has anyone installed heads with larger 1.6" exhaust valves on a stock bore 305? Not concerned with any potential "shrouding" just wether its will physically clear the bore.

 

not sure . But I have also read on here ...that you can use a 74 cc head if they won;t clear . But it's hearsay .

 

They may fit, but because of the tiny bore, the 1.5" valve will breathe better. Same deal with 1.94 and 2.02 intake valves... the 2.02 might fit, but the 1.94 will breathe better. Too close to the cylinder walls.

 

Don't know if this helps but the 2.02/1.6 combo would be awful tight. If it would fit at all.

 

I can state for a fact that the old 2.02/1.60 "camel hump" heads' valves hit on a 305, I would assume any 2.02/1.60 head would

 

The aluminum 113 vette heads with stock valves and 58cc chamber is very popular with the 305 bunch. I bought a set for a stock LB9 and they work great.

 

IIRC someone had a pic looking up the bore of a 305 at some 113s. Not sure if they were stock size valves or not. :shrug:

 

I've always heard that if you kept the stock size 350 valves, there would not be a problem.

 

None at all... I have 350 valves on my 601 heads and they work just fine.

 

what valves are we talking about here....the stock valves on most 350 heads are 1.94/1.50 with the possible exception of the corvette (I don't even think it received them since the early 70's...I have to look that up...)GM hasn't put 2.02/1.60 valves in ANY car since the late 60's early 70's the 1.94/1.50 heads will mechanically work but have shrouding problems on a 305.

 

ok....just looked it up....GM hasn't put ANY 2.02/1.60 valve heads on ANY production car(including the 'vette) since 1975 due to smog (this dose not include gen II and III engines...I'm sure someone will bring that up), they still sold them over the counter and still do.

 

Wow, getting a lot of exactly what I'm not looking for.
If you haven't actually build such a combo, please don't post.
Not looking for "i think", or I heard" or GM did this or that in the 60's.
These are "416" 305 heads (tighter valve C/L spacing than 350 heads) with 1.94-1.60" valves going on a stock bore 305 with a mild cam
.447"/.442" peak lift) The exhaust valve is the issue. At what valve lift will it contact the stock cylinder bore edge?

 

Wow, giving out a lot of a pissy attitude. Why not install the damn things and then come enlighten all of us ignorant peasants instead of coming on and insinuating how dumb we are.

OR

Take what I offered and spend some time with the search function and find the damn pic and thread and see what that person had to say.

BUT

We'll just o as you asked...

Yes. Happy now?

 

Fbird is the one making the post here, as far as I know he's the one with the most experience porting 305 heads.
I thought YOU of all people F-bird, have done this the most.

 

Have only installed them on 350's. This actually going to be the first 305 motor I've messed with.