I'm going to start to build my first engine with the help of my friend who is a big motorhead.

I am going to pick up a 350 bored over .03 on saturday. I plan on using my TPI off my 87' 305 as well as the intake manifold.

I want to get about 300-350RWHP.

With that in mind, must I buy 64cc heads or will the stock 58cc heads work? Should I use 6" rods? 1.6 rockers?

Are there any things I should keep in mind to hit this kind of power? My friend will probably give me advice and suggest a build but I thought I'd get some opinions from here also.

Thnx

 

Appears to be routine 3rd Gen Tech...... moving it there.

 

I`m also doing a 383 what I have is a scat cast steel crank,scat forged rods and hyperutectic(sp?) pistons I`m going for 400-450hp at the flywheel the rods are 5.7". as for you heads I`d get 350 heads the 305 heads will kill your power I`ve heard good things about the world products and dart heads I`m going with AFR there very pricy but worth the cash I don`t think your TPI will hold that kind of power stock so maybe going to a 4bbl will be better? remember the cam is important so do your reserch. I`m new to this to so someone else willl beable to help you better

 

It all depends on how stout you want it to be.. I'm building two engine right now. 1 is a 406 and the other is a 427.. The 427 is on hold due to money constraints. But the 406 buildup should be similar to your 383. Shop around and Shop on Ebaymotors. That's where I got some great parts.. i.e 4340 6" H-Beam Rods for 289.. 4340 Steel Cranks for 500.00 Pistons are up to you!.. First choose between a one piece rear main and a two piece rear main. Then if you want to push this motor to the envelope get some Mildon Splayed 4 Bolt Mains, Get the Crank, Get the Rods, Get the Pistons, and take all to the machine shop have the block, dipped, stripped, maged. Have them put in the mildon mains, align hone the mains, Check the deck square Deck as nessecary, Bore the Cylinders, Then use Torque Plates to ream correctly.. re tap all holes and put in new freeze plugs and cam bearings, Have them balance the crank, pistons, rods, flexplate or Flywheel, Harmonic Balancer, Then put all together..

 

P.S. use 6 in Rods to spin up faster and handle higher RPM applications

 

What you mean? Ill replace the injectors with ones suitable for high HP application.....

 

If you do replace your injectors with larger ones, make sure you get a custom chip to compensate for that.. it should be well worth it. Otherwise the computer will still think you're running the stock 19lbs (I beleive you got a 305?? I cant remember).

The reason why TPI isn't good for high horsepower applications is because it just doesn't flow. It provides good off-idle torque, but above 4800rpm or so it just won't flow very well.

The best things you can do to your TPI is probably port the base, SLP Siamesed runners, port your plenum, and maybe a 52mm Throttle body. Those mods should make it flow much better. But If you want to make high numbers with EFI, you should go with an LT1 intake or a Holley StealthRam.

Just a few pointers to put you in the right direction

Later..

 

I'm only looking to get like 300RWHP out of this thing, I'm not trying to create a moster 600HP beast. I know I'll need to get a custom chip when the time comes, but think I can get away with the 305 TPI at that horsepower? I mean....I don't think 300RW is THAT much.....enough to get me mid 13s hopefully, but nothing ridiculous.

 

300RWHP for our motors is pretty hard to accomplish. Look at my mods on my website, I'm only expecting about 260ish RWHP. I might be shooting too low, maybe I'm shooting too High... who knows.

TPI motors usually have a very broad horsepower range, and the numbers are usually low. But they have ALOT of torque, mine should be well into the 350+rwtq range. Hopefully.

EDIT: 300rwhp for our cars is hard with STOCK intake.

Later

 

Would a 58mm TB be better?

When the time finally comes I'd definately:

Custom Chip
Port work as needed
Runners
Higher flow TB

Should be able to handle 300RWHP no? I don't see how the TPI will have trouble getting 300RWHP, I'm gonna stroke a 350 to 383 and build it up, I know intake is very important (engine has to breathe) but I don't see why it would be hard to get 300RWHP on the TPI. I want to keep the TPI, don't ask why but I do.....I mean, I would THINK a chip and good injectors would get the job done, air flow shouldn't be a huge problem....it's gonna get air, it might not be the "best" setup, but I can't imagine having a "hard" time. If you could explain in more detail exactly what would give me problems I'd appreciate it.

 

i am in the process of a 383 right now
the bottom is complete except cam
i used eagle crank,forged pistons(go with forged now instead of later)
the cam i am using is the comp xr258??
i talked to a cylinder head guy for about an hour and that is the cam he recommended
i am using my stock 350 heads ported & polished w/brass guides
i am keeping the stock tpi for now(will be ported)but would like to change to something else
it is getting headers and 3 inch exhaust

 

Stealth Elephant - You're confusing me, do you mean 300rwhp with the 305 or the 383 stroker??

With a 383 stroker built right, you can easily hit that number with TPI. But with a stock bottom end 305, It would be hard... I don't think its possible

 

i don't think i ever said anything about doing anything to the 305, im just stealing the TPI/manifolds off the 305 and mounting them on the 350

300RWHP on a 350 stroked to 383, with a custom built bottom end using my 305 TPI intake, i want to keep EFI, i was told i can take my year heads, my manifold, and my TPI and the manifold/heads will bolt onto ANY 350, so ill custom build the bottom end, and throw on the TPI intake, intake manifold, and i might buy some high performance heads since the stock onces are pretty low flow, but again as long as i buy the same type of heads that are currently on my 305(angle wise so the intake manifold fits) ill be able to use much of my top end, if i have to port/polish and do a little upgrading to the Intake/TPI thats fine, but i want EFI, i just do. so again, i would THINK it's reasonable to get 300RWHP on that kind of setup

i want to run 13.5s but still be reasonable enough to drive around if i so desire

thnx for all the replies

 

Thats where I got confused, because it sounds like you're talking about the 305 itself, when you're actually talking about the Intake. Sorry Man.

300rwhp should be very reasonable as long as you match your camshaft with the flow of your heads and intake, and you should be well into the 13's.. especially if you can hook up.

Oh and for the bottom end, make sure you clearance everything enough!! It would suck for it to blow up because your rods hit the camshaft

 

"Oh and for the bottom end, make sure you clearance everything enough!! It would suck for it to blow up because your rods hit the camshaft"

With that being said more should be said, You might need to Clearance your block and your rods, as well as get a small base circle cam, I don't know how tight it is in there, but those things must be done to a 400 SBC, espically when stroking..