Guest Posted August 31, 2000 Share Posted August 31, 2000 I have a stock 455 70 Riviera that I'd like to tweak up as a weekend toy. I've been drooling over the Poston catalog and trying to decide what to buy. I want to keep the car street driveable but don't mind living with less than excellent gas mileage, octane boosters, and a rough idle. I have other daily driver cars. My thoughts so far:<BR>-Poston Stage 1 ported heads (worth the $1k?)<BR>-Rebuild mine or buy rebuilt TH400 w/3000 rpm switch pitch converter<BR>-Poston crossflow intake<BR>-Poston headers<BR>-Poston rebuilt Q-jet<BR>-Custom 3" exhaust system w/Flowmaster mufflers<BR>-new cam (need ideas here)<BR>-posi rearend w/3.23 or 3.5 ratio (need ideas here also, currently 10 bolt non-posi)<BR>-other ideas?<P>Also, the engine has 63K original miles and doesn't burn any oil. Should I go all the way and rebuild the block now or slap on the go-fast parts and see what happens?<P>Thanks guys, I'm new to Buicks and appreciate your feedback.<P>John Link to comment Share on other sites More sharing options...
Guest Posted August 31, 2000 Share Posted August 31, 2000 Forgot to mention a new distributor. Any ideas to swap out the stock one with a non-point type? Thanks! Link to comment Share on other sites More sharing options...
Guest Posted August 31, 2000 Share Posted August 31, 2000 I would wait on the $1k heads until you are ready for a full rebuild. I bought the th400 with the 3000 stall converter, works great in my skylark, should be even better in the riv.<BR>I would go with intake, cam, headers and carb and see where it gets you. Also a good time to look at the oil pump and timing chain. I went with the 2.5" exhaust system. It was a little cheaper. 3.42 gears with posi would be my rear choice. You can swap a gm HEI distributor from a later buick 350 (use the gear from the 455) or go with the Pertronix kit. both work well. Link to comment Share on other sites More sharing options...
Guest Posted September 7, 2000 Share Posted September 7, 2000 i think billy is right i would upgrade the heads to stage 1 valves and a little port work go to <A HREF="http://www.taperformance.com" TARGET=_blank>www.taperformance.com</A> and look at there 500 hp 455 buildup Link to comment Share on other sites More sharing options...
Guest Posted September 14, 2002 Share Posted September 14, 2002 JUST SO YA KNOW...IM RUNNING POLSTONS INTAKE,CAM# 116 I BELIEVE..WHICH IS MADE FOR YOUR RIVVY...HAS A SLIGHT ROUGHNESS IN IDLE ..AND THEIR 800 CFM MODIFIED CARB ON MY 455 WHICH I HAVE IN MY 76 REGAL...ALSO IS THE BLOCK IS OUT OF A 76 RIVVY ..THE HEADS ARE 1970 455'S....WITH 10 TO 1 COMPRESSION...I HAD IT PLACED ON THE DYNO....ITS A SLEEPER WHICH PEOPLE ARE IN AWW WHEN THEY HEAR IT OPEN UP...I RUN 3.23 GEARS AND A BEEFED UP 350 TRANSMISSION...POWER OUTPUT IS LOWER THAN THE NORMAL 11 TO 1 BUT...ITS 332 HP @ 4800 RPM WITH 429 FT LBS OF TORQUE...I DONT LOSE FROM A STOP OR HIGH RPMS...IS A WELL ACCELERATED VEHICLE THROUGH ALL THE GEARS...I DONT HAVE THE THUMP OF A BIG CAM...BUT SHE RUNS VERY NICE...HOPE'S THIS HELPS YOUR DECISION MAKING...BU_NUT76@YAHOO.COM Link to comment Share on other sites More sharing options...
Guest Posted September 16, 2002 Share Posted September 16, 2002 I Ported the heads, added an HEI, MSD 6AL box, a TA Performance Stage 2 Cheater cam, and a larger electric fuel pump for engine mods and added a 3.42 rear. All of that was good for almost 500hp off of the stock SF code heads with the small valves. I also added a 700R4 overdrive since its a driver so I can now get about 22 mpg on the highway.Laterz,Central Texas Sleeper"There is no Replacement for Displacement" Carroll Shelby1970 Riviera (468-4, 700R4) Link to comment Share on other sites More sharing options...
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