FERREA VALVE SPRING KIT K20C1/ K20C4 HONDA CIVIC TYPE R/ Type S Honda Pilot 4th Gen (2023+) *c)* The bolt head must

*c)* The bolt head must be identical to the existing bolt:

Rear 8kgf/mm (Optional 7kgf/mm & 9kgf/mm per request)

aluminum pipe for reduced pressure loss

T304 Stainless Steel Our industry-leading and most durable material offering

After months of testing

FERREA VALVE SPRING KIT K20C1/ K20C4 HONDA CIVIC TYPE R/ Type S Honda Pilot 4th Gen (2023+) *c)* The bolt head mustFITS: 10th Gen Honda Civic Type R 11th Gen Honda Civic Type R 10th Honda Accord 3rd Gen Acura RDX 5th Gen Acura Integra Type S 2nd Gen Acura TLX The OEM Honda valvetrain can handle bursts to 7000 rpm, but there have been failures with extended periods of continuous RPM at that level. The Ferrea valve spring kit uses a high quality PAC spring. made in the USA. It increases the seat pressure more than 20 psi on the seat to help control valve bounce and