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Old 05-16-2004, 10:16 PM
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Buick 455 Build Up

Whats up guys ive got a 68 Buick Gran Sport im restoring (ill post some pics later) and this winter im going to be doing a mild to slightly radical engine buildup on my 455, i know that the Buick engines arent exactly popular but i like to be different and even though my 455 has some miles on her shes impressed me very much ok here is what my buildup will consist of:

Buick 455 factory block bored .040 over = 4.3525 boreX3.90 stroke

Pistons are high speed cast pistons from TA performance 10.1:1 compression ratio

Camshaft TA performance cam grind # TA413 specs: lift with 1.6 ratio rockers .516 intake .516 exhaust Dur @ .050 .234 intake .244 exhaust Adv dur .286 intake .296 exhaust lobe seperation 113 degrees rpm range 2,000-6,000

Roller Shaft Mounted Rocker Arms by TA Performance 1.6 ratio

Cylinder heads are Stage 1 buick reproduction cast iron heads by TA performance Rectangular Ports

Intake is single plain design SP1 by TA performance, performance numbers are close to Victor JR. style intake

Stock HEI ignition with flame thrower coil, 850 Cfm holley carb

Headers TA Performance headers 2 inch mandrel bent primaries 3 1/2 collectors 3 inch madrel bent exhaust borla XR1 racing mufflers

Car has TH400 trans 2,000 staurday night special stall 3.90:1 gear ratio positive traction

What kind of performance #'s am i looking at here guys? im not looking for anything astonishing, but a factory 70 model 455 had 360 HP and 500+ torque so i didnt think i was being a dreamer looking for 420 HP out of this buildup, let me know that you guys think, thanks for your time.

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Old 05-17-2004, 08:47 PM
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None of you guys have any input on this topic?
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Old 05-17-2004, 10:49 PM
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There's a local '70 or '71 GS 455 Stage One that's stock except for headers, aluminum intake, & switch-pitch T400. It runs high 12's through the mufflers ("Hemi" Super Turbos, I believe). It ran 12.20 uncorked & on slicks.
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Old 05-17-2004, 11:21 PM
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Only thing might be to go with a little looser converter. I would think it would like something around 2400-2600 RPM with that cam. But if you don't plan on running slicks, the tighter converter might help kill off excessive wheelspin. Sounds like a high 11 second ride as long as you keep the weight down.
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Old 05-18-2004, 05:31 AM
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I agree with lust4speed and get a different convertor. The guys at T/A know what their doing with the 455 and this will be an awesome machine. The 455 was the king of torque and this will be one quick ride with the parts you have chosen. One suggestion though if you take it to the track use a 28in tall slick with the gears you have to keep from overwinding it. Buicks usually produce most of their power before 5400. This is a good choice as far as power for your 68 and will be a rocket on the street, just make sure you have your seats bolted down real well as this is going to tear your head off when you hit it. Good luck.
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