Author Topic: Tracking down original W72  (Read 1197 times)

Maxthe222

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Tracking down original W72
« on: July 07, 2017, 11:53:53 PM »
Howdy folks,

Anyone have any good methods of tracking down a W72 engine? I know the car was bought in Canada, I've got the VIN, PHS documents but that's about it. I'v heard about something in Canada that you can use to get a list of all previous owners, but I think the car only has one previous owner.

Also, how do i tell the difference between a L78 400 Pontiac and the W72? I've tried reading into it, but what I've learnt is it's something to do with chromed heads and here is a certain number stamped on the body somewhere like "XA". If I do end up stumbling across an engine that could be from the T/A i'm looking at, i'd like to make sure I know how to tell if it is from the original car.

Thanks in advance for all the help!

aussieta

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Re: Tracking down original W72
« Reply #1 on: July 08, 2017, 12:27:52 AM »
if it is from the original car it will have the engine number which will match the vin number
for general W72 info this article will help
http://www.78ta.com/Pages/w72.htm
1978 Y84 W72 WS6
A Camaro looks like it could kick your ass.
A Trans Am looks like it's coming over to do it

72blackbird

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Re: Tracking down original W72
« Reply #2 on: November 27, 2018, 04:07:24 PM »
77 W72s used a no.500557 block, 78 W72s used a no.481988 block- both used 6x-4 heads. The stronger 481988 casting was brought back because of TAs coming back
due to engine problems (cracked main saddles). L78s used a 500557 block and 6x-8s. Not sure if the 77 W72 blocks had the 'XX' raised letters in the lifter valley and back of the block, but I know the no. 481988 blocks used in 78-79 did.

Geno
1977 SE T/A (sold :( )
1974 455 T/A (sold :( )
1972 Esprit restomod
1976 T/A restomod
1975 Formula 400 4-speed donor car
1978 Martinique blue W72 4-speed T/A, hurst tops

oldskool

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Re: Tracking down original W72
« Reply #3 on: November 28, 2018, 07:48:33 AM »
Yeah, like Geno said, a '78-'79 W72 will have an XX 481988 block.

There was only one 400 block used in '79. It had a PWH code & came only with a manual trans.

In '78, manual trans W72 blocks had a WC code, and auto trans W72 blocks had an X7 code.

In '77, man trans were WA, auto trans were Y6, and were casting number 500557.

http://www.wallaceracing.com/enginesearch4.htm

The last 6 numbers of the VIN of the car the block came in will also be the last 6 numbers stamped(sometimes very lightly & hard to read) vertically, down beside the timing cover, on the passenger side, near the bottom.

http://www.teufert.net/identify/identify.htm

https://www.hagerty.com/articles-videos/articles/2017/11/27/identify-pontiac-engine-blocks



« Last Edit: November 28, 2018, 07:58:02 AM by oldskool »

Maxthe222

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Re: Tracking down original W72
« Reply #4 on: December 12, 2018, 04:08:27 PM »
Oh as a follow up to this saga, I found the original block for the car in a previous owner's backyard in Ontario, but didn't end up getting the car. Real shame, it was a super well optioned '77 SE (Literally everything but A/C, D58, Y96, CB Radio you name it), and it would have been a steal for the price. The guy who had the engine basically said if you have someone who can get the engine out of the yard, it's yours. Don't know where the car is now, it'd be interesting to see if the seller still has the car in his yard. The block was the cheapo cast block and I think it faulted which was why it was still sitting in the backyard.

Re: Tracking down original W72
« Reply #4 on: December 12, 2018, 04:08:27 PM »

Aus78Formula

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Re: Tracking down original W72
« Reply #5 on: December 12, 2018, 05:48:15 PM »
Engines tend to get pulled for some reason. Except to replace with a SBC. That reason has never become clear, one of lifes great mysteries.

Re: Tracking down original W72
« Reply #5 on: December 12, 2018, 05:48:15 PM »
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