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Old 07-14-2012, 09:27 PM
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another 305 question...

Hi guys..
not really a hot rod question, but need advice from people who know engines!
I recently acquired a 1963 chevy which has a 305 sitting in it. I plan on pulling it and putting a 327 in and using the 305 for my plow truck, which is an 88 chevy 305 so I figured it would be a fine replacement..
in looking up information on the 305 from the 63 I learned that is from a 1980 corvette (bonus!) my question is this: would I be better off sticking with the TBI and intake from the 88 or should I stick with the aluminum intake and Q-jet that is on the '80?
Since it is a plow truck I'm not super concerned with economy, more worried about power...my other concern is that it needs to start decent when it's very cold out (down to -40F)
I guess I'm mostly just wondering about how the flow numbers are on the intakes, and what the limitations are on the TBI system...
thanks in advance!

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Old 07-14-2012, 10:15 PM
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Quote:
Originally Posted by chevyman26 View Post
Hi guys..
not really a hot rod question, but need advice from people who know engines!
I recently acquired a 1963 chevy which has a 305 sitting in it. I plan on pulling it and putting a 327 in and using the 305 for my plow truck, which is an 88 chevy 305 so I figured it would be a fine replacement..
in looking up information on the 305 from the 63 I learned that is from a 1980 corvette (bonus!) my question is this: would I be better off sticking with the TBI and intake from the 88 or should I stick with the aluminum intake and Q-jet that is on the '80?
Since it is a plow truck I'm not super concerned with economy, more worried about power...my other concern is that it needs to start decent when it's very cold out (down to -40F)
I guess I'm mostly just wondering about how the flow numbers are on the intakes, and what the limitations are on the TBI system...
thanks in advance!
Unfortunately, that this 305 is a 'Vette engine means nothing as far as performance goes. It still has low compression and a puny little camshaft (something like 180 hp), cast pistons and crank, etc. Nothing really differentiates it from any other LG4 SBC, in other words.

Keep the TBI. The only way you're going to make any more power is by installing headers and a cam to go w/the carb and intake, and then the low end power might not be as good as it is now. And I guarantee you it won't cold start as well w/the carb as it will w/the EFI. If it needs to pull better, change to a lower rear gear ratio.

BTW, what are you plowing at -40 degrees?
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Old 07-14-2012, 10:27 PM
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305 vette

That engine might be worth something to a vette owner,small might.Not many vettes came with a 305. My 81 vette came with a 160 hp 350. With 2.7 gears and a 4 spd the car could barely get out of its own way.
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Old 07-14-2012, 11:56 PM
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Originally Posted by cobalt327 View Post
BTW, what are you plowing at -40 degrees?
ha ha, well, not usually plowing at that low, but once in a while it'll snow during the day, then a cold front moves in at night, but it's just good to have extra vehicles around that start good in case the daily driver won't start! I end up driving it to work a lot in the winter while working midnights in case it snows overnight, then I just make my plowing roundsafter work..
yeah, I saw that the 'vette 305s weren't anything real impressive, but what the hey, there were crappier ones...
As mentioned, maybe there's a vette owner that's looking for one, or there's a lot of stock car guys around that would be happy with it..
I actually just (about 15 min. ago) bought a .030 over 350 short block, freshly machined, assembled, and oiled and greased for storage for a case of Blatz (no kidding!) So I'm not too worried about the 305s anymore
So now.......how about that 88 TBI intake and up on a 350 with some decent heads?
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Old 07-15-2012, 11:43 AM
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I was going to do this exact thing a few months back. I had tracked down a "pristine" 4-bolt main CANADIAN 305 block, had bought a NOS set of forged Thompson "standard" bore 265 pistons, and had an 1178, 1969, 302 forged, crankshaft. Well, the pristine 305 block was a rusted up, worn out (huge ridge ring), and missing the main caps. The Thompson pistons were semi-finished, and NO ONE grinds pistons anymore (did find one shop that wanted $400.00 to do all eight pistons!). And, my 1178 crank was stolen out of my storage locker, along with a bunch of other stuff. Plan was to bore the 305 .014 over to standard 265 bore, use aftermarket rods, and the Thompson pistons. I thought I'd have a real stought, bottem end, 265. By the way, the "standard" Thompson pistons could actually be ground down to standard, or as far as .060 over. Needless to say, that dream died real quick. Now I've still got the #5306, 265, Power Pack heads (all new), the early dual quad setup, and a single 4 barrel setup; just nothing to put them on at the moment. Hope your dream turns out better than mine did. Butch/junior stocker.
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Old 07-17-2012, 08:15 PM
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Quote:
Originally Posted by junior stocker View Post
I was going to do this exact thing a few months back. I had tracked down a "pristine" 4-bolt main CANADIAN 305 block, had bought a NOS set of forged Thompson "standard" bore 265 pistons, and had an 1178, 1969, 302 forged, crankshaft. Well, the pristine 305 block was a rusted up, worn out (huge ridge ring), and missing the main caps. The Thompson pistons were semi-finished, and NO ONE grinds pistons anymore (did find one shop that wanted $400.00 to do all eight pistons!). And, my 1178 crank was stolen out of my storage locker, along with a bunch of other stuff. Plan was to bore the 305 .014 over to standard 265 bore, use aftermarket rods, and the Thompson pistons. I thought I'd have a real stought, bottem end, 265. By the way, the "standard" Thompson pistons could actually be ground down to standard, or as far as .060 over. Needless to say, that dream died real quick. Now I've still got the #5306, 265, Power Pack heads (all new), the early dual quad setup, and a single 4 barrel setup; just nothing to put them on at the moment. Hope your dream turns out better than mine did. Butch/junior stocker.

Oops! Too many 305 threads. This response was supposed to be to the "305 destroked to a 265 thread". And, I've been having trouble logging in.??? Butch/junior stocker.
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