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Old 01-25-2004, 23:48   #1 (permalink)
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My first engine build.

I am rebulding a 351 clevo with a few small mods:
stock intake manifold opened out to flow like a performer,
600 holley squarebore with vac, sec
power boss cam, specs: at .050 Inlet 214 deg, 505", exh 224 deg, 535". 112 lobe centers.
tri y pacemaker extractors thru 2 1/2 in system.

could someone please tell me what kind of power this package can make?
i am stepping up from a shized 302.
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Old 01-26-2004, 00:42   #2 (permalink)
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Re: My first engine build.

Anyones guess, but after going from s stuffed 302 you will notice an improvement.
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Old 01-26-2004, 02:13   #3 (permalink)
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Re: My first engine build.

i would guesstimate around 280-300 horse at the flywheel
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Old 01-26-2004, 02:55   #4 (permalink)
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Re: My first engine build.

unless you do a mild port job on the heads & install 4V (2.19 & 1.73") valves you wont get much over 300bhp...
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Old 01-26-2004, 14:07   #5 (permalink)
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Re: My first engine build.

I have an XD Van, running a 351+.060 same cam as you, Ported 302 heads,Edelbrock performer,600 Vac Holley,C4+2100 Stall,3.23Diff,Tri-Y pacemakers and single21/2inch.
It has run 14.1@97 over the quarter with the muffler off,and will hopefully see high 13's with a 750 Vac and a bit of sorting.

I am making about 300fwhp, I'm guessing you would make near that.

Have you thought about rebuilding and running your 302 heads?
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Old 01-26-2004, 23:50   #6 (permalink)
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Re: My first engine build.

so many people are obsessed with 4v valves. not too many street cars i know spend 90% of their life doing 6000+ rpm. anyway, i read somewhere that you only need longer duration on exhaust when using 4v heads due to the poor scavenging of the exhaust port. when using 2v opens the same duration cam will do. the cam i chose is 219dur @50 and .505 lift, the low lift enables use of single springs. very noticable idle. nice middle of the road cam.
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Old 01-27-2004, 02:24   #7 (permalink)
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Re: My first engine build.

youre right on Nak,too many people screw 2vheads up by putting 4v valves into them.they don't need them.same with the 302 heads.stick with your open chambers and have them ported by someone who knows clevo heads.
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Old 01-27-2004, 03:52   #8 (permalink)
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Re: My first engine build.

I was talking to George Haddad few years ago about the same thing and those were his words...he said that without the 4V valves the clevo heads will not flow more then 300bhp...so who am I to argue with someone that build performance motors as a job
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Old 01-27-2004, 14:51   #9 (permalink)
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Re: My first engine build.

Quote:
Originally Posted by I8AHSV
I was talking to George Haddad few years ago about the same thing and those were his words...he said that without the 4V valves the clevo heads will not flow more then 300bhp...so who am I to argue with someone that build performance motors as a job

fair enough, I8AHSV, but the cam specs the guy gave us didn't suggest anything that i thought would need the 4v valves. just a nice everyday 300-320hp engine without the bad low end characteristics typical of early gt's etc.
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Old 01-27-2004, 18:58   #10 (permalink)
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Re: My first engine build.

with the specs you've given and considering all other things in the equation, I'd expect around 270-290hp at the flywheel.
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