Just wanted to hear if anybody has a similar setup and what kinda numbers they got.

world sportsman 2 heads ( 70cc 200cc )
comp xr270hr ( 218, 224 and getting a 114 lsa )
pcmforlesstune
full exhaust
1.6 roller rockers
stock stall and stock bottom end
stock tpi ( i know this is a restriction but ill get it ported soon )

is this enough for 13s? good setup?
thanks guys

 

I don't think this is going to be much help as to your actual question, but I'd do a little more research instead of just bolting on parts. And I would NEVER rely on a mail order tune for a heads/cam car. WAAAY too many variables.

 

I dont like the heads. They are too big especially considering they will be topped with a TPI intake. Also the 70cc chamber will hurt your compression when if anything you'll want to at least maintain your current ratio and would probably want even more with that cam. The cam though I think is a bit too hot also for your TPI set up anyways. With good aftermarket runners and a after market base maybe even a little work done to them sure I could see that cam working nicely for a hot build but not with stock, not even with a ported stock set up. Not to say a well ported stock base cant do nicely for many applications but the runners will still kill it and you cant port those. Also a stock converter would not like working with a motor like that. Just to get into the 13's you dont need to get too crazy with the motor. Tame it down a bit and I think youll be a lot happier.

 

A gear swap alone would probably be worth more than the head/cam swap.

 

the heads were already bought i got them for a steal and couldnt pass them up.

should i step down on the cam?

get a stealth ram setup first? but then id need a gear swap to get into higher rpms to use the new intake

all i want is a nice street set-up now its getting expensive..

 

lol Yup this is where reality hits you in the face lol. Building up these cars while it may seem cheap on the surface (and is relative to various other cars) when you get right down to doing a build you start to realize just how expensive it is to do things right.

Anyways cheap or not the heads simply wont work nicely on your motor. The heads are just too big. Although you see people talk flow number left and right talking about flow rates alone is only part of the puzzle. A great analogy would be like talking about hp without regard to things like the shape of the curve, RPM, or torque. If a motor produced 500 hp that would be awesome but if it had to rev up to 23k rpms to do it thats not so awesome. This same sort of problem occurs with your heads. According to the max flow rates I'm sure they probably look great. However, to accomplish this flow rate they increased the port volumes and this is where the problem of air velocity occurs. A flow rate is a volume of air that can flow in a given period of time. Being that the port volume is fixed and a motor will only draw in as much air as it needs the air velocity is what will vary to accommodate the different flow rates actually required by the motor. Again because your motor will only draw as much air as it needs, and the ports are so much larger than what your motor actually needs your air velocity wont be very impressive to say the least and that will reflect in your cars performance. The performance will be disappointing with problems like low bottom end torque making the car feel sluggish, poor fuel economy, poor throttle response, and with TPI you probably wont even gain any top end power and even if you did certainly not enough to justify all the down sides. This will be especially apparent in a street car where you spend most of your time in the low RPMs where these symptoms will be most prevalent. Again also your compression is down which I dont think even requires explanation as to why thats bad. So cheap or not those heads will do more harm than good. Honestly you would be much better off selling or trading thoes heads for something else even if you do take a bit of a loss. Even if you take a loss on those heads its still cheaper considering the alternative of what you would have to do to the motor to make those heads work well. For this application even some good stock heads would be better.

The cam depends on the rest of your motor and right now nothing is well defined enough to make any sort of suggestion. I think at this point it would be best to start with a clean slate and talk about what you want rather than the parts you have.

 

Horrible head choice. They are all around too big for you. You're probably better off with Vortec heads and ditching the TPI:
http://sdparts.com/details/scoggin-d...ter/sd8060arpm
with the right cam you can easily do mid-low 13's.

If you insist on keeping the TPI, go with 180CC 65cc AFR heads.

 

Vortec heads are pretty awesome for the price and if he was willing to swap the intake to something compatible (many options exist carbed and fuel injected theres even a Vortec base for the TPI system). However I will say if he did stick with TPI in its traditional form I wouldnt go with AFR heads. They are great heads but the intake doesnt flow well enough to justify that kind of expense. The intake will be a restriction before you max out a set of considerably cheaper heads so there wont be any real loss of performance when compared to using AFR youll just have more money left over.

 

i dont have the money for afr heads i know they are amazing but its just out of the question now.

I dont think my cam choice is too big but after doing more research i realize i screwed up on the heads... my compression will be low.

i know this is a dumb question in the eyes of the experianced but what can i do ( realitively cheaply ) to raise my compression?

 

Sell the heads and buy something with better chamber size.
CR change of the size you are looking at requires different pistons
You can get a little by zero decking the block and using a thinner gasket but not enough that you need

 

Well all I make are suggestions, in the end it is always your choice. The cam in and of itself isnt too radical for the street but its the combination of that cam + factory TPI stuff (even ported factory stuff) that really ruins it in my eyes. Course its all kind of moot because the far more serious issue is the combination of TPI + 200 cc heads. This isnt going perform well regardless of which cam you chose. One of them really has to go and select a cam to match whatever is left. Seeing as how you've only got a street driven 350, the heads are really what should be going because they wont work well for that. However it seems your determined to use them anyways. I realize your probably pretty tired of hearing about your heads why you shouldn't use them but try to understand I can see your kinda new to this stuff and I dont quite think you realize what your getting yourself into here.

As to your new question you can get the heads milled down but you would have to take a good amount of material off. To get your 70 cc head down to like 64 cc, ide guesstimate somewhere like 30-40 thousandths off however I'm not sure how far you can mill those heads down safely. If you do that you will also have to have the intake milled down and may need special length push rods to maintain the correct geometry of the valve train. That should put you back to like a stock 9.5 static compression ratio I believe. How much this would cost depends where you go so youll have to call your local machine shops and see what they charge. However, this may ruin the value of these heads should you decide to sell them later.

 

Sell the heads and get your hands on some Vortecs you may be able to break even there or very close to it. Chalk it up to a lesson learned on builds done my fair share of combos that "dont run" because the price was right (actually it was wrong looking back lol).

Sometimes the best running street motors are milder than one would think.

 

UPDATE***

Got the combustion chambers on the heads measured and they are 66cc's

still on the big side i know but im going to stick with them.

im getting a stall around 2400 and sticking with my cam

im still staying tpi for now but im on the look out for ported runners, bases etc.

 

I'm curious how these heads would work with a Holley Stealth Ram intake?

 

These heads will work ok for the TPI setup, especially if you can do some porting on the base and upper pieces. The cam will work also.

These heads are considered old technology and that's why nobody likes them. They can be tweaked to make good numbers, like most heads can be.

They will work better with a stealth RAM for sure. And more camshaft. Something like a 230/236 comp and a 3500 stall would be effective.

Goodluck!

 

As far as a head , i would go for 165 to 170 cc and keep the chamber at 64cc or lower. I would go Vortec.

 

As far as a cam, for a tpi car it is best to keep the duration low, no more than 220. Lift lower than about 470 or so.