OEM Factory for ASTM A307 Grade A Hex Cap Screws to Denver Manufacturer

A194 2H Nuts to Vietnam

ASTM A490 Structural Bolts for New Zealand

Bolts On Tires

Hex Bolts Lowes

Socket Set Screws to Colombia

Step Down Studs to Philippines

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OEM Factory for ASTM A307 Grade A Hex Cap Screws to Denver Manufacturer Related Video:

The heads are ready for the 4.8 flat top pistoned 5.3 that is going into the ’87 Chevy Truck. These 862 cast heads have been fully home ported and used 2″ LS1 intake valves installed.

These heads were not flow tested, but I expect them to flow a little better then LS6 243 cast heads as my past heads have done.

I made the decision to run the 2″ valve because it was used so often in other LS motors and even in the HO5.3 with 243 heads, which is basically what I’m coping here.

I measured the throat and all diameters of the 5.3 valve seat vs the ones in a pair of LS1 heads. They came out to appear to be the same valve seat.

Springs are PAC 1218 .600″ Lift. Link below:

https://www.briantooleyracing.com/600-lift-pac-1218-beehive-valve-springs.html

Comp 511-16 Valve Stem Seals Here:

https://www.summitracing.com/parts/cca-511-16/overview/

UPDATE:
The heads were later pulled off of the truck and milled .045″ to achieve 11.4:1 Compression Ratio.

as titled
a gadget on someone’s roof