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Contact Us For Technical Assistance
How do I contact Technical Support?
Please use the "Contact Us" button at the upper right to send us your questions. E-Mailing is the most effective and time-saving way to get the information you need! This gives us the most time to...

Casting ID Guide
How do I indentify my World Products Heads or Block?
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Technical FAQs
Which cylinder heads do I have and what are the component specs for the valves and springs?
FAQ All the heads we make have cast-in letters and codes under the valve cover. It is important to note that World ...
Which pushrods should I use?
FAQ We advise that you acquire an adjustable checking pushrod to get an exact spec. Variables such as rocker ratio ...
Which spark plugs do I need?
FAQ World head combinations and crate engines (BBC, SBC, SBF & Mopar) use either Accel 276* (iron heads) or 416 (al...
Why do I have distributor trouble or engine misfiring if you ran this engine on a dyno
FAQ All our crate engines are dyno tested - however, the only time 12 volt battery power is in effect is actually s...
I have a rear main seal leak, why did you ship the engine to me that way?
FAQ The truth is, we didn't. As we complete the assembly of an engine, we add a leak detection dye to the oil. Afte...
Why do aluminum heads make more power?
FAQ They really don’t make more power-by themselves. Aluminum can dissipate heat better than cast iron heads, all...
How can I determine valve lift if I change rocker arm ratio?
FAQ Using the advertised valve lift of your cam, divide that figure by the current rocker ratio. This figure is you...
What does “Racer Special” porting mean?
FAQ These procedures consist of matching the port opening to the required gasket by slightly hand grinding the port...
When should I be concerned about piston to valve clearance?
FAQ As an engine builder, you should check this clearance anytime a parts or machining change is made which may aff...
What do the terms “internal” and “external” balance mean?
FAQ The procedure for internal balancing begins by measuring the weights of the piston, wrist pin, rings, rod and r...
What is the best compression ratio for street operation with pump gas?
FAQ The engines we build range from 9.5:1 to 11.6:1 for the 91 octane pump gas Street engines. Our Race series engi...
How much can I mill my heads?
FAQ Flat milling is at discretion of the Engine Builder. The intake seat is the limit of a flat mill, but deck thic...

Head Flow Info
World Castings Head Flow Data
Updated Flow Numbers for all our heads!...

Technical Bulletins
Tech Bulletins

Block & Head Hardware Kits
What is the ARP Part # for World Block & Head Hardware Kits?
ARP - The world leader in fastener technology has the right Head Stud Kits for World Products Cylinder Heads. Click for the complete list....

Website Policies
Privacy Policy
FAQ Your privacy is very important to us. Accordingly, we have developed this Policy in order for you to unders...
Return Policy
FAQ Contact customer service to obtain a Return Material Authorization number (RMA#)directly from customer serv...
Web Site Terms and Conditions of Use
FAQ 1. Terms By accessing this web site, you are agreeing to be bound by these website Terms and Conditions ...

Warranties
Warranty Terms
WARRANTY TERMS:

No warranties of any nature (expressed, implied, fitness of usage or merchantability) are given on these products. Seller undertakes no responsibility for any product sold. A...
Warranty Claims
FAQ Contact customer service to obtain a Return Material Authorization number directly from Bill Mitchell Produc...