I was wondering which is better borring out a 305 to a 350 or buying a new 350. What are the pros and cons to each one. Or changing the stroke on the 305 to a 350.

 

You can't bore out a 305 to 4". There isn't enough metal in the block. If you want a 350, you need a 4" bore block.

Stroking a 305 only gets you 334

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Follow my racing progress on Stephen's racing page
and check out the race car

87 IROC-Z Pro ET Bracket Race Car
383 stroker (carbed) with double hump cast iron heads and pump gas
461 Big Block installed and ready for the 2001 racing season

Best results before the 383 blew up
Best ET on a time slip: 11.857 altitude corrected to 11.163
Best MPH on a time slip: 117.87 altitude corrected to 126.10
Altitude corrected rear wheel HP based on power to weight ratio: 476.5
Best 60 foot: 1.662

Racing at 3500 feet elevation but most race days it's over 5000 feet density altitude!
Member of the Calgary Drag Racing Association

87 IROC bracket car, 91 454SS daily driver, 95 Homebuilt Harley

[This message has been edited by Stephen 87 IROC (edited February 13, 2001).]

 

The 305 and 350 stroke are the same.

 

Say it somewhere else next time. Thanks!

[This message has been edited by madmax (edited March 04, 2001).]

 

You must have known every from the start, huh, johnyIROC? God forbid this guy might ask a question so that he can learn about the hobby. Why don't you lighten up?

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'89 Firebird Formula-
K&N Air Filter, Holley Throttle Body Air Foil, Hotchkis Strut Tower Brace, Hotchkis Panhard Rod, Hotchkis Trailing Arms, Kenny Brown Subframe Connectors, GT Auto Assesories aero wing

 

Hey there, fstrthnaspeedintickit... funny alias

The 305 and 350 do have the same stroke but do not have the same bore. Unfortunately, as Stephen 87 IROC pointed out, the 305 cannot be bored out enough to make a 350. Also, one of the little quirks between the 305 and 350 is that even though the stroke is the same, the crankshafts are not the same. A good resource for information that I would recommend you get is the Chevrolet Power Manual (or Performance Manual, whatever they call it). It outlines the differences between all small blocks and tells you about interchangeability of parts and so forth.

[This message has been edited by 89V6toV8 (edited March 04, 2001).]

 

If you don't ask questions you won't learn a darn thing. I am still learning and would ask any question no matter how dumb some people might think it is. I remeber when I first started getting into performance I asked a freind if I could put Big block heads on my sbc. He told me "No stupid u can't", but now I know.

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Big 454 72 Chevy Nova
383 86 Camaro Z28

 

I must appologize for my ignorant remark, I once was unenlightened myself. Just last summer I managed to fill my engine up with water. I have an '83 fiberglass hood on my car, and I decided to make the ducts functional with a drywall saw. The next day we had a monsoon, and I cracked two starter housings before I figured out what had happened. If it wasn't for the people on this board, I would have assumed the LG4 was farked over, and got my 350 along time ago

 

Its a whole helluva lot cheaper to buy a crate 350

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-John
92 RS
-L03 305
-700R4 auto.
-2.73 peg leg
-GMPP open Air Element
-Hypertech Street Runner chip
-Hypertech under drive pullies
-R&R High Flow Catalytic Converter
-Flowmaster Catback Exhaust (with NO tips)
-K&N Crankcase breather
-Kenwood CD head unit
-Kenwood 6x9 speakers in rear.