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Old 10-13-2013, 01:06 AM
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350 with 305 head

I have a 350 that I want to put 305 heads on how much of a difference does it make. And I am making it carberated but I cant put a mechanical fuel pump on it like the 305 has so how can I do this

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Old 10-13-2013, 02:38 AM
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Quote:
Originally Posted by cameronkoenenn93 View Post
I have a 350 that I want to put 305 heads on how much of a difference does it make. And I am making it carberated but I cant put a mechanical fuel pump on it like the 305 has so how can I do this
Search button is your friend
305 head on a 350 sbc
Sbc 350 w/ 305 heads..
305 heads put onto a 350 sbc block
305 heads or 350 heads on sbc 355
chevy 305 heads on a 350??
I need help building a 350 using 305 heads
350 sbc with 305 h.o heads will this work whats the ups and downs

That's just page one....of this site....
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Old 10-13-2013, 07:06 AM
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Which 305 heads specifically? On certain 305 heads,the small valves & flow will kill any power gain from the CR increase w/o major work & porting.
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Old 10-13-2013, 07:36 AM
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Originally Posted by jokerZ71 View Post
Which 305 heads specifically? On certain 305 heads,the small valves & flow will kill any power gain from the CR increase w/o major work & porting.
Exactly.This 305 thing being popular doesn't make any sense when you spend money on everything else and then cheap out on one of the most important things the heads.
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Old 10-13-2013, 07:44 AM
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As far as the fuel pump,you can install an inline electric pump.If you now have an intank pump,you will have to modify or change your pickup assembly & depending on which carb & pump you use,you will prolly need an adjustable fuel psi regulator (AFPR).
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Old 10-13-2013, 09:37 AM
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Quote:
Originally Posted by cameronkoenenn93 View Post
I have a 350 that I want to put 305 heads on how much of a difference does it make. And I am making it carberated but I cant put a mechanical fuel pump on it like the 305 has so how can I do this
Please tell us what it is exactly that you intend to achieve with a head swap.
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Old 10-13-2013, 02:05 PM
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And what is the casting number of the 305 heads. and what are you willing to do to make the things actually flow (more) air.
Remember in stock form a OEM 305 head has modest port flow, just like a stock low perf 350 head does.
They don't get good unless and until you port them and add larger valves.
If you only want to bolt them on keep your expectations modest. As you are just replacing one restrictive stock head with another.

#4416 305HO heads + 1.94 x 1.60 valves + full effort home brewed full generous complete porting ='s very good results.

Half baked or no effort to improve port flow and / or starting with a crappy small valve (1.72") 305 head ='s modest result.
EG: replaceing a 76cc smogger head (882, 462624, 993) with a small valve 60cc 305 head.
You gain some low mid torque 'cause of the increase in cr.
But you don't gain any horsepower.

Carter P4070 electric fuel pump. No regulator is required. 3/8" fuel line.

Last edited by F-BIRD'88; 10-13-2013 at 02:32 PM.
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Old 10-13-2013, 07:47 PM
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I put the 58cc head on the parents lesabre. The tight runner, higher compression, and small valve gave increased velocity. You could get that car to fry the tires, and be done by 4000rpm or so. That wasn't a big deal cause they shifted to second at around 4200 rpm. A 4200 redline, that's like todays diesel . I got the idea from a friend who did the same thing. Those 70's cars sucked. I mean I love them, but they were junk.
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Old 10-13-2013, 08:50 PM
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I have a pair of 601 heads that are ported and are fitted with 2.02 1.6 valves

I think they're great, but even with my xe 274h cam they don't like to be reved past 5800
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Old 10-13-2013, 08:58 PM
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I have a set of pretty heavily worked on 416's on a stock smogger 350 with a shim headgasket, small lunati cam, qjet Carb, and mid length headers to sidepipes and it goes consistant 13:20's with 411's and a TH350 in a C3.
With enough time and effort I think they are a great budget/junkyard small block choice.

You get out what you put in.
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Old 10-13-2013, 08:59 PM
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Quote:
Originally Posted by xzero117 View Post
I have a pair of 601 heads that are ported and are fitted with 2.02 1.6 valves

I think they're great, but even with my xe 274h cam they don't like to be reved past 5800
Thus the reason why I don't recomend using a 2.02" valve in these heads.
A 1.94" valve is better.
I did a set of the 4416 heads with 1.94x 1.60" valves and full porting and used to buzz it well past 7000rpm.
Of course it had a camshaft and intake manifold actually capable of makeing power and reving up there.
256-264 @.050" .537 .557" 105 solid lifter cam Holley strip dominator intake.

The 601 head needs a lot of valve deshrouding even with a 1.94" valve.
The 4416 is the best of the bunch as a starting point.

Last edited by F-BIRD'88; 10-13-2013 at 09:07 PM.
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