When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
One thing to consider when you make your choices is matching everything. I personally think a 850 carb is to big. I can't imagine you spinning this motor fast enough to need that much room. SOOO:
Carb has to match engine built and how engine is going to be used.
Valve springs have to match cam.
cam has to match where the engine is going to be used(RPM).
torque convertor (stall) has to match the cam (RPM they both "come in"), vehicle weight, engine power, etc.
One thing to consider when you make your choices is matching everything. I personally think a 850 carb is to big.
Yep....totally misspoke...make that a 780 holley. And Yes! I understand most of the ramifications of the importance of the cam and the influences on the ENTIRE build....why it's soo much more complicated than I had ever imagined.
As Barry R says, "build the engine around the cam..."
For your towing duties I recommend finding the torque converter with the lowest possible stall speed. Even if that doesn't necessarily match the cam. A slipping/ Stalling converter creates TONS of heat, and heat is the number one enemy of the automatic transmission.
Cleveland,
Thanks for that info...I was wondering about that...I'm planning on a remote tranny cooler with a fan
Definitely wouldn't hurt. If your buying a new radiator, get one with an internal trans cooler too. Oil to Water coolers are way more effecient than Oil to Air.
For your towing duties I recommend finding the torque converter with the lowest possible stall speed. Even if that doesn't necessarily match the cam. A slipping/ Stalling converter creates TONS of heat, and heat is the number one enemy of the automatic transmission.
2X on the heat but that's what a trans cooler is for. I wouldn't go quite to the extremes as you. With a torque convertor with way to low of stall speed it will be doing it's version of locking up before the higher RPM cam is helping the engine. AKA "coming in". The result is doggy off the line (race car) or from a standing start (towing). In this case getting the trailor the OP may be pulling to get moving. I understand 428's are torque monsters but I'd want to take full advantage of it. Too low a stall equals torque convertor coming in too soon. Too high a stall equals torque convertor coming in to late and slipping.
I suggest to OP once you pick your cam and engine combo use Mike's help above to figure out the power you will have and contact the tech line at the torque convertor company of your choice. Note, the "stall" speeds of aftermarket high stall convertors is based off of a 350 CID engine. And we are talkin' 428 here.
I went with a stock stall converter when I put my AOD in. Advertised at around 1800, but in actuality it's about 21-2200. I could use more for all out performance. But it pulls like an ox!
I went with a stock stall converter when I put my AOD in. Advertised at around 1800, but in actuality it's about 21-2200. I could use more for all out performance. But it pulls like an ox!
I remember the 1st time I felt a cam Come In. Back when I was working at Franklin Park L/M in Toledo, Ohio I was about 20/21. One of my mechanic buddies had a 70's Chevy 4X4 with a 350 belly button motor and A/T. He put a cam in it but no convertor and was happy as a lark. He took me for a test beat to show me. He nailed that chebbie off the line. What a DOG it was at first. I thought . Then about 1/2-3/4 way through 1st gear all of a sudden it started pulling hard and the q-jet was wailing. While this would be fun it wouldn't be very tow/haul friendly.
This Hennessey Takes the Expedition Tremor's Off-Roading Capability to the Next Level
Slideshow: The VelociRaptor Expedition gains a lift, upgraded suspension, Brembo brakes, and trail-ready equipment while retaining the stock 440-horsepower EcoBoost V6.
Rezvani's Latest Post-Apocalyptic Monster Is a Ford F-150 Raptor Underneath
Slideshow: Called the Fortress, the 850-horsepower pickup combines Raptor underpinnings with military-inspired features, survival equipment, and a starting price of $285,000.