camaroeater

i was looking at comp cam xe264hr or 266hr, this for my dd, so i don't want drivability to suffer much. My goal is to end up around 275-290rwhp.

heres the specs:

Comp 266HR 266/270 advertised duration 210/215 duration @ .050" .533/.533 lift 114* lobe seperation angle 1200-5200 RPM operating range

Comp XE264HR Mild street performance 264/270 advertised duration 212/218 duration @ .050" .512/.512 lift 114* lobe seperation angle 1500-5500 RPM operating range.

Portmaster

Unless you have some better heads and intake you won't be close

cassimus

with gt40p heads how good is a e303?

Modfox5.8

I agree, you may fall short of the 275 Mark.
And an E cam would compliment those heads nicely.
Great cams for the price

89musclestang

those letter cams are junk... go with comp or get a custom made

AdderMk2

Portmaster. I dont know what you have against the GT-40P heads.. But a properly setup combo CAN make 300rwhp with them.

Your nay-saying really makes me with I still had my 276hp dyno chart from when I ran my car with the stock motor and Tweecer tune!

Portmaster

I don't have anything against them. It's a decent upgrade over an E7 or any production head before it. It's just I'm realistic. I've never had a GT40 headed N/A mustng on my chassis dyno that put out 300 at the wheels. Thats not to say it can't be done. Guys would keep bringing their cars in for the Sat Morning dyno special (3 pulls $50) and as many things as they tried with cam swaps, intake swaps it seems as though the average was about 260 for the good ones. I'm sure 300hp is real possible but the average guy isn't going to swap cams every other week to get it there. I just beleive in being very realistic and for 300 rwhp with a set of GT40p heads would inlolve some porting and a custom cam and a good intake.

AdderMk2

so, riddle me this... what do you think it would take to get a set of stock GT-40 heads to make 250+ rwhp

be honest

Portmaster

With a Manual transmission and totally stock heads I would say

GT40p heads
Comp XE270HR
Edelbrock RPM air gap, Performer RPM, Crosswind, Steath
Holley 670 street avenger
long tube headers 2.5 inch exhaust.

For Fuel injection

GT40p heads
Comp XE264HR
Edelbrock Performer intake, Cobra, Explorer intake
24lb injectors and MAF
Long tubes into 2.5 inch exhaust

Keeping these combos in mind that PTV clearance issues with a stock shortblock, Compression ratio, the flow of the head and the best overall power within the limits of the heads. Going too big on the cam will cause PTV issues, hurt bottom end torque and overall power where the heads are capable. Keep the power range of the cam and intake where the heads work best will make the best over all power and torque. Peak numbers on a dyno isn't everything. Both combos should make 250 rwhp. The biggest thing is the big torque down low and thats where to use the power these combos would make.

My opinion is that people put way to much importance on peak hp numbers. It's just a math figure of Torque X RPM /5252. Make the torque where the heads shine and gear it right and it will run well. Try to make a killer hp number (for the heads) and you can kill off what really moves the car and that is torque.

AdderMk2

mispost