My brother has a 69 Firebird with a rebuilt 350 Pontiac engine in it. He would like to know how far he can safely bore out the block. This car will be a daily driver, so we want it to be reliable. Thanx.

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1984 Trans Am Coupe
700-R4 Tranny
Mods:
K&N
Rebuilt carb
Rebuilt heads
3" Mandrel Exhaust
Hooker Headers
Lunati Cam
1" Lowering Springs
Clarion CD
Kicker Speakers
2 MTX 4000
Pearl White Paint

"Live It To The Last"

 

on that engine personally i'd say no more than .040.

 

I've heard the safest you can bore any block is .060.

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'86 IROC 5-speed
305 LG4
edelbrock performer rpm intake
edelbrock 600 cfm carb
msd pro billet hei
'95 3.23 rearend
hotchkis rear suspension

 

Some blocks can't go +.060" You should have it sonic checked. I have a +.060 '73 350 4 bolt main block that has more cylinder meat than a 76 virgin 350 2-bolt in my backyard, plus it's suffering from core shift and it's thin in the worst possible area, on the thrust side. My machinist didn't even want to take it +.030"

 

Huck,

If the bores don't clean up at the next nominal oversize, all is not lost. If you're not in a hurry to finish the rebuild, pistons can be machined in alnost any finished size. On top of that, the old Poncho cases have a very solid casting design at the bottom end, and are one of the few engines that survives well with cylinder sleeving.

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Later,
Vader
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"Let the bodies hit the floor!"
Adobe Acrobat Reader

 

thanx everyone