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Old 12-14-2012, 03:07 PM
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406 Engine Build...What do you think?

I have a 509 casting, 2 bolt main block bored to 4.155. I'm using a Scat 9000 Series crank, 6 inch scat rods with ARP cap screws, ARP main studs, Probe forged -14cc reverse dish pistons, with blueprint cylinder heads that have 195cc intake runners and 2.02 int. and 1.60 exhaust valves....The cam is a roller thumper cam that has .513 and .498 lift, 227 and 241 duration at .05...also using comp retro fit roller lifters, trick flow 1.5 roller rockers, and Comp chromoly pushrods, Comp dual valve springs, 670 street avenger with 68 primaries and 74 secondaries, .35 pump shooter...What do you think of my setup??
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Old 12-14-2012, 03:49 PM
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Quote:
Originally Posted by lhmurphy View Post
I have a 509 casting, 2 bolt main block bored to 4.155. I'm using a Scat 9000 Series crank, 6 inch scat rods with ARP cap screws, ARP main studs, Probe forged -14cc reverse dish pistons, with blueprint cylinder heads that have 195cc intake runners and 2.02 int. and 1.60 exhaust valves....The cam is a roller thumper cam that has .513 and .498 lift, 227 and 241 duration at .05...also using comp retro fit roller lifters, trick flow 1.5 roller rockers, and Comp chromoly pushrods, Comp dual valve springs, 670 street avenger with 68 primaries and 74 secondaries, .35 pump shooter...What do you think of my setup??
Post the chamber size, piston deck height and gasket part number. I can't determine if it's a good build until I know the static and dynamic compression ratio. Also, if you will post the cam part number, it'll save me from looking it up. Thanks.
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Old 12-14-2012, 04:34 PM
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64cc combustion chamber and my deck height is standard (block hasn't been zeroed) cam is 283thr7...not sure what head gaskets I'm going to use just yet

Last edited by lhmurphy; 12-14-2012 at 04:41 PM.
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Old 12-14-2012, 06:03 PM
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406 Engine Build...What do you think?

I was looking for the 14cc reversed dome pistons on Probe's website. All I found was 15.0 reversed dome and 22.5 reversed domed for 400 ci engines. I hope you have the 22.5 reversed dome or your compression is going to be too high at 10.476 and a DCR of 9.068 with a .015 head gasket. With a .039 gasket your compression will be 9.924 and DCR will be 8.598. But then your Quench will be .064 which is best to be .040.
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Old 12-14-2012, 06:08 PM
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They are probe fully forged srs pistons and they say -14 cc which should give me a 10.3 compression with 64cc heads I'm pretty sure
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Old 12-14-2012, 06:09 PM
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-14cc reverse dish, not dome lol
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Old 12-14-2012, 06:19 PM
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406 Engine Build...What do you think?

Check this website, this is where I was looking for Information. Probe SRS Pistons - Chevy 400 Reverse Dome This is the calculator I used to figure compression ratio. United Engine & Machine Co. Incorporated
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Old 12-14-2012, 06:26 PM
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Lets see what tech says about that little cam?

carb is also small,,,should be a blast at low RPM.
what size of headers are you using?
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Old 12-14-2012, 06:30 PM
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I got the pistons from skip white and not the website and they are -14cc reverse dish...I dunno why the website doesn't show them...and I'm using 1 5/8 long tube headers with 3 inch pipe, true duals straight back...it's in a jeep yj
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Old 12-14-2012, 06:39 PM
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Quote:
Originally Posted by lhmurphy View Post
They are probe fully forged srs pistons and they say -14 cc which should give me a 10.3 compression with 64cc heads I'm pretty sure
I'm with Mr. Minter, I don't see a 14cc dish piston for the 400 block from Probe. If you have such a piston on hand and intend to use them with 64cc chambers, the SCR will be on the order of 10.6:1.

With a 6" rod, the wrist pin will be pushed up into the oil ring, something that I will not build. You won't see a nickel's difference in performance between a 5.7" rod and a 6" rod and you don't have to crutch the ring land to prevent snagging.
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Old 12-14-2012, 06:41 PM
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Quote:
Originally Posted by lhmurphy View Post
I got the pistons from skip white and not the website and they are -14cc reverse dish...I dunno why the website doesn't show them...and I'm using 1 5/8 long tube headers with 3 inch pipe, true duals straight back...it's in a jeep yj
Loosen up and give us a part number.
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Old 12-14-2012, 06:49 PM
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I don't have the part number but skips paper says -14cc and the piston looks like a two valve relief flat top with one half angling down...and I'm not worried about the oil ring
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Old 12-14-2012, 06:54 PM
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Found it...14950-030
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Old 12-14-2012, 06:54 PM
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With ~10.6:1 static compression ratio and that 12-600-8 camshaft, dynamic compression ratio will be 9.31:1. GOOD LUCK!
12-600-8 - Thumpr
Intake valve closes at 35.5 degrees ABDC @0.050" tappet lift.
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Old 12-14-2012, 06:58 PM
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Originally Posted by vinniekq2 View Post
Lets see what tech says about that little cam?

carb is also small,,,should be a blast at low RPM.
what size of headers are you using?
I have a friend pushing 440 horse with a 400 sbc and he has a 670 street avenger...that's why I don't think the carb is too small
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