Whats a 350 carb engine block worth that needs rebuilt?

[RetroC10Sport]

Too much free time...

 

[davbell22602]

1961-65 were the years the 409 was offered. There was also a truck version and I think it was offered up to 1966. Based on the 348 offered in cars 1958-61 and trucks 1956-61. There was also a 427 built for racing based on the W motor.

Any 1961-65 Impala, Bel-Air or Biscayne could get a 409.

So how you tell if its true 409 or not?

 

[HotRodPC]

Quite a topic shift but guess I'll play. I never learned much about 348 or 409. I knew what they were and what they usually came in. The 409 was usually in SS models and had a 4 speed if it was dual quads, and did NOT use Qjets. As with most common dual quad set ups, Carter AFB Carbs were used. Pontiac also used Carters in both single and dual set ups. 389's had the single, and duals were optional on the 421 and later the 428. Many are not even aware that such a cu in motor existed. 421 and 428 other then the Ford 428. Now here I go with subject change, 389 and 421 were 1 generation, then Pont 400 and 428 were the next generation. All 4 were good motors. But, so there you go, I know more about the Pontiac and Olds Big Blocks than I do the Chevy Big Blocks back then. And I will add, the 348 and 409 are about the ugliest motor I think I ever seen in a GM car.

 

[RetroC10Sport]

Dual quads were never optional on 428s. Pontiacs had tri-power which were used on 389s and 421s, never the 428. Only the Super Dutys (389 & 421) received dual quads and it was optional in 1956, but went to tri-power in 1957.

In 1956, Pontiac used Rochester 4CGs. Later going with the Carter AFB.

 

[Old77]

Ok, I'm going to have to sit down and borrow some of 89Sub's popcorn

 

[RetroC10Sport]

So how you tell if its true 409 or not?

348s had a 4.125 bore and 409s had a 4.3125 bore. Stroke was 3.25 in the 348 and 3.50 in the 409.

409 cranks had heavier counterweights, shorter connecting rods.

348s had offset pistons so left and rights are different.

 

[89Suburban]

Ok, I'm going to have to sit down and borrow some of 89Sub's popcorn

I can't even comprehend all this **** anyway, lol. 89S----> <-----Old77

 

[HotRodPC]

Dual quads were never optional on 428s. Pontiacs had tri-power which were used on 389s and 421s, never the 428. Only the Super Dutys (389 & 421) received dual quads and it was optional in 1956, but went to tri-power in 1957.

In 1956, Pontiac used Rochester 4CGs. Later going with the Carter AFB.

yeah, you're right. I got stuck on Dave's Dual Quads. Wasn't even thinking of the Tri Power, which was Rochesters Carbs x 3. You mention Pontiac used Rochester 4CG's in 56, but never used that in a dual quad set up, single only.
And yes, the Tri Power was by far more common than the dual quad in Pontiacs. Many use the phrase Tri Power to mean 3 dueces, but its actually a Pontiac trademark name.

 

[Old77]

 

[davbell22602]

348s had a 4.125 bore and 409s had a 4.3125 bore. Stroke was 3.25 in the 348 and 3.50 in the 409.

409 cranks had heavier counterweights, shorter connecting rods.

348s had offset pistons so left and rights are different.

So can person bore out 348 to make it 409 copycat?

 

[89Suburban]

 

[Old77]

89Sub....I'm not that kinda dude. You gotta move a little slower.....

 

[89Suburban]

89Sub....I'm not that kinda dude. You gotta move a little slower.....

Fine, where is Retro at......

 

[Old77]

 

[RetroC10Sport]

yeah, you're right. I got stuck on Dave's Dual Quads. Wasn't even thinking of the Tri Power, which was Rochesters Carbs x 3. You mention Pontiac used Rochester 4CG's in 56, but never used that in a dual quad set up, single only.
And yes, the Tri Power was by far more common than the dual quad in Pontiacs. Many use the phrase Tri Power to mean 3 dueces, but its actually a Pontiac trademark name.

Actually, yes they did use two Rochester 4CGs in 1956, same as Cadillac and Packard.

I'm not recalling off the top of my head what Chevy used with their first dual quad set up in 1956, but it may have been Carters.