Vortec headed 400 truck build up cam and using my heads?

I'm building soon a SB 400 to replace my Vortec headed TBI 350. It ran well and lots of folks do 383s in their trucks so why not a 400, I Have the block.

I'll need some cam help.

I all ready have Vortec heads with 2.0 /1.7 or so SS valves bowl work and mild port polish. New springs/ retainers/ locks/ seals. I bought them for a decent price and used them on a 350 in my truck. I all ready have GMPP 1.6 roller rockers that are self aligning and the GMPP TBI Vortec intake was on it. The Vortecs even had the steam holes drilled before. LT Headers and bigger 90lbs injectors and 50mm throttle body.

The 350 spun rods, cam, probably mains to. Makes me sick.

So I pulled my 400 block I bought last summer and it is in line at the machine shop it had all ready been checked for being sound prior to me at the same shop.

Will the Vortecs choke it. My other 400 has Dart Pro 1s 215 ports 64cc with a nice inverted dome, but it is a little higher strung even with w 3000 stall and 3.73s. Pulls hard to 6200+.

If I blow the 400 some day or want to pull it. I made the plan to use the 64cc chambers on a 383/396 SB. More and more common for 64cc heads every where.

I was going with a 9:1 piston with 5.7 rods.

I thought the Vortecs were good to 400-420 HP.

Wouldn't the port velocity help make torque down lower?

In my case it won't see more than 5500. But this truck is heavy.

It will have retro fit hydraulic roller lifters and a decent cam considering it is 4x4 with a 2500 stall 3.73s an a 29-30 inch street tires it will need torque.




CAM selection... remember retro fit hydraulic roller camshaft???

Torque and pulling to 5000-5500 a plus realistically 5K

What is the combo good for number wise???


Help. Please

 

Stock Vortec heads can't be ported large enough to work well with a built 350, let alone a 400. Get some GMPP large port Vortec heads, they are MUCH better, even in the low RPM torque department. Bare head part number 255334371 for 215 cc. They even have thicker deck surfaces (known failure point of stock Vortec heads) which will work better on the "head cracking" prone 400 block.

 

Quote-I all ready have Vortec heads with 2.0 /1.7 or so

These are not the stock valve sizes, I think these would be great heads for a torquey (not high strung) 400 sbc!

 

I think you're going to have problems getting the reluctor ring to work with the 400 block. The plastic timing cover for the Vortec engines only fits late-model 1-piece seal factory blocks. In order to get your 400 working with the Vortec EFI system you will need to modify an aluminum front timing cover to accept the crank position sensor. It will need to be a timing cover large enough to fit the reluctor ring on in front of the timing gear on the crank. The timing set will probably need to be a single-roller chain setup because dual-rollers are too wide. You won't be able to use the Vortec single-roller timing set because factory roller cams have a smaller bolt circle for compatibility with the steal thrust plate that hold the cam in position. Retro-roller cams use the old bolt pattern. (do not try to use a gear drive - not compatible with knock sensor)

 

I think you missed the Vortec headed TBI motor. It is in a 95 with TBI. Not 96 up with multi-port injection.

Thanks, For the info though.

It should get dropped in next weekend.

Let you know how it runs.

 

If any of you are interested I have pictures of my port work and engine assembly at my web shots page.

http://rides.webshots.com/album/562900897Kwqvqk

I'm wanting to add an external fuel pressure regulator. I bought a cheap import one that was posted on another board or on here had been used. Mounts in the return line. Lines look so small.

Thinking I might as well spend the money on an Aeromotive or Holley AFPR. And use A/N fitting with -6 lines.

Engine should be going in this weekend. Hope to hear it run soon and then See how long the 4L60E will last.

 

THe cam I'm using is on a 112 LSA .519 lift duration 217 Intake and .500/221 on the exhaust.

http://good-times.webshots.com/photo...30004544vdNLcp