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Old May 17th, 2018, 07:41 AM
bigblockv6 bigblockv6 is online now
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Default Re: Found a BBGMC v6 401 in TN

Originally Posted by FetchMeAPepsi View Post
I'm sure BBv6 will be in to correct us, but I think they had different water jackets (is that a thing?) too to account for the added heat/pressure. IIRC, and I may not, they weren't just 305s with bigger pistons + heads.
Actually I won't correct you on that because what you stated here is true!:thumbsup
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Old May 17th, 2018, 09:08 AM
BobBray BobBray is offline
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Default Re: Found a BBGMC v6 401 in TN

Wow, and it's a 4X4. Anyway, Western Flyer was the forerunner to today's New Flyer, a major manufacturer of transit coaches based in Canada (Winnipeg, I think). Western Flyer used a lot of International gasoline engines in the 50's, chances are this coach had an IH 'Red Diamond' 450 in-line 6. Considering GMC put a lot of effort into marketing the V-6 as a replacement engine for other makes of trucks and buses, this bus was probably re-powered some time in the late 60's by a GMC dealer. Figuring that a 4X4 bus was probably very rare and very expensive, it's not a surprise someone made an effort to keep it going. I have seen many similar vintage Flxible Clipper's with GMC V-6's in them.
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Old May 18th, 2018, 03:39 AM
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Default Re: Found a BBGMC v6 401 in TN

Fellas, although personally I don't recommend it, my late father said he had seen a 305 block bored to 351 but it also had been cross bolt drilled on the main caps like a toro-flow to stiffen the block. I totally agree to replace the dead 351 with a 401.
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Old May 21st, 2018, 01:08 PM
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Default Re: Found a BBGMC v6 401 in TN

IH made a couple smaller displacement Red Diamond engines, according to Wikipedia, they made 318, 361, 372, 401, 450, & 501. Production started in 1941 and ended in 1974. Only some of the engines were available at any one time. Probably the 450 was made the longest, most popular engine of the line, was able to replace sleeves during a major rebuild with block still in the frame. 501 was parent bore engine, no sleeves. Lots and lots of fleets had R-190's and CO-190's with RD-450's for power.

Anyhow, For sure use the 401 V6 to replace the tired 351. Overall size of the big block V-6's very similar, 401 should fit anywhere a 351 or 305 has been. There's pictures and video here of a 478 in a 3/4 ton pickup. Just imagine what a great tow rig that is!
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Old May 21st, 2018, 06:19 PM
Arubariba Arubariba is offline
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Default Re: Found a BBGMC v6 401 in TN

Originally Posted by bigblockv6 View Post
Looking at the pics of the engine it appears that you have a 351 Magnum V6 which was first introduced in 1966, I would say it's either a 66 or 67 year engine. If you replace it with a 401M hang on to the Magnum heads and manifolds both exhaust and intake.
Thanks, so someone did a great job when they re-powered the bus because it looks like a factory job :-). I am holding on to the heads, carb and pistons (if they are in good shape).
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