cam shaft queries

[Stickman]

Just wondering if there is any difference in the std cam shafts between the 3 bearing motor and the 5 bearing??
And is the cam in the 1500 the same as the GT 1600??

[CQGT]

Hi Sticky.
This is 1 of the mods Isuzu had done when they went from 3 brg. mains to 5 brg.
They changed the profile of the cam lobe to get better economy and from 6 brg. to 5.
Isuzu brought out a supplement to the engine manual explaining the difference.
The cams on all the engines are different. ie. 3 & 5 and cc rating. My parts books give me 4
different part numbers.

Dave.

[Asroc66]

Hi Stickman,
Like the Crankshafts, the Cams are not interchangeable between early model 3 bearing and later 5 bearing engines.
Different number of Cam bearings between the 2 camshafts.

Later 5 bearing 1500 and 1600GT OK however

Cheers
J

[PR91]

3 bearing GT and sedan had the same cam.
5 bearing GT had the same profile as the 3 bearing.
5 bearing sedan was a tamer profile for economy.

[Stickman]

Thanks guys
I have a NOS cam I bought a couple of years ago, now I just need to figure out what engine it's for......
I'll get the part number off the box and see if someone can isolate which one for me

[Stickman]

I have a 64/65 parts book and it has 2 numbers for cams 12511 224 (G150) & 12511 223 (G130)

Part number for my cam is 12511 333
Can anyone tell me which engine it's for? (please be GT please be GT please be GT )

[Dick]

Sorry to mention it is a 1300 and 1500 cam ( 1968 - 1975). The GT cam is numbered 12510-058. This cam has a little plug at the gearbox side in it ....
Gr Dick

[PR91]

Yep. 5 bearing sedan cam.
Least "GT" of the lot.

[Stickman]

Thanks Dick and Brett

Well I guess that rules it out for my GT engine then.......

[Asroc66]

Tighe Cams for a re-grind
Tell him the Bellett nut from Tassie sent you
He's reground 3 for me so far.......
You won't look back
Cheers
j