Flo-Tek 203505 Small Block Ford Aluminum Cylinder Head

#7223000

Flo-Tek 203505 Small Block Ford Aluminum Cylinder Head

Name: Flo-Tek 203505 Small Block Ford Aluminum Cylinder Head
Brand: Flo-Tek
SKU: 7223000
Price: 447.99 USD
Availability: InStock
Rating: 4.4 (36 reviews)

Flo-Tek

36 Reviews

45 Questions

Features hardened locks and retainers
Head is compatible with most roller camshafts
Includes high-temp exhaust seats and bronze guides

$447.99

each

In Stock

Add to a list

Select a vehicle to verify Fitment

Select Vehicle

Product Summary

289, 302, 351W, Assembled Cylinder Head Style, Aluminum

Features hardened locks and retainers
Head is compatible with most roller camshafts
Includes high-temp exhaust seats and bronze guides
Made from lightweight, yet strong aluminum with a natural finish
Intake valve diameter measures 1.940" and the exhaust valve diameter measures 1.540"

See more details

Key Specs

Cylinder Head Style	Assembled
Material Type	Aluminum
Finish	Natural
Combustion Chamber Volume	58cc
Intake Runner Volume	180cc

See more specs

Need To Know

This Product Will Ship Free

Shipping Policies & FAQs

Need help?

855.313.9176

View the Help Center

Quick and Easy Returns

Return Policy

Installation Details

Installation Tips

These Flo-tek aluminum heads are the answer to the performance enthusiast and work on the small block Fords including the later EFI series when used in conjunction with an aftermarket intake, carb, and camshaft. Aluminum heads allow for a higher compression ratio than cast heads without creating pre-ignition problems. Check your piston usage with the 58cc combustion chamber for accurate ratio computation.
If using the heads on a 289 or 302 the upper row is 80 pounds net and the lower is 70 pounds. Torqued in stock sequence and increments. If using on the 351 with the larger bolts it is 100 pounds net torque in same sequence and increments as stock.
The head uses 3/8 rocker studs 915-99156 and requires the use of adjustable rocker arms like our part number: 915-11772. You will need to check your push rod length to determine the correct length before ordering pushrods.
Depending on the how much extra lift you are going to go with, you may also need different valve spring retainers that allow for more valve spring installed height
289 and 302 engines with 7/16” head bolts use 1012543708. 351W engine with ½” head bolts use 590HBK35100.
These Flo-Tek aluminum heads for the small block Ford are specified to take plug number NGKR5671 or Autolite AR3932
Valve springs are suitable for most hydraulic flat tappet and mild street hydraulic roller camshafts

Have a Question?

Talk with one of our experts!

Call Us - 1.855.313.9176

Details

You don't need to spend a fortune to get a top-performing, lightweight aluminum cylinder head for your small-block Ford V8. This Flo-Tek head has a long list of high-end features, minus the hefty price tag.

Will likely need to plug the EGR connection holes in the end of these heads on 86-up fords. Please use 5775804 to do so. One set of plugs will do a pair of heads.

Head is sold individually
180cc intake runners
62cc exhaust runners
1.94" intake and 1.54" swirl-polished exhaust valves
58cc chambers
Performance valve springs (.550 lift)
130 lbs. spring seat pressure
Compatible with most roller camshafts
Hardened locks and retainers
PC seals
High-temp exhaust seats
Multi angle valve job
Bronze guides
3/8" rocker studs and guide plates

See how this Flo-Tek head stacks up against the competition in Car Craft Magazine's tech article; 6 Small Block Ford Cylinder Heads That Work.

Head Flow Specs:

Lift Intake Exhaust
.400 209 137
.500 223 161
.600 248 191

Application

Recommended Spark Plug: NGKR5671 or Autolite AR3932
Valve Spring Type: Single w/ Damper
Valve Spring Application: Roller
Valve Spring Diameter: 1.465" O.D.
Valve Spring Seat Pressure: 115 lbs.
Valve Spring Rate: 240 lbs/in.
Max lift: 0.550"
Intake Valve: 1.94"
Exhaust Valve: 1.54"
Valve Type: Stainless, Swirl-Polished
Air Flow Data:
- Intake
  - 223 CFM @ .500"
  - 248 CFM @ .600"
- Exhaust
  - 161 CFM @ .500"
  - 191 CFM @ .600"

Specs

Recommended Spark Plug: NGKR5671 or Autolite AR3932
Valve Spring Type: Single w/ Damper
Valve Spring Application: Hydraulic & Solid Flat Tappet
Valve Spring Diameter: 1.465" O.D.
Valve Spring Seat Pressure: 130 lbs.
Valve Spring Rate: 280 lbs/in.
Intake Valve: 1.94"
Exhaust Valve: 1.54"
Valve Type: Stainless, Swirl-Polished
Air Flow Data:
- Intake
  - 223 CFM @ .500"
  - 248 CFM @ .600"
- Exhaust
  - 161 CFM @ .500"
  - 191 CFM @ .600"

CARB Warning

For race/ off road use or for use on pre-1966 vehicles.

Emissions warning: this part only legal for sale or use in California for racing (competition) vehicles which may never be used, registered, or licensed for use upon a public highway, or if installed in vehicles model-year 1965 or older; motorcycles model-year 1977 or older; or off-highway recreational vehicles (such as off-road motorcycles and all-terrain vehicles) model-year 1996 and older. Any other use renders the vehicle tampered and not legal for use on California public highways (any public street or roadway, public dirt road, public park, or publicly maintained right of way open to the use of the public for vehicular travel). Violations subject to $37,500 penalty per violation per vehicle, revocation of registration, loss of use on California public right of ways, and proof of correction for tampering. There are similar restrictions and penalties under federal law and the laws of all other states with penalties under federal law of up to approximately $45,268 per tampered vehicle and/or engine.

CA Prop 65

CARB warning

Specifications

KEY SPECS
MFG. Part #	203505
Brand	Flo-Tek
Cylinder Head Style	Assembled
Material Type	Aluminum
Finish	Natural
Combustion Chamber Volume	58cc
Intake Runner Volume	180cc

GENERAL
Exhaust Runner Volume	62cc
Combustion Chamber Volume Range	50cc - 59cc
Intake Runner Volume Range	180cc - 189cc
Exhaust Runner Volume Range	60cc - 69cc
Spark Plug Style	Angle
Intake Valve Diameter	1.94"
Exhaust Valve Diameter	1.54"
Spring Diameter	1.47"
Notes	Recommended Spark Plug: NGKR5671 or Autolite AR3932 . Bored for 1/2" head bolts.
Sold in Quantity	Each