Ok, lets have the straight dop on 305 heads - Hot Rod Forum : Hotrodders Bulletin Board
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Old 08-22-2002, 08:01 PM
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Post Ok, lets have the straight dop on 305 heads

i've done the search thing and it seems its about75% bad 25% good on using 305 heads on a 350. i'm planning a build up for my work truck beater and occational wheeler (76 chev, 4x4, 3/4 ton) and have some 58cc 305 heads. don't plan to run over 5 grand often so wouldn't these be good for a little increase in comp. and some nice low end torque. thinking of using a 214/224 SSI cam and a performer or torker mani. everything else will be pretty much stock.

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Old 08-22-2002, 08:22 PM
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The strait dope,well its good green.Anyway 305 heads w/ that cam and performer.For a torquey rev to 5k or less,street motor it'll be great. I've had good luck.I'd recomend it,especially if there the 1.84valve heads.Cheap compression.
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Old 08-22-2002, 09:07 PM
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Just make sure they are 4-barrel heads,the 2-barrel heads have some water jackets missing & can create hot spots on your pistons & burn holes in them.Believe me I know,cost me a good engine in a dirt tracker of my buddies.

[ August 22, 2002: Message edited by: wildcard ]</p>
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Old 08-23-2002, 05:05 AM
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Question

As long as we're talking 305, (the mini-me of the 350) what happens if you do the reverse, put 350 heads on a 305? What C.i. would it be with the 77cc heads and what would the result be in terms of performance? Poor low end, good long end???? Just curious.

Also, what's the difference in the 307 and 305?
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Old 08-23-2002, 05:38 AM
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The adding cc to the combustion chamber of the head will not yeild more cubic inches. Most likely it would kill the low end and compression, therefore killing the motor's performance throughout.

As to the difference btw the 307 and 305....dunno.
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Old 08-23-2002, 09:24 AM
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to answer 1st question, do it.
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Old 08-23-2002, 01:39 PM
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The 307 is a 283 bore (3.875") with a 327 crank (3.25"). The 305 is a small 3.75" bore (I think) with a stroke equal to the 350 (3.48").
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Old 08-23-2002, 02:30 PM
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so as far as my short block goes, i'd just build it up with stock compression pistons? stock being around 8.5. from there the 305 heads take you up to a little over 9 correct???
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Old 08-23-2002, 05:47 PM
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COCHEV,with stock dished you'll have around 9.5:1 My motor in my car right now has 350 w/ dished pistons,305 heads w/ 1.84s,and the same cam Clevite #S2051.W/ 3.42s and 2200-2600stall the car runs like a raped ape till about 4500 drops a little and dies at 5200.I'm asuming I'm in the 13.90-14.20 range,judgeing by others opinions and cars I've beaten.For street I think you'll be impressed if your short block is in good shape.
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Old 08-25-2002, 07:36 PM
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I have a pair of the 305 H.0 Heads that I am putting on my engine I'm building.

They were redone, 1.94/1.50, 170cc intake runners, 58cc, 3 angle valve job, new springs 510 lift, new stainless valves, the chambers have been unshrouded, etc.......


Personally I think as long as I keep the engine nice and cool it should do just fine. Im gonna have really high compression though, but I will be running racing fuel to compensate for it. (Pinging, knocking, detonation)

Hopefully in about 3 weeks or so I will have it running then maybe I can shed some light on this subject
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