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1939-53 Flathead Ford Rotating Assembly, 286 C.I.

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Specs
Sold in Quantity:
Kit
Rod Journal Diameter:
2.00"
Piston Style:
Flat Top
Connecting Rod Type:
H-Beam
Stroke:
4.125
1939-53 Flathead Ford Rotating Assembly, 286 C.I.
1939-53 Flathead Ford Rotating Assembly, 286 C.I.
1939-53 Flathead Ford Rotating Assembly, 286 C.I.

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Please note the following about this product:

  • This item is sold as a kit.

Details

Reviews (1)

Q & A (6)

What's in the Box

Info

These 1939-53 flathead stroker kit rotating assemblies feature new Scat crankshafts, new Scat H-beam connecting rods with 2" journals, Ross forged three-ring pistons, rod bearings, and piston rings. The components are balanced and ready for you to assemble.

Main bearings sold separately. If you have a 39-48 engine you will need a set of 9101535-STD main bearings. A 49-53 engine will require a set of 9101536-STD main bearings.

Item Details

3-5/16" bore
4-1/8" stroke

Customer Reviews

Rated 5 out of 5 by 1 reviewers.
RATING BREAKDOWN
1 reviews
5 Stars
1
4 Stars
0
3 Stars
0
2 Stars
0
1 Star
0
RECOMMEND THIS PRODUCT:

sjarnecke
Davenport, IA, USA

Where else .....!

January 03, 2014
have not fired yet ... but this rotating assembly kit is exactly what I needed and saved tons of time and money. Thanks Speedway!!!
Pros:
  • ready and available in 24 hours!
Yes, I recommend this product.
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Page 1 of 1

Product Q&A

6 questions : 7 answers

2 answers

Sorry I am from South Africa, 5/16 bore? does that mean my bore would be 3,3125 inch or 125 thou over standard?

Runflat
February 20, 2015

Sorry I am from South Africa, 5/16 bore? does that mean my bore would be 3,3125 inch or 125 thou over standard?

Answers

May 16, 2016
wink
yes, your bore will be 3.3125 which is .1250 over standard.
February 20, 2015
EricM
Yes the pistons are for 3.3125" bore.
1 answers

What type of piston rings come with this kit? Metric moly rings or standard?

bored&stroked
May 31, 2015

What type of piston rings come with this kit? Metric moly rings or standard?

Answers

June 01, 2015
Eric
Expert
Yes 3 5/16" is 3.3125" when expressed as a decimal.
1 answers

Hi! I am rebuilding a 1933 Ford Four Door with a 21 stud flathead. It should be from 1935 or 1936 water pumps mounted in the heads. Is this kit also for my engine avaible? thanks Bernhard

Bernhard Steiner
Vienna (Austria)
September 25, 2015

Hi! I am rebuilding a 1933 Ford Four Door with a 21 stud flathead. It should be from 1935 or 1936 water pumps mounted in the heads. Is this kit also for my engine avaible? thanks Bernhard

Answers

September 25, 2015
Eric
Expert
This rotating assembly will not work with your 1933 Flathead because until 1939 they did not use insert bearings in the Flatheads. This is for blocks that use insert bearings rather than the poured "babbit" main bearings.
1 answers

What compression ratio is this kit designed for?

Bbymike
December 01, 2015

What compression ratio is this kit designed for?

Answers

December 02, 2015
Eric
Expert
This kit has 9.7 to 1 compression with 74 cc heads.
1 answers

Are the rod bearings "full floating" as in stock 39 to 48 flathead? Is any block or pan mod needed to clear the 4.125" stroke. This engine is going into a 1941 Ford which uses a crank mounted fan. Will this crank accept the '41 crank pulley with the fan attached? About two years ago there were some complaints about SCAT cranks being delivered way out of balance. This kit is advertised as balanced rotating assembly. Is it? And if so to what specifications for pistons, rods, crank? Does the SCAT crank have the trash collecting galleys that stock cranks have? Important because I will not be using an oil filter. What is the lead time for delivery?

DaveR
Williamsburg, VA
September 23, 2016

Are the rod bearings "full floating" as in stock 39 to 48 flathead? Is any block or pan mod needed to clear the 4.125" stroke. This engine is going into a 1941 Ford which uses a crank mounted fan. Will this crank accept the '41 crank pulley with the fan attached? About two years ago there were some complaints about SCAT cranks being delivered way out of balance. This kit is advertised as balanced rotating assembly. Is it? And if so to what specifications for pistons, rods, crank? Does the SCAT crank have the trash collecting galleys that stock cranks have? Important because I will not be using an oil filter. What is the lead time for delivery?

Answers

September 30, 2016
John
Expert
This crank kit uses the 39-48 main bearings in the insert type configuration if putting in that series of block or 49-53 style if installing in that years of block. The crank mounted accessories should still work. Exact specifications currently not advertised but there has been no complaints on the balancing. The crank has updated design to eliminate oil hangup in various places and we normally have these kits in stock for same day shipping.
1 answers

When this assembly is fitted with Edelbrock heads, should the 65cc or the 74cc chambers be chosen for reliable road use? Thankk you for your help.

Flatty
November 01, 2016

When this assembly is fitted with Edelbrock heads, should the 65cc or the 74cc chambers be chosen for reliable road use? Thankk you for your help.

Answers

November 02, 2016
Eric
Expert
This kit will get you 9.7 to 1 compression with 74cc combustion chambers. The 65cc chambers will make too much compression and are not recommended with this kit unless you plan to use high octane racing fuel.
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