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had the old timer Charlie at PTC converters build me a 11" 19 spline. told him i want like 2200 rpm stall like the 383 11" factory converter with positive fin bend. came out perfect very happy. not sure about the longevity of it. 365.00 shipped.
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.
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.
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.
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.
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.
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.
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 ?
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
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.
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.