| Re: [GMCnet] engine block ID info [message #278329 is a reply to message #278325] |
Sun, 24 May 2015 22:03   |
<rallymaster
Messages: 361
Registered: May 2014
Karma:
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Senior Member |
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Does all this mean that the cam from the KOBA 455 engine is a drop-in and
will work in the 403?
ronC
On Sun, 24 May 2015 21:33:59 -0500 Bob Dunahugh
writes
When ever I have to work on my 78 GMC 403. I'm
> going to be looking into installing the 455 cam as I see it now by
> it's profile. I talked to Dick Paterson on this last Thursday. And
> he is thinking the same thing.
===========================================================
On Sun, 24 May 2015 21:33:59 -0500 Bob Dunahugh
writes:
> Mike. From what I found out about 11 years ago. When I went looking
> for a 403 just to have around if I ever needed any parts. The car
> 403 will work in the GMC. I've been looking into the cams that were
> used in the 403, and 455. As covered last week. The Distributor,
> carb, and water pump are different then the car 403. I've always
> been under the impression that the cam was also specific to the GMC.
> So I've been looking into this for both the 403, and 455. It's
> beginning to look like there are 2 cams that may have been used in
> the 455 car engine. That was used in the GMC. It's looking like the
> 1973, 225 HP engine that developed it's peak torque of 360 ft lbs @
> 2600 RPM. Or the other 1973 car 455 cam that was rated at 250 HP,
> with it's peak torque of 375 ft lbs @ 2800 RPM. As for the 403
> cam that came in the the GMC. I believe it's cam came from a 350
> by it's profile. This may have been because of emission standards.
> When ever I have to work on my 78 GMC 403. I'm
> going to be looking into installing the 455 cam as I see it now by
> it's profile. I talked to Dick Paterson on this last Thursday. And
> he is thinking the same thing.
> Bob Dunahugh78 Royale
>
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Ron & Linda Clark
North Plains, ORYGUN
78 Eleganza II
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