I have a 93 ford f150 with a stock 302 with a 5 speed manual transmission that I'm looking at hot rodding. I'm putting twin turbos on it and need to look at bigger heads but I need to know the size of the combustion chamber so I don't bump up the compression too high for the engine to handle since it will be forced induction. I'm wanting to run .208 intake and .160 exhaust valves. If anybody can help me with this I'd be very grateful

 

The general consensus is ~61.5 CC for a stock E7 cylinder head. Based on this chart: Ford Head Flow Data and Specs

 

I'd start with using the stock heads and getting it all figured out.
And 2.08 intake valve is huge. You don't need anything that large, especially with boost.
What else are you planning to do with this engine. What size turbos. Clutch, engine management, And so on.
Let us know. We are glad to help you plan this out... And spend your money.

 

You need to put a plan together for a comprehensive build and not just throw a bunch of parts together or you're literally gonna be throwing a big pile of cash down the toilet. You can't just bolt twin turbos on a stock motor and expect it to last, with boost the realistic limitations of the stock block is about 400hp which hardly makes it worthwhile, so are you prepared for the costs of doing it right which will mean a complete aftermarket motor and built trans, axle, and suspension at a cost of $20,000-$30,000, or do you stay withing the limitations of the stock block, trans, and axle and only spend about $5k on it.

 

Well as for right now the truck is my daily driver anyway so im going to wait to do any real work on it. But I'm basically starting at the top and working my way down to the rear axle as far as parts, with the job I have it would take me forever to do the complete job so for now I'd be happy with around 400-500 hp. The engine comes stock with forged internals though they're nothing special yet, they are still stock after all. But the engine has close to 200,000 miles on it so I was debating on whether to just get a 351 block and start over on it with the performance parts or just work on the 302 I have in it rebuilding the complete engine. As far the tranny it's a rebuilt 5 speed with a ceramic button clutch. All of which isn't top of the line but it should hold up to the horsepower I'm wanting to get out of it. But I know I'm going to have to work on the rear end either way because it's completely stock and that would just be a waste of time to build up the motor then tear something up in the rear end. This truck as it sits is stock. But I'm basically just getting some ideas on what to do with it. Cash IS an issue though with a job that pays around 400 bucks a week

 

And as for the turbo size I have two T-04e turbos that bolt directly to a pair of shorty headers. And I'm planning on running a cam in it as well but I'm still figuring out what size I want to run. I know the edelbrock E-303 cam is a good choice for most 302s but once again this is going to be a boosted engine, so that changes everything completely of corse. It's basically going to be a big project I've barely got parts for. May take me quite a while to completely finish

 

Umm
Start at the back and work forward. You need to do supporting mods first... It would be like starting a forest fire but only having a fire extinguisher. You should be doing rear end first, fuel pumps, mass air swap, gauges and so on. Then get a chip and tuning software and 42lb injectors and learn that.
Gather parts to do a 351. Don't mess with the 302.
I'd suggest a 351, gt40 heads, efi cam and a single powerstroke turbo. Retrofit a superduty intercooler in there also.
You'll have an honest 400 wheel horsepower. That turbo should do about 450-475 whp for you. That will be plenty of power to wreck everything attached to the engine.

 

So you don't think I'd get close to my goal with a 302? I know cubic inches and torque are what makes or breaks the motor. But if I could get it out of my 302 I'd be happier than spending money on finding a 351. I'm not against the idea however. A 351 would definitely scare away more Chevys on the road than the 302. No replacement for displacement.

 

A 302 will be all top end power, meaning terrible at getting a truck moving from a dead stop.
If you're dead set on a 302, I'd really just get an explorer 302, wiring, computer, and accessories, swap it all into the truck. You'll have a great starting motor, good heads, good intake, mass air, and more important... An easy to tune computer. Go to nearly any sct dealer and they can program it. Then again, powerstroke turbo and deal with the lag, but hold on after it spools.
My 94 mustang lagged some, but with ported stock heads and plenty of boost it made almost 400whp with a good tune.
302 is fine but the block doesn't like much over 400hp on a daily basis. My car got used hard every day and finally failed with an undertuned 150shot of nitrous. It had done 100hp for 10 bottles or so, but I shoulda pulled more timing and ended up blowing head gasket and melting a piston. But at about 550whp it sure was fun while it lasted.

 

Those turbos, if correctly labeled, are good. It's basically a stock turbocoupe turbo called a super60. You'll max them out around 500 if you push it.
I just don't like the outlets on them. Are they wastegated or blocked off.
E303 is a car cam. Overlap isn't right for turbos. Research the cam conanski recommends all the time and get that. It may seem small but its great for boost. I used a z303 cam once in a huge twin turbo 351, it lagged and loped and hated it.... Until about 10psi and then it really lit up hard and was freakin awesome.
Anyway
Those are decent turbos to start with.

 

If you ACTUALLY go through with it and twin turbo your F150, please for the love of God make a project thread. People would be able to help you out, and I'm sure a lot of people would love to see someone twin turbo a truck like ours. I know a guy on another F150 forum who swapped in a Mustang 4.6 and put a single turbo on it, it was pretty cool.

 

The only Ford 5.0 to ever come with forged internal parts was the Mustang 5.0 and even then it was only pistons, the block still has the same low reliable power level as any other stock block so if you ever plan to go beyond 400hp with boost or gas(which isn't hard) then you really should start with a 5.8 block which can handle 700+hp with a forged rotating assembly.

 

Hmm. All this is interesting. I've definitely considered a 351 and will definitely jump on one if I find one. But I'm set on turboing it so ill definitely keep everyone posted on the results. And I didn't realize my internals weren't forged but that sounds about right because everyone that says they are drives a mustang. So I'm probably going to change to a 351 block with the twins I have, and do a little more research on the cam for sure. Because just like with the forged internals, everyone that mentions an E303 says they're great for a mustang motor but once again this isn't a mustang AND it's boosted which is going to make the biggest difference