Hey guys I need help with my engine build, Im suck on finding heads and cam please help.

350 4 bolt 2 pc .030 over block

Scat 9000 3.75 crankshaft 935050

6 inch rods
ARP bolts

Sealed Power 8-KH124CL30 Speed-Pro Hypereutectic Piston and Ring Kit
Piston Dia. 4.030''
Piston Top: Flat Top, 2-Valve Reliefs
Floating Pin
Moly Rings

Dura-Bond Coated cam bearings CHP8T

GM Damper 8 inch 6272222
GM Flywheel 3973456n

No intake or carb yet

4 Speed Super T10
Center force clutch

Im looking for some camshaft and head suggestions. Would like a whole kit with push rods, rockers, springs, etc. Im hoping to get near 500hp, Mostly street will take it to the track once in a while. Please help guys thanks!

 

Ok... Those pistons are 5cc volume and the compression height of 1.130 leaves the piston sitting 0.005" in the bore at TDC on an un decked block.

So you will need to use a head gasket around .035" - .038" thick..

Using a 4.100 x .038" gasket I come up with
64cc heads... 11.015:1 compression
68cc heads... 10.528:1 compression
70cc heads... 10.302:1 compression
72cc heads... 10.086:1 compression
74cc heads... 9.880:1 compression

With the 500 HP goal, I recommend 68 or 70cc

Do not look for a full top end kit, those will not have the best matched heads/cam for your needs. You are much better off buying part by part.

195-210cc intake runner. I think I would stick with 200cc being the largest being you said mostly street use.

Brodix IK 200cc, 70cc chamber heads
AFR 195cc, 75cc and have them milled by AFR to 68 or 70cc
Dart Pro1 200cc, 72cc
Pro-filer 195cc, 70cc

Now for the cam, are you wanting to go with a retro fit roller cam swap, or stay flat tappet? If you stay flat tappet do you want a hyd or mech. cam?

If flat tappet, here is a few ideas.. You will want a LSA around 108 and duration at .050 in the 240-250* range, with as much lift as you can get

 

Do a retrofit hyd roller. 230 deg or around that. Mid .500's lift. 108-110 lsa
Afr 195, profiler 195, jegs 195, dart shp 180, brodix ik200 etc those are all good heads with afr being abit better out of the box imo with profiler being close 2nd. Takes a good head to make honest 500 hp

 

Thanks! most likely going to go with the brodix IK 200cc but why 70cc chambers? 64cc too high of compression?

 

If cam is big enough you'll be fine at 11:1 comp on 93 gas

 

Yeah the 64cc as you seen in my post puts you over 11:1 compression.. Yes this can work on pump fuel BUT it will need the correct cam (which will be much larger) and therefor kills off alot of the street use of car.

Being you said "mostly street with track once in a while" I feel it's better to drop compression into the mid 10's, run a smaller cam, give up the 30 HP or so for the better vacuum, throttle response, low and mid range torque, and safe 92/93 octane fuel use.

10.3:1 is nothing to laugh at for sure

 

The brodix 200 heads would be good but I would go with the 70cc heads, it will put you at a good compression for gas and a large cam. I would recommend the RPM air gap intake, 750 DP and cam COMP Cams#249-12-678-4 or something very close. Any thing past 6K I go solid if its a flat tappet cam. They seam to make more top end and you don't have to worry about lifter pump up.

 

The parts I am recommending are probably around 425-450 HP. I would go with larger heads, single plane,more compression and larger cam if I was trying to hit 500 HP and depending on the weight of the car and gearing a larger carburetor.

 

ok yes smart thinking, are these the correct ones http://www.summitracing.com/parts/bro-1021007 I am looking for high torque also

 

Imo you really would have to get biiiigg with the cam to kill off the streetability in a 383 sbc. I mean 240 deg + at .050" in an automatic car. Manual cars can be touchy where cruise speeds are in gear with certain cams. Get surge effects. Really dont get that with stalled autos.

My 383 was 11:1 with afr 195's. Holley stealth ram efi ported out. Cam hyd roller 230/245 109 lsa .603/.613" lift. Idle was very mean but that car drove like grandmas caddy when tuned right. 400 whp 380 wtq. 119 mph in 1/4 mile. Break your neck in a first gear 4500+ rpm rolling start.

Streetability has alot to do with how well tuned the combo is.

500 hp is alot and does take some cam and heads to get there.

 

I want to at least get the torque over 500.

 

Thats abit more difficult than actually making the hp. Might need to try some kind of megaported superram type intake or shoot for more like 550-600 hp with a 400" motor