10-06-2006, 02:30 AM | #1 |
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Finally got my engine
So I finally got my engine back. I didn't really specify what I wanted in the engine, I just sorta said gimme an engine that works to the guy. I gave him a 305 apparently, which he got a 350 core for but kept the 305 heads. What kind of hp can I get out of this? How about reliability? This is a low buck daily driver so there really isnt a need for performance, but I would still like a quick lil truck. Also, I bought an edelbrock carb, flexplate, fuel pump, distributer, and some other stuff from summit racing. I have everything to put the tranny and engine together and drop em in. YAY. Stuff is finally getting done, but slowly.
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10-06-2006, 11:08 AM | #2 |
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Re: Finally got my engine
So what did you wind up with, a 305 or a 350?
Last edited by Ole Blue 68; 10-06-2006 at 11:08 AM. |
10-06-2006, 11:16 AM | #3 |
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Re: Finally got my engine
I'm not too good with motors.... but aren't 305 heads essentially 350 heads? The only real difference is with the piston bore in the blocks?
In terms of 350 vs 305 if you want a "quick little truck" you'll be much happier with the throttle response from the "350." I had an 86 Z28 camaro with a 305 (kinda funny, huh?) and my old heavy truck with a 350 could smoke the camaro....kinda sad actually....
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10-06-2006, 05:43 PM | #4 |
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Re: Finally got my engine
IMHO you really need to find out what CR and what cam you got - the only way to get the right components together is to know what you got from the builder. They should be able to provide the head cc, CR and the cam card. Without that, it's just guessing...
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10-06-2006, 06:06 PM | #5 |
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Re: Finally got my engine
I think the 305 heads have a smaller chamber = more compression.
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10-06-2006, 08:57 PM | #6 |
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Re: Finally got my engine
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10-06-2006, 09:06 PM | #7 |
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Re: Finally got my engine
Yes and no, the 305 head has a smaller cc combustion chamber.
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68 lwb to swb Cummins swap in the works. I promise it will be cool someday. Last edited by 68GenIII; 10-06-2006 at 09:07 PM. |
10-06-2006, 09:46 PM | #8 |
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Re: Finally got my engine
I think stock 305 heads have smaller valves too. I think it was a bore clearance issue.
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10-06-2006, 09:55 PM | #9 |
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Re: Finally got my engine
yup smaller valves , they will do ok to get around i guess dont expect magic numbers , the increase from 305 to 350 will give you a kick in the pants driving off but it will run out of air at higher revs .
if you safed some cash for the next stage go pull some used vortec heads and intake in some wreckingyard there the best flowing stock heads for the smallblock around at the moment
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i got a job again and having fun at it too idea's for the trucks and the order of things to do are taking shape and get closer to being realized , a few more months and i be able to start building for real i complete 2 of the trucks intoo running fashion one custom and one basicly stock the thirth will be sacrificed for parts Last edited by watahyahknow; 10-06-2006 at 09:57 PM. |
10-06-2006, 10:35 PM | #10 |
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Re: Finally got my engine
hey watahyahknow that's pretty much the same advice i got from my buddies. Since I didn't know a single thing about engines i just said "ooh 350", never realizing the heads did matter. I will definately get vortec heads as soon as I finish the truck and save up some more, for now it will get me around though. Thanks for the info!
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10-06-2006, 10:53 PM | #11 |
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Re: Finally got my engine
I guess I don't understand why the builder used the 305 heads and not the 350 heads. Look for some open chamber heads, like on the 400 and have the intake valves punched out, put in a cam with some lift and a good ignition and headers and look out!!!!! With time you probably will be looking to swap heads I would think.
I have some of the old "fuelie" or "hump back" heads on a 350 and even though they aren't the big valve intake heads , like a Corvette Head, they are higher compression because of smaller chamber , like from a 327, and run real well on the 350 with a stock piston. |
10-06-2006, 11:27 PM | #12 |
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Re: Finally got my engine
Maybe I'm misundestanding your point, but without knowing the specific setup making a head change isn't a great idea. Typical 305 heads are 60cc, vs 350 heads of 64cc, 70cc, 76cc, etc.
As an example, if the engine was set up with 76cc heads with -4cc pistons for 9.5 CR , a change to a 305 head would give 11.4 CR...which isn't possible in a Gen I on pump gas. Yes, you get more compression...more than is streetable. Vortechs are 64cc; a +4 cc change = ~-.5 CR. Vortechs require an intake change as well. Best heads for the $$$, and the best deal in the universe "Camel Back" or "Double Hump" heads were available in both 64cc (1970 and earlier) and 76 cc (1971 and later) chamber sizes. If the engine was set up for 9.5 CR with a 60 cc chamber, a 76cc chamber would give 8.1...yech. Definitely agree that they're not bad heads for <= .500 lift; Chevy still carries them brand new w/64 cc chambers under P/N 88958692 :-D Suggestion is to post the casting numbers and let's see what you've got...but I would still get a full build sheet from your builder otherwise you'll play guessing games every time you want to upgrade. Last edited by Billla; 10-06-2006 at 11:28 PM. |
10-06-2006, 11:45 PM | #13 |
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Re: Finally got my engine
64cc for what I've got.
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10-06-2006, 11:47 PM | #14 |
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Re: Finally got my engine
..................on the 350
76cc 400 heads with punched out 2.02 intakes on a 383 with roller valve train/ cam headers MSD ignition etc.etc. ( new engine and retire the 350 for some future project) |
10-07-2006, 09:10 AM | #15 | |
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Re: Finally got my engine
Quote:
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10-07-2006, 12:01 PM | #16 | |
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Re: Finally got my engine
Quote:
Etg, let's see the casting numbers! :-) |
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10-07-2006, 04:18 PM | #17 |
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Re: Finally got my engine
Sometimes budget guys will use the 305 head on a stock 350 to boost the CR if you're running a stock eco cam, just to get some more spunk out of the engine. An older 350 with a stock cam isn't ever going to see higher RPMs anyway, and the CR is low to start. What, 8:1? Anyway, they did it for better power despite the valves being smaller and max flow being reduced.
Better off, by far, with a new set of heads. That is, if you want to make real power.
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