Advantage to 305 heads? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

cochino12 · 11-27-2004, 02:15 AM

What is the advantage of using 305 heads on a 350? I know a couple guys running that setup and was curious about the advantages/disadvantages

r0lf- · 11-27-2004, 02:54 AM

Ask them what they are smoking, because there really arent advantages. I know some LS1 guys run 5.3 heads to bump compression, but thats because of the computer.

Anybody can change some pistons and have higher compression that way on a carbed motor. 305 heads will flow a TON less than 350 heads.

MylilBowTie · 11-27-2004, 05:16 AM

I dont really see the logic in it. I understand if that's what or all your can afford (good deal on them or something). All I have ever seen people talk about is the added compression from them. But the heads dont flow all that well, it will work but dont expect anything special out of it. So all the advantages are pretty much canceled out by the negatives. The swirl port tbi heads unless worked over are not all the good either. Kind of a loaded question not knowing your intentions for the heads or application.

dons454s · 11-27-2004, 11:07 AM

they are smaller chambed but as said dont flow at all

badone07 · 11-27-2004, 11:52 AM

Depending on casting number, they can work well. I would only use the 416 or 601 castings though, if I wanted to retain the perimeter style valve covers. Plenty of info here...

http://www.thirdgen.org/techbb2/foru...?s=&forumid=13

Mike76251 · 11-27-2004, 11:52 AM

Massive shrouding due to the small bowl diameter,
cheap junk cast iron,
imported

That's why I only paid $30 for a rebuilt set off eBay a few years back........still have em' and they are not worth the shipping fee.

SanitysBane · 11-27-2004, 01:27 PM

with the cost of fast burn heads from GMPP

http://www.sdpc2000.com/catalog/3129...nder-Heads.htm

i would just get new heads personally

11-27-2004, 02:15 AM	#1
cochino12 It followed me home? Join Date: Mar 2003 Location: Yup Posts: 5,751	Advantage to 305 heads? What is the advantage of using 305 heads on a 350? I know a couple guys running that setup and was curious about the advantages/disadvantages __________________ Adam That's why they call it a shortcut Kyle, if it was easy it would just be the way. 86 c-10 SWB 85 CCSB 90 GMC K30 Crew SRW 1985 C30 Dually

11-27-2004, 02:54 AM	#2
r0lf- Hotwheels? Join Date: Dec 2002 Location: Pleasant Hill, CA Posts: 1,145	Ask them what they are smoking, because there really arent advantages. I know some LS1 guys run 5.3 heads to bump compression, but thats because of the computer. Anybody can change some pistons and have higher compression that way on a carbed motor. 305 heads will flow a TON less than 350 heads. __________________ 1978 Money Pit - CUSTOM DELUXE!!!!

11-27-2004, 05:16 AM	#3
MylilBowTie Right turn Clyde Join Date: Nov 2002 Location: Cincinnati, Ohio Posts: 2,911	I dont really see the logic in it. I understand if that's what or all your can afford (good deal on them or something). All I have ever seen people talk about is the added compression from them. But the heads dont flow all that well, it will work but dont expect anything special out of it. So all the advantages are pretty much canceled out by the negatives. The swirl port tbi heads unless worked over are not all the good either. Kind of a loaded question not knowing your intentions for the heads or application. __________________ 1974 C25 LWB: 454 4bbl Carb / TH400 / 3.73 1992 Camaro RS 305 TBI

11-27-2004, 11:52 AM	#5
badone07 Project 2 Resume Join Date: May 2004 Location: Jim Thorpe, PA Posts: 884	Depending on casting number, they can work well. I would only use the 416 or 601 castings though, if I wanted to retain the perimeter style valve covers. Plenty of info here... http://www.thirdgen.org/techbb2/foru...?s=&forumid=13 __________________ John 1984 C30 Chevy Crew Cab Dually 1998 Jeep Cherokee 4x4 2004 Chevy Trailblazer 4x4 (wife's) 1970 Mustang FB fully tubed (getting 521 BBF & powerglide) 1978 Nova 2dr (going BBCaddy & S.P. th400) 1984 Monte SS (circle track car)

11-27-2004, 01:27 PM	#7
SanitysBane Registered User Join Date: May 2004 Location: Lubbock, Texas Posts: 2,121	with the cost of fast burn heads from GMPP http://www.sdpc2000.com/catalog/3129...nder-Heads.htm i would just get new heads personally __________________ '96 Nissan Pathfinder '02 Firebird Trans Am. '88 K5 Blazer

11-27-2004, 11:07 AM	#4
dons454s Registered User Join Date: Nov 2004 Location: Claysburg, Pa Posts: 408	they are smaller chambed but as said dont flow at all

11-27-2004, 11:52 AM	#6
Mike76251 Senior Member Join Date: Mar 2003 Posts: 2,499	Massive shrouding due to the small bowl diameter, cheap junk cast iron, imported That's why I only paid $30 for a rebuilt set off eBay a few years back........still have em' and they are not worth the shipping fee.

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