 1300 head the one that ends up in 546. It could be from a MK1 astra there should be a year stamp on it. Take another picture so I can see as much of the back of the valve as possible.

[bmw156]

just had a look on my 1.2 and that r90 number is different, but to the right of that number out of shot is a massive number mine is 12 for 1.2

might help

edit, just checked the top pic and theres no number hmmm

[mowgli]

I am guessing that the 'mystery' head is simply a ported & skimmed 1300 early head. the early engines had the smaller thermostat pipe. the pistons look std. it was probably used in club motorsport ie. the astra/nova challenge, as a head skim like that would not be allowed in group A for example. the springs most likely came in a cam kit.

[Stuart]

jesus thats been skimmed a lot!!!!!! best CC the head and work out the CR

[garyc]

CR will be fine Stuart. Autograss cars run at 94mm (ie 2mm off). They were skimmed even more before a rule change last year :-)

[_JH_]

has it got waisted valves too?

http://i549.photobucket.com/albums/ii398/Vauxuki/P1140185.jpg

[garyc]

looks like it! I wonder what the diameter of the valve heads are?

[greg1.4]

what does waisted valves mean?

what else do you want me to get pictures of?

[garyc]

waisted stem is where the stem that meets the head is narrower than what runs in the guide. Pop one out and have a look.

Picture down the inlet port so you can see as much as the valve as possible.

[greg1.4]

are waisted valves good? are they competition/ aftermarket items?

the bottom of the valves seem to be the same size...

will it be a good head to use with a 1400 block, 40's and cam etc

[garyc]

yes they mean more airflow. They are race items. Pop the valve out and see if its had the valve seats done too.

[greg1.4]

will get the valves out tomorrow night and post up pics/measurements..

just been out and measuered the top of the valve (where thrust pad sits in) and it is 29mm..

the bottom of the valve's are exactly the same size as the 1300 sr items..

also got more pics of down inside the inlet port..

will try get pics on in 2 mins..

[greg1.4]

more pics -

http://i549.photobucket.com/albums/ii398/Vauxuki/P1140208.jpg
http://i549.photobucket.com/albums/ii398/Vauxuki/P1140207.jpg
http://i549.photobucket.com/albums/ii398/Vauxuki/P1140203.jpg
http://i549.photobucket.com/albums/ii398/Vauxuki/P1140202.jpg
http://i549.photobucket.com/albums/ii398/Vauxuki/P1140206.jpg
http://i549.photobucket.com/albums/ii398/Vauxuki/P1140205.jpg

now, i will get valves out tomorrow, could you tell me what to look for and what to measure and get pics of to find out what valves i have ect??

i dont really know what i am looking for with the valves..

may thanks for the help, its great!

[garyc]

that is a normal 1300 head, it looks like it has just been cleaned up rather than had extensive porting (cant tell for sure). On the inlet side (iirc on the left hand side) the year or casting will be stamped on there in a round box.

[greg1.4]

got valves out tonight..

more pics -

http://i549.photobucket.com/albums/ii398/Vauxuki/P1150211.jpg
http://i549.photobucket.com/albums/ii398/Vauxuki/P1150212.jpg
http://i549.photobucket.com/albums/ii398/Vauxuki/P1150213.jpg
http://i549.photobucket.com/albums/ii398/Vauxuki/P1150214.jpg
http://i549.photobucket.com/albums/ii398/Vauxuki/P1150215.jpg

this is me holding next to a standard 1300 sr valve to compare..

http://i549.photobucket.com/albums/ii398/Vauxuki/P1150218.jpg
http://i549.photobucket.com/albums/ii398/Vauxuki/P1150219.jpg
http://i549.photobucket.com/albums/ii398/Vauxuki/P1150220.jpg

this is the only markings on the head on inlet side..

http://i549.photobucket.com/albums/ii398/Vauxuki/P1150216.jpg
http://i549.photobucket.com/albums/ii398/Vauxuki/P1150217.jpg

[John]

So are they just simply machined 1.3 valves?

[greg1.4]

i dont really know tbh..

they are certainly different..

the seats are different, valves are thicker..also the top part where the thrust pad sits is different..springs are also smaller and stronger..

does anybody know what valves these are?

[garyc]

Nice, I'd clean the valves up and put it back together and use it if I were you. The are wasted stem valves and probably cost a fortune!

[John]

Gary, so the valves are one offs? standard valves can't be machined down?

[garyc]

may be not one offs but from a specialist supplier. The valve head is flatter than the std one. Do you need some?

[John]

(sorry for the thread hi-jack btw)

Hi gary, nope not after some, i'm just curious! A lad i know is building a 1400 stock rod. just kinda takin notes for him, although i don't think he can run these.

[garyc]

no they would have to be std on there. I presusume its getting the cam, solid lifters and car right on them. they rev to 8.5K or a tad more!

[greg1.4]

gary one of the valves on the head are actually cracked..

do you know where i can get them?

wee 1400, with this head, 40's, cam and ashley 4 branch and full system should go well when built up..

what kind of power do you think i will be looking at?

[MC]

The valves were probably just picked from a catalogue because they are the size required, either standard or 1 or 2 mm larger. It's easy to waste the stems on a laithe, bread and butter for a good quality head job, but it is rare to see wasted exhaust valves. The only down side is that it creates a weakness if the engine is over revved. If you need a replacement, take some accurate measurements and go to a good engine machine shop and order them from the book. Then just get them wasted to match.

[greg1.4]

exhaust valves look wasted also..

with these valves will the be better than standard?

i will take a valve into my local engineering place..T J McKean in Dumfries..

he has built thousands of engines..including 250 + bhp xe's!!