commando1
Old Man with a Hat
Interesting. Never saw anything like this.
Jakes 383 rebuild
- Thread starter jake
- Start date
commando1
Old Man with a Hat
You're measuring how much the piston sits in the hole?
Correct, .025 down. With gasket .039 and 73.5cc heads, I should be running around 9.3 to 1.
commando1
Old Man with a Hat
Right on! I'm impressed you checked and calculated thr CR.
70bigblockdodge
Old Man with a Hat
Top ring gap is .028 that seems high.
70bigblockdodge
Old Man with a Hat
That's ring clearance in the lands. The rings are usually .0035-.004 per inch of bore and.the second ring is usually more loose like .004-.005 per inch. Larger gap on the second ring let's any trapped pressure out between so top ring can stay against the cyl wall and not flutter or be pushed off wall by trapped pressure, losing the seal. Always error looser than tighter, above numbers would be a minimum .028 is out at the far end okay if engine has 100,000 miles on it but to start that loose and when initial break in wear settles, I would think it would end up too big.
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youve never seen a ball hone Stan?Interesting. Never saw anything like this.
70bigblockdodge
Old Man with a Hat
That's a "dingle" ball hone, or glaze breaker.
Ripinator
Old Man with a Hat
Cam kit. . . What kinda cam are you gonna run ? I remember Clay Smith had a solid lifter cam for a two four-barrel 383 that was developed with Chrysler engineering. It was a mighty fine cam.
commando1
Old Man with a Hat
Nope. Then again, I don't hone. I drop the block off at the machine shop. lol
You say dingle balls to me and all I can think of is an East L.A. upholstery job...
has2bmopar
Senior Member
If your deck clearance is .025" you should be at 9.4:1.
If your deck was a true 9.98" I show .0265" below deck you would still have 9.37:1
Most posted piston compression specs in the past were way off and I still don't trust them, so I always do the math and always check my combustion chamber volume.
For a reference to others here's how to calculate your deck clearance before you buy pistons....
383 B engine specs
Bore 4.25"
Stroke 3.375"
1/2 Stroke 1.6875"
Deck height 9.98"
Rod length 6.358"
Keith Black piston specs
Comp height 1.908" (from wrist pin center)
Valve reliefs -5cc
9.98 Deck
- 6.358 Rod length
- 1.6875 1/2 Stroke
- 1.908__ Comp height
.0265 Deck clearance
I found the comp cam k21-221-4 to my liking. I know a lot of people don't like them or the kb pistons, but every web page I turn, everybody hates every brand. So I decided to go with the best overall deal and cam that I believe will fit my needs. Picking out a cam is harder then choosing a women to marry!
I thought valve relief adds ccs?
70bigblockdodge
Old Man with a Hat
Learned something new. Sounds like BS but I'm not a piston manufacturer or designer.
has2bmopar
Senior Member
If you want to add them, you can just add the valve relief CCs to your chamber CCs; I subtracted them from the piston... A solid vs. your void.
I pick up my beer in my left hand, others may use their right... Either way works... See -->
Nope. Then again, I don't hone. I drop the block off at the machine shop. lol
You say dingle balls to me and all I can think of is an East L.A. upholstery job...
Ball hone was 60 bucks, machine shop and trip 300 bucks.
70bigblockdodge
Old Man with a Hat
Did your rings come with the pistons and what thickness are they?
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