Hello every one.
Iam new to the forum but have been lurking for a while.
I have searched the site for different topics and have found some interesting information.
I would like to ask a few questions about me and my son’s project. He is 17 and has an appointment next week to take his drivers test, so you could imagine he wants his car back together.

Hope you all don’t mind.

We bought a 1987 z28 black on black with t-tops.
We towed it home on a car dolly about 8 months ago about a 5 hour drive.
It had a 305 TPI with auto; it had a spun piston rod bearing and a broken ring in that cylinder, after taking it apart and sending the crank to get a re-grind I decided to go with a late model 350. A buddy had a short block that came out of a State Patrol car that broke a ring at 30,000 miles, So that what we I started with, just the short block.
Heads
I took my original 305 heads in and had new bigger stainless valves new crane springs and also had them ported and polished, they are, I believe 52cc heads. The head shop said that they were the nicest 305 heads they have seen. An exceptional casting
Bought new roller lifter as well
Cam
Bought a LT1/LT4 hot cam
I believe .490/.490
New hydraulic roller lifters
Pistons
We had the motor bored .060 over to clean up the bad cylinder bought 70 cc dished 4 relief valve pistons (upgraded to better quality piston). Trying to keep the compression to 10 to 1 (not to exceed)

Now we are getting ready to put it all back together.

I will use all the 305 stuff to bolt on to this new engine.
I had the tpi intake and runners gasket matched and glass beaded as well.
What else can I do?
Coolant by pass? How do I this?
New fuel injectors? Will the old ones work? ( they are stock 305 I think)
Adjustable fuel pressure regulator? Will it work with the stock fuel pump?

I have yet to buy a stall converter, maybe 2400 RPM’s (to big?)
I also have not bought a new chip yet? What do I buy? Do I need a custom chip burned or
Can I buy a stage 2 or something?

What kind of horse power can I expect from this engine, roughly?

Any other comments or suggestions would be helpful.
Thanks
A dad and sons car project.
Thanks
scott

 

Injector wise I would at a minimum go to 22# like on the stock 350 cars. Can get by with what u have but now u have upped the cubes and also extended the powerband

Ford Motorsports aka SVO 24# are the best out there bang for the buck wise.

Is that the lt4 hotcam? Would be 216-226 and .498lift with 1.5 rockers?

I wouldnt waste time with a stock base on that combo preferably.

Its a bottleneck on a stock 350 and unless heavily reworked(this isnt a flame war, I have taken a ton of material out of stock intkaes before)I would sugggest investing in a new or used aftermarket base and runners. Did they knock down the walls behind the TB in the plenum?

U will need some definite help in the prom tuning dept. Especially if u up the injector size. Hit the prom boards for info on how to do it yourself, which is what I would recommend. For about $500 u can be burning chips and have a wideband 02 sensor and a great running car tailored to u and your sons driving habits.

Figure 2-300$ for someone "qualified" to tune it on a dyno or the like or a lot of time dealing with someone thru mail order, which isnt fun either.

later
Jeremy

 

Yep,
Thats the one. lt4 hot cam just like you said.

As far as the base go, can I keep the runners for now, and just replace the intake base?

If I use what came of the 305 what can I expect? problems?

if I use the stock injectors fot now what will happen, just not at its potential?

Can I run it with all the stock stuff for now or is a prom required?
with the cam?

thanks
scott

 

A dyno tune is great for 1/4 mile, but that doesn't mean you'll have a decent tune for driving the car on the streets. Those are two completely different things. A stock tune won't run well, if at all on your setup. Stay far away from anything with the title "stage #".

You can use the stock intake for the moment, it won't hurt anything. Only hold you back hp wise.

I highly suggest getting something other than the 305 injectors, getting a 90-92 350 knock sensor, and a custom prom.

 

Good info above, just for clarification, you're using the crank from the 350, correct...and not the reground 305 crank?

 

It's the same crank only lighter.

 

Yes, it's probably a bit lighter, but balanced to the lighter weight 305 rods, in most cases.

Pretty sure RB83L69 posted some pics and info on this in the past...I guess as long as it was rebalanced with the 350 rods it'll work okay?

