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355 sbc strip/street

 
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super_chevydf
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Joined: 08 Jan 2006
Posts: 23

640.90 points



PostPosted: Mon Sep 25, 2006 10:01 pm    Post subject: 355 sbc strip/street Reply with quote

Hey is there anyone out there that has a good computer program to estimate the hp of my 355? Its got a stock crank 10/10 over. reconditioned rods stock length, has speed pro hyperutectic pistons 11 cc dish. block hasnt been decked. Has Dart iron eagle heads with 2.08 intake and 1.60 exhaust valves. Has a .555 lift cam with 108 degree centerline. and 1.5 ratio roller rockers, 750 holley mechanical advance carb, and msd streetfire distributor, and a 110gph holley fuel pump. also has dynomax ceramic coated 1 3/4 headers. wet sump motor, and mechanical high volume water pump. also has a edelbrock air gap intake. Thanks
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artinla
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Joined: 09 May 2006
Posts: 233

8558.30 points


1971 Chevrolet Nova

PostPosted: Tue Sep 26, 2006 1:41 am    Post subject: Reply with quote

Yes, but we would need a little more information about the cam, and whether any porting has been done.

Need to know your cam model # or at least the IVC point and the duration @ .050.

Art
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GrandSportC3
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Joined: 11 Jul 2003
Posts: 1231
Location: Lakeland, FL
32443.62 points


1968 Chevrolet Corvette

PostPosted: Tue Sep 26, 2006 6:40 am    Post subject: Reply with quote

sounds like a approx. 460 - 480 HP setup depending on runner size of your heads.. With 2.08 valves, I assume that you have the 230 cc intake runners - right?

I had a 383 with Dart Iron Eagle heads with 215 cc intake runners, 2.05 valves and a flat tapped solid cam with 238/248 degrees .050 duration and .525/.540 lift and 10:1 compression and the combo made 465 HP. Even though you have less cubes, you do have more compression and slightly bigger cam..
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super_chevydf
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Joined: 08 Jan 2006
Posts: 23

640.90 points



PostPosted: Tue Sep 26, 2006 4:08 pm    Post subject: Cam details Reply with quote

the cam is a ISK-201549 from isky racing cams. Duration at 050 inch Lift: 258 int./263 exh. and no porting has been done.
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af2
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Joined: 01 Sep 2003
Posts: 5558
Location: grassvalley, ca
71227.76 points


1933 Willys Coupe

PostPosted: Tue Sep 26, 2006 4:57 pm    Post subject: Reply with quote

If you are using a non decked block and FelPro or any other gasket of that nature the squish is a whopping .074! If the heads are 64cc the compression is 9.175:1 if the heads are 72cc the comp is 8.5:1. The squish has to be cut down to.040. Use a .015 gasket there are some available with good coatings. Having a .040 squish bumps the comp to 9.699:1 and the motor will be way happier burning more of the whole charge= more H.P.
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junkyarddog
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Joined: 07 Apr 2003
Posts: 88

1268.42 points


1982 Oldsmobile Cutlass

PostPosted: Wed Sep 27, 2006 9:43 am    Post subject: steup Reply with quote

I have had alnost exact same setup like your before (heads and all), mine was flat tops though. I ca tell you one thing, your heads are too big. With that big of head the incoming ait with loose lots of viloscity. Sluggish air euals less HP. Friend of mine has 383 with vortec heads (1.94 intake valve) and he has run 10.40's ('88 Camaro, full interior, cage, full exhaust). He has machine shop and use to have big Dart heads (ran them on 355 before 383). On dyno he said vortecs made 30 something more horse on 355 than Darts. Lower torque was much better also.
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Tyler Bonham
A.K.A. Junk Yard Dog
NHRA S/ST D595
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Paul P
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Joined: 15 Aug 2002
Posts: 2403
Location: Townsend, Mass.
81574.74 points


1971 Chevrolet Chevelle

PostPosted: Wed Sep 27, 2006 10:02 am    Post subject: Reply with quote

I think Adam is talking about quench height. Smile
In that article below it also refers to it as squish.

http://www.chevyhiperformance.com/techarticles/94138_piston_head_clearance_guide/
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af2
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Joined: 01 Sep 2003
Posts: 5558
Location: grassvalley, ca
71227.76 points


1933 Willys Coupe

PostPosted: Wed Sep 27, 2006 7:10 pm    Post subject: Reply with quote

Paul P wrote:
I think Adam is talking about quench height. Smile
In that article below it also refers to it as squish.

http://www.chevyhiperformance.com/techarticles/94138_piston_head_clearance_guide/


Yep. Good read, I didn't see that article before.
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