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Discussion Starter #1
Anybody have any info on a bullet cam that came out of my 390
#s on the end of cam are

BULLET
S-4272
290
302
8F

I checked the lift and at the came is about .346 on exhaust and .356 on intake.
 

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Discussion Starter #2
Called Bullet cams, they were very helpful.

• .050 Duration: 255° Intake; 262° Exhaust
• Advertised Duration: 290° Intake; 302° Exhaust
• Cam Lift: .356 Intake; .342 Exhaust
• Valve Lift: .628 Intake; .602 Exhaust​
• Lobe Center: 108°
 

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Discussion Starter #3
Called BRC on the pistons
15cc dome
1.786 compression distance
bore is 4.10
stroke is stock 390 3.78
 

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Called BRC on the pistons
15cc dome
1.786 compression distance
bore is 4.10
stroke is stock 390 3.78
That is a big cam :O solid lifter? flat or roller?
The 390 had a stock bore of 4.052, so it looks like your block has been bored pretty big.

How did the block turn out? was it damaged at all?

What are your plans for it? street it? or race it again?
 

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That is a big cam :O solid lifter? flat or roller?
The 390 had a stock bore of 4.052, so it looks like your block has been bored pretty big.

How did the block turn out? was it damaged at all?

What are your plans for it? street it? or race it again?
plus .060' over makes it "pretty big" ?
 

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Block is good to go. just going to do a quick hone. now i need to find a crank.
Any machine shop should have one. If you can't, I am sure someone on the forum here has one they can sell. are you looking for anything special? or just a stock cast unit.
 

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Tell me how many/much more overbore he can expect before he has to sleeve at least a couple cyls.
you tell me how much the block Had to be bored to correct wear .

what if it needed .060' over ?
tell what you would have done with the block . srap it ? srap it so you could get one or two more borings out of another block ?
 

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you tell me how much the block Had to be bored to correct wear .

what if it needed .060' over ?
tell what you would have done with the block . srap it ? srap it so you could get one or two more borings out of another block ?
.060 over is about the max safe overbore for most 390's. OP says all it needs is a hone this time

It's been bored out to about the max and that to me is a big. W/O sleeves, tell me how to get around that to correct wear.

if it needs more, and will be run hard... its up to the owner and the sonic test to see if it will hold up. more likely than not there will be thin spots. 390 blocks are cheap, cheaper than chewing up the rest of the motor over. and cheaper than 8 sleeves.
 

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.060 over is about the max safe overbore for most 390's. OP says all it needs is a hone this time

It's been bored out to about the max and that to me is a big. W/O sleeves, tell me how to get around that to correct wear.

if it needs more, and will be run hard... its up to the owner and the sonic test to see if it will hold up. more likely than not there will be thin spots. 390 blocks are cheap, cheaper than chewing up the rest of the motor over. and cheaper than 8 sleeves.
when you learn about building (not bolting parts togther) engines and parts you'll know .

I don't know the history or the build specs of the 390 .
How Do you know what they are ?
 

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when you learn about building (not bolting parts togther) engines and parts you'll know .

I don't know the history or the build specs of the 390 .
How Do you know what they are ?
OP told us the information.

Do explain what I need to know about building before making an arrogant comment
 

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OP told us the information.

Do explain what I need to know about building before making an arrogant comment
make the comment ..

then , you should never have to ask a question on engines .
then on all engines questions , you can be the first poster with correct detailed info
 

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So you know it all. Too bad you never give detail info.
thats the comment !

no I don't no it all . I do know way , way more that you .

do know that you make like you know ..

when the detail info is required , its given
 

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thats the comment !

no I don't no it all . I do know way , way more that you .

do know that you make like you know ..

when the detail info is required , its given

I hope you know way, way more than me, you are 3 times my age.

you make like you know everything, and argue a point until you are actually out of your depth of your hands on experience and further arguing on your part would actually show that some people on this forum have a better knowledge than you...

When detailed info is required you make snide comments and let others answer the questions. On occasion you point out some flaw that helps, but you do it more to flaunt your knowledge than actually help...
 
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