Which heads?

[Stomis]

You're now trying to preach to the wrong guy. I do this for a living. From 58cc to 76cc is a 2 point jump in CR. There is no 350's that come with 64cc heads. The later TBI heads are somthing like 67cc's but the pistons are also a dished piston which keeps the CR down around 9:1.

Eh vortecs are 64cc. Atleas the 906 casting (think thats the number).

Theres plenty of people running 416 heads on 350s. Like I said check thirdgen.org. I'm not saying its the ultimate setup but just becauses its unconventional doesnt make it irrational.

 

[4X4HIGH]

Ok, i stand corrected on the Vortec chamber volume, it is 64cc's. Keep in mind though that the Vortec uses a dished piston which keeps CR right at 9:1 CR. You take a 350 chevy with factory 76cc heads and swap a 305 head on and you have 11:1 CR. Unless you run a cam with lots of overlap to reduce low end cylinder pressure it WILL ping on you. Also keep in mind that a cam with enough overlap to eliminate pinging isn't the proper cam to run for a low end torque engine or even a close match for a 305 head.

 

[GsxrMike]

Can you put 350 heads on a 305? If so, whats the advantage /disadvantage?

From what I understand the pros would be better air flow for a high rev engine but the cons are you lose velocity/low end torque and you would lose ALOT of compression ratio unless you ran dome pistons. Does this sound right experts? I've never been much of an engine guy.

 

[Stomis]

Ok, i stand corrected on the Vortec chamber volume, it is 64cc's. Keep in mind though that the Vortec uses a dished piston which keeps CR right at 9:1 CR. You take a 350 chevy with factory 76cc heads and swap a 305 head on and you have 11:1 CR. Unless you run a cam with lots of overlap to reduce low end cylinder pressure it WILL ping on you. Also keep in mind that a cam with enough overlap to eliminate pinging isn't the proper cam to run for a low end torque engine or even a close match for a 305 head.

Yeah plus the vortecs have lots of turbulance IE big reduction in possible pinging and detonation. I'm not arguing that you definately need pistons to match but 416s can be made into good flowing heads that with the rest match correctly can work well on a 350.

 

[pauly383]

But all the work to make it right only applies to someone working their way through school and still owe the buy here pay here lot for their Iroc and can't afford to just drop six bills for a decent set of Vortecs

Voodoo and Vortec seems to be the hot ticket for a carbed 350 nowadays . And I am pretty sure Lunati makes an injection motor cam or two for those heads in a 350