September 13th, 2022, 02:46 PM
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Member
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Join Date: Jun 2014
Location: Pollock, Louisiana
Truck: 1961 GMC 4000 (Fontaine flatbed) w/ 305B engine
Posts: 53
Rep Power: 76
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Re: Difference in V6 blocks
Quote:
Originally Posted by Prowbar
305, 351 and 379 all use the timing chain. 401, 432 and 478 do not as they use a gear style camshaft drive. This means there is a difference in the main oil galley to supply oil to the middle idler gear. However, a 478 or 401 is easily modified to take a timing chain.
Also my 478 has extra oil drains for accessories and governor oil connections. Bellhousing bolt patterns are the same as are the front cover bolt patterns and motor mount connections. Main and rod bearings throughout the range are the same except for the 73-74 478 which have larger mains. Pete Chronis told me this.
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This is good information. So, I can take a 305 block and bore it to a 351 or a 379 and all I would need to change is the pistons?
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USMC Retired
Pollock, LA.
Own a 1961 GMC 4000 (Fontaine Flatbed) with a 305B engine
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