I once owned a 190 Boss 302. It was terrible in the rain and nearly impossible to drive in the snow. The rear window slats got quickly covered with snow making it impossible to see out of the back window. The Boss 302 had a terrible engine and I blew it up twice. It had too much horsepower for that small engine and it just could not stay together. It also had no factory A/C or Power Steering making it hot to drive in Summer and park. Terrible gas mileage!
69 boss spec heads had grossly oversized valves, the small block needed to turn an incredible amount of RPMS just to begin to use the port/valve sizes effectively. 70 heads have a reduced seat/valve diameter the ports aren’t that much different. The 70 heads make the 302 CID engine more responsive at lower rpms.
Yes, stroking the engine is indeed what you said it is. A side effect of the stroking also means that the mass of the piston decreases due to a smaller compression height. (height of wrist pin center to the top of the piston) This effectively reduces the moment of inertia for the reciprocating assembly. Other factors that may weigh in on the results include materials and conn rod design.
never heard of ‘rod to stroke’ ratio. the fact is that stroking involves moving the center line of the conn rod bearing to a location further from the crank’s rotating center line. this means that the conn rod assy is thrown further than original spec, making conn rod assy inertia a much more considered part of rpm potential. the fact that the conn rod assy is moving even further than it was means that there is MORE ‘resistance’ to overcome. (also), ’69 boss head specs are a world away from ’70.
You can rev the piss out of a 331 because of its rod to stroke ratio and relatively light pistons, this means that there is less inertial resistance working against a change in rpms.
Couple this with the boss302 heads large ports and you have room to breathe.
70 heads were better at low RPM (smaller valves) yea the 69′s did not come alive until 5000 but that engine pulled like a run away freight train!! A friend had a 69 Cougar Eliminator that I took for a spin and I do mean thats all that car wanted to do!! SPIN!!
really nice build. It’s great to see someone using a Boss 302 instead of standing around polishing it and talking about concours show garbage.
Great looking and running car.
Hey guys, thanks for the compliments!! I just happened to stumble over this, while surfing around after googling my co. name, which I do from time to time. lol
Anyhow, we built that engine, the car is owned by a local guy, he really drives the hell outta that car, that was the owner behind the wheel. I LOVE when we build them and the they don\’t just sit in a garage!
That combo was pretty stout, it has a solid roller in in, what the specs were, I don\’t remember, but it was built as a very solid combo and still runs great after a few years of street beating..
Anyhow, thanks again for the kind words, I\’m outta here!
This car is amazing. Pure muscle
I once owned a 190 Boss 302. It was terrible in the rain and nearly impossible to drive in the snow. The rear window slats got quickly covered with snow making it impossible to see out of the back window. The Boss 302 had a terrible engine and I blew it up twice. It had too much horsepower for that small engine and it just could not stay together. It also had no factory A/C or Power Steering making it hot to drive in Summer and park. Terrible gas mileage!
69 boss spec heads had grossly oversized valves, the small block needed to turn an incredible amount of RPMS just to begin to use the port/valve sizes effectively. 70 heads have a reduced seat/valve diameter the ports aren’t that much different. The 70 heads make the 302 CID engine more responsive at lower rpms.
Yes, stroking the engine is indeed what you said it is. A side effect of the stroking also means that the mass of the piston decreases due to a smaller compression height. (height of wrist pin center to the top of the piston) This effectively reduces the moment of inertia for the reciprocating assembly. Other factors that may weigh in on the results include materials and conn rod design.
never heard of ‘rod to stroke’ ratio. the fact is that stroking involves moving the center line of the conn rod bearing to a location further from the crank’s rotating center line. this means that the conn rod assy is thrown further than original spec, making conn rod assy inertia a much more considered part of rpm potential. the fact that the conn rod assy is moving even further than it was means that there is MORE ‘resistance’ to overcome. (also), ’69 boss head specs are a world away from ’70.
Actually the big block coupes and convertibles are much more rare than the boss429.
You can rev the piss out of a 331 because of its rod to stroke ratio and relatively light pistons, this means that there is less inertial resistance working against a change in rpms.
Couple this with the boss302 heads large ports and you have room to breathe.
Not only were the 70 heads better, but the increased size of the engine (331) fits these heads like a hand in a glove.
Up until recently 1967-1970 were the bad-ass years for factory hot rods.the new mustangs are hot…..but not many can afford the originals…..
wow my dream car since I was 10
70 heads were better at low RPM (smaller valves) yea the 69′s did not come alive until 5000 but that engine pulled like a run away freight train!! A friend had a 69 Cougar Eliminator that I took for a spin and I do mean thats all that car wanted to do!! SPIN!!
Oh, thats OK…well, alright its more than OK…well, actually that’s pretty fucking fast.
Huh? Do you know how many of these were made compared to the other mustangs of ’70? The only rarer mustang in ’70 is the Boss 429.
those aint rare i see them more than normal ones
the tags attached to the description section of this video read: 1970 Boss 302 Mustang Fast street car rare tits ass nude sex
that’s basically it cause this car is the sex hands down!
casting dimensions (flow) and whatever else. please bother with at least a little research.
really and why is that???
Because…..?
’70 Boss heads don’t flow like the 69s.
Great job.
Sounds awesome man. What RPM do you shift?
really nice build. It’s great to see someone using a Boss 302 instead of standing around polishing it and talking about concours show garbage.
Great looking and running car.
Why would you need to do anything to the giant huge monster ports of a boss head???
You can rev the piss out of a 331 though.
Crazy cool ride!! That thing must be a hell of a ride!!!
Hey guys, thanks for the compliments!! I just happened to stumble over this, while surfing around after googling my co. name, which I do from time to time. lol
Anyhow, we built that engine, the car is owned by a local guy, he really drives the hell outta that car, that was the owner behind the wheel. I LOVE when we build them and the they don\’t just sit in a garage!
That combo was pretty stout, it has a solid roller in in, what the specs were, I don\’t remember, but it was built as a very solid combo and still runs great after a few years of street beating..
Anyhow, thanks again for the kind words, I\’m outta here!
Edward Miller
TheEngineWorks.com
772-380-9111