blsnelling

iTrader: (4)

I need a set now!

G Atsma

I would love to see the specs on these, especially on whether they can be used on the 3.78" bore 4.8/5.3.

NAVYBLUE210

Anyone know if these are cast off-shore?

wannafbody

iTrader: (2)

They better be better than 799 heads since those are now selling around $300 a set.

LilJayV10

iTrader: (39)

Do you want cheap or Made in America?

Pick one....

gollum

iTrader: (1)

Wouldin' the new Promaxx small bore LS3 heads be a better option. They state their as cast square ports will out flow most all ported cathedral heads. Bolt on a cheap LS3 intake and rock.
https://ls1tech.com/forums/generatio...ls3-heads.html

G Atsma

I have a feeling these new heads will be better for low and mid range torque, especially on lower displacement engines

LLLosingit

iTrader: (4)

I guess it's going to depend on what you get for $1200, I can't see them bring on the price down on AFR current heads really because they aren't going to flow as well and won't have the same quality components.

SoCalDave

I don't know how 799 heads compare to aftermarket heads, but my 799 heads have been a great upgrade.

LLLosingit

iTrader: (4)

They are really a great upgrade on engines that were originally running 317 heads. I was kind of shocked to see the 706/862 heads did so well on 6.0, They may not flow as well as the 243's but the bump in compression they are worth apparently makes up for the difference in airflow over the 799/243 heads. Aftermarket heads will typically flow better in the lower RPM range while still not giving up power at the top end, Basically they produce a better average torque and HP. It also helps that you can get heads better suited for the larger engines.

wannafbody

iTrader: (2)

2 hp difference between a 706/243 head isn't enough to be concerned with, I'll take the larger valve and runner of the 243. Mill 243's to 62 cc and there's your winner.

SoCalDave

Cool so aftermarket heads have a better power curve. That seems to be the case with the 799 heads on my LS1 Camaro. The power curve has improved so much I came close to a 1.9x 60ft at Irwindale. Of course I did port the intake and removed casting flash on the exhaust side. I left the combustion chambers alone so I could increase compression to just about 10.7 to 1 to go with the improved flow of my home ported 799 heads.

wannafbody

iTrader: (2)

1.9 60ft is hardly brag worthy. I'm sure with some practice and sticky tires you could get that number down. Some guys are running sub 1.5 second 60 ft times.

SoCalDave

I did a 2.030 60ft with street tire and just sharing that so others keep in mind that high dollar street slicks are not needed for good launches. I did a 1.875 60ft in a buddies C7 and ran a mid 12 and that car is on the pricey side. Sub 2.0 60fts come at a price.

LLLosingit

iTrader: (4)

If someone has a basically stock engine then ported stock heads work great but most aftermarket heads will still make more power...probably not enough to justify the $2,000+ price tag. Where they really shine is on an engine that was built to take advantage of them, Instead of seeing 25-30hp increase over a stock ported head they may make 70+ more hp and in many cases it's well above that. Big cubic inch or boosted engines can use all the flow advantage they offer and they become cost effective. I think these budget AFR heads will fall in between stock heads and the high dollar heads. In other words, Rather than someone paying to have stock heads cnc ported and installing better valve springs/retainers, You'll be able to buy these ready to bolt on for about the same cost. I can't wait to see what they are offering for the low price.

wannafbody

iTrader: (2)

Street tires are safer for the rear, for sure.

LLLosingit

iTrader: (4)

Question is what kind of 60ft can you get out of street tires on the street versus a street legal drag radial? I'm running 12" wide Nitto Innvo's and they don't hook at all on the street so the only option I have is a street legal drag radial.

AgFormula02

iTrader: (13)

A 275 tire is enough to hook a lot of power.
Ask the x275 guys.

LLLosingit

iTrader: (4)

A 275 drag radial or 10 1/2" slick is to keep the field even, The same car would (Edit:usually)go faster on a big tire if setup for it.

AgFormula02

iTrader: (13)

yes. My point is you don’t need a huge tire to hook. Can you go faster with more tire? Yes.
But you don’t need a huge tire to go sub 1.2 60 foot times.