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Author Topic:   For the cleveland engine builders!
70coupe
Gearhead

Posts: 459
From: Toronto,Ontario,Canada
Registered: Aug 2000

posted 08-24-2001 01:53 PM     Click Here to See the Profile for 70coupe     Edit/Delete Message   Reply w/Quote
I have a 351c 4 bolt main block with closed chamber heads and proper 3/8" screw in studs,one piece valves with 10 degree locks and retainers. Trw forged flat tops with around 11:1 compression. My cam is a Crane solid .554/.577 lift with 238/248 [email protected] Carb is a Holley 750dp mech secondaries on a Torker intake manifold. Good ignition system with MSD 6AL box and 2 step. Bottom end is 10/10 with arp rod bolts. Fresh C6 tranny with 8 3/4" 5000 stall converter and 9" rear with 4:11 gears and slicks. My best time with a 3375lb car with me in it is [email protected] What should my next move be to lower my ET? I know its alot of info but if I didnt put it in you'd ask! Oh ya my tires are 26"x10"x15" M/T Et drag.

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n2oMike
Gearhead

Posts: 2419
From: Spencer, WV
Registered: Jan 2001

posted 08-24-2001 02:33 PM     Click Here to See the Profile for n2oMike   Click Here to Email n2oMike     Edit/Delete Message   Reply w/Quote
Sounds like an extremely good pump gas friendly, streetable combo to me... The compression is closer to 10:1 than 11. More precisely, assuming a 64cc chamber, 9cc gasket, 2cc for 0.010" deck height, and 3cc for valve reliefs, it comes out to 10.2

Sounds like all the parts should work together really well. The converter might be a little loose for the street, but should be good for the track. If you want to optimize the gear for the track, you could probably step up to something like a 4.56... Otherwise, there are no real flaws to work on. You've done a good job on the overall combo! 12.63 is a really good N/A time for a heavier car with a pretty much (bolt-it-together) streetable combo. The combo isn't all that "high stress" and should last a long time with regular maintenance.

You didn't mention the lobe seperation angle of the cam. Clevelands like them pretty tight... Ideally, I'd go for around a 108 N/A on the street, or with a bit more compression, 104-106 for a strip-only car.

You done good, congrats!

------------------
Mike Burch
66 mustang real street
302 4-speed 289 heads
10.63 @ 129.3
http://www.geocities.com/motorcitymustang/cmml/cmml_mburch.html
http://www.fortunecity.com/silverstone/healey/367

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Hans olsson
Gearhead

Posts: 622
From: Sweden
Registered: Apr 2000

posted 08-24-2001 03:14 PM     Click Here to See the Profile for Hans olsson   Click Here to Email Hans olsson     Edit/Delete Message   Reply w/Quote
Maybe C-4 5.43 gears and ram air.(Shaker hood)? Easy .5 of a second. In my opinion. You could even use the conv if you buy a 26 spline input shaft C-4. J-W makes a splined bushing for this . Hans.

------------------

  • 71 Mach1 351c
  • E/SA 11.92-110
  • F/SA 12.04-110

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denny
Journeyman

Posts: 69
From: Northfield NH USA
Registered: Jul 2000

posted 08-24-2001 04:43 PM     Click Here to See the Profile for denny   Click Here to Email denny     Edit/Delete Message   Reply w/Quote
Here is wyhat I have 351 4bolt 4v closed chamber heads 7/16 screw in studs comp cam 246 256 571 605 solid with comp cam roller rockers.Milodon valves 2.19 1.71 . torquer 850 holey right out of the box. Ross flat top pistons just over 10:1 as Mike said. I think the ROSS pistons are worth somthing over TRW but they are expensive. MSD 7al2 4sp trans was top loader now Jerico 4.86 gear 28 x 11 slick. 3650# 73 'stang 11.74 @ 116.82. Best run with the top loader 2.32 1st gear was 11.96 @115 Jerico has 3.08 1st. I tried my highly tuned 780 vac. sec off my A/Sa 427 Fairlane and lost about .15 E.T and nearly 2 mph. I thought I would loose the mph but expected the et to be the same if not better. I guess the Clevelands like to breathe. I would try the bigger carb and then a bigger cam. Also on my Fairlane we can get a C6 to run within .04 -.05 of the c4. Somday it will be a stick though.

------------------
D French
67 427 Fairlane(A/SA) 73 Mustang 351c

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clevelandstyle
Gearhead

Posts: 1035
From: Connersville, IN
Registered: Jul 2001

posted 08-24-2001 09:16 PM     Click Here to See the Profile for clevelandstyle     Edit/Delete Message   Reply w/Quote
Hey coupe, did you notice that a couple of guys told you to put more gear in it? Clevelands like low gears and revs. I run 4.56s in '70. 1.71 60's, 12.32 @ 109 mph. I drive on the street a lot.

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70coupe
Gearhead

Posts: 459
From: Toronto,Ontario,Canada
Registered: Aug 2000

posted 08-25-2001 06:25 AM     Click Here to See the Profile for 70coupe     Edit/Delete Message   Reply w/Quote
Whats your combo clevelandstyle?

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kid vishus
Gearhead

Posts: 6098
From: middle of NC
Registered: Oct 2000

posted 08-25-2001 07:48 AM     Click Here to See the Profile for kid vishus   Click Here to Email kid vishus     Edit/Delete Message   Reply w/Quote
A C4 behind a motor like yours should be worth around .3, maybe a little more.

Also, if you can find one to borrow first, when I switched from my 750 dp to a 950HP, it picked up almost another 3 tenths.

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Mpcoluv
Gearhead

Posts: 1278
From: Charlotte NC usa
Registered: Apr 2001

posted 08-25-2001 09:05 AM     Click Here to See the Profile for Mpcoluv   Click Here to Email Mpcoluv     Edit/Delete Message   Reply w/Quote
Hey Coupe, how does that cam idle on the street?
I have the same cam in a box right now.

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70coupe
Gearhead

Posts: 459
From: Toronto,Ontario,Canada
Registered: Aug 2000

posted 08-25-2001 09:18 AM     Click Here to See the Profile for 70coupe     Edit/Delete Message   Reply w/Quote
The cam idles fine at about 700rpm. A little bit of lump to it but not bad. I had mid 12's in mind when I put the cam in. Car went [email protected] so I'm pleased. Car has power brakes and doesnt need a vacuum canister either! Has about 12hg vacuum at idle.

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clevelandstyle
Gearhead

Posts: 1035
From: Connersville, IN
Registered: Jul 2001

posted 08-25-2001 10:17 AM     Click Here to See the Profile for clevelandstyle     Edit/Delete Message   Reply w/Quote
Coupe,my combo is almost the same as yours except cam is 246/256 @ .050". Converter is 4500 in C6. Carb is 800 DP. Car weight is 3350#/driver. The cam does fine on the street, but if I were gonna change anything I would put in a bigger one. I am only shifting a 6300rpm and going through the lights at 6600 rpm. I think I should go higher, but the cam doesn't want any more. I just slow down when I shift higher. I know the heads want more.
I would recommend a bigger cam for you too.

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