What is the difference in these and the 529-16 they seem to fit the same guides but are twice the price

The 529-16 seal has a bigger body OD than the 518-16 seal. These are used for single and dual spring applications, the 518-16 seal is used for triple spring applications and has a smaller body (.575" OD).

Do I need intake or exhaust seals or will this set work for both chevy 350

The 518-16 is designed for 11/32" valve stems and cylinder heads with a 0.530" outside diameter valve guide. If your SBC fits these specs, then you're good. Keep in mind that the outer diameter of this seal is 0.575", so make sure this clears the inside diameter of your valve springs.

Will 518-16 valve seals fit ford 5.0 engine

After installing they Lasted for about a Month, replaced them with Felpro valve seals

Will these fit work with factory valves in tbi heads or not?

You will need to machine the top of the cylinder head valve guide with a special .530 diameter cutter to fit these type seals over the valve guide boss. These are an upgrade over the stock o-ring type valve seals and are used in high performance applications and work very well when installed correctly, usually installed when your heads are being reworked or rebuilt you can request to have these very good quality type seals installed by your local engine machine shop. Designed for 11/32" diameter valve stems. Hope this helps!

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Viton Metal Valve Seals 11/32 by COMP Cams

Product ID: 13649300

Details

Material
Viton
Nominal Inside Diameter
0.53 Inches
Item Diameter
0.53 Inches
Brand
Comp Cams
Color
Silver

🔥High-temp Viton material

⚙️Optimized clearance design

🛠️Precision-machined fit

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Description

⚡ Unlock your engine’s true potential with precision Viton valve seals!

PROUDLY MADE IN THE USA - Trust in American manufacturing quality and reliability for your high-performance engine needs.
PRECISION GUIDE ATTACHMENT - Designed to mount on valve guides, ensuring a secure fit and requiring professional machining for optimal results.
ENGINEERED FOR PEAK PERFORMANCE - Upgrade from factory O-ring seals with durable Viton construction for superior heat and wear resistance.
MAXIMIZED VALVE SPRING CLEARANCE - Smaller outside diameter allows enhanced clearance for dual and beehive valve springs, boosting engine efficiency.
PERFECT FIT FOR 530 GUIDES 11 32 STEMS - Specifically tailored to fit engines with these exact dimensions, guaranteeing seamless compatibility.

The Comp Cams 518-16 set features 16 high-performance Viton valve seals engineered for .530" valve guides and 11/32" valve stems. These seals offer superior heat resistance and durability compared to factory O-ring styles, require machining for guide attachment, and provide enhanced clearance for advanced valve spring setups. Made in the USA, they deliver a precise fit and reliable upgrade for serious engine builders.

Specifications

Material	Viton
Nominal Inside Diameter	0.53 Inches
Item Diameter	0.53 Inches
Brand	Comp Cams
Color	Silver
Nominal Outside Diameter	0.53 Inches
UPC	036584142966 786434163893
Manufacturer	COMP Cams
Unit Count	1.0 Count
Global Trade Identification Number	00036584142966
Model	518-16
Item Weight	0.353 ounces
Item model number	518-16
Is Discontinued By Manufacturer	No
Manufacturer Part Number	518-16
OEM Part Number	N

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$55.13

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Sold byAmazon USADelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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