Hey guys- new to this forum and looking for some input on a cam. I've got a set of ported GT40 heads off of a 93 Cobra. Stock shortblock, 3.73 gears, 5 speed, shortie headers, 70mm throttle body, 24# injectors, typhoon intake. Looking for a cam- TFS stage 1, xe270hr, AFM N41, xe274? Don't want to notch my pistons. Any advice? thanks!
What cam for ported GT40 heads?
- Thread starter silverpony91
- Start date
RARE NOTCH
Member
I just completed my ported GT40 heads/performer/270hr114 comp cam over the weekend.Also 3.73.KC clutch,triax,pulleys,3g install,FRPP rocker/pushrods,FRPP alum D/S,BBK LT's,offroad X-pipe and MAC mufflers.My last 89 made 259/315 with ported E7's,TMOSS intake,crane 2030 and this car has at least 30 more HP,it pulls so much harder.
robo
Member
call cam motion and have a custom cam ground for your application. it will only cost you about 50 bones more than an off the shelf cam and it will be tailored to your exact setup.
there is a form you fill out with everything you can imagine about your car and they use that info to grind the cam.
i have a similar setup.... ported gt-40 aluminum heads, 11.5 to 1 compression, naturally aspirated and my grind is 236 238 and 590 lift. 110 degrees of lca.
it's the only way to know you actually have the correct cam for the combo you are using. anything else is a shot in the dark.
there is a form you fill out with everything you can imagine about your car and they use that info to grind the cam.
i have a similar setup.... ported gt-40 aluminum heads, 11.5 to 1 compression, naturally aspirated and my grind is 236 238 and 590 lift. 110 degrees of lca.
it's the only way to know you actually have the correct cam for the combo you are using. anything else is a shot in the dark.
i have ported gt40 heads, cobra intake, 1.7 rr, 65mm tb, CAI, and an e303... my dyno was 265/304. im thinkin with the single pattern e303 i might be leaving a little on the table so ive been doing the same research you are.... and lookn at the same exact cams. i have notched pistons tho so pvc isnt a problem. e303 does sound and run well though.
t5?
what exhaust?
what compression?
most of the cars I have seen dyno in the 275-280rwhp range with that setup (with a stick)
i had it dynoed with hi flow cats. xpipe 2 chamber flows. shorties. now its an offroad x. it is a 5 speed. compression i believe is 9.7:1...
thats the area i expected to dyno but owell...
15-20 hp loss is a TON to lose to save 50-100$ after spending all that coin on head porting.
where does it say he had the port job done?
He could have done it himself
15-20hp shows up as 5-6rwhp on a chassis dyno. To me the difference on the street is negligible.
so what you're saying is that cars have a 75% drivetrain loss to the rear wheels and that 20hp is 5 at the wheels...lol.
20hp at the flywheel will be about 15 at the wheels.
people spend 500-600$ all the time on intake swaps or complete exhaust swaps just to gain 15-20 hp.
cam selection is very important. It's thinking like that which is why you see posts all the time...where'd my HP go. Wrong combo's built.
e cam works "ok" for stock gt40 heads. However, assuming the heads were ported correctly, he'd be losing hard work put into the heads with the wrong cam
20hp at the flywheel will be about 15 at the wheels.
people spend 500-600$ all the time on intake swaps or complete exhaust swaps just to gain 15-20 hp.
cam selection is very important. It's thinking like that which is why you see posts all the time...where'd my HP go. Wrong combo's built.
e cam works "ok" for stock gt40 heads. However, assuming the heads were ported correctly, he'd be losing hard work put into the heads with the wrong cam
True. Unfortunately I don't really think in flywheel hp. I have ran only 2 motors on an engine dyno and probably 20-30 on a chassis dyno. Its much easier for me to think of a setup in rwhp and not fwhp. So 10-15hp would have been much more accurate.
The point of all my posts in this thread so far have been this:
this setup will run 7.80s-7.90s 1/8 almost regardless of what cam he puts in it. Be it a tfs stage 1, xe274, or even an e. I have seen cars with a decent 60ft run high 7.60s with an e cam and I have seen others with a stage 1/274 run 8.0s. The HP differences between all those cams is small enough that tuning an engine and then letting it sit overnight could make up the difference. To me the $80-100 is better spent elsewhere, but thats just my $0.02.
robo
Member
camshaft selection plays a crucial role in performance. to spend a lot of money on an engine and haphazardly choose an "off the shelf" cam is nuts!
call cam motion or another company that can offer you a custom grind that will bring your combo together. it will be money well spent!
call cam motion or another company that can offer you a custom grind that will bring your combo together. it will be money well spent!
Similar threads
