Dr. Dan's 478
#1
Dr. Dan's 478
Dan and Bill have already posted this on FB but thought I'd put it here as well.
403 block with one of my 4.00" stroker cranks. BTR built with BTR Girdle and BTR ported Edelbrocks. Port matched Victor, 850 QF, 10.7:1, hyd roller running solid roller lifters. Not bad for a "Small Block" Olds huh?
403 block with one of my 4.00" stroker cranks. BTR built with BTR Girdle and BTR ported Edelbrocks. Port matched Victor, 850 QF, 10.7:1, hyd roller running solid roller lifters. Not bad for a "Small Block" Olds huh?
Last edited by cutlassefi; January 14th, 2020 at 04:45 PM.
#4
This crank is lighter, internally balanced, and about 30% stronger than a 330 crank. That helps everything.
Last edited by cutlassefi; January 14th, 2020 at 05:01 PM.
#6
#8
#9
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Thats the Olds combo I would build, but the block would be filled, nice work Bill. Sure like to see all the data. 478 inches, big bores make power.
Last edited by VORTECPRO; January 15th, 2020 at 07:18 AM.
#13
Last edited by cutlassefi; January 16th, 2020 at 03:16 PM.
#18
Cam was spec’d by Bill but I know it’s a Comp hyd Roller, 242/248@.050 on a 108lsa. Bill uses that cam in a lot of stuff.
Pistons were custom CP’s, dish was enough to make 10.7:1 with 70cc heads. Valves were 2.160/1.68.
Could've used more cam for sure, or at least a wider lsa imo.
Pistons were custom CP’s, dish was enough to make 10.7:1 with 70cc heads. Valves were 2.160/1.68.
Could've used more cam for sure, or at least a wider lsa imo.
#22
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No one should be surprised, I've never liked the small bore, long stroke 455 combination. The 403 block gives you a 4.351 bore standard, opens up to take a big intake valve, short stroke, small main journal, combined with a ported aftermarket head that will make power past 5200 RPM. 484 inches, big bore, solid roller, aftermarket heads, I would expect this kind of power. Does any one know if the block was filled? Measured HP was 630.
Last edited by VORTECPRO; January 17th, 2020 at 06:37 PM.
#24
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Filling the block won't hurt, be interesting to see what it does at the track. That thing does look fragile.
Last edited by VORTECPRO; January 17th, 2020 at 06:43 PM.
#25
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#26
IF (and that's a big "if") filling the block helps minimize or damp cyclical deflections and thus mitigate fatigue loading and crack propagation, then there MIGHT be a minor benefit, but don't count on it. As Mark noted, there's a full girdle. This is what increases the stiffness and strength of the bottom end. And don't confuse "strength" with "stiffness". They are two different load cases that frequently require different structural solutions.
#27
Do I dare bring up mention of the Chrysler 392 hemi? That was a window main block that was raced by many top gas and top fuel racers and held together because of the girdle and the fill; many were used in tractor pull as well, and these motors had a roots blower on top. Kudos to ya Dan. Anxious to see how she performs!
#28
Do I dare bring up mention of the Chrysler 392 hemi? That was a window main block that was raced by many top gas and top fuel racers and held together because of the girdle and the fill; many were used in tractor pull as well, and these motors had a roots blower on top. Kudos to ya Dan. Anxious to see how she performs!
IF, a stout girdle and crank could be manufactured at a "fairly reasonable" cost, 403's could become more popular. The bore size of the 403 has always been attractive, but the windowed mains have been the weakness. If Oldsmobile had cast a strong block in the 403, they could have upped the displacement "strokers" and we could have had a monster 442 engine.
......Just my two cents worth.
#29
WOW
Congrats to DR Dan and Bill.
Congrats to Mark on your stroker crank making its way in to this stout build.
Are they running aluminum rods?
Congrats to DR Dan and Bill.
Congrats to Mark on your stroker crank making its way in to this stout build.
Are they running aluminum rods?
Last edited by Bernhard; January 18th, 2020 at 11:59 AM.
#31
#32
No. The filling is above the main webs. If people were a bit more observant they would see the cyl skirts on a 403 go below the rest of the block, hence block fill would have minimal value in relation to main web stiffening as Joe said. More to the point, the epoxy used to fill the block is considerably less stiff than the cast iron, so no load gets transferred. In the same way that electrical current takes the path of least resistance, load is always transferred through the path that is stiffest.
IF (and that's a big "if") filling the block helps minimize or dampen cyclical deflections and thus mitigate fatigue loading and crack propagation, then there MIGHT be a minor benefit, but don't count on it. As Mark noted, there's a full girdle. This is what increases the stiffness and strength of the bottom end. And don't confuse "strength" with "stiffness". They are two different load cases that frequently require different structural solutions. Correct, anyone ever seen how they test airplane wings, scary!
IF (and that's a big "if") filling the block helps minimize or dampen cyclical deflections and thus mitigate fatigue loading and crack propagation, then there MIGHT be a minor benefit, but don't count on it. As Mark noted, there's a full girdle. This is what increases the stiffness and strength of the bottom end. And don't confuse "strength" with "stiffness". They are two different load cases that frequently require different structural solutions. Correct, anyone ever seen how they test airplane wings, scary!
Last edited by cutlassefi; January 18th, 2020 at 02:43 PM.
#33
The small block will always have its fan base. I still think the 350 is Oldsmobile's best engine design from the era that made it to production.
I hope DR Dan's build can hold up to track use like his other builds.
#34
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I think for a short period after the Rocket aftermarket block became available the general focus was on this amazing block.
The small block will always have its fan base. I still think the 350 is Oldsmobile's best engine design from the era that made it to production.
I hope DR Dan's build can hold up to track use like his other builds.
The small block will always have its fan base. I still think the 350 is Oldsmobile's best engine design from the era that made it to production.
I hope DR Dan's build can hold up to track use like his other builds.
Last edited by VORTECPRO; January 18th, 2020 at 04:48 PM.
#35
There was a RealOldsPower member that built a one piece lower block support that was very cool it also survived the dyno pulls.
I don't know what happened to that build.
I hope Dan's build lasts as long as his other 403 builds.
The question for the small block fans is does it make sense to build a stroker DX or Nascar block with a smaller bore.
I think the reason Dan built the 403 is because he has had success and is also big supporter of the engine. He took a lot of flack from the haters for his engine choice at one time.
#36
#37
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Here is the 403 with a Cage
http://www.mondello.com/page8.html
http://www.mondello.com/page8.html
#38
Very well know Oldsmobile racer from WA state.
This car has set records and has moved from stock to super stock
http://classracer.com/classforum/showthread.php?t=59390
Last edited by Bernhard; September 10th, 2020 at 07:19 PM.
#39