benidorm50

93 5.0.... installing AFR 185 heads according to poster MJR 46 pistons must be notched this is news to me asI thought it was only 1986 and earlier accordingto thepeople at AFR...any input would help thanx

Tims 88GT

I bought 165's for my92 gt because afr told me that the 2.02 valve would hit? dunno

mjr46

afr 165's will clear stock pistons the diameter of a 2.02 valve will cause interference unless you use a trick flow twisted wedge head with a canted valve set up.....anything bigger than a 1.94 or 1.90 valve on the intake side will cause probs...google it

mjr46

here read this and you'll understand what needs to be done
http://www.fordmuscle.com/archives/2...obra/index.php

92GreyGT

I helped a guy put AFR185s on a stock short block with a Trick Fow stage 1 cam. We clayed the pistons and the intake was at the limit to be safe but it worked. In my opinion that cam was to small to take advantage of that size head but he was running a blower so that helped pump the cylinders full. What are your goals, if you are going to stay 302ci I would just go with the 165s.

Joel5.0

And the camshaft you'll be installing is?

5spd GT

Yep, it is the camshaft that is going to be the big factor.

88BlueGT

+1 Absolutly.

OnyxCobra

Yeah they say you'll have to notch the pistons with the AFR 185s because usually you'll want to run a cam with much more than .499 lift to make optimal use of the 185 heads. Depending on your plans the AFR 165s could be just fine, the flow isn't majorly different between the two.

5spd GT

It is not the lift that causes piston to valve clearance issues.

Why would the valve need to be opened up to its peak when the piston is at TDC? There is no "gap" to fill.