i found this on ebay
CLICK HERE. question: is this "bigger" than a standard a12 cam, and if so if it is interchangeable (i imagine it is) with the standard one, and what power increase would it give,

and i realise it is post only to the US

[edit] it says it'l fit, see i dont take much notice, but the other questions are still out there to be answered

just go A15..

The camshaft in the photo is a Datsun 1200 GX cam & it will fit in your "Datsun-1200" car engine. It has a "sportier" cam timing profile than the standard 1200 one.

If you use a Datsun 1200 cylinder head, flat top pistons for more compression, a GX twin carb induction system & a GX exhaust manifold, then you will get standard GX power output, but the cam alone will not do much for an otherwise standard engine.

The standard cam has an advertised duration of 248 degrees while thr GX cam has an advertised duration of 256 degrees.

If you have a non "Datsun-1200" version of the A12, then forget it. This cam will work in a Datsun 1000 engine too.

The seller will ship overseas, & this is clearly writen all over the page, so i don't know where you get the US only idea.

a nother thing, the a10 rockers have a slightly bigger ratio

You can use the GX cam , A14 valves with GX springs a , header and weber 32/36 carb. This will give you 80-85 HP range depending what you do to clean up the head. Standard GX is motor is 83 HP.

Tom

Quote: No they dont, both have a 1.44 to 1 ratio from memory. Where did you get that info?

Rallytwit
Your suggestions are good, but on what base engine are you suggesting that it be done while using this cam, & which cylinder head would be good to use?

Obviously the A12GX bottom end would be best. I currently use a stock A12GX bottom end with the H-production head (flowed) GX springs and A-14 valves with the weber 32/36. The carb has the choke removed and the carb bore smoothed. Keep in mind my car is strictly a racer. I was using a complete GX set up but here in Las Vegas Nevada we have to smog 68 and newer cars. So when I decided to do a Tarmac Rally the car obviously needed to be made street legal. Hence the switch. My lap times have not changed from the near stock GX to the current set-up. I think we are just shy of 90 HP
For a street 1200 we did a buddies car with the standard A12 bottom end , H-production head , A14 valves , B210 Electronic dizzy , header and weber carb. This worked very nicely for a daily driven car with basic shock and sway bar mods. Made a good all arounder.

Tom

PS For SCCA I always had to have the A12 ,the Vintage group doesn't car if the car has an A14 but now after 18 yrs I have a ton of A12 spares.

so it will work in an A15? Noone ever seems to say specifically if it did or not.

It will NOT fit any A engine which has the alternator on the right side, and the dizzy in the middle rather than the front of the block.

Quote:
Yes I did.
I wrote that it would work in your "Datsun-1200" car engine. If i had meant all A series, i would have said so.
I also wrote that "if you have a non "Datsun-1200" version of the A12, then forget it"
This means that if it is included in the list, it will work, if not,... it won't

The engine in the Datsun 1200 has the distributor right up front, over the oil pump, while A series engines from "74 onwards have it located further back, which meant that they needed to add another drive gear on the camshaft to drive it.
Now have a look at the photo again & count how many drive gears are on it.

This is why i never refer to the 1970 to '73 engines as A12's, even though this is stamped as the enginne number prefix. I always refer to them as the Datsun 1200 engines & that way there are no mistakes. The A12 designation, for me, is reserved for the A12 engine from '74 onwards.
No mistakes, no confusion