Any Stroker Experts?
Thread Starter
Intermediate
Joined: Mar 2010
Posts: 45
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From: Ontario
Any Stroker Experts?
Did a search did not find a direct answer so I thought I would ask here.
All items on the top end of a chev 350 staying the same (heads, cam, carb, ignition) if the engine made 350hp with a stock crank, how much more could I expect to gain by making this a 383 stroker motor?
Opinions? Realistic estimates?
Steve
All items on the top end of a chev 350 staying the same (heads, cam, carb, ignition) if the engine made 350hp with a stock crank, how much more could I expect to gain by making this a 383 stroker motor?
Opinions? Realistic estimates?
Steve
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Not tremendous. You need to plan a way to feed the added cubes to really do something. Assuming you were making 1 hp per cube and the parts weren't maxed out..then you could think about another 20-30 HP or so tops...but again, that depends on what was in the 350.
I've seen cases like this where peak HP stayed about the same...just came in earlier and ran out of steam earlier. Made more TQ down low....just didn't pull as hard up top.
If you're rebuilding it anyway, no reason not to stroke it...then when you add better parts you're that much ahead.
JIM
I've seen cases like this where peak HP stayed about the same...just came in earlier and ran out of steam earlier. Made more TQ down low....just didn't pull as hard up top.
If you're rebuilding it anyway, no reason not to stroke it...then when you add better parts you're that much ahead.
JIM
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Intermediate
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From: Ontario
Le Mans Master
Joined: Jun 2004
Posts: 6,231
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From: Seattle WA
St. Jude Donor '14
I don't see anything wrong with this approach.
More detail on the current configuration would help make an educated guess - in general, those 33 cubes are going to add about 33 x (current HP/CID) and a bit better than that on torque.
This assumes the top is capable of feeding those extra cubes...which is far from certain.
More detail on the current configuration would help make an educated guess - in general, those 33 cubes are going to add about 33 x (current HP/CID) and a bit better than that on torque.
This assumes the top is capable of feeding those extra cubes...which is far from certain.
Racer
Joined: Oct 2006
Posts: 435
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From: Florida
I agree with billla.
If you are going to stroke it, why not cam it up a little more to support the cubes, especially if the old cam was a factory piece. If rebuilding the shortblock this would be the time to step up to modern cam design and get you a good hp jump with the extra cubes and retain good idle characteristics.
If you are going to stroke it, why not cam it up a little more to support the cubes, especially if the old cam was a factory piece. If rebuilding the shortblock this would be the time to step up to modern cam design and get you a good hp jump with the extra cubes and retain good idle characteristics.
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Racer
Joined: Oct 2006
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From: St. John's Newfoundland
I agree with Billa...
More information on your current heads, intake, carb and cam are very important. If they can handle the added cubes, it should be no problem pulling 400 - 425 hp from a solid 383. The parts just need to work together.
C
More information on your current heads, intake, carb and cam are very important. If they can handle the added cubes, it should be no problem pulling 400 - 425 hp from a solid 383. The parts just need to work together.
C
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Intermediate
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From: Ontario
Top end includes (all brand new except the intake)
Comp Cam number 12-242-2 Intake .477 Exhaust .480 (268/280)
Weiand Intake (unsure of model but taller than stock, may replace when I get a high rise hood)
Dart Iron Eagle heads 67cc chambers with the larger valves
Comp cam roller rockers 1.5
Ignition is stock, will also be replaced with MSD over the winter when bottom end is redone.
Carb to be determined but my engine guy is insisting on a Holley. Likely a 670 if non stroker and a 750 if stroker.
All of this was just installed and the engine was started last week, could not afford to do the bottom end right away, that is going to be a winter project.
Comp Cam number 12-242-2 Intake .477 Exhaust .480 (268/280)
Weiand Intake (unsure of model but taller than stock, may replace when I get a high rise hood)
Dart Iron Eagle heads 67cc chambers with the larger valves
Comp cam roller rockers 1.5
Ignition is stock, will also be replaced with MSD over the winter when bottom end is redone.
Carb to be determined but my engine guy is insisting on a Holley. Likely a 670 if non stroker and a 750 if stroker.
All of this was just installed and the engine was started last week, could not afford to do the bottom end right away, that is going to be a winter project.
Le Mans Master
Joined: Jun 2004
Posts: 6,231
Likes: 65
From: Seattle WA
St. Jude Donor '14
OK, so the XE268H is a decent cam choice, on the mild side for a 383 as more CID can accept "more cam" without significant impact on driveability.
There are a number of different Iron Eagle heads, but the website currently shows the Iron Eagle S/S as having 165cc intake runners and flowing Intake: 210 cfm @ .500” and Exhaust: 138 cfm @ .500”
IMHO, this is not enough runner volume and not enough flow for anything other than a very mild 383...personally, I would not do it based on these specs. The Iron Eagles do respond VERY well to porting, but the runner size is a non-starter. Typically you'd be looking at 180 as a bare minium for a mild 383, 200 for a warmer one and 220+ for something where you want to make over 1.4 HP/CID.
I'd say you've got a pretty good match between head and cam with your 350; I'd stand pat.
There are a number of different Iron Eagle heads, but the website currently shows the Iron Eagle S/S as having 165cc intake runners and flowing Intake: 210 cfm @ .500” and Exhaust: 138 cfm @ .500”
IMHO, this is not enough runner volume and not enough flow for anything other than a very mild 383...personally, I would not do it based on these specs. The Iron Eagles do respond VERY well to porting, but the runner size is a non-starter. Typically you'd be looking at 180 as a bare minium for a mild 383, 200 for a warmer one and 220+ for something where you want to make over 1.4 HP/CID.
I'd say you've got a pretty good match between head and cam with your 350; I'd stand pat.
