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#1 |
Registered User
Join Date: Oct 2009
Location: clovis ca.
Posts: 19
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350 heads on a 305 block
can you run 350 heads on a 305 block? if you can what are the pros and cons?
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#2 |
its all about the +6 inches
Join Date: Jan 2001
Location: Hilliard Ohio
Posts: 2,693
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Re: 350 heads on a 305 block
can't do it, the valves will hit the cylinder walls. (won't open)
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#3 |
Senior Member
![]() Join Date: Jan 2001
Location: Orem, Utah
Posts: 7,915
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Re: 350 heads on a 305 block
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#4 |
Registered User
![]() Join Date: Apr 2000
Location: Bradenton, FL
Posts: 1,036
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Re: 350 heads on a 305 block
Im running 350 heads on a 307.
__________________
1970 CST/10 402,700R4,3:73 posi,AC,PS,PB,TLT,PW,Buckets with heaters |
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#5 |
Registered User
![]() Join Date: May 2007
Location: Rapid City South Dakota
Posts: 2,359
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Re: 350 heads on a 305 block
Depends on the valve size.
305 has such a small bore size, that the large chamber head will drop the compression.
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Turp Mcspray New life for an old 2wd, farm blazer http://67-72chevytrucks.com/vboard/s...d.php?t=505987 My Blazer build http://67-72chevytrucks.com/vboard/s...d.php?t=342299 |
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#6 |
Registered User
Join Date: May 2006
Location: Jonesboro, AR
Posts: 916
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Re: 350 heads on a 305 block
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#7 |
Registered User
Join Date: Mar 2004
Location: Hoytsville, Utah
Posts: 3,365
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Re: 350 heads on a 305 block
"I got 350 heads on a 305 engine
I get ten miles to the gallon I ain't got no good intentions" What, no Drive By Truckers fans here? ![]() ![]() ![]()
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'68 Panel Project Boogie Chillin' '68 C-10 Ol' Green Last edited by pritch; 11-11-2009 at 11:18 PM. |
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#8 |
Registered User
Join Date: Nov 2005
Location: Monroe,Georgia
Posts: 313
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Re: 350 heads on a 305 block
I think they will physically fit. But the valves are so close to the cylinder wall they call it shrouding the valve. When the valve open the part that is close to the wall won't let any fuel in and vise versa for the exhaust.
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#9 |
Registered User
Join Date: Mar 2009
Location: USA
Posts: 255
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Re: 350 heads on a 305 block
I've been doing a little research on how to get a little more power from my 305. I've read some articles on swapping on some L30 "059" vortec heads (1996 - 2002 305) on an older block. It seems to be a good swap, but needs a "vortec" style intake as the intake mounting bolts are different and uses centerbolt valve covers. They also use specific rail type rocker arms and are limited to .430 max valve lift due to the retainers contacting the valve guides. Edelbrock makes a performer intake whick seems reasonably priced. They also don't have the exhaust crossover to keep the intake / carb heated in cold weather. So, I'm still on the fence on that decision.
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#10 |
Still livin the "dream" in '54
Join Date: Nov 2006
Location: Tucson, AZ
Posts: 2,656
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Re: 350 heads on a 305 block
I have heard you can run 305 heads on a 350 but not sure on the other way around...
Hmmmm. D
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Current build. 1954 Chevrolet 3800 "Ella" SOLD! My '67 stepper "Tangerine Dream" "Anything worth doing is worth doing right" James Dean “When you have eliminated all which is impossible, then whatever remains, however improbable, must be the truth.” Sherlock Holmes "There is no spoon." Neo |
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#11 |
is Certifiable
Join Date: Feb 2008
Location: Hinesville, Georgia
Posts: 160
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Re: 350 heads on a 305 block
Find out what heads you have on the motor now, see if they are anything worth using. 1.94 intakes and a 64 or 67cc chamber will be just fine for a 305. Put a decent cam in it, something with lift around .430 to .450. The smaller bore of the 305, and the smaller intake runners will limit just how well it breathes. So duration would be a little more important than lift in your case. I would guess
![]() Best bet is get as much information as you can from your vehicle. Weight, rearend gears, transmission, converter stall, exactly what the engine is (compression and so on). And call a tech line of some camshaft manufacturers. They can run the numbers and help you out. You will get some really good info from this site, and from tech support. But collect as much information as you can before you spend your hard earned money.
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1972 Chevy C10 LWB 350 Auto Blue with a white roof. Last edited by joedoozer; 11-13-2009 at 01:21 AM. |
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#12 |
Registered User
Join Date: Oct 2006
Location: Temecula,CA
Posts: 309
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Re: 350 heads on a 305 block
You are correct. I have seen it done before.
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Nick Old pic of my 72: http://img340.imageshack.us/my.php?image=img0435co5.jpg 04 Silverado Daily Driver 68 GMC short step http://67-72chevytrucks.com/vboard/s...d.php?t=379665 "I'll beat you to the gas station!!" ![]() ![]() |
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