I'd take a 307 over a 305 any day. Better bore / stroke ratio (3.875" × 3.25" vs. 3.736"× 3.48") plus they have high nickel blocks. Take the heads off a 305 H.O. and put them on a 307.
Any money spent on a 307 could also be spent on a 350. Since 350s are so common, the pistons are a stock item in the aftermarket and are cheaper than the specialty smaller 283/307 pistons.
307s came out for 1968 and as such carry the larger journals on the crank & rods, so the cranks are actually the late 327 large journal items.
The 307 light duty truck engine really is the same as the passenger car engine. They were produced 1968 through 1973. There was also a medium duty truck version produced for 1968 only, for series 40 Chevrolets & series 940 Canadian GMCs.
"I'd take a 307 over a 305 any day". I couldn't agree more. I've had both, and the 307s had way more power and torque than any of the 305s I owned.
I still prefer 327 vs 350. Don't ask me why, I just am that way. Probably the same reason I have always thought 454's were good donors to make 427's out of.
Yes, I know you make the easiest, most power with the biggest displacement but for some reason, I like to take the biggest bore but the shortest stroke for each category.
Since I already stepped into the fire, I might as well say the first thing I thought of when the 307 discussion started was "buy it, put the crank in a 350 block and make a 327!"
You just need to try an L79 cam in a 10.25:1 compression 350 and then you would be all
"I'd take a 307 over a 305 any day". I couldn't agree more. I've had both, and the 307s had way more power and torque than any of the 305s I owned.
Then obviously you have never owned or driven an L69. Hot Rod Magazine named the L69 305 one of the Top Ten Cheverolet performance engines of all time.
If the engine was complete as pictured, it would have been bought by now I'm sure.
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Prince Edward Island
'64 Parisienne CS "barn find" - last on the road in '86 ... Owner Protection Plan booklet, original paint, original near-mint aqua interior, original aqua GM floor mats, original 283, factory posi, and original rust.
Getting the accessories on an engine is a huge bonus, most of the time these are taken off and used on the replacement engine being used. Finding the proper brackets can be a time consuming and costly endeavour as well. I am sure you can find a salvage yard L31 Vortec 350 or LO5 350 with all of the accessories ready to drop in. Both of these engines offer in excess of 300 ft-lb of torque. The votec is found in GMC and Chevy trucks & Suburbans from 1996-2000 and the LO5 was widely used in trucks and big cars, such as the Roadmaster and Fleetwood and as the Police engine in the old square body Caprices and bubbles up to '93.
I still prefer 327 vs 350. Don't ask me why, I just am that way. Probably the same reason I have always thought 454's were good donors to make 427's out of.
Yes, I know you make the easiest, most power with the biggest displacement but for some reason, I like to take the biggest bore but the shortest stroke for each category.
Since I already stepped into the fire, I might as well say the first thing I thought of when the 307 discussion started was "buy it, put the crank in a 350 block and make a 327!"
ya got me thinking. i've already made a 427 out of a virgin 4 bolt 454 block i had. now i'm thinkin that the spare 4 bolt 350 block that i have laying around needs a 307 crank. what else do i need. will the 350 connecting rods work?
'64 Parisienne CS "barn find" - last on the road in '86 ... Owner Protection Plan booklet, original paint, original near-mint aqua interior, original aqua GM floor mats, original 283, factory posi, and original rust.
I still prefer 327 vs 350. Don't ask me why, I just am that way. Probably the same reason I have always thought 454's were good donors to make 427's out of.
Yes, I know you make the easiest, most power with the biggest displacement but for some reason, I like to take the biggest bore but the shortest stroke for each category.
Since I already stepped into the fire, I might as well say the first thing I thought of when the 307 discussion started was "buy it, put the crank in a 350 block and make a 327!"
ya got me thinking. i've already made a 427 out of a virgin 4 bolt 454 block i had. now i'm thinkin that the spare 4 bolt 350 block that i have laying around needs a 307 crank. what else do i need. will the 350 connecting rods work?
Just acquired what i thought was a fresh 350 with a cracked block from improper storage. when i opened it up the numbers came up as a medium journal (3941174) 307/327 crank and (3917291) 202 heads. looks like that unmolested 69 350 4 bolt main block i acquired last month is going to become a 327 destined for the 55
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