MK-I MK-II MK-III MK-IV GULF MIRAGE J-CAR LOLA
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Why not start with your first post today and become an active part of GT40s.com now! And, if you find you enjoy GT40s.com think about becoming a Forum Supporter. | | GT40 Tech - Engines/Induction/Exhaust Motors and engine related - right here! | 
02-20-07, 10:24 PM
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 #1 (permalink)
| | CarlLaFong Rookie 
Join Date: Feb 2007 Location: Wash,DC
Posts: 14
Rep Power: 2  | Best Street / Track motor
Who builds the best 427 sbf for the Superformance MK 1 that can be street driven in the Florida sun and still taken to the track for hot laps. Right now leaning towards the Keith Craft 427/585 motor. Any recommendation or thoughts would be appreciated.
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Fast cars don't make fast drivers | 
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02-20-07, 11:09 PM
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#2 (permalink)
| | llarsen Admin
Join Date: Jun 2003 Location: Raleigh, NC GT40: Sabre
Posts: 2,074
Rep Power: 29 | Re: Best Street / Track motor
It's just MHO, but it wouldn't be a 427 windsor in a Mk I. It would be a 4.125x3.25 347c.i. in a 4 bolt main, 8.2" deck, alloy block, forged or billet crank, high dollar I-beam rods, JE forged pistons w/lightest pins money can buy, internal balance and a solid roller cam w/Crower HPPO lifters. AFR 205 heads with Jesel shaft mount rockers and the best valve springs money can buy (for God's sake don't use the stock AFR springs.)
But that's just me. It's your bicycle, you've got to decide how to pump up the tires! (My wife doesn't care how the tires get pumped up, as long as she gets to ride the bike. 8-)
Lynn
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Sabre GT40/5L EFI/G50/50
Always verify parts or products discussed for your own use. | |
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02-21-07, 12:28 AM
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#3 (permalink)
| | YerDugliness Lifetime Premier Supporter
Join Date: Mar 2006 Location: near Houston TX GT40: Yellow Wix MKII
Posts: 608
Rep Power: 9 | Re: Best Street / Track motor
I'm with you, Lynn. You've just described the short block I'm working on, slowly but surely. In my case, though, I'm going to use aluminum Cleveland heads and, of course, an "adaptor" intake manifold.
Love those Clevors!!
Doug
__________________ YD,E./PNB
Retired and attempting to age disgracefully  | |
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02-21-07, 12:53 PM
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#4 (permalink)
| | Sandy Gulf GT40
Join Date: Jan 2003 Location: Los Angeles, CA GT40: RCR GT40 Gulf
Posts: 1,176
Rep Power: 18 | Re: Best Street / Track motor
Lynn -
That is pretty much the way I went, 348 with big bore, 3.255 stroke.
Sandy
__________________ RCR GT40 #11 348" Alloy SBF, 930 Box, Gulf 1075 Trim Now in the Garage, still under construction... www.gtsparkplugs.com Links to the cars | |
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02-21-07, 06:08 PM
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#5 (permalink)
| | p thompson Administrator 
Join Date: Aug 2002 Location: Milland, West S GT40: None
Posts: 2,262
|  Re: Best Street / Track motor
Quote: |
Originally Posted by llarsen It's just MHO, but it wouldn't be a 427 windsor in a Mk I. It would be a 4.125x3.25 347c.i. in a 4 bolt main, 8.2" deck, alloy block, forged or billet crank, high dollar I-beam rods, JE forged pistons w/lightest pins money can buy, internal balance and a solid roller cam w/Crower HPPO lifters. AFR 205 heads with Jesel shaft mount rockers and the best valve springs money can buy (for God's sake don't use the stock AFR springs.)
But that's just me. It's your bicycle, you've got to decide how to pump up the tires! (My wife doesn't care how the tires get pumped up, as long as she gets to ride the bike. 8-)
Lynn | Spot on Lynn - Roy Smart's GTD Mk1 was exactly that, but with much Modified TFS heads - Joe Fontana Alloy 4-bolt Clevor block - Crower Billet crank - Kinsler stacks - 1.7:1 rockers - Lunati cam - Aviad dry sump pump - Custom Ross forged Pistons - VERY nice to drive, on road or track! 
On a similar vein - anyone got opinions on the Roush 427R ?? for a 40? - 4-Bolt Dart 9.5" 351 bored/stroked to 427, 550BHP/535ft/lbs...????? I'm due to 'slot one in' shortly and possibly mate to either ZFQ or G50...
__________________ regards
Paul Thompson
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Too Many Hobbies  - Too Little Time 
Last edited by p thompson; 02-21-07 at 06:11 PM.
Reason: typo
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02-21-07, 09:20 PM
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#6 (permalink)
| | ross nicol 10 tenths 
Join Date: Dec 2002 Location: melbourne austr
Posts: 1,088
| Re: Best Street / Track motor
Hey Paul- Those """""" ROSS """" pistons must be pretty good eh!
Guess who?
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RF #025 currently racing
ZF,Motec injection
Lotus Europa S2
De Tomaso Pantera | |
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02-21-07, 09:48 PM
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#7 (permalink)
| | Pete Lifetime Premier Supporter
Join Date: Jun 2003 Location: Brisbane, Austr GT40: GT40 Australia.
Posts: 3,126
| Re: Best Street / Track motor
Quote: |
Originally Posted by ross nicol Hey Paul- Those """""" ROSS """" pistons must be pretty good eh!
Guess who? |  Just wait till you see the .....Pete....Billet crank.
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Cheers, Pete.
DRB chassis 48.
Queensland Australia. | |
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02-21-07, 10:13 PM
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#8 (permalink)
| | jac mac 10 tenths 
Join Date: Dec 2005 Location: Gore N.Z.
Posts: 1,760
Rep Power: 23 |  Re: Best Street / Track motor
Quote: |
Originally Posted by ross nicol Hey Paul- Those """""" ROSS """" pistons must be pretty good eh!
Guess who? | Bit short on the skirt for my liking!!!
Jac Mac | 
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02-21-07, 11:15 PM
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#9 (permalink)
| | 7 Tenths
Join Date: Dec 2002 GT40: USA
Posts: 771
Rep Power: 17 | Re: Best Street / Track motor
Go for RPMs and longevity in lieu of horsepower and you will never be sorry. | |
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02-22-07, 12:41 AM
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#10 (permalink)
| | PETER HILL Gold Supporter
Join Date: May 2003 Location: North Queenslan GT40: RF083
Posts: 302
Rep Power: 9 | Re: Best Street / Track motor
Quote: |
Originally Posted by jac mac Bit short on the skirt for my liking!!!
Jac Mac | I thought that those ones came with the long skirt ??
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Cheers
Peter
RF#083 | |
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02-22-07, 03:53 AM
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#11 (permalink)
| | p thompson Administrator
Join Date: Aug 2002 Location: Milland, West S GT40: None
Posts: 2,262
| Re: Best Street / Track motor
__________________ regards
Paul Thompson
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Too Many Hobbies - Too Little Time | |
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02-24-07, 09:24 PM
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#12 (permalink)
| | raven1 Gold Supporter
Join Date: Feb 2006 Location: SPRINGFIELD MO GT40: SPF MK11, SPF M
Posts: 31
Rep Power: 3 | Re: Best Street / Track motor
I have a Kieth Craft 427 side oiler in my spf and I love it and I am very happy with Kieth Craft customer service. If i was doing a mk 1 I would look at the new ford racing boss 302 just released 500 h.p. @7800.
jerry mk2 gt40p2124 | |
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