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351C 408 Stroker

 
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c9zx
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Joined: 26 Nov 2009
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PostPosted: Wed Dec 09, 2009 4:11 pm    Post subject: 351C 408 Stroker Reply with quote

I'm building 408 Cleveland for street use in a 1972 mustang, C-6, 3.89:1 gear. With 91 octane gas, LSA 106-108, what is realistic compression ratio limit?

Thanks
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Big Dave
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Joined: 04 Dec 2005
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Location: Tampa Florida
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PostPosted: Wed Dec 09, 2009 10:47 pm    Post subject: Reply with quote

Can not help you at all on this matter; but I wanted to welcome you to the board.

Usually people play with a Windsor block when attempting this as parts are more common and that makes things cheaper (not better) as I always had a soft spot for the big port porcupine headed Cleveland motors (they seemed pleasantly familiar to me even though I never have campaigned a FORD).

Big Dave
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10sec.et
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Joined: 29 Mar 2006
Posts: 3472
Location: Houston,Texas
346624.78 points


1969 Oldsmobile Cutlass

PostPosted: Wed Dec 09, 2009 11:43 pm    Post subject: Reply with quote

im not a Ford guy either but i race with a few. its my understanding that the Ford engines dont like a lot of timing with higher compression and pump gas. we have 93 at the pump here and one of the guys i know has a SBF with a little over 10:1 compression. he runs it at 34* timing with iron heads on 93 pump gas. aluminum heads will help. and welcome to SMOKEmUP.
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af2 wrote:
It seems we can look at our magical Balls and come up with a fix?

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squeeezer
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Joined: 02 Mar 2007
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Location: new richmond WI
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1991 Chevrolet Camaro

PostPosted: Thu Dec 10, 2009 12:50 pm    Post subject: Reply with quote

what heads are ya running 2 or 4bbl??
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c9zx
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Joined: 26 Nov 2009
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PostPosted: Thu Dec 10, 2009 3:01 pm    Post subject: 351C 408 stroker Reply with quote

Heads are Iron closed chamber 4V with mild flow improvements ( mostly exhaust, 304 cfm/ 196cfm @ .600 ). Pump gas here is 91 octane, not oxygenated. I'm shooting for an effective CR of 7.9-8.2, static CR of about 9.6:1. My concern is detonation with 91 octane. Any input is appreciated.

Chuck
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squeeezer
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Joined: 02 Mar 2007
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Location: new richmond WI
191524.76 points


1991 Chevrolet Camaro

PostPosted: Thu Dec 10, 2009 11:31 pm    Post subject: Reply with quote

can you get quality aviation gas anywhere near you

cause it will be cheaper than 110 or 118 race fuel

or bleed a lil more cylinder presure with a cam change

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10sec.et
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Joined: 29 Mar 2006
Posts: 3472
Location: Houston,Texas
346624.78 points


1969 Oldsmobile Cutlass

PostPosted: Thu Dec 10, 2009 11:31 pm    Post subject: Reply with quote

personally, i think you will be fine as long as you dont get carried away with the timing. i put in a call to my machinist (Ford guy) but he didnt answer. probably thinks im calling about my Olds again Twisted Evil .
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af2 wrote:
It seems we can look at our magical Balls and come up with a fix?

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clay
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Location: South Carolina
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1972 Chevrolet Nova

PostPosted: Thu Dec 10, 2009 11:58 pm    Post subject: Reply with quote

About the only experience I can add is with a buddies Boss 302. Using basically the same head you have, it did actually like a fair amount of timing (40* as well as I can remember). I can't remember the actual compression ratio (I know that would help - sorry), but I'm almost positive it wasn't much over 10:1, if it was even that much. It did have a domed piston, but I remember it had something like 0.080" deck clearance including the gasket. Never any problems with detonation, but we do have 93 ocatane here. 9.6:1 sounds good to me. Clay
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10sec.et
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Joined: 29 Mar 2006
Posts: 3472
Location: Houston,Texas
346624.78 points


1969 Oldsmobile Cutlass

PostPosted: Sat Dec 12, 2009 3:22 am    Post subject: Reply with quote

Roger called me back today. he says that 9.5: 1 compression with 34* timing should do well on 91 octane with those heads. he also says im down to $338 on my bill Cheers I'm not worthy Cool.
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