Couple of 455 block questions
March 14th, 2019, 09:40 AM
#1
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Couple of 455 block questions
1) this block has various letters stamped in between the cylinders (B, C or CC) any idea of what they indicate? Or is it a possible stamping from a machine shop?
2) There is a bolt/plug on either side of block between motor mount and center freeze plug. What’s that for.
Thanks
2) There is a bolt/plug on either side of block between motor mount and center freeze plug. What’s that for.
Thanks
March 14th, 2019, 10:14 AM
#3
Old(s) Fart
Join Date: Mar 2007
Location: Northern VA
Posts: 47,723
Yes, this is a 1968 Toro motor. The VIN derivative shows a build sequence number of 602417. Toronado sequence numbers started at 500001, so this is from a Toro.
Unless you know this motor was previously rebuilt, the letters are likely the factory tolerance markings. Olds sized the bores and pistons in one of four size ranges, A through D. The block was sized and the pistons selected to match.
If the "plug" you are referring to is about in line with the bolts for the motor mounts, there are actually two per side (one is under the motor mount). These are just pipe plugs to drain the coolant from the block.
Unless you know this motor was previously rebuilt, the letters are likely the factory tolerance markings. Olds sized the bores and pistons in one of four size ranges, A through D. The block was sized and the pistons selected to match.
If the "plug" you are referring to is about in line with the bolts for the motor mounts, there are actually two per side (one is under the motor mount). These are just pipe plugs to drain the coolant from the block.
March 14th, 2019, 01:29 PM
#4
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The freeze plug kit came with 2 new plugs. Wasn’t sure if this was where they went or not. Seemed somewhat solid behind them, but I didn’t check much. Just to see if they would come out.
Motor has been rebuilt at some point. It’s .030, but seemed to be a stock cam. It was a junkyard find with a Turbo 400 in a mid-80s GM truck! Chrome valve covers prompted me to take a closer look. Now it’ll be going in my ‘71 Cutlass after slight warming over.
Motor has been rebuilt at some point. It’s .030, but seemed to be a stock cam. It was a junkyard find with a Turbo 400 in a mid-80s GM truck! Chrome valve covers prompted me to take a closer look. Now it’ll be going in my ‘71 Cutlass after slight warming over.
March 14th, 2019, 01:34 PM
#5
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March 27th, 2019, 08:54 AM
#6
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I have a 69 Cutlass S conv. A previous owner put a 455 in it. Casting # 396021Fa. I know that is 72-76. Is there any way to determine which year? The HP varies quite a bit. Judging by other mods they made I assume it was done for more HP so I am hoping it is an early one but have no way of knowing for sure. Help!
thanks
Steve
thanks
Steve
March 28th, 2019, 03:58 PM
#9
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March 29th, 2019, 05:34 AM
#11
Old(s) Fart
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Location: Northern VA
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All BBO heads (except D heads) have the same combustion chamber size (80 cc blueprint spec, about 82-84 cc as cast). The J heads were used on 73-76 smog motors and have smaller, more restrictive ports.
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