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Post by silver91hatch on Apr 6, 2008 17:06:46 GMT -5
I'm building a 347 for my lil' blue coupe and I've come down to cam selection and I'm looking for some help. Here is the problem, I'm using a mexican block because of the strength but I want to run a roller cam. I'm using Trick Flow Twisted wedge heads and I'm also worried about the piston-valve clearance, but if need be I can lose some compression and run a thicker head gaskets to gain some room. But to the question/s. What do you think will be a good cam selection? Its a 91 coupe with 3.73 gears, 5 speed and will be 50/50 street strip. Also I have heard that you can't just drill and tap the block for the spider and use a normal roller cam but I just seen this on jegs and wondering what you think.... www.jegs.com/p/Ford+Racing/980348/10002/-1/10707If you think I can run it then I have roller stuff laying around and will do it myself and use either another cam or maybe a trick flow 1 or 2 cam... |
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rsw007
Pace Car
po boy racing
Posts: 131
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Post by rsw007 on Apr 7, 2008 5:33:18 GMT -5
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Post by silver91hatch on Apr 8, 2008 6:07:44 GMT -5
Well I might go with a custom grind but I change my setup too often for that I think. More of my question it why before could I not just drill tap and put my spider and factory roller lifters in a non-roller block, I had to run a small base circle cam and now they are selling a kit to do it??
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xsr
Moderator
it's only a little 150hp shot!!!
Posts: 199
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Post by xsr on Apr 8, 2008 14:47:17 GMT -5
You can drill, and run the spyder on the mexican block. We've done it on 351W blocks(non-roller). You are very limited with the TW heads, and pistons not for them.
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Post by silver91hatch on Apr 8, 2008 19:05:24 GMT -5
What about the lifters coming out of the bore and all that good stuff... I just hear horror stories. If I have to I will fly cut the pistons just enough to clear or run a thicker head gasket.
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Post by skeet92lx on Apr 8, 2008 19:05:41 GMT -5
i've always seen good results out of a TF stage 1 cam, especially seeing street duty from time to time....just my .02
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Post by silver91hatch on Apr 8, 2008 19:36:23 GMT -5
Well I just looked and looked on google and found many flow numbers of box stock TW heads and they pretty much top out at .500 lift. Mine have had the casting lines take out of the top and bottom of the runners but stock otherwise. So the stage 2 cam going to .542 its almost waisted lift and the duration would help me make the power but I would come in danger of piston to valve contact so I might just scarfice a little power to keep the motor happy. I REALLY want to run a roller cam for the 10-15 hp and the quick rev up but if its going to be a problem I will run a flat tappet, done it before. I just want a hot street car that I can beat the crap out of at the strip and will say alive for a good long while.
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xsr
Moderator
it's only a little 150hp shot!!!
Posts: 199
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Post by xsr on Apr 9, 2008 17:13:48 GMT -5
Lift is not the only thing that causes piston to valve problems. We had a .488" cam that needed deep reliefs to clear, because the valve was open so long. You are going to be very limited with the TW heads, and inline pistons. I can grind you a hyd. roller that will work, for what most decent hyd. rollers cost. PM with details, and I can get something for you, that will make great power, and will be 90% problem free. As for the roller lifters, they want come out of the block. LOL! Don't know where that came from. You just need the right cam core, to run with no problems.
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Post by silver91hatch on Apr 9, 2008 21:36:51 GMT -5
PM sent. As far as the lifter question, everybody is talking on other sites and google about "small base circle" cams in early non-roller blocks because the lifter bore is taller on late model engines to make up for the roller wheel on the roller lifters. If you don't run a small base circle cam there is risk of pushing the lifter too far up in the bore and it could stick or come completely out.
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Post by silver91hatch on Apr 27, 2008 10:03:37 GMT -5
Well, I'm going to get a cam soon, need this car on the road. I am going to just get flat tappets and save my money that I don't have, lol. Is the A9L/P computers seq. fire on the injector side or is if bank fire?? I was going to get a 302 cam but I know the firing order is different on the early model-late model 302s. So I guess its a 351W cam but they don't have as much selection with a flat tappet. Also I know you can run TW heads on a stock engine but up to what lift/duration?? Does anyone know?? I know a 347 is far from stock but its a starting point. I just want this thing to go.
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