Stay stock or swap heads?

[lukecibilich]

alright i have a cammed 5.3 with stock 706 heads and i plan on trading my heads for my friend's Dart pro series I heads,

I believe 706's have 61ish cc chambers and I'm pretty sure his have 62 cc chambers

My question, Is it worth it to do the swap and trade a small bit of compression for better flow? I dont really feel like waiting to have these heads milled, so they go on as is.

BTW, Im staying N/A and I'm putting a 100-150 shot on it soon, and im almost sure the intake runners on the Dart heads are 225cc maybe not?

my mods are
220 cam
lt's
boltons
small stall, gears

[kerrige]

IIRC series one has 205cc intake runners however those should be far superior to stock flow especially come time for the spray. The loss of compression should be nearly unnoticeable. I think that is a great trade considering those heads cost 600+ each new.

[Botlfed]

Wish i could say but im a ratard with compression ratios and flow rates

[lukecibilich]

Wish i could say but im a ratard with compression ratios and flow rates

get complicated sometimes lol

[lukecibilich]

how much do you think i would gain? with that compression it almost seems like a waste to Not boost it instead of using N20

[bangbangskeetskeet]

The drop in compression would be right at 0.1:1 which I dont think would be noticable.

I say go for it. Even if you decide that you dont like them you could probably have your 706 heads worked, maybe milled and toss those back on and sell the Darts.

[lukecibilich]

i would but im actually trading my 706's for my friends dart plus some cash. i just wanna how much more hp it would put out if the cr was say around 11:1 instead of ~9.4, before i go aheead and do the swap

[bangbangskeetskeet]

Significantly more I think. There really is no way to know other than do a back to back dyno comparrison with the stock heads and some milled heads to get the compression up.