Heads- 305 or 350??? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Bandit · 05-21-2002, 09:01 PM

What is the best way to tell if you have 305 or 350 heads? Is there a casting number that will give it away by the valve springs.

Longhorn Man · 05-21-2002, 09:53 PM

Yep, post that #, and we will tell you what you have.

------------------
'69 G.M.C. 350/350. Trying to clean up the left over damage from the Dope-Smokin-Old-Man
I've been dubbed the Longhorn Freak/Fanatic/Expert, I just hope I can live up to it.
FINALLY got the HORNIAC...a '70 one ton Longhorn with a Pontiac 350/350 and lots of 'personality'. Check out The Longhorn Webite.
E-mail longhornmail@yahoo.com
My name is Andy...not Randy...I'm in Ohio...Not Illinois...close enough?
Columbus Ohio

Bandit · 05-22-2002, 04:02 PM

Hi all, the casting numbers on my heads are 14014416, GM 36 and GM 33, also there is a K 22.

Are these 305 or 350 heads, I hope they are the latter of the two!

Thanks

Bandit

**1970 CST Short Wide** · 05-22-2002, 04:07 PM

80-86 305 1.84 Intake 1.5 Exhaust 58cc Chamber

Sorry

Check out www.mortec.com for more info
------------------
Steve's 70 CST
02 Burb (wifes Truck) www.picturetrail.com/70CST

[This message has been edited by 1970 CST Short Wide (edited May 22, 2002).]

Andreas · 05-22-2002, 05:32 PM

Look at it the bright way. Does your engine ping there´s an easy way out

With 58cc heads compression can creep up on you really fast.

As you probably know there are two more common sizes when it comes to combustion chambers, and those are 64cc´s (usually performance heads, such as fuelies) and 76cc´s, which are everywhere on 350 equipped vehicles from 73 and up. Some 76cc heads are of a very good casting but ppl in general doesn´t know about them, so they should be cheap

Bear in mind though that some 350 heads also can come with 1.84" intake valves.

Stay away from 624 castings. They are the lightest casting ever. I have no personal experience with them but a very knowledgeable enginebuilder/friend of me avoids them like plague.

/Andreas

------------------
Member of the secret sbc400 club :-)

Bandit · 05-22-2002, 07:33 PM

What about 327 heads, advantages/ disadvantages?

Bandit

mikep · 05-22-2002, 07:41 PM

Most 327 - 2bbl castings were very small port and they do not have accesory mounting holes plus you never know what your getting unless you get them checked and magged first. Old heads have their share of cracks and sunken valves . Don't feel bad. My dad just bought a set of 305 heads that had been opened up for larger valves and had a decent valve job done with new springs and guides etc. seems its the hot ticket for stocker rebuilds these days. With dished pistons he's got 9.3:1 compression and gobs of low end torque and thats exactly what you need in trucks like his with 3.08 gears.

[This message has been edited by mikep (edited May 22, 2002).]

Longhorn Man · 05-22-2002, 09:45 PM

Don't put those 305 heads on a 350. Trust me, i did it on the old Longhorn. They were free, and I still feel I got ripped off. Only thing I would use them for is weight in the bed on a snow day.

------------------
'69 G.M.C. 350/350. Trying to clean up the left over damage from the Dope-Smokin-Old-Man
I've been dubbed the Longhorn Freak/Fanatic/Expert, I just hope I can live up to it.
FINALLY got the HORNIAC...a '70 one ton Longhorn with a Pontiac 350/350 and lots of 'personality'. Check out The Longhorn Webite.
E-mail longhornmail@yahoo.com
My name is Andy...not Randy...I'm in Ohio...Not Illinois...close enough?
Columbus Ohio

05-21-2002, 09:01 PM	#1
Bandit Registered User Join Date: Feb 2002 Location: Saskatchewan, Canada Posts: 23	Heads- 305 or 350??? What is the best way to tell if you have 305 or 350 heads? Is there a casting number that will give it away by the valve springs.

