Speedmasters are probably the only cheap option but you need to run rockers for push rod oiling or do some mod to get oiling to the head unless your magnum happens to have the LA oiling holes.
360 street build, please critiec
- Thread starter gregsdart
- Start date
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gzig5
Well-Known Member
Budget is a non-definitive term. Post your price point restriction. My ProMaxx 171s with 2.02" intake valve are at 270cfm from .500-.600 after a little port cleanup and unshrouding in the chamber. Standard Speedmasters would probably react the same with similar work. I can't comment on the SM CNC version. The ProMaxx Shocker CNC will hit about 285cfm but have a bigger valve. Be assured that you will likely need geometry correction with any of the Edelbrock knockoffs which adds a not insignificant cost. The shim kit is around $250 and the shafts usually need to be slotted, which I don't think is included in that cost. The Trick Flow heads have that correction built in and if I were to do it again, I would have just got the TF and would have been ahead of the game in cost. Only thing that saved me is getting the PM 171's used for less than half of new cost.
Shade... LOL Somebody is grumpy. 
Reality is that back in the early 2000's, it was a FACT regarding westech and supported by the DF article, EM issues and our experience with them back then. Westech got it fixed and is good now.
A sharp dyno operator can do what they want with some of the software factors involved, another fact. If you wish to bury your head in the sand and say that overstatement isn't a possible issue with these "tools" then cool. There are good and bad actors in every part of the testing population. Most are good guys at what they do. Use dynos for what they are and note the changes you make during a session and resulting output. The MPH at the track will help with whether the output was accurate.
Carry on
Sorry about the off course with your thread Greg.
The head is going to be your break point for output. 450 might be a bit tough to hit if the head is choking it.
Reality is that back in the early 2000's, it was a FACT regarding westech and supported by the DF article, EM issues and our experience with them back then. Westech got it fixed and is good now.A sharp dyno operator can do what they want with some of the software factors involved, another fact. If you wish to bury your head in the sand and say that overstatement isn't a possible issue with these "tools" then cool. There are good and bad actors in every part of the testing population. Most are good guys at what they do. Use dynos for what they are and note the changes you make during a session and resulting output. The MPH at the track will help with whether the output was accurate.
Carry on
Sorry about the off course with your thread Greg.
The head is going to be your break point for output. 450 might be a bit tough to hit if the head is choking it.
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Looks like my son and I may get the original 340 and car back! Word is the owner rebuilt the 340, had the heads ported, and put a nice sized cam in it, but never fired it. So we may just inspect that motor, and use it to start. I posted here about getting the car back in another thread.
I saw that and comment in your other thread. That's cool stuff! I would certainly inspect all of it. Too expensive to redo. It'll only cost a gasket set now.
Total teardown and inspection is a definite must, IMHO. We will be hot rodding an original block and heads. Not super high stress, mind you, but any issue can potentially hurt an irreplaceable block or heads.
Shocker 185 Mopar CNC (Sold in Pairs) - PROMAXX Performance Products
Click flow rates
Or use the Trickflow heads
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