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Old 07-23-2009, 03:39 AM
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how well will this work

ok so here it is i have a sbc350 bored .040 over, i have a cam kit from comp cams (cl12-243-3), a set of 305 heads(casting number 14014416), and a holley fuel injection/w mega squirt 900 cfm. So the question is will these heads work? and i forgot to mention that these 305 heads came off a 305 bored 40 over out of a hydro plane
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Old 07-23-2009, 11:19 AM
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ok well i hope someone will respond
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Old 07-23-2009, 11:40 AM
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Quote:
Originally Posted by chevyman420
ok so here it is i have a sbc350 bored .040 over, i have a cam kit from comp cams (cl12-243-3), a set of 305 heads(casting number 14014416), and a holley fuel injection/w mega squirt 900 cfm. So the question is will these heads work? and i forgot to mention that these 305 heads came off a 305 bored 40 over out of a hydro plane
See this thread for an on going conversation about 305 heads on a 350.

another 305 head to toss around

Like Obama says "yes we can".

Bogie
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Old 07-25-2009, 11:35 AM
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So i didn't get anything from that so maybe someone can help me with my set up not someone else's. So if no one knows what i'm looking for : Will these heads work with this cam and fuel injection or not? my buddy had this cam and fuel injection with some camel humps so i know that they work but these heads have smaller valves i think. now i put a digital micrometer and they measured 1.716 in. not sure what valve that is. O and these heads may have had work i know they have guide plates which are not stock.
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Old 07-25-2009, 12:40 PM
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OK so I just need help with what I have. I have searched and read tons of other posts on this site and none of it helps me. So please someone just let me know if this will work ok and maybe how to check to see if these heads have had work done other than the guide plates.
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Old 07-25-2009, 01:02 PM
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the 305 heads don't breathe very well on the top end. Correct me if I'm wrong but don't 305 heads run out of steam around 4500-5000.

Basic Operating RPM Range 1,800-6,000. I think that you will be losing alot of hp with that cam. Only giving yourself around 3000 rpm to work with on a street motor might get old.
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Old 07-25-2009, 01:31 PM
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Quote:
Originally Posted by chevyman420
So i didn't get anything from that so maybe someone can help me with my set up not someone else's.
If the intake valves are the tiny 1.72's, forget it. These heads come stock w/1.84" intakes if they're the "good" heads. The 1.72" are junk, unless you plan on converting them to at least 1.84" or 1.94" (which is what everyone uses when modding the 416 heads, along w/porting to get them to flow enough to support a 350). Do you know how to read the tool, and where to measure the valve in the first place?

No matter what has or has not been done to the heads, all clearances have to be verified- all of them- including piston to valve, spring coil bind, retainer to guide, retainer to rocker, rocker slot, pushrod slot (which should be fully opened up if using guide plates, otherwise the p-rods will bind), etc, when using a non stock cam.

Your cam has nearly 1/2" lift on the exh. side, and like .480" on the intake. Stock springs will not work, so you need springs, or have the springs on the heads now tested to see if they'll work w/the Comp cam.

Other than the above, yeah, all your parts will work just fine.

BTW- Why you got nothing from the thread Bogie linked to is beyond me- the entire thread is concerned with the same heads you are talking about, so if you got nada out of it, you sure as hell didn't look very hard.
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Old 07-25-2009, 01:34 PM
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OK well here is a little info on what i plan to do with it. It is going into a 85 Toyota 4x4 with 3/4 ton axles(4.11s) th350/205 transfer-case(run in low range) and 35s or 38s I have both sizes and I run it in comp mud bogs and mud drags
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Old 07-25-2009, 01:37 PM
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Looks to me like your gonna need alot of low end torque with what you are doing. Find better set of heads IMO. Cole
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Old 07-25-2009, 01:41 PM
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OK the springs on the heads are dual springs. The heads actually came off a 305 hydroplane motor. I got that porting and putting bigger valves in makes them better but I don't have the funds for that so I thats why I wanted to know if they would work with my set up or not.
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Old 07-25-2009, 01:43 PM
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So would I be better off just porting my stock heads that are 76cc
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Old 07-25-2009, 01:51 PM
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The 305 heads are 58cc , if i didnt have the funds to do what really needed to be done and had a set of 76cc heads i would work them and forget about the 305 heads for now. JMO, But I would go ahead and find out what has been done to the 305s just in case, But someone else may have a better suggestion for you on here. Whats the #s on the 76cc heads you have? Cole

Last edited by eloc431962; 07-25-2009 at 02:08 PM.
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Old 07-25-2009, 02:10 PM
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OK so how can I figure out(tell) what has been done. The 76cc head #s are 3998993 and 333982 now I know they are different but they have rebuild tags on them. I looked them up on mortec and one is 76cc and the other seems to be 75cc(?). Now how hard is it to gasket match these cast heads and what kind of burring(?) tool do I need
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Old 07-25-2009, 02:12 PM
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Thanks to everyone that has taken the time to reply I appreciate the input every bit helps
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Old 07-25-2009, 04:13 PM
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Ok, here's the deal. You bought the parts before you put your plan together. Buy a book on how to hot rod chevy engines and read the THEORY behind making power. Once you understand that, you will be able to determine yourself if those parts will result in an engine that will make you happy. Not getting anything from the thread that Bogie supplied is ridiculous! Maybe it's not your engine exactly but the theory is the same. Quit being lazy and do some research. Have a nice day.
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