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Tldr: Is there a stroker kit that is too large for these heads given that the heads supply a specific flow of air and fuel and too large of a stroker kit would demand too much air and fuel?
Hello folks, I'm in the middle of a 351w rebuild for my 1983 ford f350. I'm not a mechanic and I dont know a lot of fine details about rebuilding engines and introducing new parts. I have amassed a number of parts and have a few parts left to buy, I will provide details below. My goals for the truck is something to be daily driven, with a little bit of off roading thrown into the mix; some weekend warrior stuff and the occasional off road vacation. No high rpm revving, no huge rock crawling, no deep mud. I drive about 10,000 miles a year because I live in a small town and everything I need is less than a mile a way and I walk to work every day. Im saying this to say that I don't put that much wear and tear on my engine. As a result, I've bought a few parts prioritizing torque over horsepower. I want to use pump gas. I'm working on figuring out the final parts for the build, and I wanted to replace the crankshaft. I figured if I'm going to replace the crank, why stay stock? Get a stroker kit and make more power for the same amount of money. I want to stay around 400 horsepower, as this is a daily driver, but it wouldnt necessarily be a problem if I made more than that. I want to know if I can upgrade to a 408 or even a 427 stroker kit with these parts given the parameters I've set for myself.
Attached is info on the cylinder heads and camshaft.
Edelbrock 60329 head is standard Performer, not RPM. Those will hold it back a bit if going stroker.
I had built a 393W stroker for my daily driver waaaaay back in 2006. Why? 393W is about the cheapest stroker kit you can get. I found a 'blem' 3.85" stroke crank - it was .010/.010 under, so it actually cost less than having my stock crank turned! Back then the 393W stroker kits were either 8.0 for blower duty, or 10.5 and above. I perused the various piston makes and found a Keith Black 364 22cc dish that would get ~9.4:1 with 64cc heads. The place that had the crank checked my math (stroke, compression height, deck height, piston volume, chamber volume, etc) at said "Wow!" 'My' kit is now a regular cataloged item there at cnc-motorsports.com !!
I had initially used the X4262H cam, combined with 1.7 rockers for a bit more lift to help with the added cubes of the increased stroke.... I needed to keep the duration short to pass my state's sniffer emissions testing. I had found a smoking deal ($400) on a pair of professionally-ported World Windsor Senior iron heads,topped with a used Performer intake, Holley 670 street avenger, BBK shorty headers, catted H-pipe.
I daily-drove this for several years.
When the car became age-exempt from emissions testing, I upgraded to a XR276RF-HR retrofit hydraulic roller cam, still with those 1.7 rockers. That really picked things up!
While it isn't a linear relationship a larger engine will move more air and make more torque and horsepower regardless of the restriction.
Here's a good example: A few years ago I built a 454 cubic inch small block Chevy intended for a jet boat application. It made 630 horsepower at 5700rpm and 630lbs/ft torque at about 4500. While I had it on the dyno just for fun I did a few pulls with a gauge legal 4412 two barrel carburetor(1/2 of a 750 4 barrel) just to see what it would do and it made 530 horsepower. The 355 inch engine that normally uses that carburetor makes 500 horsepower but that took about 1000 pulls worth of work to get there vs just bolting it on.
Another time that I can think of was when I was helping a guy who had to run a 10hp Techumseh flathead in a go kart class. As a test I ran the carburetor on a 454 Chevy that I had on the dyno at the time. This engine was from a jet boat and it made about 500 horsepower at 5000 or so rpm. With the little carburetor it still managed to make over 60 horsepower at about 2300rpm and it would rev to about 4500 rpm with the carburetor wide open. That's an extreme example but 60hp is a heck of a lot more than 10.
While it isn't a linear relationship a larger engine will move more air and make more torque and horsepower regardless of the restriction.
Here's a good example: A few years ago I built a 454 cubic inch small block Chevy intended for a jet boat application. It made 630 horsepower at 5700rpm and 630lbs/ft torque at about 4500. While I had it on the dyno just for fun I did a few pulls with a gauge legal 4412 two barrel carburetor(1/2 of a 750 4 barrel) just to see what it would do and it made 530 horsepower. The 355 inch engine that normally uses that carburetor makes 500 horsepower but that took about 1000 pulls worth of work to get there vs just bolting it on.
Another time that I can think of was when I was helping a guy who had to run a 10hp Techumseh flathead in a go kart class. As a test I ran the carburetor on a 454 Chevy that I had on the dyno at the time. This engine was from a jet boat and it made about 500 horsepower at 5000 or so rpm. With the little carburetor it still managed to make over 60 horsepower at about 2300rpm and it would rev to about 4500 rpm with the carburetor wide open. That's an extreme example but 60hp is a heck of a lot more than 10.
That carburetor size thing made me chuckle a bit, remembering back to the days of outboard boat motors of the '60s and '70s. Many states had restrictions on the size of outboard motors on their inland lakes - usually 'must be less than 10hp'. That gave rise to the 9.9hp outboards from Johnson/Evinrude, Chrysler, Mercury... They simply put a tiny-throat carb from a 5-7hp engine on their respective larger displacement 15hp engines. Voila! 9.9hp rating! A simple carb swap and you gained 50% more power to one of those 'compliance' engines! Needless to say, they sold a lot of 'replacement' carburetors for 15hp engines!
That's funny about the 9.8. We've got an old one of those that used to belong to my grandpa. It runs really nice on a little boat for fishing. One of my customers with a jet boat had me come for a ride with him right after I had built him an engine. We went to this lake and at the boat ramp there was a sign stating a 10HP limit. He just wanted to test it out and when I pointed out the sign he said, "we'll just get in and outta here real quick"!..
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