305 heads

[george83]

can you put 305 heads casting number 14014416 on a 350 block. are these a bolt on, what head gasket do you need to use. the block is a stock 350 crate 290 horse. any help would be welcomed.

[jrws6]

what kind of crate motor do you have? are these 305 heads worked over and upgraded? IMO i would rahter have at least a set of vortec heads than a regular set of 305 heads. 305 heads will require some work to get close to the flow rate of the stock vortecs.your 305 heads were used on 80-84 models. 305 heads will bump comp ratio up to get more power which may require 93 octane and up. also the best part of that crate motor is not having to mess with it. just my 2 cents. dont get me wrong your combo should be moderately strong, i am just throwing you some ideas.

[george83]

These is not a complete crate motor. Short block I know that these heads are 58cc. But I\'m not building a race motor. Just a good strong street motor. All I was asking was If these heads would fit and what head gaskets to use. thanks

[Knanthrup]

They will fit. You can use regular 350 head gasket

[george83]

Thanks Knanthrup

[racer1182]

I had the exact same heads on my 327 when I first built it and it ran pretty good. Chevy_kid69 has them on his 350 right now and his truck runs good....they are not bad and you can run it on regular unleaded gas cause I did mine. Hope this helps..Greg

[george83]

Thanks Greg. When your on a slim buget, chevy makes some good low dollar parts that run real nice when combined with the right parts. Hey what intake and carb is chevy kid 69 running with these heads.

[ZR1BLAZER]

On 2005-04-06 08:45, george83 wrote:

I know that these heads are 58cc.



just out of curiosity, what year 305 are the heads from? because not all 305 heads are 58cc. only the late 80s early 90s with the H.O. motor had 58cc heads. im not sure about the trucks and all other 305s of those years but anything older then that most likely will be 76cc.

[george83]

More-tech casting ID chart says 1986 with 1.85 intake and 1.5 exh. with 58cc chamber

[george83]

Sorry that MORTEC and its 1980-1986 with 1.84 intake and 1.5 exhaust 58cc chamber and is chevy casting# 14014416

[ZR1BLAZER]

yah i just looked at that to see for myself. the 305 heads will be sweet for making some low end torque. and give you some real good throttle response. too bad your not closer i have a set of H.O. heads for an 87 305 with 58cc and 1.94/1.50 valves i would give you. little bit bigger valves would free up a little more upper rpm hp. BUT what no one has asked is what is the comp ratio of the piston you put in the 350? if they are cast stock replacements what year motor is it so you will know what the comp ratio is. what i am saying is if the stock ratio was 9.5:1 with 76cc heads from the factory you will drive the comp way up with 58cc heads? just something to think about.

[Knanthrup]

Those are some fairly small valves there. Here\'s my take on them just by the numbers given. Those heads will give you great compression being 58cc. What compression are your pistons rated at? Or, what compression was the engine originally rated at?



The valves are on the small side and flow probably won\'t be the greatest for top end performance, but you will get some great low end power and awesome throttle response from those heads. Is the rest of the engine stock? What cam are you running? What is your goal for the engine... is it just a fun driver, tower, track truck, etc?



If you want just a great daily driver street truck or something to haul and tow with, I\'d say combine those heads with an RV or offroad cam and a 600cfm holley carb and you\'ve got yourself a solid driver with pretty decent economy.

[george83]

This 350 is a crate motor 350 I whould guess 290 horse. A friend of mine bought new pulled the and sold me the short block. I think these motors are somewhere around 8.5-1 or 9.0-1 It still has the stock cam it came with. I was planning on just leaveing it in there. What do you think, should I bump up on cam size.

[ZR1BLAZER]

if it is GMs\' stock replacement create engine then yes the 305 heads will be fine. as far as the cam?? thats a call you will need to make. like Knanthrup said (what is the truck going to be used for?) if its just a daily driver and just something to play around with keep what you have. JMO. if you want to get a little more then swap in a mild RV cam?? i think if your just going to use it as a daily driver you will enjoy it just as it is. a good dual plain intake with a 600cfm carb and those heads and you will snap your neck on the bottom end and still get decent fuel milage out of it. i put the same create engine in a full size 87 chevy truck with a new TH350 and stock open 3.08 rear and it screams. nothing special just fun to drive and still serves a purpose.

[george83]

Sounds like these combo should work just fine in mi 83 s10. I will also be installing a 5speed. These is just a fun truck whose only purpose is make weekend runs with the rest of the guy,and cruise the main drag.

[racer1182]

Chevy_kid69 has a stock alluminum intake with a 600 carb........runs pretty good...he has a decent little cam in it too and it screams for a long box and these haeds of mine I had the 1.94 intakes put in them...all they do when doin that is grind the seat out a little more and they fit right in. hope this helps.........should see about the 1.94 valves.....would be a cheap upgrade if you can afford it........Greg

[MARKYMARK]

if you can use the stock hyd. roller cam that those heads came from. you will feel way more torque and not dei off so huge on top end

[ZR1BLAZER]

his heads came from an early 80s 305. non roller motor.