Expanded Blueprint Specs:

  • The first thing you will notice is a whole lot more data than you get from the NHRA Tech Bulletins pages. That is why individual engines are shown rather than every available engine for the year-make.
  • The additional data that is not included on the NHRA Tech Bulletins pages is not authorized or approved by NHRA so do not assume that this has the same authority in those areas as the information on the official NHRA Technical Bulletins. The data from the NHRA web Technical Bulletins is included here and every effort is made to ensure that this data is the most up to date information published by NHRA.
  • An interesting tool is the link on the right side of the page to show all the cars that use the engine you have selected. You will find that information valuable in considering options for class placement for this engine.
  • You will find all the relavent information from NHRA for accepted replacement parts - pistons, rods, oil pans, etc. - is all located in this one page. You do not have to look anywhere else to find that information.

Engine Blueprint Specifications:  1977 Pontiac 180 HP 400 V8

PONT-77      Issued: 5/20/1977      Last Revised: 2/3/2011      Revisions: 25 July 1980, 27 Aug 1987, 21 Nov 1994, 1-5-96, 5-23-96, 4-3-97, 4-29-97, 1-20-2004, 4-14-06 WR, 2-6-08 WR, 2/3/11 PC, 01-01-2021

Engine Family:   General Motors, Pont V8 Late         Advertised Comp Ratio:   8.56:1         Induction:   1-4 Bbl         Engine Type:   V8

Basic Specs:BoreStrokeMain Journal DiaRod Journal DiaMax BoreMax StrokeMax Displacement
 4.125"3.750"3.000"2.250"4.205"3.765"418.3 ci

Piston-Rod Specs:Piston WeightComp HeightPin WeightRingsRings WeightRod C/CMax Rod C/CRod WeightMin Assy Weight
 551 g1.695"90 g5/64, 5/64, 3/1657 g6.625"6.650"760 g1458 g

Compression:Deck HeightHead GasketPiston TypeDome/Dish VolDome/Dish HgtComb Chamber VolMax Compression
 .004" AB.043"Flat w/notches0 cc089.06 cc9.75:1

Valve Train:Int Rocker RatioExh Rocker RatioIntake ValveExhaust ValveLifter TypeSpring TypeLifter Dia.
 1.50:11.50:12.113"1.663"HydOuter & inner0.842"

Camshaft:Intake LiftExhaust Lift 

Cylinder Heads:Casting No. Intake VolumeExhaust Volume  

Intake Manifolds:Casting No. 
 100003395Cast Iron
 525355Cast Iron

Carburetors:NumberManufacturerTransTypePrimary ThrottleSecondary ThrottlePrimary VenturiSecondary Venturi 
 17057263RochesterSM4-Bbl1.375"2.250"1.218".000"Air valve secondary
 17057274RochesterAuto4-Bbl1.375"2.250"1.218".000"Air valve secondary
 1903EdelbrockALL4-Bbl1.375"2.250"1.233".000"AV Secondary. Replacement for GM large venturi Quadrajet. NOTE: Venturi specs include .015" maximum allowable tolerance.

Power Factors:Stock Man Stock Auto S/S Man S/S Auto GT Man GT Auto GTFwd Man GTFwd Auto 
Base Factors2601/1/112601/1/11285 285 285 2891/1/07285 2891/1/07
Exception: Firebird28311/25/0328311/25/03            

Accepted Replacement Pistons for Stock Eliminator

   Effective 10/6/2020
Specs:     Comp Hgt-1.695"    Pin Dia-0.980"    Rings-5/64, 5/64, 3/16   
Distance to Top Ring-0.320"    Piston Min Weight-551g

Manufacturer Part Number
Barton 67-79 Pontiac 400
CP Pistons P1-CP
JE 295647
JE 30420
NAPA 1670
Ross 66045
Speed Pro 2227P
TRW L2262
TRW L2440
Venolia 400

Accepted Replacement Oil Pans for Stock Eliminator

Engine Group - Pont V8 Late           Effective 7/3/2019

Manufacturer Part Number
Milodon 30770
Moroso 20492

Accepted Replacement Blocks

Manufacturer Part Number
K&M Performance MR-1
All Pontiac APSJB

Accepted Replacement Connecting Rods for Stock or S/S

    Effective 12/1/2021
Specs:     C/C Length- 6.625"    Min Weight- 760g    Journal Dia- 2.249"    Big End Dia- 2.375"    Pin Dia- 0.980"

Manufacturer Part Number C/C Length Wgt. Pin Dia.
Carrillo C427-76635S 6.625" 834g 0.990" Pontiac
Carrillo C427-A76635H 6.625" 787g 0.990" Pontiac **Discontinued**
Carrillo P-455-SS 6.631" 760g NA SUPER STOCK ONLY
Childs & Albert 389-12 6.625" NA 0.947" Pontiac
Crower F91059 6.625" NA 0.981" Pontiac
Crower ML93015B5 6.624" 773g NA SUPER STOCK ONLY
Crower SP93419 6.625" 830g 0.947" Pontiac
Eagle CRS-6625P3D 6.625" 760g 0.947" Pontiac
Eagle CRS-6635P 6.635" 810g 0.990" BB Chev
Manley 14168 6.635" 830g 0.990" BB Chev
Oliver ORPPONT6625 6.625" NA 0.981" Pontiac
Oliver P6225PONT 6.625" 790g 0.980" Pontiac
Oliver P6625PONTFR8 6.625" 819g 0.980" Pontiac

Note the calculations for actual displacement the maximum actual compression ratio.

Would you like to see a list of all the cars where this engine is used? Click here:

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