377

[rocketracer380]

Sbc 377 with 906 vortecs any thoughts?

[6.50camaro]

Which 377 version are you talking . 4.00" bore x 3.75" stroke =376.99 or 4.155" bore x 3.48" = 377.48 .Dan

[jeff swisher]

I say do it.
I ran a set on a 350 and I ported them and ran a Jegs dual plane intake that was 135 bucks.
Tossed in a 228 @ .050 .492" cam on a 110 lsa and it would twist to 7000 rpm super quick.

I was bummed that my tunnel-ram would not fit it though.

I am in the same situation now with wanting a good flowing head for a 383 i am building.
I do not want to spend money on aftermarket heads I have some Vortecs and some 305 heads.

I will port the 305 heads and run those because my tunnel-ram will fit.
$1000+ and I can have aftermarket heads and make between 40-80 hp more.
But 1K for 80 hp..I will sacrifice some power and if I feel I need an 80 HP boost I will get nitrous.

[mag2555]

Thoughts, yes, Like do you post up so little details with your questions?

[1980RS]

Sbc 377 with 906 vortecs any thoughts?

I would say the heads are too small, but after running in the high 10's with the Vortec's on my 406 I bet they work alright. The down side is the RPM will be limited as the Vortec's are usually done by 6500 rpm making power just where a good 377 will start to shine.

[mag2555]

Thoughts, yes, Like why do you post up so little details with your questions?

[F-BIRD'88]

I say do it.
I ran a set on a 350 and I ported them and ran a Jegs dual plane intake that was 135 bucks.
Tossed in a 228 @ .050 .492" cam on a 110 lsa and it would twist to 7000 rpm super quick.

I was bummed that my tunnel-ram would not fit it though.

I am in the same situation now with wanting a good flowing head for a 383 i am building.
I do not want to spend money on aftermarket heads I have some Vortecs and some 305 heads.

I will port the 305 heads and run those because my tunnel-ram will fit.
$1000+ and I can have aftermarket heads and make between 40-80 hp more.
But 1K for 80 hp..I will sacrifice some power and if I feel I need an 80 HP boost I will get nitrous.

As a alternative to a Tunnel Ram on vortec heads you could consider usibg a dual 4bbl carb adapter on say a good single plane or dual plane hirise manifold to get that big top end charge with 2x4 carbs.
(A Tri-Power 3x2 carb adapter is also a thought for this)
While not quite a tunnel Ram, the multi carbs 2x4, 3x2 or... should make more power up high than just a single 4 bbl carb on these existing vortec manifolds.

The Weiand Stealth Ram EFI (vortec version) lower manifold does fit vortec heads . And the legacy weiand HI-RAM 2x4 plenum top bolts on the Stealth Ram vortec lower.
There is a Speedmaster79 version of the stealth Ram lower EFI manifold .It is universal dual bot pattern able as cast. (drill as required)

The "street size" (cross section area) high velocity long intake runners should work nicely on vortec heads

Don't know why Edelbrock never offered a modern Vortec/E-Tec head version of the legacy Eddy Street Tunnel Ram manifold.
They could just update the existing tooling to allow universal fit dual bolt pattern bolt on fit with either heads.

[1980RS]

I have 2 of those Eddy Air Gap dual quad setup's for Vortec heads. While they run nice on the street they were not great performers, most likely the Eddy carbs were the problem.

[F-BIRD'88]

I have 2 of those Eddy Air Gap dual quad setup's for Vortec heads. While they run nice on the street they were not great performers, most likely the Eddy carbs were the problem.

Joe Sherman used to get very good results with these hi rise RPM Dual Quad intakes. But he never used the recomended small carbs.. He used the larger 750 cfm carbs and employed carb spacers as tall as required.
He reworked the carbs and dialed in on his engine dyno.

If you prefer holley carbs nothing stopping you from fabing up a 2x4 holley carbs to eddy carb flange adapter.
There is also the Holley-Demon Street Demon 625 and 750 carbs with the GoogleValve secondaries you can choose on your Dual Quad induction project.
I believe these Street Demon carbs are a bolt on.
(use 2x750's for high output)

I'd consider the eddy 800 AVS2 carbs for high output 2x4. The secondaries are adjustable.
The carb spacers really kick up the top end.

Small cfm carbs limit top end power on dual quad induction systems. This system wants to eat.

[F-BIRD'88]

I have 2 of those Eddy Air Gap dual quad setup's for Vortec heads. While they run nice on the street they were not great performers, most likely the Eddy carbs were the problem.

Do you want to part with one of them?
Just want the intake,. no carbs.
I do my own carbs.

[n2omike]

Back before today's modern heads, the 'de-stroker' 377 was a killer combination!
Back in the day, we didn't have the heads to support a lot of rpm with 400+ ci. A 400 block with a 350 crank gave better breathing, along with a small enough displacement to still rpm well.

Now that huge/killer heads are available, de-strokers have fallen out of favor, but back in the day all engines were cylinder head limited... so de-stroking allowed them to rev and often make more peak power than their larger counterparts. A well built 377 SBC was something that garnered respect.

[rocketracer380]

Large bore 350 stroke

[1980RS]

I have 2 of those Eddy Air Gap dual quad setup's for Vortec heads. While they run nice on the street they were not great performers, most likely the Eddy carbs were the problem.

Do you want to part with one of them?
Just want the intake,. no carbs.
I do my own carbs.

I would if some where I live buys the carbs and stuff. I know Eddy stopped making that intake now for Vortec heads.

[F-BIRD'88]

I have 2 of those Eddy Air Gap dual quad setup's for Vortec heads. While they run nice on the street they were not great performers, most likely the Eddy carbs were the problem.

Do you want to part with one of them?
Just want the intake,. no carbs.
I do my own carbs.

I would if some where I live buys the carbs and stuff. I know Eddy stopped making that intake now for Vortec heads.

No panic. I am not in a rush.

[1980RS]

Do you want to part with one of them?
Just want the intake,. no carbs.
I do my own carbs.

I would if some where I live buys the carbs and stuff. I know Eddy stopped making that intake now for Vortec heads.

No panic. I am not in a rush.

Sounds good, I will let you know if anything happens.