05-22-2002, 04:07 PM	#4
1970 CST Short Wide Senior Moment Join Date: Mar 2002 Location: Pittsburg Ca Posts: 4,043	80-86 305 1.84 Intake 1.5 Exhaust 58cc Chamber Sorry Check out www.mortec.com for more info ------------------ Steve's 70 CST 02 Burb (wifes Truck) www.picturetrail.com/70CST [This message has been edited by 1970 CST Short Wide (edited May 22, 2002).] __________________ 1970 CST LS 1 6 speed Ford 9 inch Detroit Tru Track, Dakota Didgital, Vintage Air, QA1 Coil Overs Front & Rear Lots of FUN 2013 GMC PU, Oldest Son 71 GMC LWB. QA1 Suspension, Angry SB. Youngest Son 2019 GMC Diesil Dually. Youngest Son 2017 Toyota SUV Daughters car 2018 Traverse , Wife’s Ride Pittsburg Ca 94565

05-22-2002, 05:32 PM	#5
Andreas Registered User Join Date: May 2002 Location: Stockholm, Sweden Posts: 9	Look at it the bright way. Does your engine ping there´s an easy way out With 58cc heads compression can creep up on you really fast. As you probably know there are two more common sizes when it comes to combustion chambers, and those are 64cc´s (usually performance heads, such as fuelies) and 76cc´s, which are everywhere on 350 equipped vehicles from 73 and up. Some 76cc heads are of a very good casting but ppl in general doesn´t know about them, so they should be cheap Bear in mind though that some 350 heads also can come with 1.84" intake valves. Stay away from 624 castings. They are the lightest casting ever. I have no personal experience with them but a very knowledgeable enginebuilder/friend of me avoids them like plague. /Andreas ------------------ Member of the secret sbc400 club :-) __________________ Member of the secret sbc400 club :-)

05-22-2002, 07:41 PM	#7
mikep Used to have a truck Join Date: May 2002 Location: port orchard WA Posts: 1,552	Most 327 - 2bbl castings were very small port and they do not have accesory mounting holes plus you never know what your getting unless you get them checked and magged first. Old heads have their share of cracks and sunken valves . Don't feel bad. My dad just bought a set of 305 heads that had been opened up for larger valves and had a decent valve job done with new springs and guides etc. seems its the hot ticket for stocker rebuilds these days. With dished pistons he's got 9.3:1 compression and gobs of low end torque and thats exactly what you need in trucks like his with 3.08 gears. [This message has been edited by mikep (edited May 22, 2002).] __________________ No truck :-(

05-21-2002, 09:53 PM	#2
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,693	Yep, post that #, and we will tell you what you have. ------------------ '69 G.M.C. 350/350. Trying to clean up the left over damage from the Dope-Smokin-Old-Man I've been dubbed the Longhorn Freak/Fanatic/Expert, I just hope I can live up to it. FINALLY got the HORNIAC...a '70 one ton Longhorn with a Pontiac 350/350 and lots of 'personality'. Check out The Longhorn Webite. E-mail longhornmail@yahoo.com My name is Andy...not Randy...I'm in Ohio...Not Illinois...close enough? Columbus Ohio

05-22-2002, 04:02 PM	#3
Bandit Registered User Join Date: Feb 2002 Location: Saskatchewan, Canada Posts: 23	Hi all, the casting numbers on my heads are 14014416, GM 36 and GM 33, also there is a K 22. Are these 305 or 350 heads, I hope they are the latter of the two! Thanks Bandit

05-22-2002, 07:33 PM	#6
Bandit Registered User Join Date: Feb 2002 Location: Saskatchewan, Canada Posts: 23	What about 327 heads, advantages/ disadvantages? Bandit

05-22-2002, 09:45 PM	#8
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,693	Don't put those 305 heads on a 350. Trust me, i did it on the old Longhorn. They were free, and I still feel I got ripped off. Only thing I would use them for is weight in the bed on a snow day. ------------------ '69 G.M.C. 350/350. Trying to clean up the left over damage from the Dope-Smokin-Old-Man I've been dubbed the Longhorn Freak/Fanatic/Expert, I just hope I can live up to it. FINALLY got the HORNIAC...a '70 one ton Longhorn with a Pontiac 350/350 and lots of 'personality'. Check out The Longhorn Webite. E-mail longhornmail@yahoo.com My name is Andy...not Randy...I'm in Ohio...Not Illinois...close enough? Columbus Ohio



Register or Log In To remove these advertisements.

Register or Log In To remove these advertisements.