Afr165s or 185s

91lx3xblack · Jan 2, 2007

So i recently built a 331 with about 9.5:1 comp wiht a set of gt40p heads, it has a performer rpm2 intake and a comp cams xe276hr cam. i have been working with this combo and wanted to make it a little more matched to what i already have.
So what do you Guys think a set of 165s or 185s?
If not afrs What other heads would be a good match for my combo?

i might also say i have 373s and its going in a street/strip lx convertilbe...

aleborjas · Jan 2, 2007

go 185's i think is your best match! remember that your cam is to be used with 1.7 rockers

1SLO306 · Jan 2, 2007

i would go 185's and u will have to to thier valve spring upgrade that allows .550 lift

oh hope u have a roll bar in that vert caus i think after 13.5 u need one and ur pass that lol

1Stang2Go · Jan 2, 2007

Go with the 185's..
MM&FF did a head swap on a orange notch with a 331 not to long ago. They used the RHS heads and everything sounded good from what i remember.
Sept issue, page138...Back in business...
can't go wrong with afr though..

wicked84gt350 · Jan 2, 2007

91lx3xblack said:
So i recently built a 331 with about 9.5:1 comp wiht a set of gt40p heads, it has a performer rpm2 intake and a comp cams xe276hr cam. i have been working with this combo and wanted to make it a little more matched to what i already have.
So what do you Guys think a set of 165s or 185s?
If not afrs What other heads would be a good match for my combo?

i might also say i have 373s and its going in a street/strip lx convertilbe...

You have the same combo 185cc If I remeber right that cam is a retro fit and it does .513 lift with 1.6 rr so just stay with 1.6 its easier on the valve train and it is not worth the money to flycutt for 7 hp if you must upgrade then do 1.65rr. But its a great combo.

txstang84 · Jan 2, 2007

+1 for 185's...with the displacement and cam, the 165's might starve you a little on the top end...

91lx3xblack · Jan 2, 2007

looks like the 185s are one hell of a head the way everyone is talking here!

1SLO306 · Jan 2, 2007

wicked84gt350 said:
You have the same combo 185cc If I remeber right that cam is a retro fit and it does .513 lift with 1.6 rr so just stay with 1.6 its easier on the valve train and it is not worth the money to flycutt for 7 hp if you must upgrade then do 1.65rr. But its a great combo.

nope, the XE276HR is not the retro fit cam(which would be the(XR276RF-HR). the XE276HR cam has 544/544 lift duration@.050 is 224/230 and LSA 112 and requires 1.7RR as stated me comp cam

his cam is a step up from the one that is installed in my 306 i have forsale i have a XE274HR

91lx3xblack · Jan 2, 2007

yeah those numbers sound closer to what i remember off my cam card.

wicked84gt350 · Jan 2, 2007

1SLO306 said:
nope, the XE276HR is not the retro fit cam(which would be the(XR276RF-HR). the XE276HR cam has 544/544 lift duration@.050 is 224/230 and LSA 112 and requires 1.7RR as stated me comp cam

his cam is a step up from the one that is installed in my 306 i have forsale i have a XE274HR

Well the cams are the exact same the retro fit just has a smaller base circle and is ground on a 110 lsa which is better for me because I have only 306 in. But If you really look at it with 1.7 you will be running into valve float earlier and just be over stressing the valve train and I assume this will be a street car. so You will be better off with 1.6 or 1.65. 1.6 will put you at 512 and 1.65 will put you at 528 with is plenty, the tech at comp is just trying to get you the most amount of power out of the cam not really conserned with the long run. Plus if you call next week he will tell you to buy a different cam. But that cam is a exclent pick I would even recomend a xe270hr which will improve low end torque alot and only lose 3-4 hp on the top but have much better low and mid range plus it will idle a alot smoother which is better for fuel injection.

1SLO306 · Jan 2, 2007

wicked84gt350 said:
Well the cams are the exact same the retro fit just has a smaller base circle and is ground on a 110 lsa which is better for me because I have only 306 in. But If you really look at it with 1.7 you will be running into valve float earlier and just be over stressing the valve train and I assume this will be a street car. so You will be better off with 1.6 or 1.65. 1.6 will put you at 512 and 1.65 will put you at 528 with is plenty, the tech at comp is just trying to get you the most amount of power out of the cam not really conserned with the long run. Plus if you call next week he will tell you to buy a different cam. But that cam is a exclent pick I would even recomend a xe270hr which will improve low end torque alot and only lose 3-4 hp on the top but have much better low and mid range plus it will idle a alot smoother which is better for fuel injection.

well he has a 331 stroker engine i assume cause its a 331. He already has the cam which seems like a good combo with his engine. I dont think comp put 1.7RR up there just cause it gives more power but because it is what is better for that cam. the cam u suggested wouldnt be so great with the 185's and a 331 cause its for mild mod engine. the one he has now is for major mod engine. so ur saying have a slight rough idle is bad for Fuel injection?

wicked84gt350 · Jan 2, 2007

1SLO306 said:
well he has a 331 stroker engine i assume cause its a 331. He already has the cam which seems like a good combo with his engine. I dont think comp put 1.7RR up there just cause it gives more power but because it is what is better for that cam. the cam u suggested wouldnt be so great with the 185's and a 331 cause its for mild mod engine. the one he has now is for major mod engine. so ur saying have a slight rough idle is bad for Fuel injection?

