455 in 78 GMC

LARRYT

New member
Feb 9, 2020
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GMC Fans .Soo here i sit after buying 78 gmc 455 (verified by 2 former owners) waiting to go get it sometime late in march ( sight unseen; oh! oh! April fools day )
OK now ,,how can i tell by looking. to verify such claims
ps it a honor having you all to consult thanks
Larry 455-78
 

Christo

Administrator
Staff member
Oct 4, 2019
112
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18
Weymouth, MA
I saw a thread recently that said the easiest way to tell 455 vs 403 was the number of bolts holding down the valve covers. 403 has fewer. Can someone help me out with the specifics?
 

LARRYT

New member
Feb 9, 2020
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1
by the way just happen to have a photo i can see 3 and there must be 2 more by the spacing . 455 confirmed happy now Larry 78 /455