So I bought a set of AFR 190cc CNC ported heads (they're the older style) with 2.05 intake, 1.6 exhaust valves that 'should' flow about 280cfm according to the buyer. They have springs good too .575 lift and are 58cc combustion chambers

I also just receintly sent a check in for a superram plenum, runners and accel base.

With that, I also have:

350 bored .040 over with 4 bolt mains
6-speed
Hooker long tube headers
24# injectors @45psi
1.6 self aligning roller rockers
4.11 gears
K&N air filter
Flowmaster exhaust.

Now, what would be the best cam for mid and upper RPM power with the superram that would stay under a .575 lift (that's the coil bind height on the springs). Would a Comp 503 grind work? If what, what duration should I be looking at? I know the LPE 219 cam was meant for it, but I wanted slightly more duration to possible stretch the upper RPM capability, which leads to my second point:

What is the superrams powerband? I searched low and high on this and the corvette forums for dyno graphs for a 350-357 motor with the superram setup. What RPM is the peak power with these runners? I wanted something around 5500RPMS or so, maybe more. I just wanted to know what the best shift point was and if I could keep it in 4th the seldom few times I actually go to the track.

Thirdly, what else do I need to get everything to work? I figured on head gaskets (.039 compressed thickness to raise CR), intake and exhaust gaskets, plus new head bolts. But what else?

Are the 24# injectors I got still ok to use?

Should I get a bigger throttle body?

Can I still use my self aligning 1.6RR or do I need non-self aligning? And what about this valve guide machining I hear?

The motor has less than 6k on it, do I need to replace the timing chain?

And finally the customary: with a good tune, could I see 350hp at the wheels? That's my goal.

Thanks!

-Dave

 

My 360 pulled to 6000 RPM and peaked at 5800 RPM.

 

Any info on the cam?

 

im running i forget its either comp cams xe274 or 276. Duration 224/230 and that put peak power right at 6000 with setup in sig.

Youre going to want to be hitting peak power well as high as possible. If the bottom end will handle it youre not going to want to be shifting before 6500 rpms. IMO from what ive read on this board the 190 is a little too much head for a 355, thats why they stopped making it. the 180 is better for a 355 and the 195 for a 383. That being said youre going to be making all top end power so take it as high as you can.

i would think something in the 232/240 at .050 range for duration, making the sort of lift numbers youre looking for. Valve float is going to start to become a serious issue with the motor youre building so youll probably need to address that.

you asked if you should be upgrading your tb but i dont see what you have now. Regardless for this combo youre probably going to want a 58mm tb, altho if you already have a 52 it could probably survive on that

i dont have answers to the rest of your questions.

 

The cam was a Comp Cam 08-503-8 .503 Intake .510 Exhaust Duration @ .050 Intake 224 Exhaust 230

 

something like this maybe?

http://store.summitracing.com/partde...8&autoview=sku

when it says with factory rocker arms, im not sure what rockers those lift numbers are with but id have to guess thats with 1.6's

 

The new AFR's should have holes (not slots) for the pushrods, and may have guide plates. Just leave the guideplates on a shelf to collect dust, and use your self aligning 1.6 rockers.

That xfi grind would be an awesome cam, but it's huge. Would be a bear to drive around.
Need more injectors to reach that power level.

Is the super-ram good for that cam? I don't think it can flow that high, that cam would be best up in the 6000RPM range. I think that's the range where you wonder if you should still be using a hydraulic cam. Stud girdle and/or a..... name escapes me, the extra springs that you put on your lifters area.... damn... You know what i'm talking about.

 

rev-kit

 

i know that was one of the more extreme cams i could find lol. I dont have any actual experience with afr 190's in real life, but from everything ive read they are a LOT of head for a 355.

the motor will be all top end, so the higher he can take it the better.
something like this would actually be a lot more reasonable
http://store.summitracing.com/partde...8&autoview=sku

 

http://store.summitracing.com/partde...8&autoview=sku
and this being the next comp cam grind down that i can find, lift is starting to drop off tho, not sure what sort of numbers youd get with 1.6 rockser, probably in the .55 range

 

The throttle body I have is a stock 48mm.

Can the 350 motors rev to 6500 with the stock hydraulic roller lifters? That'd be nice.

I don't see why not, how were they (lifters) any different than the LT-x motors?