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  #21  
Old 01-09-2016, 11:06 AM
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Johnny406 Johnny406 is offline
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Quote:
Originally Posted by Skip Fix View Post
My next planned build is a 400 block, Ohio billet 4" crank(from Pontiac Dude before forged ones came online) my RAIV 614 heads.

I think for a street car they are a great compromise less tore shredding bottom end than a 455 but more than a 400.
Years ago Greg Merrick gave me a ride in their 70 LeMans. It's a RA IV headed roller cammed 428 and it was something else. A great combination.

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1978 T/A 463 Pontiac, KRE 74cc 292CFM D-ports, Lunati VooDoo, V-max lifters, TKII, ATM 850 E85 carb, TCI TH-350 race tranny, 3600 converter 3.73 12 bolt 11.63@116.68mph
1981 T/A 4-speed 406 Pontiac, Merrick ported 6X heads, Comp 270S cam, Crosswind intake 750 Street Demon, 3.42 30 spline Eaton posi street car.
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1972 LeMans 350 Pontiac
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  #22  
Old 01-09-2016, 09:03 PM
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Skip Fix Skip Fix is offline
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I've got some Pontiac journal 6.8 Crowers from Paul Spotts a few years ago for the connectors on it. Going to be a heck of a dish for the 69cc chambers to run pump gas though!

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Skip Fix
1978 Trans Am original owner 10.99 @ 124 pump gas 455 E heads, NO Bird ever!
1981 Black SE Trans Am stockish 6X 400ci, turbo 301 on a stand
1965 GTO 4 barrel 3 speed project
2004 GTO Pulse Red stock motor computer tune 13.43@103.4
1964 Impala SS 409/470ci 600 HP stroker project
1979 Camaro IAII Edelbrock head 500" 695 HP 10.33@132 3595lbs
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  #23  
Old 01-09-2016, 10:28 PM
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Overkillphil Overkillphil is offline
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I'm planning one for the GTO as I think it will be a good match with the Richmond 4+1. The lack of choices in the 4" crank category is not a good sign however.

Singleton, thanks for the info regarding the RPM forgings. Anyone else??

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  #24  
Old 01-09-2016, 11:26 PM
Singleton Singleton is offline
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RPM site lists a 4340 forged 4" stroke, 3.25 main, (with 2.20 rod journal), on sale for $429.99, (40% off).

The 3"main version is regular price, $720

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  #25  
Old 01-10-2016, 12:12 PM
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Skip Fix Skip Fix is offline
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Originally Posted by Overkillphil View Post
I'm planning one for the GTO as I think it will be a good match with the Richmond 4+1. The lack of choices in the 4" crank category is not a good sign however.

Singleton, thanks for the info regarding the RPM forgings. Anyone else??
Mine will go in the 65 GTO with a "race" straight gear Richmond 5 speed behind it also.

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Skip Fix
1978 Trans Am original owner 10.99 @ 124 pump gas 455 E heads, NO Bird ever!
1981 Black SE Trans Am stockish 6X 400ci, turbo 301 on a stand
1965 GTO 4 barrel 3 speed project
2004 GTO Pulse Red stock motor computer tune 13.43@103.4
1964 Impala SS 409/470ci 600 HP stroker project
1979 Camaro IAII Edelbrock head 500" 695 HP 10.33@132 3595lbs
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  #26  
Old 01-10-2016, 02:45 PM
Nicks67GTO Nicks67GTO is offline
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I'll be building or having built, a 4" 400 for my street/auto X car. I want to be able to run mid 11s, drive anywhere, and ring out the mill on straightaway but not have so much tq that I'm busting loose after turns. The 4" crank seems like the best choice for power/RPM comprimise.

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  #27  
Old 01-10-2016, 09:13 PM
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Skip Fix Skip Fix is offline
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Yep a 455 with any tweaking and goose it in the turns and you get some bad oversteer no matter what the tires are even sticky DOTs

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Skip Fix
1978 Trans Am original owner 10.99 @ 124 pump gas 455 E heads, NO Bird ever!
1981 Black SE Trans Am stockish 6X 400ci, turbo 301 on a stand
1965 GTO 4 barrel 3 speed project
2004 GTO Pulse Red stock motor computer tune 13.43@103.4
1964 Impala SS 409/470ci 600 HP stroker project
1979 Camaro IAII Edelbrock head 500" 695 HP 10.33@132 3595lbs
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  #28  
Old 01-18-2016, 01:47 PM
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77 TRASHCAN 77 TRASHCAN is offline
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Quote:
Originally Posted by Overkillphil View Post
I'm planning one for the GTO as I think it will be a good match with the Richmond 4+1. The lack of choices in the 4" crank category is not a good sign however.

Singleton, thanks for the info regarding the RPM forgings. Anyone else??
Not sure of others, RPM had the 428 cranks (forged)on sale most of last year for 40% off. They have specials.

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  #29  
Old 01-18-2016, 06:21 PM
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Mike Davis Mike Davis is offline
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I have been running the 4" stroke engines for years. I have tried 3.75,4.00.4.21.4.25 strokes in stock blocks.
Currently have a 4.050 stroke with a 4.180 Bore--in my experience this is the best combo to date I have run. Consistently revs 7200-7500, and has made enough power to push a 3800lb street car to 10.0xx et's with Carter AFB'S and 335CFM E-heads.

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421 CID, stock block, Wenzler Intake, 2- Carter 750 AFB's, 3.90 Gears, Full Factory Interior, Full Exhaust, Stock Suspension 3750LBS 9.77@136.99
Multiple NSCA/NMCA World Champion

66 GTO 389 3x2, 4 speed, 4.33 gear, Montero Red 33K original Miles
67 GTO 2dr Post, 428, Tri Power, 3.55 Gears
80 Trans Am Black SE Y84 W72 WS6
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