Black Baja, out of curiosity, how and what would you do to modify the tails?

I'm not dickin' around with my exhaust. I ran a 132561 cam with the same exhaust and had no issues.

Summit Racing Part Number: CRN-132561
Intake Duration at 050 inch Lift: 228
Exhaust Duration at 050 inch Lift: 236
Duration at 050 inch Lift: 228 int./236 exh.
Advertised Duration: 298 int./306 exh.
Valve Lift with Factory Rocker Arm Ratio: 0.530 int./0.551 exh.
Lobe Separation (degrees): 114

Summit Racing Part Number: CCA-11-314-4
Intake Duration at 050 inch Lift: 232
Exhaust Duration at 050 inch Lift: 237
Duration at 050 inch Lift: 232 int./237 exh.
Advertised Duration: 280 int./288 exh.
Valve Lift with Factory Rocker Arm Ratio: 0.547 int./0.547 exh.
Lobe Separation (degrees): 110

At .050 the new cam is 4* bigger on the intake and 1* bigger on the exhaust. Its the 110 vs 114 lobe sep that makes me wonder if it will work.

even though it is supercharged it is still in vacuum at low rpm and can revert water.

only problem i see with that is whatever warranty he has will be void if he changes the cam.maybe the builder had that in the back of his mind when he installed the comp cam.for the life of me i can,t see why the builder did not install the cam the op asked for.

I thought about that too. If I open it up and have problems later on, he will say "you should have left the cam I put in there. Too bad!"

Other than "this is the cam I put in" did he ever give you an explanation of why he felt one cam was better than the other, pros cons? It seems strange he would swap cams without a word about why (the after the fact part without consent when I had done my research would chap my A$$ BIG time).

He just stated "I don't like Crane Cams. This Comp cam is better." I just had the part number when I picked it up. So I just assumed the cam numbers were equal and he just prefered Comp. I thought they were the same cam, just different brands. Then I compared the specs when I got home.

Part Number: CRN-132561
228, 236 at .050"
0.530", 0.551".
LSA 114
Overlap at .050" 4°

big question,,who is the engine builder?

he'll blame your exhaust when it has problems and will not honor the warranty.

you extend the inner pipe about 3-4" past where the water enters the pipes.or just go full dry.

Steve Damon out of Little Valley NY. He used to run the "one hot tomale" car. He had a ton of marine motors in the shop and came highly recommended.

For the record- I have not called him with my concerns yet. I am going to call him tomorrow and ask him to put in the cam I asked for. As of right now the issue has not been addressed. I have just been trying to figure out if his cam will be ok.

Just to clarify, I am not running Merc exhaust. I am running EMI manifolds with these risers. I know they are better than stock, but how much better?

http://i880.photobucket.com/albums/a.../image.php.jpg

I think I would revisit the builder and ask for a warranty in writing while expressing your concerns. He didn't follow instructions and billed 25% over estimate. If he refuses I'd change the cam and out him.


oops , guess I was too slow.

By law, I'm only allowed to be within 10% of estimate without approval.

Did you see my post this AM:

Comp 11-314-4 280ah-10 Hyd Flat Tappet
232°, 237° at .050"
Valve Lift .547", .547 "
LSA 110°
14.5° Overlap at .050"

Crane 134561 H-296-2 Hyd Flat Tappet
236°,246° at .050"
.553", .571"
LSA 114
13° Overlap at .050"

Part Number: CRN-132561
228, 236 at .050"
0.530", 0.551".
LSA 114
Overlap at .050" 4°

Sutphen 30, Thank you. "you extend the inner pipe about 3-4" past where the water enters the pipes" That is exactly some of the mods Eddie at Young Performance and I discussed on Friday as he will be reworking my Stainless Marine Tails.
Sorry for the off post-kinda-replies.
On Post,
Better Cam? What does that mean? Structural, Longevity, HP, Torque, Easy on Lifters and Valve Train, RPM range for Tq/Hp, Flow velocity Volume?
Better for whom?

