318/360 Crank/347 running on Dyno

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It was cool to see a dyno of a Mopar SB with the 60401 Voodoo cam as I have used that same one in both a stock-bottom-end 318 with 302 heads and my current 10.5:1 Magnum-headed 360 with great results.

This also lets me know that my 360 needs a bigger carb and fixed exhaust (crushed half-assed downpipes off Hedman shorty headers) to get it to pull over 5000 RPM... Apparently yours had peak HP at 5300 RPM with a smaller bore and less-flowing heads, "hmm verrry eenteresteeng" lol
 
MOPEkidD-3 said:
It was cool to see a dyno of a Mopar SB with the 60401 Voodoo cam as I have used that same one in both a stock-bottom-end 318 with 302 heads and my current 10.5:1 Magnum-headed 360 with great results.

This also lets me know that my 360 needs a bigger carb and fixed exhaust (crushed half-assed downpipes off Hedman shorty headers) to get it to pull over 5000 RPM... Apparently yours had peak HP at 5300 RPM with a smaller bore and less-flowing heads, "hmm verrry eenteresteeng" lol
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Good observations. Shorty headers usually make tons of low end at the expense of high rpm power.(I know that is not what we are taught). No comment on the carb because I don't know what you are using now. If it is smaller than a 600 cfm than yes you do. More likely you need more valve spring first. J.Rob
 
That 318 is going to be lots of fun on the street , and reliable . Those are pretty good numbers you're getting . Should light up the tires easily .
 
RAMM said:
Good observations. Shorty headers usually make tons of low end at the expense of high rpm power.(I know that is not what we are taught). No comment on the carb because I don't know what you are using now. If it is smaller than a 600 cfm than yes you do. More likely you need more valve spring first. J.Rob
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Thanks for the reply I currently have a vintage Carter AFB 625 cfm on the engine, I'm thinking of getting a ~700 cfm double pumper when I start to hit the track again. The valve springs are the Hughes #1110 I believe they are straight single w/damper, 110# on the seat and 315# at .500" lift or something along those lines so shouldn't be an issue there. As far as the exhaust the headers can't breathe properly as the guy who welded it in (not a performance specialist for sure) used the puny <2" collectors that came with the headers instead of 2.5" like I asked. The downpipes have lots of sharp turns of course and are now smashed up from the road pretty bad.
 
MOPEkidD-3 said:
Thanks for the reply I currently have a vintage Carter AFB 625 cfm on the engine, I'm thinking of getting a ~700 cfm double pumper when I start to hit the track again. The valve springs are the Hughes #1110 I believe they are straight single w/damper, 110# on the seat and 315# at .500" lift or something along those lines so shouldn't be an issue there. As far as the exhaust the headers can't breathe properly as the guy who welded it in (not a performance specialist for sure) used the puny <2" collectors that came with the headers instead of 2.5" like I asked. The downpipes have lots of sharp turns of course and are now smashed up from the road pretty bad.
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A 600 or better yet 650 Holley will be worth 10-15 hp and likewise in tq over the Carter. As much as I hate to say it Holley's are better mixers. You're right thinking the springs you have are up to the task. I figured with the early peak power you described that it may be a culprit. You already identified the real cork in your exhaust system. The size,shape, and location of the collector is VERY important. Fix that one thing properly and you should see power increase everywhere. Then move to the 700 dbl, although I haven't seen a really good one yet. J.Rob
 
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