Ok guys I am new to performamce after market upgrages. I alredy have all of the ultimate tbi mods and I want more power I have a 350 engine. I want to know whats the best heads to get for my set up. I have hooker headers and performer intake what heads will work best for my car. There are so many out there and im unsure of what ones will fit my car.

 

I don't think you can get a major improvement with aftermarket heads on a TBI engine. Certianly not enough to justify the cost.

As you probably know ,the biggest problem with the TBI is the Trottle Body. It is what limits performance due to its low CFM rating.

That said, if you must, I would suggest Summits 170cc heads for 87 up engines, aluminum so you'll get a weight savings too, and you can keep your current intake.

Another option may be Vortecs. But they would require a Vortec specific intake.

How more power do you want?

 

I have a 454 throttle body and adaptor plate to bolt on if needed wich should provide a lot more cfm than the smaller throttlebody and injectors .I want a 400hp car if possable. I also read om here that the throttlebody that I have should support it.

 

You can get a major improvement with TBI if you are willing to do your research, and if you want 400hp NA you are going to need a lot of money. You probably want to be looking at AFR or Trick Flow heads and probably about 195cc runner volume. Those heads and a good cam should get you to 400hp. Then after that you are going to have to upgrade your fuel system and get into prom tuning if you haven't already. Buy the EBL, get rid of the stock TBI pump, switch to vacuum referenced fuel pressure regulator, upgraded injectors, etc.

 

But then the question is why?

AFR 195 heads and related build, you'd still be restricting power with a TBI set up.

The TBI was never intended to be a performance system.

 

So would I be better off getting rid of the tbi system first and switching to carbed. I should only need upgraded fuel line a fuel pump, distributor and a carb I alr eady have the eldelbrock 3607 intake.

 

It depends on what you plan to do with the car.

Is it a daily driver?

Weekend cruiser?

Going drag racing?

I would not go to carb unless its a dedicated race car.

Daily driver, stick with tbi,

weekend crusier/ street strip car, consider a Stealth Ram or Mini Ram.

 

If I get the stealth ram or mini ram what will I need to change. Its not a DD its a weekend summer toy at the moment. If I succeed in getting the hp that I want or more. I will most definitely take it to the drags at indy raceway and try my luck. Momey is not that big of a deal looking to spend a few gramd if needed but if I can avoid spending that much that will be great.

 

You need to research doing a TBI to TPI swap. That is basically what swapping to a stealth ram or mini ram is. Then you'll still have to get heads and everything else. Obviously it would be cheaper to keep the TBI, but a good port injection setup would probably make more power than a wet flow system like TBI or carb.

 

If you want to keep the tbi, then I would call this a budget build. Get some vortec heads & carbed intake, use a tbi/4bbl. adaptor plate. Read the stickies.

 

I do understand your point of wiew, as that is what comes out by using half of the online calculators, though those calculators should not be taken too seriously.
Look at the exemple of the 46mm TB on my 360 TBI with these heads https://www.thirdgen.org/forums/tech...ads-clean.html.
As you can see the MAP reading is not showing a major restriction https://www.thirdgen.org/forums/atta...sb-360-tbi-2-3 and even if the MAp would drop 1 or 2 KPA less with a larger TB, it would not result in noticeble hp gains.

In this case the Intake is certanly the weaker link, but there are so many good and affordable intakes that can be used with TBI, including single plane intakes.

Main concern with TBI is the reduced number of injectors (2), yes it is not an easy task to have anough fuel at 5700 rpm and then pass idle emission test with the same settings and tune.

I mainly agree, this sums it up.

 

I wouldn' mess with a stealthram or miniram personally. Get you a nice set of heads, stock Vortecs can easily make over 400 HP and a single plane intake. Use a 454 TBI unit or bored small block TBI and run some 61# injectors at 30 psi. I ran a vacuum referenced regulator that dropped the idle pressure down to 22-23 psi. You can fuel 400+ HP easily with a single TBI. Not to mention you can get the EBL setup with an upgraded to run a dual TBI setup. 2 regular old 350 TBI units are more than 900 cfm @ 3.0 in/hg and flow more than enough to make 700 hp. The 445 CID 390 based FE Ford I am building for my 68 Galaxie 500 will be dual gm TBI injected and its going to be a drag car running nitrous.

 

FAST

Did you ever had a chance to play with EQ’s Vortec Hybrid head with a heat riser (p/n CH350G)?

//RF

 

Thanx fast I think im going to take your advance and stick with the tbi system after all I just bought a 454 throttlebody with built in fuel pressure regulator #61 injectors shouls easly get to the proper pressure and eldlebrock carbed intake for a couple hundred not long ago. now all I need is the tpi fuel pump. I was think ing of som RHS heads. Are the specs ok or should the chambers be smaller.

64cc combustion chambers
220cc In take runners
74cc exhaust

 

64cc chambers is probably ok, but imo the intake runner is on the large side for a 350. The most popular choice seems to be 180cc or 195cc intake runners on a 350.

 

Way too big

 

I ran 230cc Dart Iron eagles with 2.08/1.65" valves in them, 64cc on the 383 in my van for a while. Even with a mild cam in it, it was a MONSTER up top.

 

What about these heads has anyone used these. There cheap so not sure if they will get the job done. The down side is that they are for pre 86 manifold. I can always switch the 87-95 manifold for a pre 86. As they are easy to come by and will easly work with my block and 454 TB. My plan is to install the heads, cam and 1.6 rockers and maybe 100-150 shot of juice then tune after im done installing all hardware. Im looking to buy the parts asap and am compiling a list of parts to get and definitely need your guys help.

 

I it was me I would try out Pro-filer's cylinder heads
https://www.thirdgen.org/forums/tpi/...nder-head.html
http://www.profilerperformance.com/r.../sbc-23-degree