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just think if he had the rpm performer could have had a tick short of 530 HP.

yes bigger plenum hurts a little torque down low and throttle response and picks up a little hp in the upper rpms. i tested 5 intakes on the street and you can find an old post of a member testing ch4b and I think a performer and weiand. it helped less than a tenth in a 1/4 mile I think it was...

there is the rpm performer but not if you need hood clearance. had to mill my rpm carb top plate a 1/4 inch for hood clearance.

i would do the M1 dual plane and have it ported. my cast iron i ran was ported and was way better then the ch4b and performer which were no better than stock.

i was running a 750 edel with 2.94 gears that ran great. every so often off the line it would hesitate if the intake wasn't heated fully no big deal. wanted to try the 800 AVS2 big difference off the line and at lower rpms i would say 30 HP or TQ difference not sure which one. not much if any...

an opener spacer helps 75% of the time a 4-hole 10% of the time and will only help mostly for throttle responses and low rpm. that is right from Big Joe engine masters king and dyno king who was testing spacers since he was 16 years old.

if it's leaking around the throttle shaft it will be harder to rebuild. i take it you're not impressed with your avs2 carb ?

i have used the sd on three different 440 engines one was a 4-speed with 3.54 gears and could watch the tach when the car turned on it was over 3000 rpms closer to 3400 rpms it seems but i could also holeshot it at 3500 rpm and blow the tires off. different on a automatic with a stock or near...

what gears and torque converter did you have.

Yes, iron or rpm performer the dp4b will not help much and the street dominator will only turn on after 3400 rpms.

used it for years they claim full points. any ways i use 8 oz per 10 gallons of gas. with out it i get a slight ping once in a while. does feel more powerful with it.