Good Combo?

I am building a 1955 Chevy Truck Prostreet look. The truck has a Ford 9" 4.11 gears with 31X18.5X15 tires and a 400 Trans. With maybe a 2800-3000 stall? I will use the truck manly for driving to the meets and shows with very little track time. I want a nasty idle and good power. I am gathering all my parts for my motor build. Here is what I was thinking and would appreciate any input on what to add or change. I am using a 454 40 over block, stock stroke, stock rod size. I will shoot for 10.0 to 10.5 compression, I have a set of Merlin 320 CC iron rect port heads, A Weiland Team G dual plane intake and was planning on using a Mighty Demon 825 carb DS or VAC? I want to use a Roller Hyd camshaft. I was looking into the Big Mutha Thumper but maybe something is better? Thanks, Ronnie

My history of answering Thumpr cam inquiries isn't pleasant, so I'll leave this to someone else.

I did one of these a few years back with a blown BB. My only comment would be with iron heads hold the compression to 9-1 or you'll be fighting the "death rattle" with 93 octane fuel. Use good rods, or at least ARP bolts, and spend on a steel crank. Otherwise, have fun!!

Forgot to mention, I used a Camaro front frame clip!:D

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Originally Posted by techinspector1

My history of answering Thumpr cam inquiries isn't pleasant, so I'll leave this to someone else.

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I'll second that....

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Originally Posted by techinspector1

My history of answering Thumpr cam inquiries isn't pleasant, so I'll leave this to someone else.

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I am here to learn the good and bad. If something would be better then I am all ears.. Have not heard anything good or bad about the thumpers..Thats why I asked...

Here is what I have so far.. Thanks, Ronnie

I'll send a thread link to your PM....

look at something like this 238/246 @050 621/621 lc 108 or 226/234 @050 604/604 lc 108 i try not to build for sound but what makes power

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Originally Posted by techinspector1

I'll send a thread link to your PM....

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Thanks, read through the post...

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Originally Posted by techinspector1

my history of answering thumpr cam inquiries isn't pleasant, so i'll leave this to someone else.

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:lol: :lol: :lol: :lol: :lol: :lol: :lol: :lol: :lol: :d :d :d

How about Comp Cams Magnum 304 HR 244/244 @50 612/612 110 LC?

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Originally Posted by tubbed55

How about Comp Cams Magnum 304 HR 244/244 @50 612/612 110 LC?

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..NO THANKS.. :D i use ERSON or crower or isky or howards anything thing but comp.but you can use it :D

Been trying to do some research on Static and Dynamic compression. Someone recommended I use a Lunati Hyd roller cam with 241/249 625 lift on 110 LC. He said with my combo and this cam this is what I should do...

.." Based on the cam being installed straight up and not degreed:

10.49 static compression would net you 7.42 dynamic compression.

10.99 SCR would net you 7.76 DCR

11.5 SCR would net you 8.11 DCR

12.0 SCR would net you 8.44 DCR.


You should be ok running up to 8.5 DCR with pump gas. With doing that, you are going to gain a bit of bottom end and also a little more up top. Just make sure your tune is solid."

Does sound Ok? and if I am reading this correct I should be piston shopping for a 11.5-12.3 piston?

Dang Pat; Your the only other guy besides my self that I've seen uses erson,
formally Sig Erson. I've mostly used the TQ series ersons, though I did run the High flows in my big block Charger back in the day. But I like the broad power band that Isky has,
though I have never used one of thier cams. Kurt

Pat McCarthy is the BBC expert, I am not. But I was thinking about this and it seems to me that with 119cc open chamber heads, you'll have to use a ton of dome to get the static compression ratio you're thinking about. Problem with a dome is that it gets in the way of flame propogation across the chamber in my opinion. I'd be more inclined to pull back on the SCR and use less dome and one of the cams recommended by Pat. Maybe someone smarter than me will weigh in on this.

Not my original words, but an excerpt from an article in Corvette Fever magazine that underscores Techinspector's concerns:

"An important concept to understand is that combustion is not an explosion. Ideally, it is a flame wave, initiated by the spark, which burns across the combustion chamber. This smooth burning generates the rapid rise in cylinder pressure during the power stroke.

Knock is the negative result when combustion occurs somewhere else in the cylinder, in addition to the plug. Like the spark-plug-initiated flame wave, the second wave expands so a collision between the wave fronts occurs. This collision produces a radical spike in cylinder pressure. Instead of a firm, even push down on the piston, the pressure spike hammers it down. This is strong enough that it can ultimately burn a piston, crack a piston ring or ring land, or a spark-plug electrode. These excessive pressure spikes can damage even engine bearings. When you hear a metallic rattle while driving, that is the sound of detonation and, in most cases, the cure is fuel with the correct octane.

One mechanical aspect that affects compression is the piston top. A dish increases cylinder volume, which reduces compression. In contrast, a domed piston decreases volume and increases compression. If detonation occurs, the piston top, ring land, or rings can be physically damaged due to the excessive pressure shocks created by colliding flame waves."

You may want to reconsider the domed pistons in favor of flat tops.

to get to 10.5 is like falling off a log with a 454 you have bore and stroke on your side a 340 dome will get you 10.2 working down the heads and deck will get you close i have used big domes 14.8 cr to flate tops that up to you

I have decided to go with the Erson 238/246 @050 621/621 lc 108 that Pat suggested. I have a friend that is going to give me a set of headrs that will fit the frame wells of my truck. I am sure they are not the best for my application but they were given to me. They were bolted to a motor but never started. They are ceramic coated "Rewarder" brand block huggers. When I measure them they have 1-3/4" primaries and 2-1/2" collectors. I am measureing the collector inside diameter? Will these at least work for me or should I just wait and save money for another set? Unsure If I use them and they suck then I would not be able to sell as much as if they were on a unstarted car.