slusher

How much overbore will these blocks handle before splitting .

xdclevo

30 thou seems the safe max, but in rare occasions, you can have trouble at 30 as well.

TruBlu351

Yeah, playing the odds, I'd be happy with 30thou over. Personally, I wouldn't go over that.....I'd just source another block. All 5 of mine have been 30 over

How much power you planning on having?

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XE Falcon
393 Tremec TKO 9"

slusher

Old combo i had laying around 3.60 stroke 5.7 chevy rods 12.5 cleveland pistons 740 lift roller . Never had it on dyno . Ran 10.40s 130 4 years ago in 2800 pound mustang only change useing a set of gapp and roush high port heads. Going in 65 falcon im building.
would like bigger bore for these old prostock heads to breath. thouht about furnace brazing a block with big sleves old school .

slusher

I was hoping aussie block would take a bigger bore. close to 600.00 to buy one .Save my money get a aftermarket block.

TruBlu351

Yeah, that's way too much for an old block.

I think the aftermarket block is a good decision, especially with the power you are after.

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XE Falcon
393 Tremec TKO 9"

cjperformance

only the 82/84 F350 block (siamese cylinder bores, often refered to as the nascar block) will take a decent over bore. tru blu is right, .030" is about it for stock block and performance use. save money in the long run and go aftermarket. cheers

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Craig Johnston.
Ford, Performance & Vintage engine specialist.
email- cjperformance@lizzy.com.au