crystal383

I'm going to upgrade my heads. I was wondering who makes the best flowing out of the box cylinder head? I was wanting to get some heads that I didn't have to port or polish to get good numbers. So I can just plug and play. I'm running a 1st Gen pump gas 383.

sofakingdom

iTrader: (1)

Define "best".

What is the car used for? What are the supporting parts? What cam, lifters, rockers, compression (MEASURED, not "catalog", starting with MEASURED deck clearance on all 8 and MEASURED piston dish/dome volume), gears, converter? What RPMs do you want to run at, what are you willing to give up (i.e. how much driveability, gas mileage, longevity of other parts, $$$, time, attention to detail, ... etc.) to get "best" however you define it, what's your budget, how much experience do you have with setting up things like offset-intake shaft-mount rockers, ??? The list could go on forever.

Or you can just do like everybody else and slap a set of AFR 195s or Dart 200s or something on it, and have "pretty darn good" even if not "best".

crystal383

Ok. I'm running an iron block 350 out of a 79 c10. Its been bored 20 over. Its got a fully forged eagle rotating assembly. The crank is 3.75 stroke, its got forged eagle I beam rods, and forged SRP pistions dished -10 cc's. Its punched !0 in the hole. I originally bought cnc'd dart pro 1 platinum heads used offline. So I was looking at 340cfm. And so I told the shop that was dialing everything in to grind a cam for my set up. Turns out when I get the heads in the mail there was piston slap on 1 chamber. And the dude hand ported too big and went through the pushrod guide. So he jb welded a brass tube to work.

Like I said my cam was designed for a 340 cfm head. So I'm trying to see if I can find an off the shelf head that will flow that.

By the way, my cam at .50" is 248/252, 598 lift, @ a 110 lsa. After I got screwed I just bought some off the shelf fully put together DART Iron Eagle Platinum Heads. They have 230cc intake runners but I doesn't flow what I need. I just wanted to know what off the shelf head for a sbc that would flow 340+.

And also my car is an 87 iroc 1le with an lt1 t56 and a 4'th gen rear end. Its got 3.42's at the back

cuisinartvette

do you plan on reagearing?
Hydraulic or solid cam?
Why does it have to be 340...max intended rpm?
compression ratio?

Orr89RocZ

iTrader: (20)

That 383 will never use a true 340 cfm...unless very highly developed shortblock and induction package with high rpm. Thats over 700 hp worth of air and to do that a 383 would really have to spin up. Not gonna happen on pump gas. And the cam aint big enough to get to 340 cfm either, most heads that flow 340 are at .700-.800+ inch lift

That said, also nothing wrong with porting thru pushrod pinch and putting tube in there. Common on max effort 23 deg heads but sounds like the head is way to large for you anyway, being that it flows 340 cfm. Thats like a 235+ cc casting and commonly used on 400+ inch motors. Again too much for a 383

"Best" set of heads for that application is something like a custom hand built setup from a smaller private sector head porter. Like Speier racing heads, Weingartner heads, etc
They can set the heads up with a proper spring package for the cam and know exactly what port size needs to be

I think with that cam and max effort pump gas build, i would try speier's small bore 227cc head. Or a ported profiler 210 casting. More than enough head for that setup