mr2guru

iTrader: (16)

Which cam would be better suited for these heads on a 347 and why? It would also be running a victor jr. and accufab TB. Compression ratio is going to be 11.5:1


I've got both cams and am not against trying them both. But if I reach my goal right off the bat with one or the other I probably won't try the other.

Craig@ETPerformance

iTrader: (1)

Whats your goals with the car? How much power you trying to make and what times are you trying to run?

Thank you,
Craig

flyinglow57

if i know correctly.. you can only use the t-rex with Z06 heads or you have to cut the pistons correct?

so looks like you gots to go with the other cam.

WS666

iTrader: (14)

Check out SlickVert's setup. He is running the Trex and the ET 215's. And that heavy car just flat out moves...

IIRC, his pistons were flycut, but that was for his stock 15* heads. No need to flycut with the 11* ET's.

mr2guru

iTrader: (16)

There is actually quite a bit more clearance than even an unmilled stock valved head.

But regardless it's mating up to a shortblock with the correct flycuts for 11* ET heads.

orangeapeel

iTrader: (18)

Don't make statements you know nothing about.

SlickVert

iTrader: (5)

Both cam will fit with ET 215, but I would still check PTV.
The issue is the ET 215 is a awesome heads and flows great numbers
.
The T-Rex cam was decided for max effort with the lower flowing of the stock head, but the valve events on the T-Rex are great and has great lobes (XER).

Ideally, maybe a slightly small duration cam would be better. I am not sure what the valve event are on the 233/239 cam are or what type of lobes.

I would call Geoff @ Thunder Racing he can answer your question best.

If I had two chose between the two, hands down T-Rex
ET 215 and T-Rex will get the job none!
Is it the best combo?
Bob

SVT THIS

iTrader: (27)

Your times make me want your heads!

mr2guru

iTrader: (16)

126 is pretty healthy. Did you get the high rpm valvetrain stability issues worked out? This is going in a 2675# car so I hope to trap about 132-135 range off the bottle.

half-n-half

iTrader: (7)

would someone mind elaborating on how the cam is designed for heads with low flow numbers? and how would anything in that case not work just completely better with higher flowing heads...just a little confused about that.

thanks
Louie

Patrick G

iTrader: (14)

If you're running a single plane intake, you'll want different valve events than either of the cams listed. Fireball has done extensive testing with a 346 using a single plane intake and ported heads. He found the T-Rex to have too late of an IVC to make good power under the curve with that intake. He's got a new cam with a VERY narrow LSA (think less than 107) and his results look very promising. I would check out his progress before you make a cam decision.

mr2guru

iTrader: (16)

Thanks patrick, That is one option but of the two I already have.... I am going to try one. They are both used anyway, so I am not really losing anything by trying them first to see if my goals can be met. ~470whp.

Of the two I have the 233/239 comes up with a DCR of 8.6x and the TRex a 8.4x I am almost inclined to try the 233/239 with the higher DCR. But then again the TRex has been 'proven' on the ET215s at 58cc.... hrmmmm

Fireball

iTrader: (21)

that was with a LSX intake....the vic jr responds totally different based on what I've seen.

plan on revving to the moon if you put the trex in @ 108-110 ICL with the vic.