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: 1970 Chevrolet 250 HP 350 V8

CHEV-70 Issued: 3/23/1970 Last Revised: 1/1/2022 Revisions: 4-8-70,5-15-70,7-15-78,4-27-98,12-01-98,2-4-05,5-3-05,11-10-05 WR,12-8-05 CL,1-26-06 WR 4-26-06 WR, 1-17-07 WR, 2-23-07 WR, 6-11-08 WR, 1-1-09 WR, 7/10/12 PC, 2-6-2020, 3-26-2020, 1-12-2021, 1-27-2021, 1-1-2022

Engine Family: General Motors, Chev V8 Small Block Advertised Comp Ratio: 9.00:1 Induction: 1-2 Bbl Engine Type: V8

Basic Specs:	Bore	Stroke	Main Journal Dia	Rod Journal Dia	Max Bore	Max Stroke	Max Displacement
	4.001"	3.484"	2.450"	2.100"	4.081"	3.499"	366.1 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
	547 g	1.535"	80 g	5/64, 5/64, 3/16	50 g	5.700"	5.725"	550 g	1227 g

Compression:	Deck Height	Head Gasket	Piston Type	Dome/Dish Vol	Dome/Dish Hgt	Comb Chamber Vol	Max Compression
	.002"	.018"	Flat w/notches	-4.70 cc	0	63.3 cc	11.08:1

Valve Train:	Int Rocker Ratio	Exh Rocker Ratio	Intake Valve	Exhaust Valve	Lifter Type	Spring Type	Lifter Dia.
	1.50:1	1.50:1	1.945"	1.505"	Hyd	Outer w/damper	0.842"

Camshaft:	Intake Lift	Exhaust Lift
	.390"	.410"

Cylinder Heads:	Casting No.	Intake Volume	Exhaust Volume
	3932441	161.0cc	65.0cc
Dart	10021070	172.0cc	65.0cc	Same runner cc's, chamber cc's, valve sizes as the OEM head being replaced, intake & exhaust.
Dart	10220010	172.0cc	65.0cc	Same runner cc's, chamber cc's, valve sizes as the OEM head being replaced, intake & exhaust.
Edelbrock	60637	172.0cc	65.0cc	Same runner cc's, chamber cc's, valve sizes as the OEM head being replaced, intake & exhaust. SS only.
Edelbrock	60887	172.0cc	65.0cc	Same runner cc's, chamber cc's, valve sizes as the OEM head being replaced, intake & exhaust. SS only.
RHS	12400	172.0cc	65.0cc	Same runner cc's, chamber cc's, valve sizes as the OEM head being replaced, intake & exhaust. SS only
RHS	12402	172.0cc	65.0cc	Same runner cc's, chamber cc's, valve sizes as the OEM head being replaced, intake & exhaust. SS only
World Products	043600	172.0cc	65.0cc	Same runner cc's, chamber cc's, valve sizes as the OEM head being replaced, intake & exhaust. SS only
World Products	043610	172.0cc	65.0cc	Same runner cc's, chamber cc's, valve sizes as the OEM head being replaced, intake & exhaust. SS only

Intake Manifolds:	Casting No.
	3916313	Cast Iron

Number	Manufacturer	Trans	Type	Primary Throttle	Primary Venturi
2MV-7040113	Rochester	SM	2-Bbl	1.686"	1.375"
2GU-7040114	Rochester	Auto	2-Bbl	1.686"	1.375"
2GU-7040115	Rochester	SM	2-Bbl	1.686"	1.375"
2GU-7040116	Rochester	Auto	2-Bbl	1.686"	1.375"

Power Factors:	Stock Man		Stock Auto		S/S Man		S/S Auto		GT Man		GT Auto		GTFwd Man		GTFwd Auto
Base Factors	230	12/18/02	230	12/18/02	230		230		230		233	7/22/09	230		233	7/22/09
w/Rep Heads: RHS 12400 , 12402; World Prod 043600, 043610; Edelbrock 60887, 60637	235	1/1/18	235	1/1/18	235	4/2/13	235	4/2/13	235	4/2/13	238	4/2/13	235	4/2/13	238	4/2/13
Exception: Camaro	224	1/1/14	224	1/1/14
w/Rep Heads:	229	1/1/18	229	1/1/18
Exception: Chevy II	224	1/1/14	224	1/1/14
w/Rep Heads:	229	1/1/18	229	1/1/18

