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Forum: 69-71 Judges only TECH 03-27-2019, 05:03 PM
Replies: 30
Views: 12,594
Posted By Joe's Garage
We've had a couple 1969 'WT' engines and four or five 1970 'WT" engines.

Every one of them had 2-bolt main caps.

And ALL of the 1970s were drilled for 4-bolt mains, but had 2-bolt caps. The 1969s did not have the extra holes drilled.

But you never know what Pontiac...
Forum: 69-71 Judges only TECH 03-10-2019, 03:35 PM
Replies: 30
Views: 12,594
Posted By Joe's Garage
You may find that it is a Service Replacement block

All of the Service Replacement (SR) 400cid blocks we've handled had 4-bolt mains, although I believe they were produced both ways.

I think Pontiac figured that if you managed to break a 2-bolt...
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