 

Rods are the same. It's the 305 pistons that are lighter, and if he went with a quality forged dish, it's prolly close to weight.

Even still, i'd balance the rotating assembly.

Rather than spending a ton of money trying to get the TPI setup to work properly on the new motor, I'd go with a HSR.

-- Joe

 

Take a look at this post, looks like only certain 305 rods are the same, but seem to be the minority.

https://www.thirdgen.org/techbb2/sho...light=305+rods

 

Scott where in Washington are you? You should check out www.cascadecrew.org . We have several members there who could help you with the tune. We also have some nice get togethers at various times of the year. Including a dyno get together and racing sometimes.

 

I'm using a 305 crank in my 355cu in engine and it works fine. I'm using Keith Black Hyperutetic pisions 2 valve relief and I think they weigh somewhere under 460 grams and powdercoated pink rods from the Vortec engine.

 

I will be useing the 350 crank, not the 305 crank.
I thought they were different anyway.
I am in puyallup
So with that cam, can I go with the 24lb injectors or do I need to stay with 22lb
I allso would like to use all the runners and stuff off the 305 for now.
then later install the bigger ones.
I will also go with a new chip right now.
how will it run with this set up.??
I need all the information I can get
thanks
much scott

 

Are you using the 305 heads on a .060" 350 block?

 

I'd take a real close look at the coil bind and retainer to guide clearance on those heads with the high lift cam. I'd say you are right at the limit if not beyond. That's a lot of lift for the 305 heads, flow wise, not sure the ports are big enough to need that much cam, won't hurt anything though. The Ford injectors are probably the way to go, or a set of 24# Accel might do the job as well. Not sure I turn a 17 year old loose with a car like that, a three cylinder Metro would be more like it judging from my two boys.

 

Yes heads have been worked over real good.
305 heads, they are nice.
.060 over 350 pistons 70 cc dish




Yep, coil bind has been checked and clearanced.
I was given an under .500 gross lift spec to stay within.
Yep we went right to the limit.
But Iam kind of hoping that the 305 tpi intake and runners will re-strick it some what, not enough air. But hoping it will run ok
Will it????

My son has worked all summer and has made some money, he is spending his on money on at least 1/2 to 1/3 of everything, including the purchase price of the car. The remainder I am paying for.

He will have to pay his insurance. hehehe.
But hey.... Dad can drive it to work, hahaha

thanks
Scott

 

Ok I will go with 24# injectors

I will be buying shorty headers as well.
The old manifolds have air lines going to them.
Can I delete these??? Since Iam getting a chip burnt.
Also I have the 9th injector I just plan on putting a plug in.
Also a 350 knock censor and doing a coolant bypass.
Also an adjustable fuel pressure reg.
I think that is about it.

What do you think??? Is that it???

thanks much scott

 

The SVO 24's is a good choice.

As for the A.I.R. lines, you can eliminate them provided you don't have any emissions checks (visual, especially) with a chip burn (or if you have an inspector buddy), but some will say that will also shorten the life of your cats. I left mine on.

The 9th injector can be eliminated, but it will take some more ECM/prom changes to address the starting issues that will probably come up.

AS for the prom changes, don't waste your $$ on a custom chip, take the local guys who offered to ehlp you out on that's offer. Long distance chip tuning never works out as well, and most will say it's a waste of money (was in my case as well).

 

Yes I will get a hold of some local people to see what can be done.
I talked with my son and he is very interested in the local club for third generations.
We will be starting to put the engine together this weekend.
He will be in the thick of it as well.
I believe it is giving he some respect for the car as well as the engine, and what it takes to to get something you want.

But I was wondering if I use the 305 runners and stuff how will it run with that cam?
Should be a bit restrictive correct? Any drivability problems?
Can it be e-promed to run half good?
I don't really want to go to far with the HP yet.
Thanks
Scott

 

With a decent prom tune it should run fine.

The intake manifold, runners, plenum, and throttle body were IDENTICAL for both the 305 and the 350 so re-using your old ones shouldn't make any difference at all.

 

What kind of horse power could I expect with the above parts and pieces?

Iam looking for 300 hp
am I close???


Do you think there will be a problem using these modified 305 heads with the .060 over 350 pistons??
thanks
scott