Accepted Replacement Pistons for Stock Eliminator

   Effective 4/30/2024
Specs:     Comp Hgt-1.535"    Pin Dia-0.927"    Rings-5/64, 5/64, 3/16
Distance to Top Ring-0.235"    Piston Min Weight-547g

Manufacturer	Part Number

Badger

P557

CP Pistons

C6-CP

Diamond

CV350

Federal-Mogul

345NP

139904

Lunati

350

Ross

99579

Sealed Power

2244P

TRW

L2256F

TRW

L3022F

Venolia

350

Accepted Replacement Oil Pans for Stock Eliminator

Engine Group - Chev V8 Small Block Effective 5/10/2022

Manufacturer	Part Number

Champ Pans

CP40

Milodon

30401

Milodon

30700

Milodon

30701

Milodon

30702

Milodon

31060

Chevy II

Milodon

31501

Milodon

31502

Milodon

31503

Moroso

20180

Moroso

20181

Moroso

20182

Moroso

20211

Chevy II

Moroso

20230

75-79 Monza

Moroso

21804

Moroso

21807

Moroso

21808

Accepted Aftermarket Crankshafts

Manufacturer	Part Number

Scat

9-10526

Chevy SB 350

Scat

4-350-3480-5700-L

Chevy SB 350

Scat

9-35010

Chevy SB 350

Eagle

103503480

Chevy SB 350

Callies

SAF-113-CM

Chevy SB 305-350

Scat

4-350-3480-5700

Chevy SB 350

Accepted Replacement Blocks

Manufacturer	Part Number

Dart

Little M - 31131111

Dart

SHP31161111

World Products

84010

10051183

Spacers allowed in Stock.

GM Performance Parts

12480047

Dart

Little M - 31138111

GM Performance

12480174

302, 327, 350

World Products

084110

4" bore 4.00 Bore

World Products

084130

4.120" bore 4.120 Bore

World Products

084030

4.120" bore 4.120 Bore

Dart

31161411

4.125

10051183

BowTie Block. Crankshaft spacers permitted.

Accepted Replacement Connecting Rods for Stock or S/S

Effective 8/23/2023
Specs: C/C Length- 5.700" Min Weight- 550g Journal Dia- 2.100" Big End Dia- 2.225" Pin Dia- 0.927"

Manufacturer	Part Number	C/C Length	Wgt.	Pin Dia.

Callies

CIA-1

5.700"

Callies

CSA5700CS2A2AH

5.706"

579g

0.927"

SB Chevy Small Journal

Callies

CSA5700DS2A2AH

5.700"

606g

0.927"

SB Chevy Large Journal

Carrillo

BC20-57071

5.700"

629g

0.927"

SUPER STOCK ONLY

Carrillo

C350-65700

5.700"

627g

0.927"

SB Chev Large Journal

Carrillo

C350-75700

5.700"

688g

0.927"

SB Chev Large Journal

Carrillo

C35-A75700

5.700"

627g

0.927"

SB Chev Large Journal **Discontinued**

Carrillo

C-QD47-65700

5.700"

574g

0.927"

SUPER STOCK ONLY

CAT

CRS-5700

5.700"

649g

0.927"

SB Chevy Large Journal

CAT

CRS-5700S

5.700"

692g

0.927"

SB Chevy Small Journal

Childs & Albert

327-03 LW

5.700"

622g

0.927"

SB Chev Small Journal

Childs & Albert

350-12 LW

5.700"

0.927"

SB Chev Large Journal

Crower

B93005

5.700"

710g

0.927"

SB Chev Large Journal

Crower

CR 5700

5.700"

587g

0.927"

SB Chev Large Journal

Crower

LW93005

5.700"

605g

0.927"

SB Chev Large Journal

Crower

M93005

5.700"

660g

0.927"

