K24a4 block p2v clearance on k20 head

1916 Views 5 Replies 3 Participants Last post by KBuilt, Feb 14, 2021

thomas_vasquez

Discussion Starter · Feb 14, 2021

I currently have a k20z1 head i want to run with a k24a4 block but I’ve heard there is issues with the pistons hitting the valves. What must be done to the block or head to avoid pistons hitting the valves?

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thomas_vasquez

Discussion Starter · #5 · Feb 14, 2021

724Original said:
Change pistons, you can use k24a2 pistons or aftermarket. While your in there may as well change rods cause a4 rods will work with the a2 pistons but a4 rods are really small and on the weak side. There has been some people that have been able to run k20 head on a stock a4 bottom end by limiting vtc. I’ve never tried cause usually you can get an a4 in my area for 150-200. So I usually take the left over money and do up the bottom end, rods bearings and pistons and depending on what plans the are for motor, I throw a k20a2 oil pump in it.

Yes i am definitely going with aftermarket pistons and rods just wanted to be sure that would stop the p2v contact. Also in an a4 does the oil port also need to be blocked?

724Original said:
Change pistons, you can use k24a2 pistons or aftermarket. While your in there may as well change rods cause a4 rods will work with the a2 pistons but a4 rods are really small and on the weak side. There has been some people that have been able to run k20 head on a stock a4 bottom end by limiting vtc. I’ve never tried cause usually you can get an a4 in my area for 150-200. So I usually take the left over money and do up the bottom end, rods bearings and pistons and depending on what plans the are for motor, I throw a k20a2 oil pump in it.

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