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Re: Big block 400 in 70 GMC Sierra Grande?
Quote:
Originally Posted by 2tons of fun
thats funny, because i just pulled a virgin 396 out of my 70.
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I did some further research and found out through Motors Repair Manual that the 396 was still used in the trucks in 1970, whereas the cars used the 402. The 402 was used in the trucks in 1971 and 1972. The trucks used a 454 starting in 1973.
The 396 had a bore of 4.094" and stroke of 3.76". The 402 had a bore of 4.126" and stroke of 3.76" I hope this helps to eliminate the confusion.
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Charles
68 SWB, Dad bought new, now 396 & factory ac
64 Impala SS, 409 425HP, 4 speed AC
64 Bel Air Wagon, 400 Small Block
57 Bel Air all original 283 w/Factory Air
77 GMC Sprint, 454/425HP
67 Olds 442, all original
90 ZR1 Corvette
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