AFR 205's on a 393 Stroker?

[wickedmach1]

I spoke with Scott at AFR today. I want to use a shaker on my 393 stroker engine for my '70 Mach 1. This means I need to use a dual-plane intake like a Weiand Stealth due to the height of the Vic Jr. My question was if I could use the 205's with the Stealth intake and have no affect on performance. Scott said I would lose a little down low but not enough to notice a difference on the 393 cube engine. I figure after spending $200 for upgraded springs and 7/16 studs, I am about $100 shy of buying 205's ($1630) which come with the upgrades. Parting with the shaker and replacing the Stealth with a Vic Jr. intake is a bunch cheaper than buying new heads if I ever wanted more HP down the road. I understand the dual-plane will be a restriction for airflow but will it be enough to notice? I will be happy to make 500 HP at the flywheel and will look for no more. I am building a street car and that is it. I know the 185's will have more velocity than the 205's. Scott just recommends the 205's on the 393 since they will breath a bit more and I wanted to bounce this off of you guys for your opinions. Thanks for the help.

 

[mustang70]

Do the 205's come with the springs and studs you need? I talked to them about going with 205's and I would need to upgrade the springs as well. That put me right in the price range of 225's. So I asked about those and I would have to upgrade the springs on the 225's as well.
Something else to consider if you want more horsepower down the road is that you can have the heads ported and polished.

 

[wickedmach1]

AFR 185's
.450” OD Hydraulic Dual Valve Spring with dampner, 120 lbs. on seat, .550” maximum lift (upgrades available), AFR #8020

3/8” Rocker Studs, AFR #6410


AFR 205's
1.550” OD Roller Dual Valve Spring with dampner, 210 lbs. on seat, .670” maximum lift, AFR #8000

7/16” Rocker Studs, AFR #6405

 

[tjm73]

If you are going to run a dual plane Stealth (awesome intake BTW), I think the 205's would be overkill. 185's will make boku power. The 205's with a Victor Jr. would make plenty more, but that intake won't work with your planned setup as you said.

 

[slapper]

I think the 205's will work with the Stealth dual plane. Be sure and port match the intake to the heads. Alot of the efficiency will depend upon the camshaft specifications and the CFM of the carburetor to produce a strong metering signal.