I'm building a 350 bored 40 over. I was told that would be a 357. It has dished 4 valve relief pistons. Also comes with stock crank. Got any suggestions on cam and cylinder heads that would make this thing run.

 

It's a 350; don't get all wrapped up in the tiny change from the overbore.

That's a shame. Going to be hard to overcome but oh well.

I'd suggest a pair of 96-2000 truck heads aka "Vortec", casting number 906 or 062; a MODERN DESIGN cam with less than .480" of lift, about 220° of .050" intake duration and about 225° of exhaust, NOT a "375 HP 327" cam for example, but something more about like this http://www.summitracing.com/parts/cca-12-238-2; a set of chassis-specific headers for one of these cars (NOT "universal"), preferably spec'ed for a 350, with a 3" outlet; a 3" cat; the 3" cat-back of your choice; an Edelbrock Perf RPM intake; and about a 650 CFM Holley carb such as http://www.summitracing.com/parts/hly-0-6210.

 

I was just looking into some head's off of a suburban. What I didn't know was the part number. Thanks for that info and also the info on the cam. You wouldn't know what type of horse power this combo will put out do you.

 

If the heads off of the Suburban are the Vortecs (as posted above), with the cam suggested and the rest of the components listed, it would be a safe bet to say you could make 1 hp per cubic inch. Call it 350 chp.
My first combination was very close to that although I had an outdated cam. 288 adv/218 @ .050" w/.454" lift).
It was enough to get my 3750 lb Camaro with a stock 700R4 trans (stock converter) and 3.70 rear gear to a high 13 second pass at 100 mph. For what it's worth, on-line calculators suggest that's about 290 rwhp.

 

If the Suburban is TBI (87 - 95), you don't want em. Keep looking. Not hard to find the 96-up in the buzzard nests.

 

Yep heads from a 1996-2002 full size chevy/gmc truck, SUV, van with the L31 5700, 5.7L 350 vortec engine.

Fel pro 1094 head gaskets
Fel pro MS98000T intake gasket set
Summit racing stage 3 vortec intake
Elgin cam and lifter kit #E922M 214/224*@.050", .443"/.465" lift
Howards #98111 valve springs
Edelbrock or Holley 600 cfm carb

1-5/8" tube headers
2600 rpm stall torque converter (if auto trans)
3.23 to 3.73 rear gear

 

I'd suggest a MODERN DESIGN cam rather than those old generic ones like the Elgin. I just used the COMP as an example because the part # has stayed the same since it was introduced, and they make stuff like that REAL EEEEEZY to look up. Another MODERN competitive design is the Lunati Voodoo series.

However if you do go the old cheeeeepo route, get that cam from wherever it's cheeeeepest; since EVERY "rebuilder" cam line carries it, there's PLENTY of choices. Summit is usually the cheeeeeeepest: http://www.summitracing.com/parts/sum-k1103/overview/ You'll be leaving SEVERAL horsepower on the table though, not really worth the money you "save" IMO.

You can overcome the built-in lift limit included in that particular type of head by using LSx valve springs and Comp 727 retainers. They are ALTOGETHER BETTER springs, in every way, than the old straight 1.25" OD stock size ones. Although, the intake side of them doesn't need high lift to work well; but the exhaust is the same sucky exh port as any other small block head, so that side can use all the help it can get, to help it keep up with the EXCELLENT int side.

 

Is this thing a roller cam block?

 

No flat

 

If there's money in the budget, a roller upgrade is never a bad decision. Better profiles, more lift, less duration and you won't have to deal with today's engine oil formulas that aren't flat tappet friendly (although the options out there now for oil and additives are much better than they were just a few years ago).
Just throwing that out there.
Of course any cam you might select will have to take into consideration what your compression ratio will end up at. Big cams and low compression are a terrible mix.

 

I had a setup almost identical to the one Sofa laid out there for you and it ran extremely well. Even with stock 3.08 gears and tires it ran high 13s and I imagine wit some street slicks and 373s it would have been a low 13sec car. My flat tappet cam had 218 218@50 with 465 lift on int and exh so I left my vortecs untouched and it worked well with no issues. I would say the engine had around 325HP. And as you know headers and 3in exhaust from the collector is a must in these cars if you want to get FULL potential out of a 3rd gen.