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Do your RESEARCH on ALL of these routes (ideas)for more
compression. Then decide which is feasible to you in effectively giving the compression you need for the LEAST amount of cash outlay.

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it's going to end up costing alot whether he gets a diamond or a flat top KB , with the KB you have to cut more off the block and the heads because of that canyon ...

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I'd just go with the KB 400's

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there's a set of em for sale right now in the parts section . For sure cheaper than full retail

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I'd just go with the KB 400's and 84cc Eddy heads. I think on a budget build the extra compression is gonna do more for you than quench and you can save from having to cut up your heads.

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I agree, that's what I'm running with an 80cc head. 9.9:1 compression ratio with no detonation and no quench really (.063). Let's say it's enough to through you back in the seat and leave 50 foot slabs down the road.

Without power braking.

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Do your RESEARCH on ALL of these routes (ideas)for more
compression. Then decide which is feasible to you in effectively giving the compression you need for the LEAST amount of cash outlay.

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it's going to end up costing alot whether he gets a diamond or a flat top KB , with the KB you have to cut more off the block and the heads because of that canyon ...

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There are other avenues of approach to get to the
anticipated compression ratio, than just the pistons.

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The KB 400 is a dome top i told you this in the first post earlier .
I slapped together my dads 383 with the kb 400 edelbrock heads ,rpm intake ,comp cams 275 hl .525 cam and the cheapest headman headers summit sells . The car is a 68 charger with 727 trans and 3000 stall from PTC with 3:55 sure grip . I put a out of the box Holley 750 hp vacuum secondary , never tuned anything except the normal carb and timing adjustments .
I think i built the engine under 3 grand and the performace is awesome the car is a fun street car with unbelievable top end power .
IF you build it like this you will be happy ! you will be able to burn the tires with out brake tourqeing at will .
I would not buy the 162 pistion unless you want to take alot off the deck and heads . to get 9.0 to one compression !
the kb 400 will easy get 10to1 .

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Good combination!!

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I'd just go with the KB 400's and 84cc Eddy heads. I think on a budget build the extra compression is gonna do more for you than quench and you can save from having to cut up your heads.

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I agree, that's what I'm running with an 80cc head. 9.9:1 compression ratio with no detonation and no quench really (.063). Let's say it's enough to through you back in the seat and leave 50 foot slabs down the road.

Without power braking.

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Nice!!

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Ok, but the bottom line is this is a half ass budget build. I wasn't aware that there were such crappy piston choices for 383's and that 906's were essentially useless.

My setup, with the parts I listed, with a block that's been zero decked, KB flat tops (with the 5cc or whatever size valve reliefs), closed chamber 84 cc Edelbrock heads and a .039ish head gasket sounds like it should make decent compression and quench. Does that sound about right? I'm just hoping for a decent street motor.

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Do your RESEARCH on ALL of these routes (ideas)for more
compression. Then decide which is feasible to you in effectively giving the compression you need for the LEAST amount of cash outlay.

---

it's going to end up costing alot whether he gets a diamond or a flat top KB , with the KB you have to cut more off the block and the heads because of that canyon ...

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There are other avenues of approach to get to the
anticipated compression ratio, than just the pistons.

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Quote:

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Quote:

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Ok, but the bottom line is this is a half ass budget build. I wasn't aware that there were such crappy piston choices for 383's and that 906's were essentially useless.

My setup, with the parts I listed, with a block that's been zero decked, KB flat tops (with the 5cc or whatever size valve reliefs), closed chamber 84 cc Edelbrock heads and a .039ish head gasket sounds like it should make decent compression and quench. Does that sound about right? I'm just hoping for a decent street motor.

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What is your definition of DECENT COMPRESSION ?

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Ok, but the bottom line is this is a half ass budget build. I wasn't aware that there were such crappy piston choices for 383's and that 906's were essentially useless.

My setup, with the parts I listed, with a block that's been zero decked, KB flat tops (with the 5cc or whatever size valve reliefs), closed chamber 84 cc Edelbrock heads and a .039ish head gasket sounds like it should make decent compression and quench. Does that sound about right? I'm just hoping for a decent street motor.

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What is your definition of DECENT COMPRESSION ?

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I think you know more about it than I do, but I was thinking 9.5-1?

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Ok, but the bottom line is this is a half ass budget build. I wasn't aware that there were such crappy piston choices for 383's and that 906's were essentially useless.

My setup, with the parts I listed, with a block that's been zero decked, KB flat tops (with the 5cc or whatever size valve reliefs), closed chamber 84 cc Edelbrock heads and a .039ish head gasket sounds like it should make decent compression and quench. Does that sound about right? I'm just hoping for a decent street motor.

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What is your definition of DECENT COMPRESSION ?

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Ah, like 100% PUMP gas friendly. BUT will make
great power with the highest allowable compression
for the octane used in HIS area!!

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That number is obtainable but the thing is the aluminum heads pull so much heat out of the combustion chamber you really need another ,5-1.0 points of compression to start taking advantage of them....

I'm on the border with 9.9:1.

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Still do-able!!

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Ok, but the bottom line is this is a half ass budget build. I wasn't aware that there were such crappy piston choices for 383's and that 906's were essentially useless.

My setup, with the parts I listed, with a block that's been zero decked, KB flat tops (with the 5cc or whatever size valve reliefs), closed chamber 84 cc Edelbrock heads and a .039ish head gasket sounds like it should make decent compression and quench. Does that sound about right? I'm just hoping for a decent street motor.

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What is your definition of DECENT COMPRESSION ?

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I think you know more about it than I do, but I was thinking 9.5-1?

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Ok, but the bottom line is this is a half ass budget build. I wasn't aware that there were such crappy piston choices for 383's and that 906's were essentially useless.

My setup, with the parts I listed, with a block that's been zero decked, KB flat tops (with the 5cc or whatever size valve reliefs), closed chamber 84 cc Edelbrock heads and a .039ish head gasket sounds like it should make decent compression and quench. Does that sound about right? I'm just hoping for a decent street motor.

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What is your definition of DECENT COMPRESSION ?

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I think you know more about it than I do, but I was thinking 9.5-1?

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The specs you give above ASSuMEing a 4.280 bore , 6cc valve canyon and a .041 head gasket , not sure what gasket is .039 , gets you 8.85 , .039 gasket is 8.88, 5cc/.041 - 8.92, 5cc/.039 - 8.96, you need to cut the heads to 76cc to get your 9.5, the 162 just plain sucks for the intended application.

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The 162's are out of the question as you stated, unless used with an UNDER 78cc closed chamber type head (516's or early 60' 413's - non M-W's). The kb 400
works well with an 80 - 86 cc aluminum head, OR the "516" iron head (with larger valves) depending on how "strong" of a 383 you want!! The 375-400 hp level is easy, it's
when you break the 475-500 hp level things start to get lot tougher (for streetability).