Goal- Stock looking engine for my 64 Impala with good drivability and as much performance as can be squeezed inside. The Impala is used as a Sunday driver/special event type car. Nice cruising manners are prefered, with gobs of power when the mood strikes, is what I am trying to maximize here. Since this is a 383, high rpm performance is not what I am aiming for, but rather broad low-mid range power. Car has power brakes, air conditioning and automatic transmission. I had the 383 stroker, built for me by my mechanic 20 years ago. Seems to be in fair shape. I am going to tear it down for cleaning and rebuilding as needed. I intend to dress it up like a 327 from 1964, which I know will involve some work with the PCV system. Keeping things looking stock on the outside will constrain how much can be done here, but I don’t want miss any tricks that I could do.
What I have in there now:
-Engine Block, casting number 3970010 used from 1969-79 for 350 engines.
-Intake 3927184 used in 1969 for 350 engines
-Heads 3947041 used from 1968-79 for 327 and 350 engines. Valve sizes look up as 1.94 / 1.5
-Cam is unknown, as I recall it was a ‘mild cam’ that was put in.
-Exhaust casting numbers 3797942 and 3846563 correct for 1964 high performance 327. 2.5 inch rams horn with 2.5 inch Schafers stock exhaust system with resonators. 2.5 inch to muffler, 2 inch tail pipes.
-Compression ratio – not sure, but it was built to require premium gas.
-Transmission TH350 with ‘shift kit’ to make shifts fairly snappy. It will chirp the wheel at full throttle 1-2 shift.
-Rear end is stock with a 3.55 ratio, open differential
What I will have:
-Intake 3844459 (got it)
-Carburetor Carter AFB 3783s or 3499s 1964 409/400hp aprox 625 cfm. Externally looks like the Carter AFB used on the 327/300hp engine for 64, and recommended by thecarburetorshop.com. (looking for one)
-Hydraulic Roller lifters??
-Transmission 700R4 built for “up to 450 hp” by very reputable local shop.
-Rear end to be beefed up and add limited slip with a ratio of 3.7ish. That ratio should get me in the 2,200 rpm range at freeway speeds, which seems to be the consensus.
Since I am rather limited on some of items that I can change, because I want this to look like a stock 64 engine, I have a few questions about what is practical.
1) Would porting/polishing the intake and heads be a good investment?
2) Would some aftermarket heads be good (assuming they could, at first glance, pass off as stockers when painted the proper shade of orange) ? I don't seem to need accesory bolt holes and some aftermarket heads have bolt holes for stock style valve covers. But I don't know if the trick valve components stick up higher than the stock cover will allow.
3) Would roller lifters and matching cam be able to get me the most out of this or would I be wasting $500 for the rollers?
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