thanks

Paul

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1987 Trans AM
305 LG4 5.0L
WS6
700R4
137,000km or 91,333miles
Black on gold trim
t- tops
K&N
Flowmaster 80 series
Sony X-plod deck
prestige 6 x 9s
2 crunch 10" bandpass subs running off the uq7 amp from the factory subs (which i blew with those amps)

 

Put in a larger crank. Example; what I did was I took a 350 block and put in a 400 crank and after some boring I had a 383.

I belive that if you take a 305 block and a 350 crank you get a 327.

Your stroking it with a larger crank. You can also destroke; 400 block and 350 crank to get 383.

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87 Camaro
http://www.87camaro.8m.com

 

how easy is this to do?

 

No, putting a 350 crank in a 305 will do nothing. The 350 and 305 have the same stroke. The difference is the 305 has a 3.76" bore and the 350, 327, and the 302 all have the 4.00" bore. You will have to pull your engine and dissasemble it down to the bare block to install the new crank, its a pretty big job, one that I would only take on if you know for sure what you are doing.

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1987 Chevy Camaro IROC-Z
L98 TPI 350 (5.7L)
TH 700R-4 Transmission
Borg Warner 7.75" 9 Bolt Rear End

Current Mods: LT4 Hot Cam, Comp Cams 1.52:1 Roller Rocker Arms, Edelbrock TES 1 5/8" Headers, Hooker 3" Aerochamber Cat-Back System, Performance Resource Chip, Accel Ignition Coil, Cap, Rotor, 8.8mm Wires, K&N Filters, JET TPI Air Foil, All Free Mods, Falken ZIEX Z-Rated Tires.

Best ET (w/o LT4 cam): 14.32 @ 97.7mph
(corrected for elevation)

7.5" 10 Bolt with 3.42s soon to come!

 

Opps sorry about that. I must have heard wrong

 

The 400 crank will need to have the mains machined down to fit in the 305/350 block. You also need the 400's balancer and flex plate since it is externally balanced. You can use the 305/350's standard pistons if you use the 400's shorter 5.56 rods. If you use the longer 5.7 rods then you'll need special stroker pistons. Using the longer rods will also require having the block clearanced to make sure the rod bolts don't hit the block.

Stroking a 305 and .030 is 334
Stroking a 350 and .030 is 383

If you're going to ruin a 400 crank by having it machined down to make a stroker then just build a 400. You'll get the longer stroke plus an even bigger bore. A .030 over 400 is 406.

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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

 

It really wouldn't be worth stroking your 305. There's about a thousand other things that are easier that you can do to improve the performance of that LG4 of yours. If you're thinking about going through the hassle of replacing the crank, you might as well just throw a 350 in there while you have the engine out. You'd probably get more power anyway.

 

I stroke my engine all the time... I say "good little engine" and stroke it until it purrs....


sorry.... couldn't help it..

 

Just changing carburetors did it for me. But my Quadrajet was dying. Now that Holley really woke it up, i can't wait for headers!

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--Steve S--
1984 Trans Am 305 LG4, 5 speed
Daily Driver, Flowmaster 80 Series
Holley 600 cfm & vacuum advance

 

"You can use the 305/350's standard "pistons" if you use the 400's shorter 5.56 rods"


Sorry Stephen, But i think you meant rods. Not trying to slam, just avoiding some confusion.

Also, i was under the impression that a 400 crank wouldn't fit in a 305 block because of oil passages. I may be wrong, anyone know???

"I went this way, he went that way. I said to Hollywood "Were'd he go?" Holloywood said "Were whooo goooo?"

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89 RS Conv 305 700R4
85HO heads
Edelbrock intake
Holley 600
Hedman Hedders and Y pipe
Flowmaster
B&M MegaShifter

[This message has been edited by Chvywolf (edited March 11, 2001).]