Hey guys im getting some Iron Lightning heads 64cc 200CC heads for my 305. The problem is that I can get them with 2.08 1.6 valves. I wanted to know if this will cause problems. I know 2.02 1.6s will fit the 305. I only have .450 lift now and dont intend on going any higher. Shrouding sholdnt be too bad since i have a blower forcing air in. and i willput this setup on a 350 later on.

This is going to have a B&M Roots blower on top so im hopping the 200cc velocity drop wont be bad since the supercharger does my breathing for the engine.

My desktop dyno shows 450hp on the 305 at 5500rpms and 500hp at 6500rpms. Now i wont ever exeed 5500rpms im not confortable with 500hp on a stock bottom end, im thinking of detuning the supercharger to drop some of that horsepower. These heads flow really nasty, so im really happy

So what do you guys think about the valve size and overall setup!

Thanks for your time guys

 

I do not even think 2.02 valves will clear the cylinder walls of a 305. I think 2.00 is the max, maybe some others can correct me if I am wrong.

 

The 305 problem is far worse than mere shrouding. The intake valve will probably hit the top of the block, because the bore is smaller than the area needed to fit the valves. Bad idea.

If you're using a blower, you don't need big intake anything.... the blower takes care of all that. That's sort of the point in using a blower in the first place.

 

Put it this way......

Edelbrock states on their website that using 2.02/1.60 should not be used on a 305 with more than .450" of lift.

I don't know about 2.08 though. That's only .02" closer to the cylinder wall, but that could make a HUGE difference.

It's risky business.

 

Ok im going with the 2.02 1.6 valves, I do happen to have a .450 lift cam exactly. It was just the same price for me to get the 2.08. And its just cool to tell people you have 2.08 when they try and impress you with their 2.02 valves

Does anyone here have 2.02 1.6 valves with their 305?

What do you guys think she will run. Will the engine hold. I will be conservative with timing. Oh yeah and the engine will be fed by a variable ventury 930 cfm carburetor!

 

From what I've heard a 2.02/1.60 valve will not work with a 305 i read that in one of hot rods tech questions or in one of those tech sections.

Kyle

 

Before you actually assemble it, you might want to use a head gasket to measure that those valves will be inside the bore, not hanging over the deck of the block.

I have 1.94/1.6 in my 305.

Yes, I remember the Predator carb quite well. I didn't know they still made it.

It's impossible to guess how long it will survive built that way. If you just take a stock crank and a bunch of stock 305 rods and slp it together, it probably won't last long. If you are spending money on some heavier-duty components, the cheapest horsepower you can buy is 45 more cubes for about $50.

 

I knew somebody would say add 45cid. HEHEHE

strenght from a stock 305 to a STOCK 350 is the same. So i rephrase will a stock 350/305 shortblock handle it? Crap I know the answer I just want some words of encouragement.

I bow she will run deep into the 12s. She is runnin low-mid 14s now! STOCK TBI HEADS. MUAHAHAHHAAHAHA

 

Yup, strength is the same. Improvement needs would be the same. Money's the same. You can spend your $$$$ and have one thing, or spend the same money and get 15% more. Hmmmm...... let me consult with my financial planner on the wisdom of getting 15% extra for the same money..... tough call, that. I'm struggling. Can't figure out if it's a good idea or not.

A stock short block might "handle" it a few times. Then again, it might "handle" it for years. Or it might grenade the first time you light it up. At the very least, put some decent rod bolts in it; your odds will greatly improve.

 

Well this is the situation I had a whole rotating 385 assembly and block and all and sold the rotating assembly with the vortec heads kept the block.

Soo with that money (vortec,assembly) I bought the SC and now im going to get some good heads. I know the engine wont last years but damn it I want power now. HEHE

All of this will go to the 350 in about a year or so with forged slugers and arp rod bolt rods and nodular crank.


I was just wondering from personal experience if i stay out of detonation cut back timing and richen her up enough if the rotating assembly will be ok for around a year or so. (not daily driver) every weekend street bruiser though.

And yes the 305 to 350 debate rages on. I pick the 350 for economic reasons but there is a replacement for displacement ROOTS BLOWER. hehe They are both just as strong (305,350) Just never pushed a stock one like that before.

I spin mine to 6500rpm all the time and she is still running incredibly strong.

Thanks again guys for your input, any other thoughts are welcome. Wait I still dont know if the 2.02 1.6 valves fit!???!!?

 

You have more to worry about than just the valve diameter. I doubt anybody can tell you whether it will fit, except if somebody already has the exact same combo as you. That sort of thing is different for every kind of head. Different heads put the valves in slightly different places. If a head has the capability of accepting those valves, you can be certain that the valve location isn't stock; specifically, they're farther apart by at least .030", and maybe by as much as .050". Which of course just increases the likelihood that they won't fit.

