Thread: Good Combo?

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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.

Originally Posted by techinspector1

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

I'll second that....

Originally Posted by techinspector1

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

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....

Originally Posted by techinspector1

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

Thanks, read through the post...

Originally Posted by techinspector1

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

: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?

Originally Posted by tubbed55

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

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

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?

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!

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

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.