afr 205 383 vs et ls7 402
05-15-2006, 01:04 PM
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afr 205 383 vs et ls7 402 How much power do you guys expect each one to make? My buds trying to decide if the cost to change to an et ls7 4" 402 is worth it or not, or freshen his afr 205 383 w fast 90. I think the LS7 route would really shine, using that manifold is a big help.
05-15-2006, 01:28 PM
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Originally Posted by Greg Fell
How much power do you guys expect each one to make? My buds trying to decide if the cost to change to an et ls7 4" 402 is worth it or not, or freshen his afr 205 383 w fast 90. I think the LS7 route would really shine, using that manifold is a big help.
The LS7 is a superior architecture when compared to the "cathedral" standard LS stuff.
Lots of variables here of course such as cam selection, how much each package is maximized (for example comparing the LS7 build to my personal 383 wouldnt be as large a gap) etc. etc., but assuming average results from both I would imagine that the LS7 headed larger displacement combination would be about 75-100 RWHP stronger.
Now look at what it's going to cost and do the math (how much are you paying for each pony)....my guess is it will be in the vicinity of a $80-$100 per horsepower....not horrible, but certainly not cheap. About the going price though once you're in the vicinity of 600 RWHP which is where I would anticipate the LS7 headed combo to be. Its all subjective to each individual's pocket book and what their willing to spend for that extra power....
Last edited by Tony Mamo @ AFR; 05-15-2006 at 03:59 PM.
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05-16-2006, 07:02 PM
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383/402 I don't even see a 1000 dollar difference, being that the ls7 intake is cheaper than a fast 90 setup. The only difference that I see is in the cost of the heads, which do use stock LS7 rockers and we supply the stands with it. To some it may be more than what they need, for some it will still not be enough. I am doing a 402 buildup right now with all of the 4.00 bore ETP components, 238/246 ETP cam and an iron block, Fbody with a Lentech AOD behind it. I hope to have it on the dyno within 30 days. We have already had results from customer cars, Even though they dont have the peak numbers that the 4.125 bore heads have, they are not very far behind on power from the 427's. I believe it will definitely be a much cheaper alternative to a LS7 crate motor. I like what Tony had done with his build, as well as being informative. I will try to do the same.