SB Chev Large Journal

Crower

ML93000B3

5.706"

556g

0.927"

SB Chevy Small Journal

Crower

ML93005B3

5.704"

559g

0.927"

SB Chevy Large Journal

Crower

ML93902B3

5.700"

550g

SUPER STOCK ONLY

Crower

SP91205

5.700"

595g

0.927"

SB Chev Large Journal

Crower

SP93200B

5.702"

599g

0.927"

SB Chevy Small Journal

Crower

SSP93300B

5.704"

588g

0.927"

SB Chevy Small Journal

Eagle

CRS-5700B

5.700"

630g

0.927"

SB Chev Large Journal

Eagle

CRS-5700B3D

5.700"

630g

0.927"

SB Chev Large Journal

Eagle

CRS-5700S3D

5.700"

655g

0.927"

SB Chev Small Journal

Eagle

SCR5700BB

5.700"

561g

0.927"

SB Chevy Large Journal

Eagle

SCR5700BP

5.700"

550g

0.927"

SB Chevy Large Journal

CH5700ALLB1

5.700"

678g

0.927"

SB Chev Large Journal

CH5700AZYB-SS8-A

5.700"

557g

SUPER STOCK ONLY

Lunati

5.700"

600g

0.927"

SB Chev Large Journal

Lunati

LAA1

5.700"

600g

0.927"

SB Chev Large Journal

Lunati

LHA1

5.700"

588g

0.927"

SB Chev Large Journal

Lunati

LHAF

5.700"

600g

0.927"

SB Chev Large Journal

Manley

14050

5.700"

685g

0.927"

SB Chev Large Journal

Manley

14101

5.700"

555g

0.927"

SB Chev Large Journal

Manley

14104

5.700"

570g

0.875"

SB Chev Large Journal

Manley

14105

5.700"

571g

0.927"

SB Chev Small Journal

Manley

14108

5.700"

579g

0.875"

SB Chev Small Journal

Manley

14109

5.700"

568g

0.927"

SB Chev Small Journal

Manley

14112

5.700"

564g

0.927"

SB Chev Large Journal

Manley

14150

5.700"

655g

0.927"

SB Chev Large Journal

Manley

14201

5.700"

580g

0.927"

SB Chev Large Journal

Manley

14350

5.700"

599g

0.927"

SB Chev Large Journal

Manley

14440

5.700"

550g

0.875"

SB Chev Small Journal

Manley

14441

5.700"

550g

0.875"

SB Chev Large Journal

Manley

14450

5.700"

597g

0.927"

SB Chev Small Journal

Molnar Technologies

CH5700GAEB-SS8-A

5.700"

560g

SUPER STOCK ONLY

Molnar Technologies

CH5700NLB-M8-A

5.700"

557g

0.927"

SB Chev Large Journal

Oliver

C5700 SMSL

5.701"

551g

0.927"

SB Chevy Small Journal

Oliver

C5700 SMUL-3.8

5.700"

568g

0.927"

SB Chevy Small Journal

Oliver

C5700 SPT8

5.706"

610g

0.932"

SB Chevy Large Journal

Oliver

C5700SMLT8

5.700"

632g

0.927"

SB Chevy Small Journal

Oliver

C5700STFR8

5.700"

676g

0.927"

SB Chevy Large Journal

Oliver

C5700STLT8

5.700"

648g

0.927"

SB Chevy Large Journal

Oliver

C5700STSL

5.700"

541g

0.927"

SB Chevy Large Journal

Oliver

C5700STUL

5.700"

602g

0.927"

SB Chevy Large Journal

Oliver

ORP5700

5.700"

656g

0.927"

SB Chev Large Journal

Saenz

IV 9574

5.700"

SCAT

2-ICR5700P

5.700"

597g

0.927"

SB Chevy Large Journal

Summit

SES-3-60L05B570

5.700"

550g

0.927"

SB Chev Large Journal

Summit

SES-3-60L05B578

5.700"

655g

0.875"

SB Chev Large Journal

Trick Flow Specialties

TFS-36570200

5.700"

Trick Flow Specialties

TFS-36570201

5.700"

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

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