EngineSpecs

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: 1968 Pontiac 215 HP 250 L6

PONT-68 Issued: 7/1/1968 Last Revised: 1/1/2024 Revisions: 17 April 1995, 11 April 2000, 4/22/13 PC, 2/1/2021, 1/1/2024

Engine Family: General Motors, Pont L6 OHC Advertised Comp Ratio: 10.50:1 Induction: 1-4 Bbl Engine Type: L6

Basic Specs:	Bore	Stroke	Main Journal Dia	Rod Journal Dia	Max Bore	Max Stroke	Max Displacement
	3.875"	3.530"	2.300"	2.000"	3.955"	3.545"	261.3 ci

Piston-Rod Specs:	Piston Weight	Comp Height	Pin Weight	Rings	Rings Weight	Rod C/C	Max Rod C/C	Rod Weight	Min Assy Weight
	NA	NA	NA	NA	NA	5.700"	5.725"	NA	NA

Compression:	Deck Height	Head Gasket	Piston Type	Dome/Dish Vol	Dome/Dish Hgt	Comb Chamber Vol	Max Compression
	.014"	.021"	Flat w/notches	0 cc	0	55.0 cc	12.5:1

Valve Train:	Int Rocker Ratio	Exh Rocker Ratio	Intake Valve	Exhaust Valve	Lifter Type	Spring Type	Lifter Dia.
	1.50:1	1.50:1	1.923"	1.603"	Hydraulic	Outer & inner	0.000"

Camshaft:	Intake Lift	Exhaust Lift
	.449"	.449"

Cylinder Heads:	Casting No.		Intake Volume	Exhaust Volume
	9791195

Intake Manifolds:	Casting No.
	9791909	Cast Iron

Number	Manufacturer	Trans	Type	Primary Throttle	Secondary Throttle	Primary Venturi	Secondary Venturi
1901	Edelbrock	ALL	4-Bbl	1.375"	2.250"	1.108"	.000"	AV Secondary. Replacement for GM small venturi Quadrajets. NOTE: Venturi specs include .015" maximum allowable tolerance.
4MV-7028260	Rochester	Auto	4-Bbl	1.375"	2.250"	1.093"	.000"	Air valve secondary
4MV-7028261	Rochester	SM	4-Bbl	1.375"	2.250"	1.093"	.000"	Air valve secondary

Power Factors:	Stock Man		Stock Auto		S/S Man		S/S Auto
Base Factors	215		215		215		215

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: