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Old January 8th, 2012, 11:09 AM   #1
eagle-eye
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Default 351w build

What pistons would i need to put into my 351 windsor to bring it to about 10:1 or 10.5:1 compression with afr 185cc heads with a 58cc chamber?
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Old January 8th, 2012, 12:53 PM   #2
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This is probably the best buget pistion out there, have the block 0 decked, run a .038 head gasket and you will have just over 9.8:1.

http://www.summitracing.com/parts/PBP-P2446F-030
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Old January 8th, 2012, 02:45 PM   #3
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arent stock 351 heads 69cc chamber?
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Old January 8th, 2012, 07:06 PM   #4
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Quote:
Originally Posted by eagle-eye View Post
arent stock 351 heads 69cc chamber?
Depends on the year and head, casting number?
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Old January 9th, 2012, 05:16 PM   #5
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wont have it until sometime tomorrow. I will google it to see what comes up.
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Old January 14th, 2012, 02:15 AM   #6
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69 or 70I are the best year head for a 351w
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Old January 14th, 2012, 12:12 PM   #7
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Is there any way to bring this to 10:1 compression without machining the block?
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Old January 14th, 2012, 12:20 PM   #8
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What heads? You first said afr and now talking about stock heads?
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Old January 14th, 2012, 02:31 PM   #9
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No reason to machine the block if the cylinder walls don't need it.
Change heads or pistons.
Or you could machine the heads and intake to get some more compression but then you have to check piston to valve clearance and pushrod length.

What is the goal?

10.5:1 is pushing it on pump gas depending on what the timing is at.
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Old January 14th, 2012, 04:32 PM   #10
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Stock timing, gonna go with afr 185s with 58cc chambers and planned on switching pistons. Want amax of 10.2:1.
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Old January 15th, 2012, 01:41 PM   #11
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http://www.kb-silvolite.com/kb_car/index.html

Download the catalog and go to page 36 for the 351 stuff. Lots of options to get you where you want. Have a nice chart telling you compression with different heads.
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Old January 17th, 2012, 01:13 PM   #12
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you just speak of compression...but what do you plan to run for cam? fuel delivery? Fuel type... E85? What is your goal for HP?
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Old January 17th, 2012, 01:26 PM   #13
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With alum. heads I would not run over 10:1 on pump gas in a truck.
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Old January 18th, 2012, 01:21 PM   #14
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Quote:
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With alum. heads I would not run over 10:1 on pump gas in a truck.
Why not? The aluminum heads release more heat than iron heads which will allow you to run more compression before detonation starts.
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Old January 18th, 2012, 01:33 PM   #15
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You can get away with it in a light vehicle, decent sized cam and maybe a looser converter but a heavy vehicle, smaller cam, tighter converter all make it more prone to detonation. BTDT.

It also depends on how it is built, something with a dome to get compression up but way down in the hole might detonate @ 10:1 where a flattop set up with the proper quench will not.

Really depends on what the OP's supporting parts, what fuel, uses, and goals add up to.

That said, most people don't have near the compression they think they do, heads and pistons are normally not what they are advertised, pistons are left down in the hole .030", the volume above the ring lands and not accounted for ect.
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Old January 19th, 2012, 09:49 AM   #16
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the cam is going to be of comp cams variety #35-424-8. Fuel delivery is going to be efi with an edelbrock truck intake. 30LB. injectors with a calibrated maf, twin 56mm throttle body, afr 185 heads with 58cc chambers. The goal is to knock on between 400-450hp's door.
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Old January 19th, 2012, 10:08 AM   #17
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That cam is a retrofit for older blocks, don't you have a roller block? If so you will need something like this. 35-328-8
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Old January 19th, 2012, 01:59 PM   #18
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what is categorically classified as a roller block? is it where there are two threaded posts in the valley? if that is the case then i dont have a roller block.
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Old January 19th, 2012, 02:55 PM   #19
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Yeah it should have the bosses to bolt the lifter retainer to. What is the casting number above the starter?
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Old January 20th, 2012, 11:07 AM   #20
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400 hp is a long shot. You have to do more than just bolt stuff on to a 351w to get 400hp.
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