1967 GMC V6 305 cu in...

['68OrangeSunshine]

Originally Posted by Loose Screw

Yeah, I know, I just remember many years ago on another forum about the discussion with the young man counter clerk arguing with the old guy when the clerk asked "make, model, motor" and the clerk told the guy "you mean 350"....

For that numerological reason, the L6 Community calls a 292 [RPO L25] Block bored out to .060-over, a ''301,'' not a 300.
[A 292 at .030-over is 296 CuIn.]
The Ford L6 300 is a reverse-engineered 292 copy. [Or is it I-6 in Fordish? IDK. Don't speak it.]
They came out with it in 1965. The L25 292 came out in 1963. Enough time to buy one, take it apart, and copy it. The 300 Ford has its Carb, intake and exhaust on the Passenger side, and the distributor on the driver side. Pure ''reverse'' engineering.

[factorystock]

Originally Posted by '68OrangeSunshine

The Ford L6 300 is a reverse-engineered 292 copy. [Or is it I-6 in Fordish? IDK. Don't speak it.]
They came out with it in 1965. The L25 292 came out in 1963. Enough time to buy one, take it apart, and copy it. The 300 Ford has its Carb, intake and exhaust on the Passenger side, and the distributor on the driver side. Pure ''reverse'' engineering.

Correct. The thing about the 300, it was a much more popular engine than the 292. The smaller Ford 240 was discontinued in '74, making the 300 the only straight 6 in the line up. Chevy kept both the 250 and 292, not many 292 are out there, most 1/2 tons had the 250's and 3/4 tons usually came with V8's.

['68OrangeSunshine]

Originally Posted by factorystock

Correct. The thing about the 300, it was a much more popular engine than the 292. The smaller Ford 240 was discontinued in '74, making the 300 the only straight 6 in the line up. Chevy kept both the 250 and 292, not many 292 are out there, most 1/2 tons had the 250's and 3/4 tons usually came with V8's.

I have three 292s. One came with my '68 C/10 Stepside -- ordered by the original buyer. [Probably CalTrans or the SP -- Orange fleet truck]. I rebuilt another junkyard block at MCAS Yuma in 1977. [Building an engine was away of relieving boredom in a small hot town in the summer.] That L6 block ran til 2002. 250,000 miles. I rebuilt the OE block in 2005. That's on duty now.
Along the way I picked up another MY '63 292 core from Warrens69GMC who was working at a Checker Auto in Tucson.
When these trucks were the current product, GM dealers pushed V8s and Automatic transmissions hard. I have never seen a Blazer or Jimmy with a Factory L25 292.
I think the fact that the L25 requires a special diagonal crossmember in the 4X4s was one stumbling block. One parts counter guy at the Chevy dealer's said ''the 292 was Chevy's best kept secret.''
It's a very strong engine, with surplus torque that weighs 100 lbs less than an SBC. My 292 with modifications and aftermarket equipment outperforms the 350 crate motor in my '71 Jimmy.