Hey fellas, just got a quick question about my setup.

I have recently removed the old A12 engine from my 1200 ute, and replaced with an A15 engine.

The head is an oval port (GX i was told).
Twin side draught Dellorto DHLA 45's.
4 into 2 into 1 Extractors.

Only mod done is I have ported the head to suit the manifold as they were a larger oval, gave the head a light grind to blend the flow instead of a steep lip.

The problem is that it is running extremely rich. The carbies, head and extractors come off another engine that i do not know the details of. possibly hi comp, cam etc.

Does anybody know the size of the jets i need, and where i can get them?

Any help would be appreciated. Cheers

45s are for a flat-out race engine. It is supposed to run rich. I suppose you can lean them out. Maybe someone here has done this before and can advise further.

Carby setup shoud be somewhere near:

Choke - 37
Main Jet - 140
Emulsion Tubes - 7772.8 or 7772.7
Air Correctors - 180
Idle Jets - 40/7850.2
Accel Pump Jets - 30 or 35
Aux Venturis - 7848.3


Hope that helps

yeah 45's are to big the smallest practical choke size for 45's is 34mm. 34mm at 1 choke per cylinder will be good for about 400cc per cylinder.
you only have 372cc per cylinder i wood suggest 31mm chokes or 32's as the max
so 1's thing to do is to sell the the 45's and by 2 x 40's dellortos and get 31mm chokes wen it comes to chokes for street car 1 size to small is better than 1 size to big.
BUT needle valve ' float level ' main jet 'emulsion tubes ' air corrector jet ' accelerator pump jet ' idle jet & venturis must all be the right size.
then you will love these cabs do all of this in is worth it.
in my opinon without a cam the cabs will not make a lot of difference something like a wade 240 grind is good for street and springs must go now.

i have 2 pairs of dhla 40's one pair stripped the other complete they also have 32mm choke pm me if your intrested

Yeh thanks heaps for your help fellas, I'll chase up some prices for the jetting, and maybe a cam and hi comp pistons, also look into getting some 40's for the time being.

cheers!