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  1. gtxrt

    ported heads vs HP gain

    if you have a stock engine with decent flowing heads from the factory and then take the stock heads and mildly port them. then put them on the same stock engine will there be a HP gain and or will the peak TQ and HP move to a higher rpm.
  2. gtxrt

    head flow numbers.

    not sure why the flow went bad after .300 lift. the stock intake valve was 1.87 new one 1.94. want to get another 10 cfm after .300 lift. with a stock intake valve on stock heads they make 190 cfm at .500 lift.
  3. gtxrt

    short shaft tranny

    if you need a short shaft 727 can you use the long shaft tranny and put the short shaft on it ?
  4. gtxrt

    autolite plugs

    what is the difference between autolite 4275 and 75 plugs
  5. gtxrt

    the bowl area

    is there any gain in cleaning up the bowl area in 915 heads with a nice valve job already. if so where is the gain if not revving much over 5000 rpms. thanks for your opinions.
  6. gtxrt

    what gas is better

    what would be better and more power, non ethanol 90 with 30* total timing or ethanol 93 with 33* total. any more timing than 30 or 33 will cause pinging.
  7. gtxrt

    spark plug photos

    they say the ground strap darker burn should be closer to the bend. so is mine to cold of a plug because it's toward the tip ? 440 9.5 compression xr5 ngk plugs.
  8. gtxrt

    edelbrock AVS2

    what a difference off idle and any thing under 15 mph with AVS2 800cfm compared to the old 750 carbs. sometimes i would get the off idle stumble and less power with the old carb.
  9. gtxrt

    combustion chamber question

    if you have a tight quench pistons up high with a good combustion chamber like close chamber 915 heads would you need more fuel [jetting] or less to make power. am thinking it burns more efficient so it would need and handle more fuel ?
  10. gtxrt

    rpm performer ?

    pretty sure it a rpm edelbrock 440, numbers on bottom 19409 and 4983. will cutting center down hurt bottom end ?
  11. gtxrt

    ch4b testing or dyno.

    does anyone one have personally or first hand testing on a ch4b intake. I read all the magazine articles most were on well built engines. wondering on a mild build with stock heads turning about 5200 rpms. Thanks
  12. gtxrt

    intake flow numbers

    doe's anyone know the flow numbers for a stock 440 intake, read 200 cfm but then on hughes engines they have a ch4b at 273 cfm. can't be that much difference 200 cfm vs 273 cfm. thinking stock should flow more than 200 cfm.
  13. gtxrt

    170 lbs compression

    what do you guys think on a new rebuilt street engine with 170 lbs of cranking compression, to high or low or just about right. runs good with 35-36 total timing. 217-221 on 110 LSA with 107 centerline.
  14. gtxrt

    11 inch converter

    how much difference in stall between a 1967 383 12 inch converter and a 1971 11 inch that came in a 383 super bee.
  15. gtxrt

    1971 383 compression height

    doe's anyone know the piston compression height on a 1971 383 hp motor. thanks.
  16. gtxrt

    torque converter

    anyone using the Hughes 24-20, 2000 stall converter. wondering how the stall was. thanks
  17. gtxrt

    pin height

    1967 440 350 hp, piston pin height, 1.99 or 2.00 any one know which one . thanks
  18. gtxrt

    compression vs deck height

    440 engine, 217-221 cam with 90 octane gas. what's the best way to go. felpro-8519 head gasket with 9.57 comp and 57 thou quench. or felpro 1009 9.6 comp with same 57 quench. or cometic gasket with 9.80 compression and 48 thousand quench. don't want that dreaded ping. thanks.
  19. gtxrt

    what stall torque converter

    need some input on choosing a converter. 3900 lbs. 276 open gears, have a 294 posi going in. 440 mild built 9.5 compression with forged pistons. 217-221@50. 482-488 lift on a 110 LSA. converter in now is a 383-2 barrel 12". in the past i used a Hughes XTM 12" on my 67 rt and was to tight. they...
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