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Old 07-09-2008, 10:32 PM
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1971 c 6500 grain truck engine

A guys has a truck engine for sale out of a 71 gmc c 6500. Runs perfect and wants 500 bucks. He says its a 454 and the valve covers say invader on them. If it is a 454 or 427 is this engine any good, will probably be adding performance parts later. I'll be going back tommorrow after work to get casting numbers but is there any other way to tell what it is. Thanks, Jake
It also has a carter four barrel on it

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Last edited by jake_arcticcat; 07-09-2008 at 10:38 PM.
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Old 07-09-2008, 11:28 PM
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"Invader" was a name used on engines starting with the 307 all the way up to the 454. Hard to say exactally what the internals are and if it's the original engine or a transplant. Numbers will help and also head numbers too.


Mark
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Old 07-10-2008, 06:07 AM
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It is a probably a tall deck truck block. Which is a really nice strong platform for a performance build.

These engines were used in Medium duty trucks and buses.

I got one from a dump truck with 4 bolt mains and a forged crank (this was common)

The only problem you will have is finding an intake that matches your RPM range. (most tall deck intakes are single plane with a range of 3000-8000 rpm)

The pistons have an extra piston ring and .400 taller pistons to prevent compression loss and oil burning while idling a long time.

This means that you can use a standard pistons and a .400 longer rod to achieve a better rod/stroke ratio.

Be prepared to throw the heads away, most of these have very small valves. And with the availability of 781, 063, and 049 heads out there it is a better idea to just rebuild a set of those.

Just make sure it is not a 366. Which is pretty much worthless for a performance application.
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Old 07-10-2008, 06:09 AM
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theres lots of tall deck 427 & 454s in grain trucks, witch I would avoid. but lots of original BBC & SBCs in grain trucks had factory GM steel cranks. yrs ago trucks and school buss's is what we looked for to snag builder engines. buss's have mostly dried up. but I still see C50 C60 and C70 grain trucks on auctions ect.
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Old 07-10-2008, 11:08 AM
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If it is a tall deck you will see about 5/16" above the water pump where it bolts to the block. If it is not a tall deck the pump is almost even with the deck where the head gasket is.But only the numbers will tell if it is a 366 or 427 or 454.
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Old 07-10-2008, 11:41 AM
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I'll be goin out there today and get the head and block numbers the one thing that confuses me is why it has just a normal carter on it and not a governed holley?
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Old 07-10-2008, 04:48 PM
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As far as the carb goes, someone probably dumped the Holley years ago and just tossed on the Carter. The governed Holley's were a real joke. Back in the '70's, I had a customer that pulled mobile homes with an old beater IH. Hated that carb!
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Old 07-10-2008, 10:50 PM
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Well went out there and checked it out once more and its just an old 366 so i guess it was too good to be true
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Old 07-10-2008, 10:59 PM
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Everyone talks about the 454 truck block. I have never seen one, heard of one, or seen any proof that it exists... .just the 366 and 427.

They put 454 standard deck blocks in light trucks up through 1-ton, but I have never seen a 454T

By the way... I didn't know this - the 366 was used much later than I thought. I found one in a 2001 step van the other day. Clearly a big block, clearly a T block, and it had a 6.0L on the emissions sticker. TBI, too.
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