No the other cam I suggested has the same lift and lsa just a little less duration the duration on the cam is 270 276 which and only has a overlap of 53 degrees which will still provide a nice idle and no fuel ingection does not like a lot of over lap the 276 cam will have quite a bit of rough idle a lot more than you think. The duration only moves the powerband up ward and will effect overlap according to the lsa. The 276 and afr 185 are a great combo but the 270 cam is just a better street cam. The 276 cam has a overlap of 59 degrees which is only 6 dregrees more but it will effect idle with such small cubes. The rr ratio has nothing to do with what is better for the cam it just puts more lift at the valve and more wear on the guides and the valve float a lot sooner and if you look comp recmends different springs to account for the float. And just because the description you read at the comp website said it was for mild mods it is not limited to that and really does not describe the cams charestics. The afr heads flow really well and truely dont need a massive cam to make power.

1SLO306 · Jan 2, 2007

wicked84gt350 said:
No the other cam I suggested has the same lift and lsa just a little less duration the duration on the cam is 270 276 which and only has a overlap of 53 degrees which will still provide a nice idle and no fuel ingection does not like a lot of over lap the 276 cam will have quite a bit of rough idle a lot more than you think. The duration only moves the powerband up ward and will effect overlap according to the lsa. The 276 and afr 185 are a great combo but the 270 cam is just a better street cam. The 276 cam has a overlap of 59 degrees which is only 6 dregrees more but it will effect idle with such small cubes. The rr ratio has nothing to do with what is better for the cam it just puts more lift at the valve and more wear on the guides and the valve float a lot sooner and if you look comp recmends different springs to account for the float. And just because the description you read at the comp website said it was for mild mods it is not limited to that and really does not describe the cams charestics. The afr heads flow really well and truely dont need a massive cam to make power.

ok comp cams dont know chit about thier own cams and what people need to use with them. its about like an auto car. they say u need at least a 2500 stall and u say get 2300 itll work better but im done with ya. preety surry the guy isnt gonna change the cam. oh and any aftermarket cam is going to put more wear on parts. Ive did research with the xe274hr came i had w/ 185's and that cam has 555/565 lift 224/232 duration@.050 and LSA 112.

90LX306 · Jan 2, 2007

I also run a xe274 cam on my 306 and it is indeed 555/565 with 1.6 rockers.

I also run AFR 185's on my 306, id say go with the 185's on your 331 with the upgraded springs.

1SLO306 · Jan 2, 2007

90LX306 said:
I also run a xe274 cam on my 306 and it is indeed 555/565 with 1.6 rockers.

I also run AFR 185's on my 306, id say go with the 185's on your 331 with the upgraded springs.

also wouldnt u agree to go with what comp recommends on the xe276hr. the 1.7RR

relly my point is to get accross is that he spent a crap load of money on that cam cause he wanted them specs. y would he buy a $360 cam and put 1.6RR to get less lift. he could of got a b cam with 1.7 and did what wicked is trying to tell him to do and saved some money.

wicked84gt350 · Jan 2, 2007

1SLO306 said:
also wouldnt u agree to go with what comp recommends on the xe276hr. the 1.7RR

relly my point is to get accross is that he spent a crap load of money on that cam cause he wanted them specs. y would he buy a $360 cam and put 1.6RR to get less lift. he could of got a b cam with 1.7 and did what wicked is trying to tell him to do and saved some money.

All I was doing was making a recomendation I stated that the 276 cam would be exclent infact thats the cam going to run but in retro fit. And i said the 270 cam will have better low and mid tourque with those heads never said he should change the cam out. And in reality the rocker in no way effects the cam only the valve lift. Yes comp says to get that amount of lift you must use a 1.7rr but no were do they say the cam is only going to work with 1.7. The reason I suggested the 1.6 rocker arms is the springs that come with the afr is only good for 550 max lift the seat pressure is 125 lbs at seat and 300 lbs opening which is not that much for a cam with extreme ramp rates. Which is extremely hard on the valve train Plus a 1.65 rr will lift the valve to 528 which is alot of lift so is 512 especally with a 2.02 valve. So would you stress something for 5 hp at the most if you dont believe me call comp and ask. And to run that much lift it is really worthless because the heads flow so well and its over board especailly on a N/A car. Its like using a 55 gallon bucket to carry a gallon of water. The only other way to put it is you WILL NOT GAIN ANYTHING TO EVEN BE CONSIDERED, with the added lift which means you are opening the valve another .032 FOR NOTHING LITERLY but EXCESSIVE VALVETRAIN WEAR . It would only make a difference with crap flowing heads and lots of compression. Ask anyone who has experence with cams unlike some poeple on this site but believe themselves to be experts.

Afr165s or 185s

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