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Manley Performance Manley Chevy LT-1 1.590 Head Diameter Pro Flo Exhaust Valves (Set of 8)
Manley Performance Manley Chevy LT-1 1.590 Head Diameter Pro Flo Exhaust Valves (Set of 8)
Manley Performance Manley Chevy LT-1 1.590 Head Diameter Pro Flo Exhaust Valves (Set of 8)
Manley Performance Manley Chevy LT-1 1.590 Head Diameter Pro Flo Exhaust Valves (Set of 8)
Manley Performance Manley Chevy LT-1 1.590 Head Diameter Pro Flo Exhaust Valves (Set of 8)
Manley Performance Manley Chevy LT-1 1.590 Head Diameter Pro Flo Exhaust Valves (Set of 8)
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Manley Chevy LT-1 1.590 Head Diameter Pro Flo Exhaust Valves (Set of 8)

MAN12349-8
807298086057
Valves
Out of stock
$ 685.44 $ 514.08

SKU: 12349-8 | UPC: 807298086057

Manley Chevy LT-1 1.590 Head Diameter Pro Flo Exhaust Valves (Set of 8) 1969-1982 Small Block Chevy LT1 Heads

Manley Pro Flo exhaust valves deliver high-flow performance for Chevy Small Block LT1 cylinder heads found on 1969-1982 Camaro Corvette and other models. This set of 8 valves with 1.590 inch head diameter suits Top Fuel Funny Car drag racers Big Block Chevy marine setups and Small Block Chevy circle track engines with restricted carbs. Engineered with swirl polishing these valves increase exhaust flow while handling extreme duty conditions.

Key Features

  • Swirl Polished Design: Computer controlled process adds 10 percent more exhaust flow compared to standard polished valves for better engine breathing and power
  • Undercut Stem Tip: Proprietary Manley tip design reduces valve guide wear and friction during high RPM operation
  • Stainless Steel Construction: Extreme duty XH-426 stainless steel withstands heat and stress in racing and marine environments
  • Precise Dimensions: 1.590 inch head diameter 4.910 inch length 11/32 inch stem and 0.080 inch margin ensure drop-in fit for LT1 heads
  • Set of Eight: Complete exhaust valve kit covers one V8 engine for full performance upgrade

Product Notes

  • Inspect cylinder head valve seats and guides before installation
  • Apply valve seat compound during break-in for longest life
  • Special order item expect 3-5 business days processing time

Installation Notes

  • Professional installation recommended.
  • Valve job required to match swirl polished profile and margins
  • Compatible with stock LT1 head hardware and aftermarket springs up to 180 lbs seat pressure

This Part Fits

Year Make Model Submodel
1969 Chevrolet Camaro Z28
1970 Chevrolet Camaro Z28
1970-1972 Chevrolet Corvette LT1
1971-1972 Chevrolet Camaro Z28
1963-1982 Chevrolet Small Block LT1 Heads

Why Choose Manley?

  • Trusted by Top Fuel and Funny Car teams for proven racing results
  • Valves built to endure high heat and RPM in competition engines
  • Precision machined in USA for exact tolerances and reliability

Frequently Asked Questions

  • Q: Which cylinder heads are compatible with these valves?
    A: Designed for Chevrolet Small Block LT1 heads casting numbers 336299 487399 or equivalent aftermarket LT1 heads on 1969-1982 engines
  • Q: What material are these valves made from?
    A: High strength XH-426 stainless steel alloy for superior heat resistance and durability in extreme applications
  • Q: What is the warranty on Manley valves?
    A: Limited lifetime warranty against manufacturing defects when installed by certified engine builder

Shipping & Handling

  • Method: UPS Ground
  • Availability: In stock - ships same or next business day
  • Packaging: Protective cardboard box 7 x 4 x 2 inches
  • Weight: 1.1 lbs

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