Roller cam suggestions for a 4x4 383

[crm318]

I am currently building a vortec 383 for a 79 4x4 blazer. I am using an 880 vortec block that has been decked and bored .030 over. I am going with an eagle balanced rotating assembly with 18cc dish because I want the compression around 9.5 so I can run 87 octane. I am using a set of 062 vortec heads that have been ported and polished only on the exhaust side and has a new valve job, back cut valves and provisions for .550 lift. Is there a roller cam that anyone may suggest that would work well in this set up? I was looking at the ramjet cam, but it looks a bit small, however, a lot of the comp 4x4 cams look really big. What do yall think?

[Captainfab]

I know what you mean by the RamJet cam looks small, but GM also uses that same cam in the HT383 crate engine. I think a set of 1.6 rockers as they used in the RamJet 350 might help it's performance in a 383. That cam can be had for quite reasonable too. In a 4x4 you don't want too big of a cam as it will move your torque band higher up in the rpm range.

As a reference, years ago we built a SB400 for my son using Vortec heads and a Comp XE4262 cam (flat tappet). I was quite impressed with how much power that engine had with a relatively small cam.

https://www.summitracing.com/parts/c...39-3/overview/

[crm318]

I should have mentioned, I also have a set of comp 1.6 ratio roller tip rockers on hand.

[scottofksu]

This is what I went this for my 383 build, but mine has more compression, and aluminum heads - it’s also going in a 4X2 street truck:

https://www.summitracing.com/parts/LUN-20120121LK

Not knowing a ton about your build, I’d check this out:

http://www.lunatipower.com/Product.aspx?id=4578&gid=289
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[Captainfab]

I think if you used them with the 14097395 cam, you would have a 383 with excellent low to mid range power. If those are not self aligning rockers, you will need to install guide plates on the Vortec heads.

https://www.summitracing.com/parts/nal-14097395

That cam used to be a lot less $$ before it got popular. It is still a decent deal.

Originally Posted by crm318

I should have mentioned, I also have a set of comp 1.6 ratio roller tip rockers on hand.

That cam has a bit too much duration for use in a 4x4

Originally Posted by scottofksu

This is what I went this for my 383 build, but mine has more compression, and aluminum heads - it’s also going in a 4X2 street truck:

https://www.summitracing.com/parts/LUN-20120121LK

Not knowing a ton about your build, I’d check this out:

http://www.lunatipower.com/Product.aspx?id=4578&gid=289
Posted via Mobile Device

[crm318]

Thank yall for the input. The 1.6 rockers I have are self aligning.

[Bigdav160]

This is the cam I am using in my Suburban. I am using an 880 block with flat tops and aluminum heads topped with a Stealth Ram manifold.

comp cam 268XFI. Idles with 15-16 inches of vacuum.