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seed
11-30-2006, 10:18 PM
Does Anyone Know What The Differences Are Between 305 And 350 Heads?

BigBadB2
11-30-2006, 10:30 PM
Well first the 305 heads have a very small chamber 55 or 65 and stock valve size were either 1.72 or 1.84 intake and a 1.5 exhaust valve 350 heads came in many chamber sizes from 64 to 72 and had 1.72 or 1.94 intake valves and 1.5 exhaust valves not to mention larger intake runners there I hope that helps.

kootenaycat
12-01-2006, 08:29 PM
Do you have the casting numbers? Cross reference them on mortec.com and see if they were available on both engines. My old '78 shortbox 4x4 350 had 1.72 valves where I thought it should have 1.94's. And I've seen 305's with 1.94's. With a die grinder, the intake runners and guide boss' can be opened up pretty good.

A good rule of thumb is if it came on a stock small block built between 1973 and 1987, it's probably junk! Prone to cracking, and unless you do some porting, they don't flow much over 4500rpm. Of course if you're looking for heads for a stocker then should be no prob.

If you're building a performance engine, try [15] to find some camel hump heads and use stock or flat top pistons.

BigBadB2
12-01-2006, 08:43 PM
If it's camel bumps you want I've got 4 pairs but I would waste my time putting them on any thing new for the simple fact they do not have any bolt holes on the ends, and yes I've seen people drill the end (right into the water jacket) for the alternator. The best choice would be Vortec heads they work the best with very little help from a 5 angle seat. R.H.S. has brand new castings for a few hundred dollars.:D

kootenaycat
12-01-2006, 10:42 PM
Do the Vortech heads have the middle intake holes at an angle like the TBI ones? What do you do about a carbed intake?

BigBadB2
12-01-2006, 10:57 PM
Yes, kind of the Vortec heads are in a class all their own. Professional Products, Edelbrock, and others make intake manifold to mount carbs on them and their not that expensive.

BigBadB2
12-01-2006, 11:10 PM
http://www.professional-products.com/images/manifolds/52027.jpg
CROSSWIND Vortec
Small Block Chevy V8 Vortec

pumpkin
12-02-2006, 12:12 AM
Vortec heads are a great way to go, but you have to know what compresion you want. They have small chambers that will put a low compresion 350 mor 400 in the 9.5 to 10 to one compresion ratio range. What engine are you working with?

seed
12-02-2006, 08:34 AM
thanks alot for your help guys. how about intake manifolds. will a 350 intake bolt up to 305 heads and viseversa?

m j
12-02-2006, 10:24 AM
you keep asking questions that seem to suggest that you think there was only one 350 head and only one 305 head.
there were hundreds of different 350 heads offered and quite a few 305 heads offered.
you need to state what you have if you want any reasonably accurate answers here.

kootenaycat
12-02-2006, 11:27 PM
thanks alot for your help guys. how about intake manifolds. will a 350 intake bolt up to 305 heads and viseversa?

Just about any carbed SBC will swap parts with each other. Exceptions are 400 heads and I believe it's the steam holes? Someone back me on this!

That's the cool thing that Ford guys hate about SBC's. Cheap available parts that interchange with anything from 283 to 400. And you can stroke a 350 to well over 400 (430?) !!! [36] Way cheaper and more reliable then a small block Ford.

m j
12-03-2006, 12:00 AM
Ford guy here, interchangability has nothing to do with why we hate chevys.
very few things interchange as easily as you are claiming.
cheaper? yes. more reliable? you wish.

kootenaycat
12-03-2006, 09:57 PM
Ford guy here, interchangability has nothing to do with why we hate chevys.
very few things interchange as easily as you are claiming.
cheaper? yes. more reliable? you wish.

Reliable, oh yah! My brother in law who is almost 50 has been (and still is) a die hard Ford guy all his life, and admits that the SBC has a stronger bottom end and a even a stock head will flow better then a stock Ford. He is just stubborn and likes to build fast Fords! :D

Check out his Tiger, 500+ HP 337stroker, naturaly aspirated, NO Nos. And turn up the sound, it's the best part!
http://video.google.ca/videoplay?docid=-4433567055314689246

m j
12-03-2006, 11:08 PM
not sure why he thinks a sbc is stronger then a windsor or a cleveland
the cleveland head flow makes chevys cry

tigers are flat out sick little beasts

BigBadB2
12-04-2006, 10:04 PM
Just about any carbed SBC will swap parts with each other. Exceptions are 400 heads and I believe it's the steam holes? Someone back me on this!

That's the cool thing that Ford guys hate about SBC's. Cheap available parts that interchange with anything from 283 to 400. And you can stroke a 350 to well over 400 (430?) !!! [36] Way cheaper and more reliable then a small block Ford.

All SBC heads and all aftermarket heads can be turned into 400 heads by simply drilling the stem holes on an angle of course.....(454 small block bigest one I've seen)

m j
12-05-2006, 07:45 PM
here is a 460" small block ford crate engine for the street. 4.155" x 4.250" bore/stroke (http://www.worldcastings.com/prods_pages/102075.htm)

BeerBaron Sr.
12-05-2006, 08:00 PM
Ford guy here, interchangability has nothing to do with why we hate chevys.
very few things interchange as easily as you are claiming.
cheaper? yes. more reliable? you wish.

WHY DO YOU FORD GUYS "HATE" CHEVY'S SO MUCH[f][15]
OOOOOhhh , everybody hates getting BEAT, I understand Know[15]

BeerBaron Sr.
12-05-2006, 08:11 PM
here is a 460" small block ford crate engine for the street. 4.155" x 4.250" bore/stroke (http://www.worldcastings.com/prods_pages/102075.htm)
And the reason for this is ????????
Check out the 454 in Chev Small Block ??????????????
The guy wants a good running motor for his truck,he is"nt asking about
what make[27]

BeerBaron Sr.
12-05-2006, 08:28 PM
There are hundreds of heads made over the years,you have to decide what
you want out of the motor. Power in the bottom end , or top end ,hev made
parts for all occations . If you don"t want to spend the time serching for the
right GM parts,look at packages like Edelbrock make , they can match what your looking for {performance wise] GOOD LUCK
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