If I was you I'd sure get a head gasket and use it as a guage to see if the valves are actually inside the cylinders and not outside them over the deck.

 

Just run the blower with the stock heads, it will make up for their crappy flow.
I have a set of the Pro Lightning heads sitting on my bench right now, 2.02's, I will go see what kind of a measurement I can get.

 

that is a pic of a 2.02 vlave sitting in an Lb9 chamber, notice how the valve doesnt fit into the chamber. The chamber is about the same size as a 305's bore so a larger valve will not fit with out notching the top of the bore.

 

there are a few people on here running 2.02 valves on 305's

NJSPEEDER is one of them

i HEARD (from credible sources) that it can be done, but you have to limit your lift...........

 

Ok so understand this, to use the benifit of a 2.02 valve you should be turning over 5500 RPM, below that a 1.94 valve will have better flow. Not that the size of the valve plays into it but the size of the bowl reducing velocity coming into the cylinder is hurt. Now this info is regarding 350 heads, its even worse for use on a 305 because the smaller bore and and filling needs.


there also quite a few people in here that have dumped a crapfull of money into there engines and manage to run mid 14's, so just cause so and so did it doesnt make it right.

 

i know no need to get bent

just saying i know it has been done

how and why? that i dont know

 

my dad ran a 305 in the mid 14's all with stock heads (no porting) crane blue racer cam, holley 600 vs and a holley street dominator intake, headmen headers and dynomax catback, not to mention we ran a powerglide and 2:73's! (not the best startingline ratio if you ask me!) you don't have to spend LOTS of money to build a motor right. the shortblock was all stock and had well over 130,XXX on it.

 

how is that relevant to the discussion at hand?

 

THAT'S HOW all i was saying was that you don't have to dump a HUGE amount of money into a 305 to get it to run well, and had he put a 700r4 with 3:73's, that setup woulda gone well into the 13's.

 

well, there are alot of variables you failed to mention about your fathers 305

most restrictive parts on a 305 are the manifolds (exhaust and intake) and the camshafts stabbed into them from the factory

the 305 is a decent street engine

let me rephrase that

the 305 can be a decent street engine after changing the cam and the manifolds

will a 350 make more power? of course
will a 350 give you more bang for the buck in the long run? of course

the heads on 305s werent that bad, they actually flowed near the same as L98 heads

(except for the TBI L03 heads, which are an atrocity)

 

well, i see your point, that is why i built my 350 instead of putting his old setup back together, as he has since built a 355. i was merely stating that you can get what you have to run respectively without tons of money. what other variables would you be referring to? the heads were unported 416's

 

rjmcgee I would really apreciate your efforts to help me. THANKS

I think 305s are good engine definatly. Build them up and when their sould dies then swap the good parts to the 350 whats the problem with this. Seems like a simple solution.

I would invest money on the 305 and when i mean invest i mean going into the short block and beefing it up would be if i were supercharging it. From my experience when you go blown CI doesnt matter much. I SAID MUCH! anyways.... And you can say you have a 305. just kidding

Does anyone beside me get low 14s with the stock l03 heads still on?

Oh yeah does anyone have some good flowing used heads for sale????

 

traction, vehicle weight......etc

saying a 305 runs 14's doesnt tell me much about what kinda of power its actually making

putting a 305 into a gunboat caprice, you'll see 17's

putting that same 305 into a sprint car, you may see 13's

 

Sprint cars weigh around 2,500-2,800 lbs.

Seen a 305 tpi Fiero (yes, v8 in a fiero) run 13's in stock form.

 

ok, so i was a little off

but you get the idea

 

 

Sprint cars weigh how much.I think you better look that one up buddy.

 

That statement contradicts itself; '305 TPI Fiero' and 'stock form'?!


Figures that I have the worst possible combo: LO3, 700-R4, and 2.73s.

 

Ok, here is a decent shot of 2.02's. They are Pro Lightning's 200cc, 64 cc chamber. Hope this helps.

 

if i am reading that dial caliper correctly, it says 3.335"

 

i think he meant the 305 was all stock............

dont feel bad, at least you have potential for something great

thats alot more than most people can say

 

Time for stronger glasses.

3.735

 

please excuse my stupidity

i should have realized

1.6+2.02= helluva lot more than 3.335"

 

Here's something to think about.

When I was in high school, our race team mocked up a 0.030" over 305 with a set of Trick Flow 64cc 23* heads on a bare block. We played with some cams and estimated that interference will occur near .600" of lift. Now I wouldn't take the information to heart, but it's a good bet.

 

car was in stock trim, base model z28, with the exceptions of a jegs torque arm (which sucked! we got a spohn now) and hotchkis lca's and panhard rod, running bfg drag radials (235's). oh, and he had jegs bolt in subframe connectors.