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Discussion Starter #1
Just built my 383 (specs below). Fun to drive but as I've read in previous post ....HP is like a drug.....you want more. So I'm hooked!

So my question to everyone is what can I do to make more power. I'm willing to spend up to $2k......don't really want to spend it all on this but that's my budget. I'd like to make 500hp if possible.

What does everyone recommend? This is a weekend car and maybe some track time on occassion but mostly street. I'm assuming some may say nitrous........I have no previous experience and a little gun shy from a lot of the horror stories. I thought maybe a simple 50 shot so I wouldn't have to mess with timing, etc?

Thanks in advance.

New GM 4 bolt main, Probe Industries SRS forged pistons, Probe cast crank and Probe forged rods. Bearings (rod and main) are Clevite perfect circle (P-Bearings), Roller Rockers are Scorpion Performance 1.5, Isky Hydraulic Roller Camshaft custom made and custom ground cam (Duration 282 / Cam Lift 353 / Valve Lift 530......duration at .050 is 234) Manley Pushrods, Gear Drive Set – Cloyes, Heads are Aluminum Patriot Performance 185cc Intake and 64 cc combustion chamber (2.02"/1.60"), Compression 9.86:1 - 9.90:1, B & M 2400 Holeshot torque converter, 4.10 posi rear end, Headers, Holley 750 Double Pumper, Victor Jr Manifold, March Mid Mount Pulley System, Electric Fan.
 

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First two things I would do is add a 1.6 Rocker to increase the lift slightly and ditch that Vic Jr Intake for an Air Gap. You have a stout combo as it is...Vic Jr is hurting you. Next I would ditch the heads a and get something in a 210-215 runner.
 

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Discussion Starter #3
First two things I would do is add a 1.6 Rocker to increase the lift slightly and ditch that Vic Jr Intake for an Air Gap. You have a stout combo as it is...Vic Jr is hurting you. Next I would ditch the heads a and get something in a 210-215 runner.
What gain do you think I might realized.......I know it a guesstimate.

Also what heads do you recommend, cc, etc?

Thanks
 

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Sounds like a powerful setup already ! :D

What about adding a gear vendors overdrive so you can take it on long trips? :yes:
 

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Discussion Starter #5
Come on I know you guys can give me more that.

Don't worry I won't be offended. My current build was recommended by a friend and I had a limited budget so went with the patriots. So far so good but I know I can get better flowing heads.

Thanks in advance.
 

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I don't know anything about those heads, but if they were a bit bigger runner I would say mill them to get more compression and port them, but I would say if 500 horse is the goal you need to sell the heads and get something closer to a 200cc runner, 185 is not going to cut it on a 383 imo.

The cam would probably work for now with better heads, but I think you could easily use more cam. 1.6 rockers as mentioned would help, but alone will be minimal I think. What's the lsa on the cam? Seems you could use about 10* more duration to me. Who specd the cam?

The bottom end looks real good, so with some care you could real easily run a 125-150 shot on it. Don't mess with less than 100 though, I think you'll be disappointed.
 

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Discussion Starter #7
if 500 horse is the goal you need to sell the heads and get something closer to a 200cc runner, 185 is not going to cut it on a 383 imo.
Thanks Sean. A friend of mine also recommended new heads with 200cc runners. I've been looking at AFRs but I didn't see a 200CC. They have 195 and 210. Would you recommend going to a 210cc runner with 64cc chamber?

The engine shop near me also said the same thing about the 200cc runner. He said he likes the AFR since their base heads are so good out of the box.

When I checked Summit there's some many versions with race porting, competition porting etc. Can someone help me pick the one thats the best for my application? Don't mind spending a little more if the additional porting work will generate more power.

Thanks!
 

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Heads will make the biggest bang for the buck :yes:

195/200 cc heads (RHS/Dart/Profiler) will wake it up... I'd say with no other changes you will see 50-75 HP jump over those Patriot heads.
 

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Discussion Starter #9
Heads will make the biggest bang for the buck :yes:

195/200 cc heads (RHS/Dart/Profiler) will wake it up... I'd say with no other changes you will see 50-75 HP jump over those Patriot heads.

Thanks Doug

Would AFR 210cc runners be too big? I know your 50-75hp jump is just an estimate but what if I did some head work like porting, polishing, etc?

Thanks again!
 

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210/215 would be more "max effort" IMO and could be lazy on the bottom end ?
 

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A 210 would be fine, but you will want to get more compression to go along with them. I would shoot for more regardless, like 10.5:1. If the compression is optimized it wont be lazy. Are you positive of your current compression? If so you need less chamber than you have currently.
AFR are good, but for bang for the buck look at RHS also, I had a set of them on my 406 and they worked very well, and I have heard good stuff about profiled but no first hand experience. Look on sites like racingjunk.com for some used heads also, if you find the right deal it can save you some cash.

