Does any one know what size the combustion chambers and intake runners are on a 1992 351W/ trying to map out future upgrades and looking at different aftermarket heads.

thanks

Matt

 

Heads Would be a big step for these engines. What are your plans so far?
Standard first steps are cam, rockers, and long tubes. You can do that without a MAF conversion. Anything more then that and the SD EFI setup won't do. They can add ~80-100 HP if I remember right. Put a description of your truck (also in your sig when you can).

-Mike

 

The truck is a 92 F250 4x4 auto SCLB. The primary purpose for the truck is to haul my truck camper around(about 2000# loaded) or to haul my 73 Nova to the track. I already have the headers, and high flow cat planned for it. I am also planning to fabricate a cold air intake with out the restrictive snorkel of the factory intake.
With this truck I am more concerned with low end torque than top end HP. I want to go to a smaller combustion chamber to increase compression and got to an appropritaly sized combustion chamber for the cam I select to keep up intake velocity. i may stick with shorty headers to keep up exhaust back pressure to help keep up TQ. Long tubes are great for increasing flow and making top end HP. i don't go wheeling or bogging.

I will add a signature

matt

 

You may want to try a cam and exhaust first and see how it feels. Its a big jump. Heads require MAF, which adds $500-$1000 (A narrower range or ~700-800 is likely). With your CAI, make sure you do draw from outside. Traditional wisdom prefers LT's for torque. 2000# is nothing for these trucks. A tranny cooler will help. Do you know which auto it is?

-Mike

 

Yeah i have the E4od. it came with a small aftermarket cooler, but I put on a larger one. With any of these early OD tranny's I know heat is a killer. I am still in the planning and research phase. i have only had the truck about 3 months and I am still going through it. I just got the front suspension sorted out. i probably won't really mess with the engine until late this year or early next year. Like i said i am nooking looking for over the top power, but definatley some upgrade. Right now the engine runs pretty strong,

matt

 

Stock heads are E7TE castings with 62-64cc chambers, I'm not sure exactly what the runner volume is but the heads only flow about 150cfm max so they're pretty small. The stock cam doesn't come close to fully utilizing even those heads however and should be the very first thing changed along with the complete exhaust system, longtube headers are the best at boosting both low rpm TQ and high rpm HP while shorties work best at midrange rpms, so as a result longtunes are always recommended for truck applications. I wouldn't discourage you from changing heads but I can't overstate the importance of changing the stock cam, the potential gains from this alone are hugh on this vintage motor, at this point Ford was still trying to meet emissions and fuel economy goals by deliberately limiting engine output via rediculously small cams and restrictive exhaust systems, having personally done these type mods to these engines I can tell you the gains are hard to believe. With the EFI system in this truck you're going to be limited to a few particular cams however if you want to retain stock drivability and operation, but the cams available still fit the description of an RV cam with relatively high lift and short duration so you'll probably be satisfied.