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  1. #1
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    Default 302W, 347 stroker

    Need some advice/suggestions on timing for WOT. I am helping a friend select parts for this engine, which will be going into a hot rod. Max rpm 6500, reasonable idle reqd, 5 spd manual.

    Here are the engine specs.

    - 347, using AFR 185 heads.

    - Owner tells me he wants 10.5:1 CR, to run on 98 pump petrol. I am not sure what chamber size he has, the 185s come in 58 & 70 cc. I have seen the heads & the chambers look too deep for 58 cc. Using 9cc for a 0.040: h/gasket, FT pistons 0.010" down in the hole, I come up with 11.3 & 9.8 CR for the two chamber sizes. Need to look into this further.

    - intake man is a Weiand Stealth d/plane [ sorry Paul...]

    - cam hyd FT 228/228 @ 050; 108 LSA

    - 1.7 rockers with beehive sprgs

    - Ford Thermoquad modified by me

    - GM HEI dist

    - headers

  2. #2
    Do you ever leave? paulzig's Avatar
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    Is it a true flat top? Usually the pistons for these have a 7cc or so valve relief...

    For a 7cc relief piston, your standard felpro HG .040 thick 4.1d with a 58cc chamber .010 down piston I get 10.38...

  3. #3
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    Thanks Paul. Yeah I forgot to allow for valve reliefs. Not sure what pistons are being used. I get 10.5 using 6cc reliefs with a flat top. So certainly around ~10.5.

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    Do you ever leave? paulzig's Avatar
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    You can buy DSS, Wiseco, etc... They are around a 6cc...

    You really need the 58cc heads...

  5. #5
    Do you ever leave? EH179's Avatar
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    What's involved to make the GM dissy fit the Windsor?

  6. #6
    Do you ever leave? paulzig's Avatar
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    Quote Originally Posted by EH179 View Post
    What's involved to make the GM dissy fit the Windsor?
    Didnt notice that lol... Probably some machining and a gear...

    I looked through the build, and the parts list is the exact opposite of what I would get except for the 1.7 rockers

  7. #7
    Do you ever leave? EH179's Avatar
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    Will this have vacuum advance fitted?

    What diff gears?

    Need more info' on the final specs to make a suggestion.

  8. #8
    Not the Kingswood! hq308's Avatar
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    Quote Originally Posted by EH179 View Post
    What's involved to make the GM dissy fit the Windsor?
    Probably an aftermarket GM HEI "style" distributor specifically for the Windsor is my guess

  9. #9
    casual poster Willie's Avatar
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    There are HEI distributors made specifically for Ford V8's.

  10. #10
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    Yep, aftermarket Ford dist in the GM HEI style, available from Road Star in Sydney, $60. Comes with adj vac adv which will be connected to manifold vacuum.

    3.55 diff gears.

    Not sure what pistons, or if the owner has bought them yet. He just told me he is aiming for 10.5:1 CR.

  11. #11
    Do you ever leave? paulzig's Avatar
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    Quote Originally Posted by GtoGeoff View Post
    He just told me he is aiming for 10.5:1 CR.
    10.5 is the most popular compression ratio in the world

  12. #12
    Do you ever leave? EH179's Avatar
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    Quote Originally Posted by paulzig View Post
    10.5 is the most popular compression ratio in the world
    I have information from BP stating that 10:1 is the highest we should run on BP 98...howboutdat!

  13. #13
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    Quote Originally Posted by EH179 View Post
    I have information from BP stating that 10:1 is the highest we should run on BP 98...howboutdat!
    Interesting. Does BP say you can get away with a bit more compression with alloy heads? Id always been under the belief that about 11 to 1 is a good place to stop on 98 fuel. Or are BP just covering their ass?

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    Do you ever leave? EH179's Avatar
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    Quote Originally Posted by 46Crab View Post
    Interesting. Does BP say you can get away with a bit more compression with alloy heads? I’d always been under the belief that about 11 to 1 is a good place to stop on 98 fuel. Or are BP just covering their ass?
    This is from BP website: https://www.bp.com/content/dam/bp-co...tane-power.pdf

    Not a lot of detail as you would expect, regarding modified engines/ alloy heads etc.

    Also note the recommended air/fuel ratio's for each fuel type.

  15. #15
    Do you ever leave? TRIKHQ's Avatar
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    Quote Originally Posted by 46Crab View Post
    Interesting. Does BP say you can get away with a bit more compression with alloy heads? Id always been under the belief that about 11 to 1 is a good place to stop on 98 fuel. Or are BP just covering their ass?
    Alot of this depends on engine combo, cam etc, I run 12:1, have 205lb cylinder pressure and run 98 just fine. Duno made 642HP, I got dynamic comp of 8.81.

    Built a 347 Windsor with alloy heads a little while back with 11:01CR. Dynoed fine on 98.

    Cheers

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