Good heads for a boosted Windsor.

[Diabolic]

I'm getting the itch to upgrade my cylinder heads on the 93 Lightning. It had a 9.1 comp setup right now with small AFR 165 heads and a stock HO cam. The power comes from an intercooled Novi 2000 making between 14-20#'s of boost @ 5100 rpm. Boost depends on belt slip and ambient temp. I daily drive this truck so I'm not looking to change cams or rev it any higher than I do now. Since the cam is small and the pistons are dish, I have some choices for the heads. I was thinking some otb Vic Jr's because of the 2.05 valves on the intake. Since the cam has little duration and not much lift I thought the larger intake valve would help. I've also looked at some TW 190's and some AFR 205's. The 190's have the 2.02 intake valve as do the AFR's I believe. THe head design of the latter two flow more and cost more than the Vic Jr heads. Anyone have any experience with boosted engines and valve size vs port flow? Is it better to have a better flowing head with smaller valves or a less optimum port with larger valves? I realize that the valves play a role in flow numbers so this may not be a valid arguement at all.

[onjacks]

afr 205

[91CoupeMike]

Afr 205, to my knowledge when you're running boost you'd want a larger Valve and the ports aren't as important because you're forcing the air in.

While n/a the port would play a vital role as it is pulling the air in, and a smaller valve will help with air velocity.

[FoxBodyNick]

The ports are important. larger ports on same setup will lower the boost.

[Diabolic]

I see that the AFR 205 actually has a 2.080 valve on the intake and flows
291@.500 on the intake and 219@.500 on the exhaust. They are $1870 a pair. I wonder if those 2.080 valves will clear my pistons even with the stock HO cam? I don't want to replace the shortblock yet. The AFR 195's are close in specs but have a 2.05 intake valve, and I know they clear.

[Diabolic]

To be completely honest, the AFR 185's might even flow enough to split the F4TE block. Right now it looks like the AFR 195's would be the choice for me.

[91CoupeMike]

For that price, buy a dart shp.

[Diabolic]

For what price? Mike are you talking blocks or heads here?

[91CoupeMike]

For what price? Mike are you talking blocks or heads here?

For $1800 dart shp block.

Sorry it's off topic.

[Blackpony]

^^ there is no need for that. A stock windsor block can handle 900 hp without concern.

As for the heads any one of the setups you mentioned would be great. i personally am more of an afr fan, so i would say the 185's.

[jyro]

split 351w roller blocks?

To be completely honest, the AFR 185's might even flow enough to split the F4TE block. Right now it looks like the AFR 195's would be the choice for me.

I never saw one.

[junk racing]

We run twisted wedge heads on my dads car, makes 800-1000 rwhp depending on tuneup. It's a 418 with a S480turbo blowthrough setup....2.02 1.60 valves. Gone 5.60s so far on a mild tuneup through a aod. Your forcing air through the head on a forced induction setup. The boost is a measure of restriction. I would do a afr 185 if it were mine don't really see the need for anything bigger

[Diabolic]

It will be stroked to 408 next year. Yes the AFR 185 of 195's are going to be purchased.

[dee]

If you're going 408 that soon just get the 205's and sit on them till the motor is done.

[Blackpony]

^^ this.... If you have plans to go bigger then the 185's will hold you back a bit. The 195 race port will be a much better selection especially since you have a blower.