Do you know what the LSA is on that cam by chance?
 

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Sorry LSA? Lobe Center is 110*
Ok I think we are talking the same thing, lsa = lobe separation angle. If its 110 then that sounds like more reason to get a bit more compression if possible, that cam probably is pretty smooth but probably not helping your power needs currently.

Are you positive of the compression? That sounds low, must be a dish piston? Do you know if it was zero deck?
 

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Discussion Starter #14
Are you positive of the compression? That sounds low, must be a dish piston? Do you know if it was zero deck?

Yeah the pistons are Probe SRS forged 383 Dish Top -12.8cc. With 64cc heads compression should be 9.9 to 1 (approx).

With this info do you think I can go up to 210 runners and use existing cam without it being a dog on bottom end? AFR has a comp version that is CNCd in 65cc and one in 75cc......which one would be best for my application?

My car is primarily a street car so stop light to stop light power is most imnportant.

Thanks!
 

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Well definitely not 75 cc chambers, and if possible try to get smaller to get some more compression.
I don't think it will be a dog with the 215s but if you plan to keep the cam for awhile and don't plan too much more growth go with the 195 probably.

That cam is probably good for what you have and better heads will definitely make more power alone. I never reccomend cams either, way too personal preference, what's good for me may not be good for you, and heck I let my cam guy just tell me, lol.

If it was mine, I would find a good set of heads in the 210 range and shoot for less than 64cc chambers, then upgrade the cam as money allows. The 210s give room to grow when the bug bites again. Heck with a touch more compression and better heads, some 1.6 rockers, and I think it will keep you happy for awhile.
 

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Discussion Starter #16
If it was mine, I would find a good set of heads in the 210 range and shoot for less than 64cc chambers, then upgrade the cam as money allows. The 210s give room to grow when the bug bites again. Heck with a touch more compression and better heads, some 1.6 rockers, and I think it will keep you happy for awhile.

Thanks Sean.....I appreciate it.

So just so I understand smaller than 64cc chambers if possibe to get greater compression. I always seem to see 75cc and 64cc.....is a lower cc chamber common out of the box? I think you were recommending RHS.
 

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Discussion Starter #17
Just check Probe website and with the pistons I have and a 58cc head the compression ratio woud be 10.51 to 1.
 

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I hear some great things about the Profiler heads from Chad Speir. No first hand experience here as I use AFRs but do a search and you will find plenty of debate. LOL!

The head swap is going to have you knockin on the door of 500. If you really want to wake it up, throw some stall at it. If it is mostly street you may not want to but it will make a huge difference in e.t.

How about some "free" ideas? One of my favorite modifications was locking out my timing. It will make a huge difference down low which is where you spend a lot of your time on the street.

Cam, heads and converter are the parts that have made the biggest difference for me over the years. Well, except for the blower but that's out of budget.:D
 

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Thanks Sean.....I appreciate it.

So just so I understand smaller than 64cc chambers if possibe to get greater compression. I always seem to see 75cc and 64cc.....is a lower cc chamber common out of the box? I think you were recommending RHS.
No problem glad to help!
Yeah the smaller chamber will boost compression a bit. It will be fine as is and heads will definitely help, but I think in your case even under 1 point (10.5:1) will help. Compression is not the holy grail but it can make the difference in some cases.
Not sure but there are guys selling heads with less cc, check out RHS and as Greg points out I have also heard good things about Chad Speir and the work he does with Profiler.
I think a 60cc chamber would put you roughly at 10.5:1 (just a guess) based on what it has now with 64cc, but before you take the plunge to new heads you should try to verify if the piston is "zero deck" or the top is at or slightly below the deck at top dead center. And since you know the piston dish and bore/ stroke you have the rest of the pieces.

The good thing is the bottom end is solid and you can easily grow.
 

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I'm running a 383 in my '33 Ford, using Wiseco forged pistons, 6.0 rods 10.9 (tested) compression, 294 Comp Cams roller cam, 1.6 rockers, Victor Jr. Manifold, 1" spacer, 770 street avenger, Edelbrock RPM heads 64cc chambers, with the runners on the manifold and heads opened up to allow 200 on the flow meter, 1 3/4 Sanderson block huggers and a few other minor pieces and it turned 517 hp on the engine dyno, so maybe doing a little head and manifold work might get you over the 500 mark, although changing heads to a AFR head would be a lot simpler if you've got the bucks. Good luck with it. Bill
 
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