I did but don't remember seeing the info on the 132561 cam. The difference between the 134561 and the 11-314-4 is not very much. The difference between the bigger cams and the 132561 is significant.

i did exactly that with the identical exhaust on a 516 cu in build i did that used a hp500 cam and it still got reversion,switched to a different exhaust and no more reversion.the new exhaust was dry to the tip.i know of several boats running the cam the op asked and paid for with no reversion issues,imo the fix for this is to install the cam the op asked for in the first place.with the engine on a stand it should not take more than 3 hours.

the hp500 cam,was it a carb'd version or efi?carb'd version was known to revert.

You have to get more specifics from the builder. If I just paid a guy to put an engine together that could soon blow up and waste my money, I would have a lot more questions. To say one cam "brand" is more or less favorable should deserve a sit down conversation with an answer that elaborates a LOT more on the problem and not "just because".

The fact that you are going to spend probably $500 to $1500 by the time its all done with shipping cost to get your tails welded isnt the right fix to the root cause. You shouldnt have to do that. Matter of fact, it shouldnt even be an option.

Compare the EVC timing events of the 2 cams. The longer the exhaust valve is open while the piston is travelling down, the more reversion you can get. Next question after that is did he degree the cam "straight up". It is possible he advanced the cam some to reduce evc angle and therefore reversion.

The fact that there are so many "what ifs" with his cam makes me not want to bother. It's getting the cam I specd one way or another. 60 posts and not one person said his cam will be fine.

I have an extra oil pan gasket. The lifters that came with the shortblock are still in the box so I could use them with any cam. I would just have to buy a timing cover gasket and the cam. So even if I have to eat it I will. For $160 in parts I am going to swap it.

Kinda boggles my mind as why he would use a cam meant for NA in a blower motor? I am sure comp cams even has a better cam than that. I ran a 110 LSA on an NA motor with the same exhaust, difference being the tails were modified by EMI with reduced water discharge. It did not revert, the cam was solid roller large duration 255/265 and around .650 lift.

Comp sells a forced induction cam that is identical to the one he put in except it's on a 114 lobe sep.

When I spoke with him he said "you'll be happy with it. It will make 510hp" I said that I am supercharged with 5psi of boost. He replied " oh you'll make 620 then". Like he forgot I was running a blower.

builds real confidence.

All else aside 2 big mental factors for me would be:

1) Every time I did an all out run I would wonder "How would this thing run with the engine I designed?" I would never get over that until I changed it back to my build.

2) If it reverts with my build, I own it and it is my problem. If it reverts with his cam I would ALWAYS feel "You sonsa-a-beach!!!", I should have known better!

Of course on Monday with your discussions with him maybe he can shed satisfactory insight.
Best of luck and let us know what he says.

Yeah, not cool, so with a small blower like that he just adds 110hp?

Mild Thunder dynoed a pair of 454s just like mine with the cam I requested. They made 590hp.

I am not discounting that with the specified cam, I am discounting the generalization of adding a 110hp on a cam that is much better suited for an NA. The 132561 is a 525sc cam, and would not be a bad choice either. The 110 LSA is sending power out the pipe.

I have a 132561 that came out of the motor before rebuild. I was hoping to pick up hp with the 134561 though.

is that not how it works? the engine in my car started out as a 300 hp crate motor but according to the ads my headers added 50 hp, the intake was good for 25 hp, the carb was good for 10 hp, my roller rockers made an extra 15 hp, the super swirl-a-tron induction added 60 hp and the electric super charger netted me another 100 hp so now I have a 560 hp small block that idles perfect and revs to 8000 rpm. someone on the internet built one just like it and did a youtube video so it must work.

yep,if it is on the internet it must be the truth,lol.

don't forget the 28hp in a bottle,,the real snake oil.:D

I would say a supercharger is a legitimate power adder.

well it helps if you seem like a couple of good guys.:daz:

N/A Imco Powerflow with silent choice. That was know up front. It sure did sound sweet though!!!!!!!!!!!!!!!!!
Mark

You spent too much money.

Underdrive pulleys, headers, K&N, and Flowmasters makes it the fastest car in town. Been this way since the Fox body came out.