[NorthStar]

Well then there shouldnt be any problem the 601 heads have a smaller chamber but they really shroud the intake valve. Youlll gain some air flow and give up a little compression which I think would be the right direction to go.

[smokin]

OK Il' go ahead as planed and go with the HO heads and a 040 gasket .I appreciate the second opinion.

[smokin]

Originally posted by wellcontrol
Sorry about my last post.I had a 1976 GMC
1500 pickup and a 350.The heads are 58cc
but did not have dished pistons.They are
flat top 4 relief style.Compression is about
11.5-1.Anyways no overheating or detonation
problems with mine,but who knows,maybe I got
lucky.If you are going to try this,good luck.

What thicknes head gasket did you use to get 11.5-1 compression

[rustorbust]

Ive got the (434) 305 heads on a 327 with 4 valve releif flat tops. It has the old solid 283 fuel injection cam. With a single plane edelbrock intake. I was wonedering if anyone knew what the compression was with this. I have really ran into some detonation problems lately on 91 so...... Help Please?

[highcompression]

Originally Posted by smokin

I have a 350 with flat tops and 14014416-305 HO heads that I ported and polished and a 280/480 cam also a turbo 350 trans with 308 gears so what head gasket is the right thickness for my engine and how will it run ?

well ill tell you right now. i did the exact same thing but did not port the heads...i did polish and clean them...your compression will jump up, the low end will pick up quite a bit and its going to be loud...so be careful on exhaust choices...i use dual super 40's....just draws unwanted attention and punk kids that want to race all the time...but .040 thou thick should be fine...thats what i got..fel pro gasket set they were 0.042 thick and if you had dished pistons there will be no metal on metal contact

[Hippie]

FYI this thread is 8 years old.

[highcompression]

Originally Posted by 78 monte

I put 305 heads on a 350 with dished pistons.With a mild cam ,4bbl and headers.The motor ran like a raped ape.Comp was probably around 9.5:1 w/ dished pistons.

my bad i prob failed to mention the heads were machined a bit. with the stock 305 heads the compression would be nowhere to that but when i braught the heads in prior to using them on my engine the machine shop told me that im pushing barriers on things you shouldnt do. it sounds mean as hell but does seem to run a bit hot

[highcompression]

Originally Posted by HotRodS10

Is there any advantage in putting 305 heads on a 350? I heard someone mention this one time and was just wondering. Thanks, HRS10

you will get an increase in bottom end. if you do the machine work to the head it will pan out depending on your setup. i mean they wont flow like 350 heads obviously but when i slapped a set of 305s on mine the torque i noticed now is just ungodly i can peel all 4s with no hesistation at all and its just mean.

[highcompression]

Originally Posted by smokin

I have a 350 with flat tops and 14014416-305 HO heads that I ported and polished and a 280/480 cam also a turbo 350 trans with 308 gears so what head gasket is the right thickness for my engine and how will it run ?

well i have the same heads put on my stock piston'd 350. my gasket is 42 thousandths thick. with the heads ported and polished it will run very clean and you can prob get away with running normal pump gas pretty easy. and it will run pretty good. i didnt port mine just cleaned then and polished everything up all nice nice. and with my setup i run a 2102 edelbrock cam. 600cfm 4 barrel. rpm air gap intake. and 416 305 h.o heads and it will peel the god damn tires until i let off the gas...very torque-filled and will please your right foot

[tuff82]

were im from they call that "farmer horsepower"