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Posts Tagged ‘Buick 455’

Dave Hemker’s 70 GS “Sparty” Certified Stock

Tuesday, November 2nd, 2010

The engine for my car was put together to be certified stock.

Block 1972 stock bore 455, 4.3125

Crank turned .010, .010 by FinishLine Motorsports, stock 3.90 stroke

Pistons TRW forged stock replacement with the button in the center ground off, 23.5 cc dish

Rods Stock, resized

rotating assembly is balanced

Deck .041 deck height

Head Gaskets Steel Shim .020

Heads 1970 heads converted to Stage 1 by Finish Line Motorsports

NHRA minimum 55.5 cc chambers

NO porting, NO polishing, NO gasket matching

3 angle valve job with stock valve & seat angles

Compression Ratio 10.95

Intake manifold Stock 1970 intake

NO porting, NO polishing, NO gasket matching

NO cutting in the plenum area or anywhere else

Carb Stock Q-jet, 750 cfm

Air cleaner Stock 1970 GS air cleaner

Exhaust manifolds Stock manifolds, 2” outlet exit to the pipes

NO porting, NO polishing, NO gasket matching

Jet Hot coated

Exhaust system 2.5 “ mandrel bent to the bumper

X-pipe, StraightLine Performance oval case mufflers

Fuel Pump Stock Delco Stage 1 fuel pump

Ignition Stock distributor with Pertronix 1181 conversion and matching

Pertonix 40,000 volt coil, 7mm wires

Spark Plugs Autolite #25

Timing chain Stock silent chain, steel gears

Camshaft: Competition Components custom grind using Stage 1 cam specs

Lifters Hydraulic

Rocker arms Stock

Pushrods 5/16” adjustable


1970 GS, 3750 lbs with driver, full interior, bench seat, column shift, manual steering, manual disc brakes, no a/c, 3.73 12 bolt axle, turbo 400 with stock convertor.

Best et to date:

G-70-15 bias ply tires 12.53 @ 110+ with 1.95 60’

9x28x15 Goodyear slicks 12.43 @ 110+ with 1.85 60’


Update: Edelbrock E85 Buick Engine goes 10.35 @ 129.22

Sunday, October 31st, 2010

Congrats to Brian Sobczyk and his 72 Buick GS. On Saturady 10/30 at Milan dragway, he went 10.35 @ 129.22 MPH.

A full buildup on the car is here       The engine build up is here.

The car is street driven regularly in the Detroit area and weighs 3965lbs.


Doug and Nancy Cook’s Ten second ’69 Buick Skylark

Wednesday, October 27th, 2010

Lot’s of cars have interesting stories, and Doug and Nancy’s Skylark bracket car is no exception. In Doug’s words:

“I found this car on a used car lot around 1997.  It was rust free Texas car with a totally shot interior and a 350 with a rod knock.  I let my friend know and he went to look hoping to make a full race car out of it.  When he went the car was still there but he was told it was sold.  The next month I drive by and it’s still sitting there.  I call my friend who goes back and finds out someone put money down but never came back so he bought it for $800.  We drove it home with a rod knock about 5 miles expecting it to grenade.  We gutted the motor/trans/interior and let it sit.  A short time later a local machine shop gave us a rebuilt 73 455.  Someone dropped it off to be rebuilt many years ago and never picked it up.  Having a car and a motor sitting there we decided to build a “fun car”.  A local junk yard gave us a TH400, we built a 4.10 12 bolt chevy from a spare housing, used some old MT headers from the rafters, bought a performer intake, found an old 3310 Holley and threw it all together.  The best the car ran was 12.80’s with a total investment of about $1500.  I drove the car off and on for about 10 years, usually taking it to Buick races to have fun with.  3 years ago I bought the car from my friend and shortly afterwards I bought a 12-1 stage 1 engine and ran 11.70’s.”

Looking for better ET’s, Doug built the engine in the car now. It’s budget minded, but still uses good quality parts: The Block was machined by Bobb and Geof  at Finishline, and assembled by Doug. Wiseco Pistons were used, and swing on 6.635 BBC H beam rods. The cam is a custom flat tappet from Competition Components, 260 @ .050 on the intake side, and .600 lift with Comp Cams 1.6 Gold series rocker arms.  Heads are CNC Ported Edelbrock RPM’s with an upgrade to 7/16 rocker studs.  The intake is an SP1 single plane with an adapter to run a 9375 Dominator (1050). Improved oiling comes from a Finishline scavenger unit. Doug used some innovation and some spare parts for the ignition, using a stock buick distributor and converted it to electronics using a Mopar pickup and corresponding orange control box. Neat idea Doug. The converter is a 4000 RPM Coan unit, and the 12 Bolt houses 4.10 gears. Exhaust consists of 2″ Headers and 3 1/2″ pipes and Dynomax bullet mufflers. Best ET so far is 10.60 @ 127+ mph. The skylark weighs in at 3500lbs. Oh, and the other cool thing? Nancy is Doug’s sister in law and  shares the driving duties on the blue Buick! Here’s a video of the car in action